Infiniti I30. Emission Control System (2003 year). Manual

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

1. Stop engine.
2. Perform “Accelerator Pedal Released Position Learning”, EC-71.

䊳

GO TO 12.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform “Throttle Valve Closed Position Learning”, EC-71.

䊳

GO TO 13.

PERFORM IDLE AIR VOLUME LEARNING

Perform “Idle Air Volume Learning”, EC-71.
Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes

䊳

GO TO 14.

䊳

1. Follow the instruction of “Idle Air Volume Learning”.
2. GO TO 4.

CHECK TARGET IDLE SPEED AGAIN

With CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Read idle speed in “DATA MONITOR” mode with CONSULT-II.

675

50 rpm (in “P” or “N” position)

Without CONSULT-II

1. Start engine and warm it up to normal operating temperature.
2. Check idle speed.

675

50 rpm (in “P” or “N” position)

OK or NG

䊳

GO TO 15.

䊳

GO TO 17.

CHECK IGNITION TIMING AGAIN

1. Run engine at idle.
2. Check ignition timing with a timing light.

SEC004D

15°

5° BTDC (in “P” or “N” position)

OK or NG

OK (With CONSULT-II)

䊳

GO TO 19.

OK (Without CONSULT-
II)

䊳

GO TO 20.

䊳

GO TO 16.

IDX

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-65

CHECK TIMING CHAIN INSTALLATION

Check timing chain installation. Refer to EM-29, “TIMING CHAIN”.

OK or NG

䊳

GO TO 17.

䊳

1. Repair the timing chain installation.
2. GO TO 4.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Check camshaft position sensor (PHASE) and circuit. Refer to “DTC P0340, P0345 CMP SENSOR (PHASE)”, EC-317.

쐌

Check crankshaft position sensor (POS) and circuit. Refer to “DTC P0335 CKP SENSOR (POS)”, EC-310.

OK or NG

䊳

GO TO 18.

䊳

1. Repair or replace.
2. GO TO 4.

CHECK ECM FUNCTION

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare

case.)

2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to “IVIS (INFINITI

VEHICLE IMMOBILIZER SYSTEM — NATS)”, EC-90.

䊳

GO TO 4.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL

With CONSULT-II

1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. See “HO2S1 MNTR (B1)” in “DATA MONITOR” mode.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that

the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

PBIB0120E

1 time: RICH

→

LEAN

→

RICH

2 times: RICH

→

LEAN

→

RICH

→

LEAN

→

RICH

OK or NG

䊳

GO TO 21.

NG (Monitor does not
fluctuate.)

䊳

GO TO 23.

NG (Monitor fluctuates
less than 5 times.)

䊳

GO TO 30.

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-66

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) SIGNAL

Without CONSULT-II

1. Stop engine and set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to “HOW TO SWITCH

DIAGNOSTIC TEST MODE”, EC-92.

2. Start engine and run it at about 2,000 rpm for about 2 minutes under no-load.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that

the MIL comes on more than 5 times during 10 seconds.

OK or NG

䊳

GO TO 22.

NG (MIL does not come
on)

䊳

GO TO 23.

NG (MIL comes on less
than 5 times)

䊳

GO TO 30.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

With CONSULT-II

1. See “HO2S1 MNTR (B2)” in “DATA MONITOR” mode.
2. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that

the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.

PBIB0120E

1 time: RICH

→

LEAN

→

RICH

2 times: RICH

→

LEAN

→

RICH

→

LEAN

→

RICH

OK or NG

䊳

INSPECTION END

NG (Monitor does not
fluctuate.)

䊳

GO TO 24.

NG (Monitor fluctuates
less than 5 times.)

䊳

GO TO 31.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) SIGNAL

Without CONSULT-II

1. Switch the monitored sensor from bank 1 to bank 2. Refer to “How to Switch Monitored Sensor from Bank 1 to Bank 2

or Vice Versa”, EC-92.

2. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that

the MIL comes on more than 5 times during 10 seconds.

OK or NG

䊳

INSPECTION END

NG (MIL does not come
on)

䊳

GO TO 24.

NG (MIL comes on less
than 5 times)

䊳

GO TO 31.

IDX

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-67

CHECK HEATED OXYGEN SENSOR 1 (BANK 1) HARNESS

1. Turn ignition switch “OFF” and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (bank 1) harness connector.
4. Check harness continuity between ECM terminal 91 and heated oxygen sensor 1 (bank 1) terminal 1. Refer to “Wiring

Diagram”, EC-244

Continuity should exist.

5. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 25.

䊳

1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 1).
2. GO TO 4.

CHECK HEATED OXYGEN SENSOR 1 (BANK 2) HARNESS

1. Turn ignition switch “OFF” and disconnect battery ground cable.
2. Disconnect ECM harness connector.
3. Disconnect heated oxygen sensor 1 (bank 2) harness connector.
4. Check harness continuity between ECM terminal 92 and heated oxygen sensor 1 (bank 2) terminal 1. Refer to “Wiring

Diagram”, EC-245.

Continuity should exist.

5. Also check harness for short to ground and short to power.

OK or NG

䊳

GO TO 25.

䊳

1. Repair or replace harness between ECM and heated oxygen sensor 1 (bank 2).
2. GO TO 4.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

1. Reconnect ECM harness connector.
2. Perform “Accelerator pedal released position learning”, EC-71.

䊳

GO TO 26.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

Perform “Throttle Valve Closed Position Learning”, EC-71.

䊳

GO TO 27.

PERFORM IDLE AIR VOLUME LEARNING

Perform “Idle Air Volume Learning”, EC-71.
Is Idle Air Volume Learning carried out successfully?

Yes or No

Yes (With CONSULT-II)

䊳

GO TO 28.

Yes (Without CONSULT-
II)

䊳

GO TO 29.

䊳

1. Follow the instruction of “Idle Air Volume Learning”.
2. GO TO 4.

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-68

CHECK “CO” %

With CONSULT-II

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. Turn ignition switch “OFF”, wait at least 10 seconds and then turn “ON”.
3. Select “ENG COOLANT TEMP” in “ACTIVE TEST” mode.
4. Set “ENG COOLANT TEMP” to 5°C (41°F) by touching “DWN” and “Qd”.
5. Start engine and rev it (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
6. Check “CO” %.

SEF172Y

Idle CO: 0.7 - 9.9 % and engine runs smoothly.

OK or NG

䊳

GO TO 31.

䊳

GO TO 30.

CHECK “CO” %

Without CONSULT-II

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. Turn ignition switch “OFF”.
3. Disconnect engine coolant temperature sensor harness connector.
4. Connect a resistor (4.4 k

Ω

) between terminals of engine coolant temperature sensor harness connector.

5. Start engine and rev it (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed.
6. Check “CO” %.

Idle CO: 0.7 - 9.9 % and engine runs smoothly.

7. After checking “CO” %, turn ignition switch “OFF”, disconnect the resistor from the terminals of engine coolant tempera-

ture sensor harness connector, and then connect engine coolant temperature sensor harness connector to engine cool-
ant temperature sensor.

SEF982UA

OK or NG

䊳

GO TO 31.

䊳

GO TO 30.

RECONNECT HEATED OXYGEN SENSOR 1 HARNESS CONNECTOR

1. Turn ignition switch “OFF”.
2. Reconnect heated oxygen sensor 1 harness connector.

䊳

GO TO 34.

IDX

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-69

REPLACE HEATED OXYGEN SENSOR 1

1. Stop engine.
2. Replace heated oxygen sensor 1 on the malfunctioning bank.

With CONSULT-II

䊳

GO TO 32.

Without CONSULT-II

䊳

GO TO 33.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL

With CONSULT-II

1. Start engine and warm it up until engine coolant temperature indicator points to the middle of gauge.
2. See “HO2S1 MNTR (B1)/(B2)” in “DATA MONITOR” mode.
3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that

the monitor fluctuates between LEAN and RICH more than 5 times during 10 seconds.
1 time: RICH

→

LEAN

→

RICH

2 times: RICH

→

LEAN

→

RICH

→

LEAN

→

RICH

OK or NG

䊳

GO TO 4.

䊳

GO TO 34.

CHECK HEATED OXYGEN SENSOR 1 (BANK 1)/(BANK 2) SIGNAL

Without CONSULT-II

1. Set ECM to Self-diagnostic mode II (Heated oxygen sensor 1 monitor). Refer to “How to Switch Diagnostic Test Mode”,

EC-92.

2. Switch the monitored sensor to the malfunctioning bank. Refer to “How to Switch Monitored Sensor from Bank 1 to

Bank 2 or Vice Versa”, EC-92.

3. Running engine at 2,000 rpm under no-load (The engine is warmed up to normal operating temperature.), check that

the MIL comes on more than 5 times during 10 seconds.

OK or NG

䊳

GO TO 4.

䊳

GO TO 34.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Check mass air flow sensor and its circuit, and repair or replace if necessary. Refer to EC-191.

쐌

Check injector and its circuit, and repair or replace if necessary. Refer to EC-688.

쐌

Check engine coolant temperature sensor and its circuit, and repair or replace if necessary. Refer to EC-203.

쐌

Check fuel pressure and repair or replace if necessary. Refer to EC-56.

OK or NG

䊳

GO TO 36.

䊳

1. Repair or replace.
2. GO TO 35.

ERASE UNNECESSARY DTC

After this inspection, unnecessary DTC might be displayed.
Erase the stored memory in ECM and TCM. Refer to “How to Erase Emission-related Diagnostic Information”, EC-89 and
AT-39.

䊳

GO TO 4.

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-70

CHECK ECM FUNCTION

1. Substitute another known-good ECM to check ECM function. (ECM may be the cause of an incident, but this is a rare

case.)

2. Perform initialization of IVIS (NATS) system and registration of all IVIS (NATS) ignition key IDs. Refer to “IVIS (INFINITI

VEHICLE IMMOBILIZER SYSTEM — NATS”, EC-90.

䊳

GO TO 4.

Accelerator Pedal Released Position Learning

NHEC1186

DESCRIPTION

NHEC1186S01

“Accelerator Pedal Released Position Learning” is an operation to learn the fully released position of the
accelerator pedal by monitoring the accelerator pedal position sensor output signal. It must be performed each
time harness connector of accelerator pedal position sensor or ECM is disconnected.

OPERATION PROCEDURE

NHEC1186S02

1. Make sure that accelerator pedal is fully released.
2. Turn ignition switch “ON” and wait at least 2 seconds.
3. Turn ignition switch “OFF” wait at least 10 seconds.
4. Turn ignition switch “ON” and wait at least 2 seconds.
5. Turn ignition switch “OFF” wait at least 10 seconds.

Throttle Valve Closed Position Learning

NHEC1187

DESCRIPTION

NHEC1187S01

“Throttle Valve Closed Position Learning” is an operation to learn the fully closed position of the throttle valve
by monitorizing the throttle position sensor output signal. It must be performed each time harness connector
of electric throttle control actuator or ECM is disconnected.

OPERATION PROCEDURE

NHEC1187S02

1. Turn ignition switch “ON”.
2. Turn ignition switch “OFF” wait at least 10 seconds.

Make sure that throttle valve moves during above 10 seconds by confirming the operating sound.

Idle Air Volume Learning

NHEC1188

DESCRIPTION

NHEC1188S01

“Idle Air Volume Learning” is an operation to learn the idle air vol-
ume that keeps each engine within the specific range. It must be
performed under any of the following conditions:

쐌

Each time electric throttle control actuator or ECM is replaced.

쐌

Idle speed or ignition timing is out of specification.

PREPARATION

NHEC1188S02

Before performing “Idle Air Volume Learning”, make sure that all of
the following conditions are satisfied.
Learning will be cancelled if any of the following conditions are
missed for even a moment.

쐌

Battery voltage: More than 12.9V (At idle)

쐌

Engine coolant temperature: 70 - 99°C (158 - 210°F)

쐌

PNP switch: ON

쐌

Electric load switch: OFF
(Air conditioner, headlamp, rear window defogger)
On vehicles equipped with daytime light systems, if the
parking brake is applied before the engine is started, the
headlamp will not be illuminated.

쐌

Steering wheel: Neutral (Straight-ahead position)

IDX

BASIC SERVICE PROCEDURE

Idle Speed/Ignition Timing/Idle Mixture Ratio Adjustment (Cont’d)

EC-71

쐌

Vehicle speed: Stopped

쐌

Transmission: Warmed-up
For models with CONSULT-II, drive vehicle until “FLUID TEMP
SE” in “DATA MONITOR” mode of “A/T” system indicates less
than 0.9V.
For models without CONSULT-II, drive vehicle for 10 minutes.

OPERATION PROCEDURE

NHEC1188S03

With CONSULT-II

NHEC1188S0301

NOTE:
Before perform “Idle Air Volume Learning”, make sure that “Accel-
erator Pedal Released Position Learning” and “Throttle Valve
Closed Position Learning” are completed.
If not, perform “Accelerator Pedal Released Position Learning”,
EC-71 and “Throttle Valve Closed Position Learning”, EC-71.
1.

Start engine and warm it up to normal operating temperature.

Check that all items listed under the topic “PREPARATION”
(previously mentioned) are in good order.

SEF217Z

Select “IDLE AIR VOL LEARN” in “WORK SUPPORT” mode.

SEF454Y

Touch “START” and wait 20 seconds.

MBIB0238E

Make sure that “CMPLT” is displayed on CONSULT-II screen.
If “CMPLT” is not displayed, “Idle Air Volume Learning” will not
be carried out successfully. In this case, find the cause of the
incident by referring to the “Diagnostic Procedure” below.

Rev up the engine two or three times and make sure that idle
speed and ignition timing are within the specifications.

ITEM

SPECIFICATION

Idle speed

675

50 rpm (in “P” or “N” position)

Ignition timing

5° BTDC (in “P” or “N” position)

BASIC SERVICE PROCEDURE

Idle Air Volume Learning (Cont’d)

EC-72

Without CONSULT-II

NHEC1188S0302

NOTE:

쐌

It is better to count the time accurately with a clock.

쐌

It is impossible to switch the diagnostic mode when an
accelerator pedal position sensor circuit has a malfunc-
tion.

Start engine and warm it up to normal operating temperature.

Check that all items listed under the topic “PREPARATION”
(previously mentioned) are in good order.

Turn ignition switch “OFF” and wait at least 10 seconds.

Confirm that accelerator pedal is fully released, turn ignition
switch “ON” and wait 3 seconds.

Repeat the following procedure quickly five times within 5 sec-
onds.

Fully depress the accelerator pedal.

Fully release the accelerator pedal.

Wait 7 seconds, fully depress the accelerator pedal and keep
it for approx. 20 seconds until the MIL stops blinking and turns
ON.

Fully release the accelerator pedal within 3 seconds after the
MIL turns ON.

Start engine and let it idle.

Wait 20 seconds.

SEC897C

10. Rev up the engine two or three times and make sure that idle

speed and ignition timing are within the specifications.

ITEM

SPECIFICATION

Idle speed

675

50 rpm (in “P” or “N” position)

Ignition timing

5° BTDC (in “P” or “N” position)

11. If idle speed and ignition timing are not within the specification,

“Idle Air Volume Learning” will not be carried out successfully.
In this case, find the cause of the incident by referring to the
“Diagnostic Procedure” below.

DIAGNOSTIC PROCEDURE

NHEC1188S04

If idle air volume learning cannot be performed successfully,
proceed as follows:
1.

Check that throttle valve is fully closed.

IDX

BASIC SERVICE PROCEDURE

Idle Air Volume Learning (Cont’d)

EC-73

Introduction

NHEC1423

The ECM has an on board diagnostic system, which detects malfunctions related to engine sensors or actua-
tors. The ECM also records various emission-related diagnostic information including:

Emission-related diagnostic information

SAE Mode

Diagnostic Trouble Code (DTC)

Mode 3 of SAE J1979

Freeze Frame data

Mode 2 of SAE J1979

System Readiness Test (SRT) code

Mode 1 of SAE J1979

1st Trip Diagnostic Trouble Code (1st Trip DTC)

Mode 7 of SAE J1979

1st Trip Freeze Frame data

Test values and Test limits

Mode 6 of SAE J1979

Calibration ID

Mode 9 of SAE J1979

The above information can be checked using procedures listed in the table below.

X: Applicable

—: Not applicable

DTC

1st trip DTC

Freeze Frame

data

1st trip Freeze

Frame data

SRT code

Test value

CONSULT-II

—

GST

X*1

—

ECM

X*2

—

*1: 1st trip DTCs for self-diagnoses concerning SRT items cannot be shown on the GST display.
*2: When DTC and 1st trip DTC simultaneously appear on the display, they cannot be clearly distinguished from each other.

The malfunction indicator lamp (MIL) on the instrument panel lights up when the same malfunction is detected
in two consecutive trips (Two trip detection logic), or when the ECM enters fail-safe mode. (Refer to EC-125.)

Two Trip Detection Logic

NHEC1424

When a malfunction is detected for the first time, 1st trip DTC and 1st trip Freeze Frame data are stored in
the ECM memory. The MIL will not light up at this stage. <1st trip>
If the same malfunction is detected again during the next drive, the DTC and Freeze Frame data are stored
in the ECM memory, and the MIL lights up. The MIL lights up at the same time when the DTC is stored. <2nd
trip> The “trip” in the “Two Trip Detection Logic” means a driving mode in which self-diagnosis is performed
during vehicle operation. Specific on board diagnostic items will cause the ECM to light up or blink the MIL,
and store DTC and Freeze Frame data, even in the 1st trip, as shown below.

X: Applicable

—: Not applicable

Items

MIL

DTC

1st trip DTC

1st trip

2nd trip

1st trip

displaying

2nd trip

displaying

1st trip

displaying

2nd trip

displaying

Blinking

Lighting up

Blinking

Lighting

Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0306
is being detected

—

Misfire (Possible three way catalyst
damage) — DTC: P0300 - P0306
is being detected

—

One trip detection diagnoses
(Refer to EC-9)

—

Except above

—

IDX

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Introduction

EC-75

Emission-related Diagnostic Information

NHEC0031

DTC AND 1ST TRIP DTC

NHEC0031S01

The 1st trip DTC (whose number is the same as the DTC number) is displayed for the latest self-diagnostic
result obtained. If the ECM memory was cleared previously, and the 1st trip DTC did not reoccur, the 1st trip
DTC will not be displayed.
If a malfunction is detected during the 1st trip, the 1st trip DTC is stored in the ECM memory. The MIL will not
light up (two trip detection logic). If the same malfunction is not detected in the 2nd trip (meeting the required
driving pattern), the 1st trip DTC is cleared from the ECM memory. If the same malfunction is detected in the
2nd trip, both the 1st trip DTC and DTC are stored in the ECM memory and the MIL lights up. In other words,
the DTC is stored in the ECM memory and the MIL lights up when the same malfunction occurs in two con-
secutive trips. If a 1st trip DTC is stored and a non-diagnostic operation is performed between the 1st and
2nd trips, only the 1st trip DTC will continue to be stored. For malfunctions that blink or light up the MIL dur-
ing the 1st trip, the DTC and 1st trip DTC are stored in the ECM memory.
Procedures for clearing the DTC and the 1st trip DTC from the ECM memory are described in “HOW TO
ERASE EMISSION-RELATED DIAGNOSTIC INFORMATION”, EC-89.
For malfunctions in which 1st trip DTCs are displayed, refer to EC-85. These items are required by legal
regulations to continuously monitor the system/component. In addition, the items monitored non-continuously
are also displayed on CONSULT-II.
1st trip DTC is specified in Mode 7 of SAE J1979. 1st trip DTC detection occurs without lighting up the MIL
and therefore does not warn the driver of a malfunction. However, 1st trip DTC detection will not prevent the
vehicle from being tested, for example during Inspection/Maintenance (I/M) tests.
When a 1st trip DTC is detected, check, print out or write down and erase (1st trip) DTC and Freeze Frame
data as specified in “Work Flow” procedure Step II, refer to EC-117. Then perform “DTC Confirmation Proce-
dure” or “Overall Function Check” to try to duplicate the malfunction. If the malfunction is duplicated, the item
requires repair.

How to Read DTC and 1st Trip DTC

NHEC0031S0101

DTC and 1st trip DTC can be read by the following methods.

With CONSULT-II
With GST

CONSULT-II or GST (Generic Scan Tool) Examples: P0117, P0340, P1065, etc.
These DTCs are prescribed by SAE J2012.
(CONSULT-II also displays the malfunctioning component or system.)

NO TOOLS

The number of blinks of the MIL in the Diagnostic Test Mode II (Self-Diagnostic Results) indicates the DTC.
Example: 0117, 0340, 1065, etc.

쐌

1st trip DTC No. is the same as DTC No.

쐌

Output of a DTC indicates a malfunction. However, GST or the Diagnostic Test Mode II does not
indicate whether the malfunction is still occurring or has occurred in the past and has returned to
normal. CONSULT-II can identify malfunction status as shown below. Therefore, using CONSULT-II
(if available) is recommended.

A sample of CONSULT-II display for DTC and 1st trip DTC is shown below. DTC or 1st trip DTC of a malfunc-
tion is displayed in SELF-DIAGNOSTIC RESULTS mode of CONSULT-II. Time data indicates how many times
the vehicle was driven after the last detection of a DTC.
If the DTC is being detected currently, the time data will be “0”.
If a 1st trip DTC is stored in the ECM, the time data will be “[1t]”.

PBIB0911E

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Emission-related Diagnostic Information

EC-76

FREEZE FRAME DATA AND 1ST TRIP FREEZE FRAME DATA

NHEC0031S02

The ECM records the driving conditions such as fuel system status, calculated load value, engine coolant
temperature, short term fuel trim, long term fuel trim, engine speed, vehicle speed and absolute pressure at
the moment a malfunction is detected.
Data which are stored in the ECM memory, along with the 1st trip DTC, are called 1st trip freeze frame data.
The data, stored together with the DTC data, are called freeze frame data and displayed on CONSULT-II or
GST. The 1st trip freeze frame data can only be displayed on the CONSULT-II screen, not on the GST. For
details, see EC-103.
Only one set of freeze frame data (either 1st trip freeze frame data or freeze frame data) can be stored in the
ECM. 1st trip freeze frame data is stored in the ECM memory along with the 1st trip DTC. There is no prior-
ity for 1st trip freeze frame data and it is updated each time a different 1st trip DTC is detected. However, once
freeze frame data (2nd trip detection/MIL on) is stored in the ECM memory, 1st trip freeze frame data is no
longer stored. Remember, only one set of freeze frame data can be stored in the ECM. The ECM has the fol-
lowing priorities to update the data.

Priority

Items

Freeze frame data

Misfire — DTC: P0300 - P0306
Fuel Injection System Function — DTC: P0171, P0172, P0174, P0175

Except the above items (Includes A/T related items)

1st trip freeze frame data

For example, the EGR malfunction (Priority: 2) was detected and the freeze frame data was stored in the 2nd
trip. After that when the misfire (Priority: 1) is detected in another trip, the freeze frame data will be updated
from the EGR malfunction to the misfire. The 1st trip freeze frame data is updated each time a different mal-
function is detected. There is no priority for 1st trip freeze frame data. However, once freeze frame data is
stored in the ECM memory, 1st trip freeze data is no longer stored (because only one freeze frame data or
1st trip freeze frame data can be stored in the ECM). If freeze frame data is stored in the ECM memory and
freeze frame data with the same priority occurs later, the first (original) freeze frame data remains unchanged
in the ECM memory.
Both 1st trip freeze frame data and freeze frame data (along with the DTCs) are cleared when the ECM
memory is erased. Procedures for clearing the ECM memory are described in “HOW TO ERASE EMISSION-
RELATED DIAGNOSTIC INFORMATION”, EC-89.

SYSTEM READINESS TEST (SRT) CODE

NHEC0031S03

System Readiness Test (SRT) code is specified in Mode 1 of SAE J1979.
As part of an enhanced emissions test for Inspection & Maintenance (I/M), certain states require the status of
SRT be used to indicate whether the ECM has completed self-diagnosis of major emission systems and com-
ponents. Completion must be verified in order for the emissions inspection to proceed.
If a vehicle is rejected for a State emissions inspection due to one or more SRT items indicating “INCMP”,
use the information in this Service Manual to set the SRT to “CMPLT”.
In most cases the ECM will automatically complete its self-diagnosis cycle during normal usage, and the SRT
status will indicate “CMPLT” for each application system. Once set as “CMPLT”, the SRT status remains
“CMPLT” until the self-diagnosis memory is erased.
Occasionally, certain portions of the self-diagnostic test may not be completed as a result of the customer’s
normal driving pattern; the SRT will indicate “INCMP” for these items.
NOTE:
The SRT will also indicate “INCMP” if the self-diagnosis memory is erased for any reason or if the ECM
memory power supply is interrupted for several hours.
If, during the state emissions inspection, the SRT indicates “CMPLT” for all test items, the inspector will con-
tinue with the emissions test. However, if the SRT indicates “INCMP” for one or more of the SRT items the
vehicle is returned to the customer untested.
NOTE:
If MIL is “ON” during the state emissions inspection, the vehicle is also returned to the customer untested even
though the SRT indicates “CMPLT” for all test items. Therefore, it is important to check SRT (“CMPLT”) and
DTC (No DTCs) before the inspection.

IDX

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Emission-related Diagnostic Information (Cont’d)

EC-77

SRT Item

=NHEC0031S0310

The table below shows required self-diagnostic items to set the SRT to “CMPLT”.

SRT item

(CONSULT-II indica-

tion)

Perfor-

mance Pri-

ority*

Required self-diagnostic items to set the SRT to “CMPLT”

Corresponding

DTC No.

CATALYST

Three way catalyst function

P0420, P0430

EVAP SYSTEM

EVAP control system

P0442

EVAP control system

P0456, P1456

EVAP control system purge flow monitoring

P0441

HO2S

Heated oxygen sensor 1

P0132, P0152

Heated oxygen sensor 1

P0133, P0153

Heated oxygen sensor 1

P0134, P0154

Heated oxygen sensor 1

P1143, P1163

Heated oxygen sensor 1

P1144, P1164

Heated oxygen sensor 2

P0138, P0158

Heated oxygen sensor 2

P0139, P0159

Heated oxygen sensor 2

P1146, P1166

Heated oxygen sensor 2

P1147, P1167

HO2S HTR

Heated oxygen sensor 1 heater

P0031, P0032, P0051,
P0052

Heated oxygen sensor 2 heater

P0037, P0038, P0057,
P0058

*: If completion of several SRTs is required, perform driving patterns (DTC confirmation procedure), one by one based on the priority
for models with CONSULT-II.

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Emission-related Diagnostic Information (Cont’d)

EC-78

SRT Set Timing

=NHEC0031S0311

SRT is set as “CMPLT” after self-diagnosis has been performed one or more times. Completion of SRT is done
regardless of whether the result is OK or NG. The set timing is different between OK and NG results and is
shown in the table below.

Self-diagnosis result

Example

Diagnosis

Ignition cycle

OFF

All OK

Case 1

P0400

OK (1)

— (1)

OK (2)

— (2)

P0402

OK (1)

— (1)

OK (2)

P1402

OK (1)

OK (2)

— (2)

SRT of EGR

“CMPLT”

Case 2

P0400

OK (1)

— (1)

P0402

— (0)

OK (1)

— (1)

P1402

OK (1)

OK (2)

— (2)

SRT of EGR

“INCMP”

“CMPLT”

NG exists

Case 3

P0400

—

P0402

—

P1402

—

(Consecutive NG)

(1st trip)

DTC

1st trip DTC

—

1st trip DTC

DTC

(= MIL “ON”)

SRT of EGR

“INCMP”

“CMPLT”

OK: Self-diagnosis is carried out and the result is OK.
NG: Self-diagnosis is carried out and the result is NG.
—: Self-diagnosis is not carried out.

When all SRT related self-diagnoses showed OK results in a single cycle (Ignition OFF-ON-OFF), the SRT
will indicate “CMPLT”.

Case 1 above

When all SRT related self-diagnoses showed OK results through several different cycles, the SRT will indi-
cate “CMPLT” at the time the respective self-diagnoses have at least one OK result.

Case 2 above

If one or more SRT related self-diagnoses showed NG results in 2 consecutive cycles, the SRT will also indi-
cate “CMPLT”.

Case 3 above

The table above shows that the minimum number of cycles for setting SRT as “INCMP” is one (1) for each
self-diagnosis (Case 1 & 2) or two (2) for one of self-diagnoses (Case 3). However, in preparation for the state
emissions inspection, it is unnecessary of each self-diagnosis to be executed twice (Case 3) for the following
reasons:

쐌

The SRT will indicate “CMPLT” at the time the respective self-diagnoses have one (1) OK result.

쐌

The emissions inspection requires “CMPLT” of the SRT only with OK self-diagnosis results.

쐌

When, during SRT driving pattern, 1st trip DTC (NG) is detected prior to “CMPLT” of SRT, the self-diag-
nosis memory must be erased from ECM after repair.

쐌

If the 1st trip DTC is erased, all the SRT will indicate “INCMP”.

NOTE:
SRT can be set as “CMPLT” together with the DTC(s). Therefore, DTC check must always be carried out prior
to the state emission inspection even though the SRT indicates “CMPLT”.

SRT Service Procedure

NHEC0031S0312

If a vehicle has failed the state emissions inspection due to one or more SRT items indicating “INCMP”, review
the flowchart diagnostic sequence on the next page.

IDX

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Emission-related Diagnostic Information (Cont’d)

EC-79

Infiniti I30. Emission Control System (2003 year). Manual - part 5