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

SEF139P

Generic Scan Tool (GST)

=NHEC0035

DESCRIPTION

NHEC0035S01

Generic Scan Tool (OBDII scan tool) complying with SAE J1978
has 8 different functions explained on the next page.
ISO9141 is used as the protocol.
The name “GST” or “Generic Scan Tool” is used in this service
manual.

SEF289X

INSPECTION PROCEDURE

NHEC0035S02

Turn ignition switch OFF.

Connect GST to data link connector, which is located under LH
dash panel near the fuse box cover.

SEF398S

Turn ignition switch ON.

Enter the program according to instruction on the screen or in
the operation manual.

(*: Regarding GST screens in this section, sample screens are
shown.)

SEF416S

Perform each diagnostic mode according to each service pro-
cedure.

For further information, see the GST Operation Manual of the
tool maker.

IDX

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Generic Scan Tool (GST)

EC-113

FUNCTION

NHEC0035S03

Diagnostic test mode

Function

MODE 1

READINESS TESTS

This mode gains access to current emission-related data values, including analog
inputs and outputs, digital inputs and outputs, and system status information.

MODE 2

(FREEZE DATA)

This mode gains access to emission-related data value which were stored by ECM
during the freeze frame. [For details, refer to “Freeze Frame Data” (EC-103).]

MODE 3

DTCs

This mode gains access to emission-related power train trouble codes which were
stored by ECM.

MODE 4

CLEAR DIAG INFO

This mode can clear all emission-related diagnostic information. This includes:

쐌

Clear number of diagnostic trouble codes (MODE 1)

쐌

Clear diagnostic trouble codes (MODE 3)

쐌

Clear trouble code for freeze frame data (MODE 1)

쐌

Clear freeze frame data (MODE 2)

쐌

Reset status of system monitoring test (MODE 1)

쐌

Clear on board monitoring test results (MODE 6 and 7)

MODE 6

(ON BOARD TESTS)

This mode accesses the results of on board diagnostic monitoring tests of specific
components/systems that are not continuously monitored.

MODE 7

(ON BOARD TESTS)

This mode enables the off board test drive to obtain test results for emission-related
powertrain components/systems that are continuously monitored during normal driving
conditions.

MODE 8

—

This mode can close EVAP system in ignition switch “ON” position (Engine stopped).
When this mode is performed, the following parts can be opened or closed.

쐌

EVAP canister vent control valve open

쐌

Vacuum cut valve bypass valve closed

In the following conditions, this mode cannot function.

쐌

Low ambient temperature

쐌

Low battery voltage

쐌

Engine running

쐌

Ignition switch “OFF”

쐌

Low fuel temperature

쐌

Too much pressure is applied to EVAP system

MODE 9

(CALIBRATION ID)

This mode enables the off-board test device to request specific vehicle information
such as Vehicle Identification Number (VIN) and Calibration IDs.

ON BOARD DIAGNOSTIC SYSTEM DESCRIPTION

Generic Scan Tool (GST) (Cont’d)

EC-114

MEF036D

Introduction

NHEC0036

SEF233G

SEF234G

The engine has an ECM to control major systems such as fuel
control, ignition control, idle air control system, etc. The ECM
accepts input signals from sensors and instantly drives actuators.
It is essential that both input and output signals are proper and
stable. At the same time, it is important that there are no malfunc-
tions such as vacuum leaks, fouled spark plugs, or other malfunc-
tions with the engine.
It is much more difficult to diagnose an incident that occurs inter-
mittently rather than continuously. Most intermittent incidents are
caused by poor electric connections or improper wiring. In this
case, careful checking of suspected circuits may help prevent the
replacement of good parts.
A visual check only may not find the cause of the incidents. A road
test with CONSULT-II (or GST) or a circuit tester connected should
be performed. Follow the “Work Flow” on EC-117.
Before undertaking actual checks, take a few minutes to talk with
a customer who approaches with a driveability complaint. The cus-
tomer can supply good information about such incidents, especially
intermittent ones. Find out what symptoms are present and under
what conditions they occur. A “Diagnostic Worksheet” like the
example on next page should be used.
Start your diagnosis by looking for “conventional” malfunctions first.
This will help troubleshoot driveability malfunctions on an electroni-
cally controlled engine vehicle.

SEF907L

DIAGNOSTIC WORKSHEET

NHEC0036S01

There are many operating conditions that lead to the malfunction
of engine components. A good grasp of such conditions can make
trouble-shooting faster and more accurate.
In general, each customer feels differently about an incident. It is
important to fully understand the symptoms or conditions for a
customer complaint.
Utilize a diagnostic worksheet like the one on the next page in order
to organize all the information for troubleshooting.
Some conditions may cause the MIL to come on steady or blink and
DTC to be detected. Examples:

쐌

Vehicle ran out of fuel, which caused the engine to misfire.

쐌

Fuel filler cap was left off or incorrectly screwed on, allowing
fuel to evaporate into the atmosphere.

IDX

TROUBLE DIAGNOSIS — INTRODUCTION

Introduction

EC-115

Work Flow

NHEC0037

SEF510ZF

EC-125

If time data of “SELF-DIAG
RESULTS” is other than “0” or
“[1t]”, perform “TROUBLE DIAG-
NOSIS FOR INTERMITTENT
INCIDENT”, EC-151.

If the incident cannot be verified,
perform “TROUBLE DIAGNOSIS
FOR INTERMITTENT INCIDENT”,
EC-151.

If the on board diagnostic system
cannot be performed, check main
power supply and ground circuit.
Refer to “TROUBLE DIAGNOSIS
FOR POWER SUPPLY”, EC-152.

If malfunctioning part cannot be

detected, perform “TROUBLE
DIAGNOSIS FOR INTERMIT-
TENT INCIDENT”, EC-151.

EC-82

EC-147

IDX

TROUBLE DIAGNOSIS — INTRODUCTION

Work Flow

EC-117

DESCRIPTION FOR WORK FLOW

NHEC0037S01

STEP

DESCRIPTION

STEP I

Get detailed information about the conditions and the environment when the incident/symptom occurred using
the “DIAGNOSTIC WORK SHEET”, EC-116.

STEP II

Before confirming the concern, check and write down (print out using CONSULT-II or GST) the (1st trip) DTC
and the (1st trip) freeze frame data, then erase the DTC and the data. (Refer to EC-89.) The (1st trip) DTC and
the (1st trip) freeze frame data can be used when duplicating the incident at STEP III & IV.
If the incident cannot be verified, perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.
Study the relationship between the cause, specified by (1st trip) DTC, and the symptom described by the cus-
tomer. (The “Symptom Matrix Chart” will be useful. See EC-126.)
Also check related service bulletins for information.

STEP III

Try to confirm the symptom and under what conditions the incident occurs.
The “DIAGNOSTIC WORK SHEET” and the freeze frame data are useful to verify the incident. Connect CON-
SULT-II to the vehicle in DATA MONITOR (AUTO TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.
If the malfunction code is detected, skip STEP IV and perform STEP V.

STEP IV

Try to detect the (1st trip) DTC by driving in (or performing) the “DTC Confirmation Procedure”. Check and read
the (1st trip) DTC and (1st trip) freeze frame data by using CONSULT-II or GST.
During the (1st trip) DTC verification, be sure to connect CONSULT-II to the vehicle in DATA MONITOR (AUTO
TRIG) mode and check real time diagnosis results.
If the incident cannot be verified, perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.
In case the “DTC Confirmation Procedure” is not available, perform the “Overall Function Check” instead. The
(1st trip) DTC cannot be displayed by this check, however, this simplified “check” is an effective alternative.
The “NG” result of the “Overall Function Check” is the same as the (1st trip) DTC detection.

STEP V

Take the appropriate action based on the results of STEP I through IV.
If the malfunction code is indicated, proceed to TROUBLE DIAGNOSIS FOR DTC PXXXX.
If the normal code is indicated, proceed to the BASIC INSPECTION. (Refer to EC-119.) If CONSULT-II is
available, perform “DATA MONITOR (SPEC)” mode with CONSULT-II and proceed to the “TROUBLE DIAGNO-
SIS — SPECIFICATION VALUE”, EC-147. (If malfunction is detected, proceed to “REPAIR REPLACE”.) Then
perform inspections according to the Symptom Matrix Chart. (Refer to EC-126.)

STEP VI

Identify where to begin diagnosis based on the relationship study between symptom and possible causes.
Inspect the system for mechanical binding, loose connectors or wiring damage using (tracing) “Harness Layouts”.
Gently shake the related connectors, components or wiring harness with CONSULT-II set in “DATA MONITOR
(AUTO TRIG)” mode.
Check the voltage of the related ECM terminals or monitor the output data from the related sensors with CON-
SULT-II. Refer to EC-130, 136.
The “Diagnostic Procedure” in EC section contains a description based on open circuit inspection. A short circuit
inspection is also required for the circuit check in the Diagnostic Procedure. For details, refer to GI-22, “Circuit
Inspection”.
Repair or replace the malfunction parts.
If malfunctioning part cannot be detected, perform “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”,
EC-151.

STEP VII

Once you have repaired the circuit or replaced a component, you need to run the engine in the same conditions
and circumstances which resulted in the customer’s initial complaint.
Perform the “DTC Confirmation Procedure” and confirm the normal code [DTC No. P0000] is detected. If the
incident is still detected in the final check, perform STEP VI by using a different method from the previous one.
Before returning the vehicle to the customer, be sure to erase the unnecessary (already fixed) (1st trip) DTC in
ECM and TCM (Transmission control module). (Refer to EC-89.)

TROUBLE DIAGNOSIS — INTRODUCTION

Work Flow (Cont’d)

EC-118

Basic Inspection

NHEC0038

Precaution:
Perform Basic Inspection without electrical or mechanical
loads applied;

쐌

Headlamp switch is OFF,

쐌

Air conditioner switch is OFF,

쐌

Rear window defogger switch is OFF,

쐌

Steering wheel is in the straight-ahead position, etc.

INSPECTION START

1. Check service records for any recent repairs that may indicate a related malfunction, or a current need for scheduled

maintenance.

2. Open engine hood and check the following:

쐌

Harness connectors for improper connections

쐌

Vacuum hoses for splits, kinks and improper connections

쐌

Wiring for improper connections, pinches and cuts

쐌

Air cleaner clogging

쐌

Hoses and ducts for leaks

SEF983U

䊳

GO TO 2.

REPAIR OR REPLACE

Repair or replace components as necessary according to corresponding “Diagnostic Procedure”.

䊳

GO TO 3.

IDX

TROUBLE DIAGNOSIS — BASIC INSPECTION

Basic Inspection

EC-119

CHECK TARGET IDLE SPEED

With CONSULT-II

1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed for about 1 minute.

SEF978U

3. Read idle speed in “DATA MONITOR” mode with CONSULT-II.

675

50 rpm (in “P” or “N” position)

SEF058Y

Without CONSULT-II

1. Run engine at about 2,000 rpm for about 2 minutes under no-load.
2. Rev engine (2,000 to 3,000 rpm) two or three times under no-load, then run engine at idle speed for about 1 minute.
3. Check idle speed.

675

50 rpm (in “P” or “N” position)

OK or NG

䊳

GO TO 10.

䊳

GO TO 4.

PERFORM ACCELERATOR PEDAL RELEASED POSITION LEARNING

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

䊳

GO TO 5.

PERFORM THROTTLE VALVE CLOSED POSITION LEARNING

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

䊳

GO TO 6.

TROUBLE DIAGNOSIS — BASIC INSPECTION

Basic Inspection (Cont’d)

EC-120

PERFORM IDLE AIR VOLUME LEARNING

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

Yes or No

Yes

䊳

GO TO 7.

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 10.

䊳

GO TO 8.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Check camshaft position sensor (PHASE) and circuit. Refer to EC-317.

쐌

Check crankshaft position sensor (POS) and circuit. Refer to EC-310.

OK or NG

䊳

GO TO 9.

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 a malfunction, 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.

IDX

TROUBLE DIAGNOSIS — BASIC INSPECTION

Basic Inspection (Cont’d)

EC-121

CHECK IGNITION TIMING

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

䊳

INSPECTION END

䊳

GO TO 11.

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

Refer to “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.

TROUBLE DIAGNOSIS — BASIC INSPECTION

Basic Inspection (Cont’d)

EC-122

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

䊳

INSPECTION END

䊳

GO TO 16.

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 EC-317.

쐌

Check crankshaft position sensor (POS) and circuit. Refer to 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 a malfunction, 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.

IDX

TROUBLE DIAGNOSIS — BASIC INSPECTION

Basic Inspection (Cont’d)

EC-123

DTC Inspection Priority Chart

NHEC0039

If some DTCs are displayed at the same time, perform inspections one by one based on the following prior-
ity chart.

Priority

Detected items (DTC)

쐌

U1000, U1001 CAN communication line

쐌

P0101, P0102, P0103, P1102 MAF sensor

쐌

P0112, P0113, P0127 IAT sensor

쐌

P0117, P0118, P0125 ECT sensor

쐌

P0122, P0123, P0222, P0223, P1225, P1226, P1229, P2135 Throttle position sensor

쐌

P0128 Thermostat function

쐌

P0181, P0182, P0183 FTT sensor

쐌

P0327, P0328 KS

쐌

P0335 CKP sensor (POS)

쐌

P0340, P0345 CMP sensor (PHASE)

쐌

P0460, P0461, P0462, P0463, P1464 Fuel level sensor

쐌

P0500 VSS

쐌

P0605 ECM

쐌

P0705 Park/Neutral position switch

쐌

P1706 PNP switch

쐌

P2122, P2123, P2127, P2128, P2138 Accelerator pedal position sensor

쐌

P0031, P0032, P0051, P0052 HO2S1 heater

쐌

P0037, P0038, P0057, P0058 HO2S2 heater

쐌

P0107, P0108 Absolute pressure sensor

쐌

P0132-P0134, P1143, P1144 and P0152-P0154, P1163, P1164 HO2S1

쐌

P0138, P0139, P1146, P1147 and P0158, P0159, P1166, P1167 HO2S2

쐌

P0441 EVAP control system purge flow monitoring

쐌

P0444, P0445, P1444 EVAP canister purge volume control solenoid valve

쐌

P0447, P1446, P1448 EVAP canister vent control valve

쐌

P0452, P0453 EVAP control system pressure sensor

쐌

P0550 Power steering pressure sensor

쐌

P0650 MIL

쐌

P0710, P0720, P0725, P0740, P0745, P0750, P1705, P1760 A/T related sensors, solenoid valves and
switches

쐌

P1065 ECM power supply

쐌

P1122 Electric throttle control function

쐌

P1217 Engine overtemperature (OVERHEAT)

쐌

P1490, P1491 Vacuum cut valve bypass valve

쐌

P1800 VIAS control solenoid valve

쐌

P1805 Brake switch

쐌

P0011, P0021 Intake valve timing control

쐌

P0171, P0172 and P0174, P0175 Fuel injection system function

쐌

P0300-P0306 Misfire

쐌

P0420, P0430 Three way catalyst function

쐌

P0442, P0456, P1456 EVAP control system (SMALL LEAK, VERY SMALL LEAK)

쐌

P0455 EVAP control system (GROSS LEAK)

쐌

P0506, P0507 ISC system

쐌

P0731-P0734, P0744 A/T function

쐌

P1121 Electric throttle control actuator

쐌

P1124, P1126 Throttle control motor relay

쐌

P1128 Throttle control motor

쐌

P1148, P1168 Closed loop control

쐌

P1211 ABS/TCS control unit

쐌

P1212 ABS/TCS communication line

쐌

P1564 ASCD steering switch

쐌

P1572 ASCD brake switch

쐌

P1574 ASCD Vehicle speed sensor

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

DTC Inspection Priority Chart

EC-124

Fail-safe Chart

=NHEC1425

When the DTC listed below is detected, the ECM enters fail-safe mode and the MIL lights up.

DTC No.

Detected items

Engine operating condition in fail-safe mode

P0102
P0103

P1102

Mass air flow sensor circuit

Engine speed will not rise more than 2,400 rpm due to the fuel cut.

P0117
P0118

Engine coolant temperature
sensor circuit

Engine coolant temperature will be determined by ECM based on the time after
turning ignition switch “ON” or “START”.
CONSULT-II displays the engine coolant temperature decided by ECM.

Condition

Engine coolant temperature decided

(CONSULT-II display)

Just as ignition switch is turned
ON or Start

40°C (104°F)

More than approx. 4 minutes
after ignition ON or Start

80°C (176°F)

Except as shown above

40 - 80°C (104 - 176°F)

(Depends on the time)

When the fail-safe system for engine coolant temperature sensor is activated, the
cooling fan operates while engine is running.

P0122
P0123
P0222
P0223
P2135

Throttle position sensor

The ECM controls the electric throttle control actuator in regulating the throttle
opening in order for the idle position to be within +10 degrees.
The ECM regulates an opening speed of approx. 5 seconds to an opening of 10
degrees. So, the acceleration will be poor.

P1121

Electric throttle control
actuator

(When electric throttle control actuator does not function properly due to the return
spring malfunction:)
ECM controls the electric throttle actuator by regulating the throttle opening around
the idle position. The engine speed will not rise more than 2,000 rpm.

(When throttle valve opening angle in fail-safe mode is not in specified range:)
ECM controls the electric throttle control actuator by regulating the throttle opening
to 20 degrees or less.

(When ECM detects the throttle valve is stuck open:)
While the vehicle is driving, it slows down gradually by fuel cut. After the vehicle
stops, the engine stalls.
The engine can restart in N or P position, and engine speed will not exceed 1,000
rpm or more.

P1122

Electric throttle control func-
tion

ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.

P1124
P1126

Throttle control relay

ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.

P1128

Throttle control motor

ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.

P1129

Sensor power supply

ECM stops the electric throttle control actuator control, throttle valve is maintained
at a fixed opening (approx. 5 degrees) by the return spring.

P2122
P2123
P2127
P2128
P2138

Accelerator pedal position
sensor

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Fail-safe Chart

EC-125

Symptom Matrix Chart

=NHEC0041

SYSTEM — BASIC ENGINE CONTROL SYSTEM

NHEC0041S01

SYMPTOM

Reference
page

HARD/NO

T/REST

(EXCP

HA)

ENGINE

ALL

HESIT

TION/SURGING/FLA

SPOT

ARK

KNOCK/DET

ONA

TION

LACK

POWER/POOR

ACCELERA

TION

HIGH

IDLE/LOW

IDLE

ROUGH

IDLE/HUNTING

IDLING

VIBRA

TION

SLOW/NO

RETURN

IDLE

OVERHEA

TS/W

TER

TEMPERA

TURE

HIGH

EXCESSIVE

FUEL

CONSUMPTION

EXCESSIVE

OIL

CONSUMPTION

TTER

DEAD

(UNDER

CHARGE)

Warranty symptom code

AA AB AC AD AE AF AG

AK AL AM HA

Fuel

Fuel pump circuit

EC-698

Fuel pressure regulator system

EC-56

Injector circuit

EC-688

Evaporative emission system

EC-37

Air

Positive crankcase ventilation sys-
tem

EC-52

Incorrect idle speed adjustment

EC-119

Electric throttle control actuator

EC-451, 453,
461, 467

Ignition

Incorrect ignition timing adjustment

EC-119

Ignition circuit

EC-677

Main power supply and ground circuit

EC-152

Air conditioner circuit

HA section

VDC/TCS/ABS control unit

EC-506,
EC-508

1 - 6: The numbers refer to the order of inspection.
(continued on next page)

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Symptom Matrix Chart

EC-126

SYMPTOM

Reference
page

HARD/NO

T/REST

(EXCP

HA)

ENGINE

ALL

HESIT

TION/SURGING/FLA

SPOT

ARK

KNOCK/DET

ONA

TION

LACK

POWER/POOR

ACCELERA

TION

HIGH

IDLE/LOW

IDLE

ROUGH

IDLE/HUNTING

IDLING

VIBRA

TION

SLOW/NO

RETURN

IDLE

OVERHEA

TS/W

TER

TEMPERA

TURE

HIGH

EXCESSIVE

FUEL

CONSUMPTION

EXCESSIVE

OIL

CONSUMPTION

TTER

DEAD

(UNDER

CHARGE)

Warranty symptom code

AA AB AC AD AE AF AG

AK AL AM HA

Engine
control

Crankshaft position sensor (POS)
circuit

EC-310

Camshaft position sensor
(PHASE) circuit

EC-317

Mass air flow sensor circuit

EC-184, 191,
445

Heated oxygen sensor 1 circuit

EC-221, 229,
241, 472, 479

Engine coolant temperature sen-
sor circuit

EC-203, 214

Throttle position sensor circuit

EC-656, 290,
208, 528, 530

Accelerator pedal position sensor
circuit

EC-662, 643,
650

Vehicle speed sensor circuit

Knock sensor circuit

ECM

Start signal circuit

Park/Neutral position switch circuit

EC-627

Power steering pressure sensor
circuit

EC-430

Electrical load signal circuit

EC-724

1 - 6: The numbers refer to the order of inspection.
(continued on next page)

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Symptom Matrix Chart (Cont’d)

EC-127

SYSTEM — ENGINE MECHANICAL & OTHER

NHEC0041S02

SYMPTOM

Reference
section

HARD/NO

T/REST

(EXCP

HA)

ENGINE

ALL

HESIT

TION/SURGING/FLA

SPOT

ARK

KNOCK/DET

ONA

TION

LACK

POWER/POOR

ACCELERA

TION

HIGH

IDLE/LOW

IDLE

ROUGH

IDLE/HUNTING

IDLING

VIBRA

TION

SLOW/NO

RETURN

IDLE

OVERHEA

TS/W

TER

TEMPERA

TURE

HIGH

EXCESSIVE

FUEL

CONSUMPTION

EXCESSIVE

OIL

CONSUMPTION

TTER

DEAD

(UNDER

CHARGE)

Warranty symptom code

AA AB AC AD AE AF AG

AK AL AM HA

Fuel

Fuel tank

FE section

Fuel piping

—

Vapor lock

Valve deposit

Poor fuel (Heavy weight gasoline,
Low octane)

Air

Air duct

Air cleaner

Air leakage from air duct
(Mass air flow sensor — throttle
body)

Air leakage from intake manifold/
Collector/Gasket

—

Cranking

Battery

EL section

Alternator circuit

Starter circuit

Flywheel/Drive plate

EM section

PNP switch

AT section

1 - 6: The numbers refer to the order of inspection.
(continued on next page)

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

Symptom Matrix Chart (Cont’d)

EC-128

Infiniti I30. Emission Control System (2003 year). Manual - part 8