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Infiniti I30. Emission Control System (2003 year). Manual - part 10

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

Heated oxygen sen-
sor 2 (bank 2)

[Engine is running]

쐌

Warm-up condition

쐌

Revving engine from idle to 3,000 rpm quickly
after the following conditions are met.

–

After keeping engine speed between 3,500 and
4,000 rpm for 1 minute and at idle for 1 minute
under no load

0 - Approximately 1.0V

Heated oxygen sen-
sor 1 (bank 1)

[Engine is running]

쐌

Warm-up condition

쐌

Engine speed is 2,000 rpm.

0 - Approximately 1.0V
(Periodically change)

Heated oxygen sen-
sor 1 (bank 2)

[Engine is running]

쐌

Warm-up condition

쐌

Engine speed is 2,000 rpm.

0 - Approximately 1.0V
(Periodically change)

Engine coolant tem-
perature sensor

[Engine is running]

Approximately 0 - 4.8V
Output voltage varies with engine
coolant temperature.

Crankshaft position
sensor (POS)

[Engine is running]

쐌

Idle speed

NOTE:
The pulse cycle changes depending on rpm at idle.

Approximately 2.4V

★

SEC035D

[Engine is running]

쐌

Engine speed is 2,000 rpm.

Approximately 2.3V

★

SEC036D

101

Throttle control motor
(Open)

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Gear position is “D”

쐌

Accelerator pedal fully depressing

0 - 14V

★

SEC037D

102

Throttle control motor
relay

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

[Ignition switch “OFF”]

0 - 1.0V

103

Throttle control motor
(Close)

[Ignition switch “ON”]

쐌

Engine stopped

쐌

Gear position is “D”

쐌

Accelerator pedal releasing

0 - 14V

★

SEC038D

IDX

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

ECM Terminals and Reference Value (Cont’d)

EC-145

TER-

MINAL

NO.

WIRE

COLOR

ITEM

CONDITION

DATA (DC Voltage)

105

OR/L

EVAP canister vent
control valve

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

106
108

B
B

ECM ground

[Engine is running]

쐌

Idle speed

Engine ground

107

Throttle control motor
ground

[Ignition switch “ON”]

Approximately 0V

109

CAN communication
line

[Ignition switch “ON”]

Approximately 2.6 - 3.2V
Output voltage varies with the
communication status.

110
112

R/G
R/G

Power supply for
ECM

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

111

Sensors’ power sup-
ply

[Ignition switch “ON”]

Approximately 5V

113

CAN communication
line

[Ignition switch “ON”]

Approximately 1.7 - 2.3V
Output voltage varies with the
communication status.

115

Data link connector

[Ignition switch “ON”]

쐌

CONSULT-II or GST is disconnected.

BATTERY VOLTAGE
(11 - 14V)

★

: Average voltage for pulse signal (Actual pulse signal can be confirmed by oscilloscope.)

TROUBLE DIAGNOSIS — GENERAL DESCRIPTION

ECM Terminals and Reference Value (Cont’d)

EC-146

Description

NHEC0717

The specification (SP) value indicates the tolerance of the value that is displayed in “DATA MONITOR (SPEC)”
mode of CONSULT-II during normal operation of the Engine Control System. When the value in “DATA MONI-
TOR (SPEC)” mode is within the SP value, the Engine Control System is confirmed OK. When the value in
“DATA MONITOR (SPEC)” mode is NOT within the SP value, the Engine Control System may have one or
more malfunctions.
The SP value is used to detect malfunctions that may affect the Engine Control System, but will not light the
MIL.
The SP value will be displayed for the following three items:

쐌

B/FUEL SCHDL (The fuel injection pulse width programmed into ECM prior to any learned on board cor-
rection)

쐌

A/F ALPHA-B1/B2 (The mean value of air-fuel ratio feedback correction factor per cycle)

쐌

MAS A/F SE-B1 (The signal voltage of the mass air flow sensor)

Testing Condition

NHEC0718

쐌

Vehicle driven distance: More than 5,000 km (3,107 miles)

쐌

Barometric pressure: 98.3 - 104.3 kPa (1.003 - 1.064 kg/cm

, 14.25 - 15.12 psi)

쐌

Atmospheric temperature: 20 - 30°C (68 - 86°F)

쐌

Engine coolant temperature: 75 - 95°C (167 - 203°F)

쐌

Transmission: Warmed-up*1

쐌

Electrical load: Not applied*2

쐌

Engine speed: Idle

*1: After the engine is warmed up to normal operating temperature, drive vehicle until “FLUID TEMP SE” (A/T
fluid temperature sensor signal) indicates less than 0.9V.
*2: Rear window defogger switch, air conditioner switch, lighting switch are “OFF”. Cooling fans are not oper-
ating. Steering wheel is straight ahead.

SEF601Z

Inspection Procedure

NHEC0719

NOTE:
Perform “DATA MONITOR (SPEC)” mode in maximum scale dis-
play.
1.

Perform “Basic Inspection”, EC-119.

Confirm that the testing conditions indicated above are met.

Select “B/FUEL SCHDL”, “A/F ALPHA-B1”, “A/F ALPHA-B2”
and “MAS A/F SE-B1” in “DATA MONITOR (SPEC)” mode with
CONSULT-II.

Make sure that monitor items are within the SP value.

If NG, go to “Diagnostic Procedure”, EC-148.

IDX

TROUBLE DIAGNOSIS — SPECIFICATION VALUE

Description

EC-147

Diagnostic Procedure

NHEC0720

SEF613ZD

TROUBLE DIAGNOSIS — SPECIFICATION VALUE

Diagnostic Procedure

EC-148

SEF768Z

IDX

TROUBLE DIAGNOSIS — SPECIFICATION VALUE

Diagnostic Procedure (Cont’d)

EC-149

SEF615ZA

TROUBLE DIAGNOSIS — SPECIFICATION VALUE

Diagnostic Procedure (Cont’d)

EC-150

Description

NHEC0045

Intermittent incidents (I/I) may occur. In many cases, the malfunction resolves itself (the part or circuit function
returns to normal without intervention). It is important to realize that the symptoms described in the custom-
er’s complaint often do not recur on (1st trip) DTC visits. Realize also that the most frequent cause of I/I
occurrences is poor electrical connections. Because of this, the conditions under which the incident occurred
may not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may not indi-
cate the specific malfunctioning area.

COMMON I/I REPORT SITUATIONS

NHEC0045S01

STEP in Work Flow

Situation

The CONSULT-II is used. The SELF-DIAG RESULTS screen shows time data other than “0” or “[1t]”.

III

The symptom described by the customer does not recur.

(1st trip) DTC does not appear during the DTC Confirmation Procedure.

The Diagnostic Procedure for PXXXX does not indicate the malfunctioning area.

Diagnostic Procedure

NHEC0046

INSPECTION START

Erase (1st trip) DTCs. Refer to “HOW TO ERASE EMISSION — RELATED INFORMATION”, EC-89.

䊳

GO TO 2.

CHECK GROUND TERMINALS

Check ground terminals for corroding or loose connection.
Refer to GI-31, “GROUND INSPECTION”.

OK or NG

䊳

GO TO 3.

䊳

Repair or replace.

SEARCH FOR ELECTRICAL INCIDENT

Perform GI-26, “Incident Simulation Tests”.

OK or NG

䊳

GO TO 4.

䊳

Repair or replace.

CHECK CONNECTOR TERMINALS

Refer to GI-22, “How to Check Enlarged Contact Spring of Terminal”.

OK or NG

䊳

INSPECTION END

䊳

Repair or replace connector.

IDX

TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT

Description

EC-151

Main Power Supply and Ground Circuit

WIRING DIAGRAM

NHEC0047

MEC529D

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Main Power Supply and Ground Circuit

EC-152

MEC717C

SEC043D

IDX

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Main Power Supply and Ground Circuit (Cont’d)

EC-153

DIAGNOSTIC PROCEDURE

NHEC0049

INSPECTION START

Start engine.
Is engine running?

Yes or No

Yes

䊳

GO TO 9.

䊳

GO TO 2.

CHECK ECM POWER SUPPLY CIRCUIT-I

1. Turn ignition switch “OFF” and then “ON”.
2. Check voltage between ECM terminal 43 and ground with CONSULT-II or tester.

SEF291X

OK or NG

䊳

GO TO 4.

䊳

GO TO 3.

DETECT MALFUNCTIONING PART

Check the following.

쐌

10A fuse

쐌

Harness connectors M229, F66

쐌

Fuse block (J/B) connectors M19, E89

쐌

Harness for open or short between ECM and ignition switch

䊳

Repair harness or connectors.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 48, 57, 106, 108 and engine ground.

Refer to WIRING DIAGRAM.

Continuity should exist.

4. Also check harness for short to power.

OK or NG

䊳

GO TO 5.

䊳

Repair open circuit or short to power in harness or connectors.

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Main Power Supply and Ground Circuit (Cont’d)

EC-154

CHECK POWER SUPPLY-II

1. Disconnect ECM relay.

SEC044D

2. Check voltage between ECM relay terminals 2, 6 and ground with CONSULT-II or tester.

SEF292X

OK or NG

䊳

GO TO 7.

䊳

GO TO 6.

DETECT MALFUNCTIONING PART

Check the following.

쐌

15A fuses

쐌

Joint connector-13

쐌

Harness for open or short between ECM relay and battery

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1. Check harness continuity between ECM terminal 38 and ECM relay terminal 1. Refer to WIRING DIAGRAM.

Continuity should exist.

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

OK or NG

䊳

Go to “IGNITION SIGNAL”, EC-677.

䊳

GO TO 8.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E15, F18

쐌

Harness for open or short between ECM relay and ECM

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

IDX

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Main Power Supply and Ground Circuit (Cont’d)

EC-155

CHECK ECM POWER SUPPLY CIRCUIT-II

1. Turn ignition switch “ON” and then “OFF”.
2. Check voltage between ECM terminals 110, 112 and ground with CONSULT-II or tester.

SEF294X

OK or NG

䊳

GO TO 15.

NG (Battery voltage
does not exist.)

䊳

GO TO 10.

NG (Battery voltage
exists for more than a
few seconds.)

䊳

GO TO 12.

CHECK ECM POWER SUPPLY CIRCUIT-III

1. Disconnect ECM relay.

SEC044D

2. Check voltage between ECM relay terminal 3 and ground with CONSULT-II or tester.

SEF295X

OK or NG

䊳

GO TO 12.

䊳

GO TO 11.

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Main Power Supply and Ground Circuit (Cont’d)

EC-156

DETECT MALFUNCTIONING PART

Check the following.

쐌

Joint connector-13

쐌

Harness for open or short between ECM relay and 15A fuse

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK HARNESS CONTINUITY BETWEEN ECM RELAY AND ECM FOR OPEN AND SHORT

1. Check harness continuity between ECM terminals and ECM relay terminals as follows.

Refer to WIRING DIAGRAM.

MTBL1139

Continuity should exist.

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

OK or NG

䊳

GO TO 14.

䊳

GO TO 13.

DETECT MALFUNCTIONING PART

Check the following.

쐌

Harness connectors E15, F18

쐌

Harness for open or short between ECM and ECM relay

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK ECM RELAY

1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between relay terminals 3 and 5, 6 and 7.

SEF296X

OK or NG

䊳

GO TO 15.

䊳

Replace ECM relay.

IDX

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Main Power Supply and Ground Circuit (Cont’d)

EC-157

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II

1. Turn ignition switch “OFF”.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 48, 57, 106, 108 and engine ground.

Refer to WIRING DIAGRAM.

Continuity should exist.

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

OK or NG

䊳

GO TO 16.

䊳

Repair open circuit or short to ground or short to power in harness or connectors.

CHECK INTERMITTENT INCIDENT

Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-151.

䊳

INSPECTION END

TROUBLE DIAGNOSIS FOR POWER SUPPLY

Main Power Supply and Ground Circuit (Cont’d)

EC-158

Description

NHEC1245

CAN (Controller Area Network) is a serial communication line for
real time application. It is an on-vehicle multiplex communication
line with high data communication speed and excellent error detec-
tion ability. Many electonic control units are equipped onto a
vehicle, and each control unit shares information and links with
other control units during operation (not independent). In CAN
communication, control units are connected with 2 communication
lines (CAN H line, CAN L line) allowing a high rate of information
transmission with less wiring. Each control unit transmits/receives
data but selectively reads required data only.

On Board Diagnosis Logic

NHEC1246

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

U1000*1
1000*1

CAN communication line

쐌

ECM cannot communicate to other control
unit.

쐌

ECM cannot communicate for more than
the specified time.

쐌

Harness or connectors
(CAN communication line is open or
shorted.)

U1001*2
1001*2

*1: This self-diagnosis has the one trip detection logic.
*2: The MIL will not light up for this diagnosis.

DTC Confirmation Procedure

NHEC1247

Turn ignition switch “ON” and wait at least 3 seconds.

Select “DATA MONITOR” mode with CONSULT-II.

If 1st trip DTC is detected, go to “Diagnostic Procedure”
EC-161.

IDX

DTC U1000, U1001 CAN COMMUNICATION LINE

Description

EC-159

Wiring Diagram

NHEC1248

MEC578D

DTC U1000, U1001 CAN COMMUNICATION LINE

Wiring Diagram

EC-160

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