Infiniti FX35, FX50 (S51). Manual - part 650

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

EC-141

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

C

D

E

F

G

H

I

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A

EC

N

P

O

• Malfunctioning seal in intake air system, etc.

>> GO TO 30.

29.

CHECK “A/F ALPHA-B1”, “A/F ALPHA-B2”, AND “B/FUEL SCHDL”

Select “A/F ALPHA-B1”, “A/F ALPHA-B2”, and “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and
check that each indication is within the SP value. 

Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Detect malfunctioning part according to 

EC-554, "Symptom Table"

.

30.

CHECK “B/FUEL SCHDL”

Select “B/FUEL SCHDL” in “SPEC” of “DATA MONITOR” mode, and then check that the indication is within
the SP value.

Is the measurement value within the SP value?

YES

>> INSPECTION END

NO

>> Detect malfunctioning part according to 

EC-554, "Symptom Table"

.

EC-142

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

POWER SUPPLY AND GROUND CIRCUIT

POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000005236737

1.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection M95. Refer to Ground Inspection in 

GI-39, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace ground connection.

2.

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check the continuity between ECM harness connector and ground.

3.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> GO TO 3.

3.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F103, M116
• Harness for open or short between ECM and ground

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

4.

CHECK ECM POWER SUPPLY CIRCUIT-I

1.

Reconnect ECM harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E3, F1
• IPDM E/R harness connector E7
• 10 A fuse (No. 44)
• Harness for open or short between ECM and fuse

ECM

Ground

Continuity

Connector

Terminal

F101

8

Ground

Existed

M107

123

124

127

128

ECM

Voltage

+

–

Connector

Terminal

Connector

Terminal

F102

53

M107

128

Battery voltage

POWER SUPPLY AND GROUND CIRCUIT

EC-143

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

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

6.

CHECK ECM POWER SUPPLY CIRCUIT-II

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Check the voltage between ECM harness connector terminals as follows.

Is the inspection result normal?

YES

>> GO TO 7.

NO

>> GO TO 9.

7.

CHECK ECM POWER SUPPLY CIRCUIT-III

1.

Turn ignition switch ON.

2.

Check the voltage between IPDM E/R harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Replace IPDM E/R.

8.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

>> INSPECTION END

9.

CHECK ECM POWER SUPPLY CIRCUIT-IV

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Check the voltage between ECM harness connector terminals as follows.

Is the inspection result normal?

YES

>> GO TO 13.

NO

>> GO TO 10.

10.

CHECK ECM POWER SUPPLY CIRCUIT-V

1.

Disconnect ECM harness connector.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

ECM

Voltage

Connector

+

–

Terminal

Terminal

M107

125

128

After turning ignition switch OFF, battery volt-
age will exist for a few seconds, then drop to 
approximately 0 V.

IPDM E/R

Ground

Voltage

Connector

Terminal

E7

53

Ground

Battery voltage

ECM

Voltage

+

–

Connector

Terminal

Connector

Terminal

F101

24

M107

128

Battery voltage

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

F101

24

E7

69

Existed

EC-144

< DTC/CIRCUIT DIAGNOSIS >

[VQ35HR]

POWER SUPPLY AND GROUND CIRCUIT

4.

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

Is the inspection result normal?

YES

>> GO TO 12.

NO

>> GO TO 11.

11.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E3, F1
• Harness connectors F104, F105
• Harness for open or short between ECM and IPDM E/R

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

12.

CHECK 15 A FUSE

1.

Disconnect 15 A fuse (No. 50) from IPDM E/R.

2.

Check 15 A fuse.

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> Replace 15 A fuse.

13.

CHECK ECM POWER SUPPLY CIRCUIT-V

1.

Disconnect ECM harness connector.

2.

Disconnect IPDM E/R harness connector.

3.

Check the continuity between ECM harness connector and IPDM E/R harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 15.

NO

>> GO TO 14.

14.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors E106, M6
• Harness for open or short between ECM and IPDM E/R

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

15.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-36, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R.

NO

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

ECM

IPDM E/R

Continuity

Connector

Terminal

Connector

Terminal

M107

125

E7

49

Existed