Nissan Quest E52. Manual - part 488

EC-162

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

TROUBLE DIAGNOSIS - SPECIFICATION VALUE

• Open stuck, breakage, hose disconnection, or cracks in PCV valve
• Disconnection or cracks in EVAP purge hose, stuck open EVAP canister purge volume control solenoid

valve

• Malfunctioning seal in rocker cover gasket
• Disconnection, looseness, or cracks in hoses, such as a vacuum hose, connecting to intake air system parts
• 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-450, "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-450, "Symptom Table"

.

POWER SUPPLY AND GROUND CIRCUIT

EC-163

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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POWER SUPPLY AND GROUND CIRCUIT

Diagnosis Procedure

INFOID:0000000009651015

1.

CHECK FUSE

Check that the following fuse is not fusing.

Is the fuse fusing?

YES

>> Replace the fuse after repairing the applicable circuit.

NO

>> GO TO 2.

2.

CHECK GROUND CONNECTION

1.

Turn ignition switch OFF.

2.

Check ground connection E38. Refer to 

GI-45, "Circuit Inspection"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace ground connection.

3.

CHECK ECM GROUND CIRCUIT

1.

Disconnect ECM harness connectors.

2.

Check the continuity between ECM harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK ECM POWER SUPPLY (MAIN)-I

1.

Reconnect ECM harness connector.

2.

Turn ignition switch ON.

3.

Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> GO TO 6.

5.

CHECK ECM POWER SUPPLY (MAIN)-II

Location

Fuse No.

Capacity

IPDM E/R

#44

10 A

#50

15 A

+

−

Continuity

ECM

Connector

Terminal

F7

16

Ground

Existed

12

E16

123

124

127

128

ECM

Voltage

Connector

+

−

Terminal

E16

121

128

Battery voltage

EC-164

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

POWER SUPPLY AND GROUND CIRCUIT

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Check the voltage between ECM harness connector terminals as per the following.

Is the inspection result normal?

YES

>> GO TO 9.

NO

>> GO TO 7.

6.

CHECK ECM POWER SUPPLY (MAIN) CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connectors.

3.

Disconnect IPDM E/R harness connector.

4.

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

5.

Also check harness for short to ground.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

7.

CHECK ECM RELAY CONTROL SIGNAL

Check the voltage between ECM harness connector terminals as per the following.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

NO

>> GO TO 8.

8.

CHECK ECM RELAY CONTROL SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect IPDM E/R harness connector.

4.

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

ECM

Condition

Voltage

(Approx.)

Connector

+

−

Terminal

E16

121

128

After turning ignition switch 
OFF, battery voltage will ex-
ist for a few seconds

Drop to 0 V

+

−

Continuity

ECM

IPDM E/R

Connector

Terminal

Connector

Terminal

E16

121

E10

10

Existed

ECM

Condition

Voltage

(Approx.)

+

−

Connector

Terminal

Connector

Terminal

F7

31

E16

128

Ignition switch ON 

0 V

Turn ignition switch OFF 
and wait at least 10 sec-
onds.

Battery voltage

+

−

Continuity

ECM

IPDM E/R

Connector

Terminal

Connector

Terminal

F7

31

F12

69

Existed

POWER SUPPLY AND GROUND CIRCUIT

EC-165

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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5.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-36, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

9.

CHECK IGNITION SWITCH SIGNAL

1.

Turn ignition switch ON.

2.

Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> GO TO 11.

NO

>> GO TO 10.

10.

CHECK IGNITION SWITCH SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect IPDM E/R harness connector.

4.

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

5.

Also check harness for short to ground and to power.

Is the inspection result normal?

YES

>> Perform the trouble diagnosis for power supply circuit.

NO

>> Repair or replace error-detected parts.

11.

CHECK ECM POWER SUPPLY (BACK-UP)

Check the voltage between ECM harness connector terminals.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-42, "Intermittent Incident"

.

NO

>> GO TO 12.

12.

CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Disconnect IPDM E/R harness connector.

4.

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

ECM

Condition

Voltage

(Approx.)

Connector

+

−

Terminal

E16

109

128

Ignition switch OFF

0 V

Ignition switch ON

Battery voltage

+

−

Continuity

ECM

IPDM E/R

Connector

Terminal

Connector

Terminal

E16

109

E10

19

Existed

ECM

Voltage

+

−

Connector

Terminal

Connector

Terminal

F7

26

E16

128

Battery voltage