Nissan Quest E52. Manual - part 456

EC-34

< SYSTEM DESCRIPTION >

[VQ35DE]

SYSTEM

ENGINE CONTROL SYSTEM : Circuit Diagram

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JSBIA2931GB

SYSTEM

EC-35

< SYSTEM DESCRIPTION >

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C

D

E

F

G

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A

EC

N

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O

JSBIA4090GB

EC-36

< SYSTEM DESCRIPTION >

[VQ35DE]

SYSTEM

JSBIA4091GB

SYSTEM

EC-37

< SYSTEM DESCRIPTION >

[VQ35DE]

C

D

E

F

G

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EC

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O

ENGINE CONTROL SYSTEM : Fail-safe

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NON DTC RELATED ITEM

DTC RELATED ITEM

JSBIA4092GB

Engine operating condi-

tion in fail-safe mode

Detected items

Remarks

Reference 

page

Engine speed will not 
rise more than 2,500 rpm 
due to the fuel cut

Malfunction indicator 
lamp circuit

When there is an open circuit on MIL circuit, the ECM cannot warn the 
driver by illuminating MIL when there is malfunction on engine control 
system.
Therefore, when electrical controlled throttle and part of ECM related 
diagnoses are continuously detected as NG for 5 trips, ECM warns the 
driver that engine control system malfunctions and MIL circuit is open 
by means of operating the fail-safe function.
The fail-safe function also operates when above diagnoses except MIL 
circuit are detected and demands the driver to repair the malfunction.

EC-437