Nissan Quest E52. Instruction — part 456

EC-34

< SYSTEM DESCRIPTION >

[VQ35DE]

SYSTEM

ENGINE CONTROL SYSTEM : Circuit Diagram

INFOID:0000000009650955

JSBIA2931GB

SYSTEM

EC-35

< SYSTEM DESCRIPTION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

JSBIA4090GB

EC-36

< SYSTEM DESCRIPTION >

[VQ35DE]

SYSTEM

JSBIA4091GB

SYSTEM

EC-37

< SYSTEM DESCRIPTION >

[VQ35DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

ENGINE CONTROL SYSTEM : Fail-safe

INFOID:0000000009650956

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