Infiniti G35 (V35). Manual - part 318

POWER SUPPLY AND GROUND CIRCUIT

EC-153

C

D

E

F

G

H

I

J

K

L

M

A

EC

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

109

W/L

Ignition switch

[Ignition switch: OFF]

0V

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

111

W

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch: OFF]

●

For a few seconds after turning ignition 
switch OFF

0 - 1.5V

[Ignition switch: OFF]

●

More than a few seconds after turning igni-
tion switch OFF

BATTERY VOLTAGE
(11 - 14V)

119

120

P
L

Power supply for ECM

[Ignition switch: ON]

BATTERY VOLTAGE
(11 - 14V)

EC-154

POWER SUPPLY AND GROUND CIRCUIT

TBWM0325E

POWER SUPPLY AND GROUND CIRCUIT

EC-155

C

D

E

F

G

H

I

J

K

L

M

A

EC

Specification data are reference values and are measured between each terminal and ground.

CAUTION:

Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.

Diagnostic Procedure

NBS000NV

1. 

INSPECTION START

Start engine.
Is engine running?

Yes or No

Yes

>> GO TO 8.

No

>> GO TO 2.

2. 

CHECK ECM POWER SUPPLY CIRCUIT-I

1.

Turn ignition switch OFF and then ON.

2.

Check voltage between ECM terminal 109 and ground with
CONSULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors M72, F102

●

Fuse block (J/B) connector M4

●

10A fuse

●

Harness for open or short between ECM and fuse

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

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

1

B

ECM ground

[Engine is running]

●

Idle speed

Body ground

115
116

B/R
B

ECM ground

[Engine is running]

●

Idle speed

Body ground

Voltage: Battery voltage

MBIB0015E

EC-156

POWER SUPPLY AND GROUND CIRCUIT

4. 

CHECK GROUND CONNECTIONS

1.

Turn ignition switch OFF.

2.

Loosen and retighten two ground screws on the body. Refer to 

EC-159, "Ground Inspection"

 .

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace ground connections.

5. 

CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminals 1, 115, 116 and ground.
Refer to Wiring Diagram.

3.

Also check harness for short to power.

OK or NG

OK

>> GO TO 7.

NG

>> GO TO 6.

6. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors F102, M72

●

Harness for open or short between ECM and ground

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

7. 

CHECK ECM POWER SUPPLY CIRCUIT-II

1.

Reconnect ECM harness connector disconnected.

2.

Turn ignition switch ON.

3.

Check voltage between IPDM E/R terminal 17 and ground with
CONSULT-II or tester.

OK or NG

OK

>> Go to 

EC-665, "IGNITION SIGNAL"

 .

NG

>> GO TO 8.

PBIB2192E

Continuity should exist.

Voltage: Battery voltage

PBIB1915E