Infiniti F50. Manual - part 373

POWER SUPPLY CIRCUIT FOR ECM

EC-133

C

D

E

F

G

H

I

J

K

L

M

A

EC

POWER SUPPLY CIRCUIT FOR ECM

PFP:24110

Wiring Diagram

EBS00LWG

TBWM0140E

EC-134

POWER SUPPLY CIRCUIT FOR ECM

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)

12

W/L

Counter current return

[Ignition switch "ON"]

BATTERY VOLTAGE
(11 - 14V)

42

W/B

ECM relay
(Self shut-off)

[Engine is running]
[Ignition switch “OFF”]

●

For a few seconds after turning ignition switch 
“OFF”

0 - 1.0V

[Ignition switch “OFF”]

●

More than a few seconds after turning ignition 
switch “OFF”

BATTERY VOLTAGE
(11 - 14V)

53

W/G

Ignition switch

[Ignition switch “OFF”]

0V

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

163
166

R
R

Power supply for ECM

[Ignition switch “ON”]

BATTERY VOLTAGE
(11 - 14V)

POWER SUPPLY CIRCUIT FOR ECM

EC-135

C

D

E

F

G

H

I

J

K

L

M

A

EC

TBWM0141E

EC-136

POWER SUPPLY CIRCUIT FOR ECM

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

EBS00LWH

1. 

INSPECTION START

Start engine.
Is engine running?

Yes or No

Yes

>> GO TO 10.

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 53 and ground with CON-
SULT-II or tester.

OK or NG

OK

>> GO TO 4.

NG

>> GO TO 3.

3. 

DETECT MALFUNCTIONING PART

Check the following.

●

Harness connectors E32, F32

●

Fuse block (J/B) No. 1 connector M1

●

Fuse block (J/B) No. 2 connector M143, E215

●

Joint connector-19

●

15A fuse

●

Harness for open or short between ECM and fuse

>> Repair harness or connectors.

TER-

MINAL 

NO.

WIRE 

COLOR

ITEM

CONDITION

DATA (DC Voltage)

156
159
165
168

B
B
B/W
B/W

ECM ground

[Engine is running]

●

Idle speed

Engine ground

Voltage:

Battery voltage

PBIB0070E