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
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