Infiniti F50. Manual — part 374
![](/vehicles/zatt/pasieses/thed/divapey.png)
POWER SUPPLY CIRCUIT FOR ECM
EC-137
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EC
4.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
1.
Turn ignition switch “OFF”.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminals 156, 159, 165, 168 and engine ground.
Refer to Wiring Diagram.
4.
Also check harness for short to power.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
●
Joint connector-29
●
Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.
6.
CHECK POWER SUPPLY-II
1.
Disconnect ECM relay.
2.
Check voltage between ECM relay terminals 2, 5 and ground
with CONSULT-II or tester.
OK or NG
OK
>> GO TO 8.
NG
>> GO TO 7.
Continuity should exist.
PBIB0040E
PBIB0071E
![](/vehicles/zatt/pasieses/thed/ybuck.png)
EC-138
POWER SUPPLY CIRCUIT FOR ECM
7.
DETECT MALFUNCTIONING PART
Check the following.
●
10A fuse
●
20A fuse
●
Fuse block (J/B) No. 2 connector E215
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Fuse, fusible link and relay block (J/B) connector E3
●
Harness for open or short between ECM relay and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
8.
CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 42 and ECM relay terminal 1.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> Go to
.
NG
>> GO TO 9.
9.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M135, F105
●
Fuse block (J/B) No. 2 connector M143
●
Harness for open or short between ECM relay and ECM
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK ECM POWER SUPPLY CIRCUIT-III
1.
Turn ignition switch “ON” and then “OFF”.
2.
Check voltage between ECM terminals 12, 163, 166 and ground
with CONSULT-II or tester.
OK or NG
OK
>> GO TO 16.
NG (Battery voltage does not exist.)>>GO TO 11.
NG (Battery voltage exists for more than a few seconds.)>>GO TO 13.
Continuity should exist.
Voltage:
After turning ignition switch "OFF", battery
voltage will exist for a few seconds, then
drop approximately 0V.
PBIB1875E
![](/vehicles/zatt/pasieses/thed/cly.png)
POWER SUPPLY CIRCUIT FOR ECM
EC-139
C
D
E
F
G
H
I
J
K
L
M
A
EC
11.
CHECK ECM POWER SUPPLY CIRCUIT-IV
1.
Disconnect ECM relay.
2.
Check voltage between ECM relay terminal 7 and ground with
CONSULT-II or tester.
OK or NG
OK
>> GO TO 13.
NG
>> GO TO 12.
12.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness for open or short between ECM relay and 10A fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
13.
CHECK HARNESS CONTINUITY BETWEEN ECM RELAY AND ECM FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminals and ECM relay terminals as follows.
Refer to Wiring Diagram.
2.
Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 15.
NG
>> GO TO 14.
14.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M135, F105
●
Fuse block (J/B) No. 2 connector M143
●
Harness for open or short between ECM and ECM relay
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB0040E
Voltage:
Battery voltage
PBIB0074E
ECM terminal
ECM relay terminal
12
3
163, 166
6
Continuity should exist.
![](/vehicles/zatt/pasieses/thed/fohos.png)
EC-140
POWER SUPPLY CIRCUIT FOR ECM
15.
CHECK ECM RELAY
Refer to
EC-140, "Component Inspection"
OK or NG
OK
>> GO TO 16.
NG
>> Replace ECM relay.
16.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1.
Turn ignition switch “OFF”.
2.
Disconnect ECM harness connector.
3.
Check harness continuity between ECM terminals 156, 159, 165, 168 and engine ground.
Refer to Wiring Diagram.
4.
Also check harness for short to power.
OK or NG
OK
>> GO TO 18.
NG
>> GO TO 17.
17.
DETECT MALFUNCTIONING PART
Check the following.
●
Joint connector-29
●
Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.
18.
CHECK INTERMITTENT INCIDENT
Refer to
EC-132, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
.
>> INSPECTION END
Component Inspection
EBS00LWI
ECM RELAY
1.
Apply 12V direct current between ECM relay terminals 1 and 2.
2.
Check continuity between relay terminals 3 and 5, 6 and 7.
3.
If NG, replace ECM relay.
Continuity should exist.
Condition
Continuity
12V direct current supply between
terminals 1 and 2
Yes
OFF
No
PBIB0077E
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