Nissan Sentra. Manual — part 367
EC-164
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
INFOID:0000000009758421
1.
CHECK FUSE
Check that the following fuse is not fusing.
Is the fuse fusing?
YES
>> Replace the fuse after repairing the applicable circuit.
NO
>> GO TO 2.
2.
CHECK GROUND CONNECTION
1. Turn ignition switch OFF.
2. Check ground connection E9 and E15. Refer to
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace ground connection.
3.
CHECK ECM GROUND CIRCUIT
1. Disconnect ECM harness connectors.
2. Check the continuity between ECM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> Repair or replace error-detected parts.
4.
CHECK ECM POWER SUPPLY (MAIN)-1
1. Reconnect ECM harness connector.
2. Turn ignition switch ON.
3. Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 6.
5.
CHECK ECM POWER SUPPLY (MAIN)-2
1. Turn ignition switch OFF and wait at least 10 seconds.
Location
Fuse No.
Capacity
IPDM E/R
#33
20A
#52
15A
+
−
Continuity
ECM
Connector
Terminal
F24
12
Ground
Existed
16
F25
52
E16
123
128
ECM
Voltage
Connector
+
−
Terminal
E16
121
128
Battery voltage
POWER SUPPLY AND GROUND CIRCUIT
EC-165
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
C
D
E
F
G
H
I
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K
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M
A
EC
N
P
O
2. Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 7.
6.
CHECK ECM POWER SUPPLY (MAIN) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connectors.
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
5. Also check harness for short to ground.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
7.
CHECK ECM RELAY CONTROL SIGNAL
Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal?
YES
>> Check Intermittent incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> GO TO 8.
8.
CHECK ECM RELAY CONTROL SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
5. Also check harness for short to ground and to power.
ECM
Condition
Voltage
(Approx.)
Connector
+
−
Terminal
E16
121
128
After turning ignition switch
OFF, battery voltage will ex-
ist for a few seconds
Drop to 0 V
+
−
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
E16
121
E45
25
Existed
+
−
Condition
Voltage
(Approx.)
ECM
Connector
Terminal
Connector
Terminal
F25
89
E16
128
Ignition switch ON
0 V
Turn ignition switch OFF
and wait at least 10 sec-
onds.
Battery voltage
+
−
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
F25
89
E45
31
Existed
EC-166
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
POWER SUPPLY AND GROUND CIRCUIT
Is the inspection result normal?
YES
>> Replace IPDM E/R. Refer to
PCS-58, "Removal and Installation"
(without intelligent key).
NO
>> Repair or replace error-detected parts.
9.
CHECK IGNITION SWITCH SIGNAL
1. Turn ignition switch ON.
2. Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> GO TO 11.
NO
>> GO TO 10.
10.
CHECK IGNITION SWITCH SIGNAL CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
5. Also check harness for short to ground and to power.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
11.
CHECK ECM POWER SUPPLY (BACK-UP)
Check the voltage between ECM harness connector terminals.
Is the inspection result normal?
YES
>> Check Intermittent Incident. Refer to
GI-39, "Intermittent Incident"
.
NO
>> GO TO 12.
12.
CHECK ECM POWER SUPPLY (BACK-UP) CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect IPDM E/R harness connector.
4. Check the continuity between ECM harness connector and IPDM E/R harness connector.
ECM
Condition
Voltage
(Approx.)
Connector
+
−
Terminal
E16
109
128
Ignition switch OFF
0 V
Ignition switch ON
Battery voltage
+
−
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
E16
109
E43
18
Existed
+
−
Voltage
(Approx.)
ECM
Connector
Terminal
Connector
Terminal
F25
81
E16
128
Battery voltage
POWER SUPPLY AND GROUND CIRCUIT
EC-167
< DTC/CIRCUIT DIAGNOSIS >
[MRA8DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
5. Also check harness for short to ground.
Is the inspection result normal?
YES
>> Perform the trouble diagnosis for power supply circuit.
NO
>> Repair or replace error-detected parts.
+
−
Continuity
ECM
IPDM E/R
Connector
Terminal
Connector
Terminal
F25
81
E45
32
Existed
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