Nissan Frontier. Manual — part 511
POWER SUPPLY AND GROUND CIRCUIT
EC-615
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
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POWER SUPPLY AND GROUND CIRCUIT
Diagnosis Procedure
INFOID:0000000009481242
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 or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector M4
• Harness connectors M31, E152
• 10A fuse (No.1)
• Harness for open or short between ECM and fuse
>> Repair harness or connectors.
4.
CHECK GROUND CONNECTIONS
1. Turn ignition switch OFF.
2. Loosen and retighten three ground screws on the body. Refer to
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 12, 123, 124 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 F32, E2
• 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.
Voltage: Battery voltage
Continuity should exist.
EC-616
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
POWER SUPPLY AND GROUND CIRCUIT
2. Turn ignition switch ON.
3. Check voltage between IPDM E/R connector E119 terminal 3 and ground with CONSULT or tester.
OK or NG
OK
>> Go to .
NG
>> GO TO 8.
8.
CHECK ECM POWER SUPPLY CIRCUIT-III
1. Turn ignition switch OFF and wait at least 10 seconds.
2. Turn ignition switch ON and then OFF.
3. Check voltage between ECM terminals 121 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 13.
NG (Battery voltage does not exist.)>>GO TO 9.
NG (Battery voltage exists for more than a few seconds.)>>GO TO 11.
9.
CHECK ECM POWER SUPPLY CIRCUIT-IV
Check voltage between ECM terminal 31 and ground with CONSULT or tester.
OK or NG
OK
>> GO TO 10.
NG
>> GO TO 11.
10.
CHECK ECM POWER SUPPLY CIRCUIT-V
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E119.
3. Check harness continuity between ECM terminals 121 and IPDM E/R terminal 4.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 16.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
11.
CHECK ECM POWER SUPPLY CIRCUIT-VI
1. Disconnect ECM harness connector.
2. Disconnect IPDM E/R harness connector E119.
3. Check harness continuity between ECM terminal 31 and IPDM E/R terminal 7.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 12.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
12.
CHECK 20A FUSE
1. Disconnect 20 A fuse (No.53) from IPDM E/R.
2. Check 20 A fuse.
Voltage: Battery voltage
Voltage:
After turning ignition switch OFF, battery
voltage will exist for a few seconds, then drop
approximately 0V.
Voltage: Battery voltage
Continuity should exist.
Continuity should exist.
POWER SUPPLY AND GROUND CIRCUIT
EC-617
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
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OK or NG
OK
>> GO TO 16.
NG
>> Replace 20A fuse.
13.
CHECK GROUND CONNECTIONS
Loosen and retighten three ground screws on the body. Refer to
OK or NG
OK
>> GO TO 14.
NG
>> Repair or replace ground connections.
14.
CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-II
1. Check harness continuity between ECM terminals 12, 123, 124 and ground.
Refer to Wiring Diagram.
2. Also check harness for short to power.
OK or NG
OK
>> GO TO 16.
NG
>> GO TO 15.
15.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors F32, E2
• Harness for open or short between ECM and ground
>> Repair open circuit or short to power in harness or connectors.
16.
CHECK INTERMITTENT INCIDENT
GI-42, "Intermittent Incident"
.
OK or NG
OK
>> Replace IPDM E/R. Refer to
PCS-28, "Removal and Installation of IPDM E/R"
.
NG
>> Repair open circuit or short to power in harness or connectors.
Ground Inspection
INFOID:0000000009481243
Ground connections are very important to the proper operation of electrical and electronic circuits. Ground
connections are often exposed to moisture, dirt and other corrosive elements. The corrosion (rust) can
become an unwanted resistance. This unwanted resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper grounding. A loose or corroded ground can drasti-
cally affect an electronically controlled circuit. A poor or corroded ground can easily affect the circuit. Even
when the ground connection looks clean, there can be a thin film of rust on the surface.
When inspecting a ground connection follow these rules:
• Remove the ground bolt or screw.
• Inspect all mating surfaces for tarnish, dirt, rust, etc.
• Clean as required to assure good contact.
• Reinstall bolt or screw securely.
• Inspect for “add-on” accessories which may be interfering with the ground circuit.
• If several wires are crimped into one ground eyelet terminal, check for proper crimps. Make sure all of the
wires are clean, securely fastened and providing a good ground path. If multiple wires are cased in one eye-
let make sure no ground wires have excess wire insulation.
Continuity should exist.
EC-618
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE FOR USA AND CANADA]
POWER SUPPLY AND GROUND CIRCUIT
For detailed ground distribution information, refer to
PBIB1870E
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