2001 NISSAN PICK-UP Repair Manual

GEC125A
TROUBLE DIAGNOSIS FOR POWER SUPPLYYD25DDTi
Main Power Supply and Ground Circuit
(Cont'd)
EC-3472

WIRING DIAGRAM - RHD MODELS
GEC126A
TROUBLE DIAGNOSIS FOR POWER SUPPLYYD25DDTi
Main Power Supply and Ground Circuit
(Cont'd)
EC-3473

GEC127A
TROUBLE DIAGNOSIS FOR POWER SUPPLYYD25DDTi
Main Power Supply and Ground Circuit
(Cont'd)
EC-3474

DIAGNOSTIC PROCEDURE
1 INSPECTION START
Start engine.
Is engine running?
Yes or No
YescGO TO 14.
NocGO TO 2.
2 CHECK ECM POWER SUPPLY CIRCUIT-I
1. Turn ignition switch ªONº.
2. Check voltage between ECM terminal 38 and ground with CONSULT-II or tester.
SEF397Y
OK or NG
OKcGO TO 4.
NGcGO TO 3.
3 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors M47, F55 (RHD models)
+Fuse block (J/B) connector M10, M12
+10A fuse
+Harness for open or short between ECM and fuse
cRepair open circuit or short to ground or short to power in harness or connectors.
4 CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 39, 43, 106, 112, 118 and engine ground. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 6.
NGcGO TO 5.
TROUBLE DIAGNOSIS FOR POWER SUPPLYYD25DDTi
Main Power Supply and Ground Circuit
(Cont'd)
EC-3475

5 DETECT MALFUNCTIONING PART
Check harness for open or short between ECM and engine ground
cRepair open circuit or short to ground or short to power in harness or connectors.
6 CHECK ECM POWER SUPPLY CIRCUIT-II
1. Reconnect ECM harness connector.
2. Turn ignition switch ªONº and then ªOFFº.
3. Check voltage between ECM terminals 56, 61 and ground with CONSULT-II or tester.
SEC949C
OK or NG
OKcCheck electronic control fuel injection pump power supply circuit. Refer to ªDiagnostic
Procedureº, EC-3562.
NG (Battery voltage does not
exist.)cGO TO 7.
NG (Battery voltage exists for
more than a few seconds.)cGO TO 13.
TROUBLE DIAGNOSIS FOR POWER SUPPLYYD25DDTi
Main Power Supply and Ground Circuit
(Cont'd)
EC-3476

7 CHECK ECM POWER SUPPLY CIRCUIT-III
1. Disconnect ECM relay.
SEC950C
2. Check voltage between relay terminals 2, 7 and ground with CONSULT-II or tester.
SEC241D
OK or NG
OKcGO TO 9.
NGcGO TO 8.
8 DETECT MALFUNCTIONING PART
Check the following.
+20A fuse
+Harness for open or short between ECM relay and fuse
cRepair open circuit or short to ground or short to power in harness or connectors.
9 CHECK OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 4 and ECM relay terminal 1. Refer to Wiring Diagram.
Continuity should exist.
3. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 11.
NGcGO TO 10.
TROUBLE DIAGNOSIS FOR POWER SUPPLYYD25DDTi
Main Power Supply and Ground Circuit
(Cont'd)
EC-3477

10 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors E101, M5
+Harness connectors M48, F54 (RHD models)
+Harness for open or short between ECM and ECM relay
cRepair open circuit or short to ground or short to power in harness or connectors.
11 CHECK ECM POWER SUPPLY CIRCUIT-IV
1. Check harness continuity between ECM terminals 56, 61 and ECM relay terminal 6. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 13.
NGcGO TO 12.
12 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors E101, M5
+Harness connectors M47, F55 (RHD models)
+Harness for open or short between ECM and ECM relay
cRepair open circuit or short to ground or short to power in harness or connectors.
13 CHECK ECM RELAY
1. Apply 12V direct current between ECM relay terminals 1 and 2.
2. Check continuity between ECM relay terminals 3 and 5, 7 and 6.
SEF296X
OK or NG
OKcGO TO 18.
NGcReplace ECM relay.
TROUBLE DIAGNOSIS FOR POWER SUPPLYYD25DDTi
Main Power Supply and Ground Circuit
(Cont'd)
EC-3478

14 CHECK ECM POWER SUPPLY CIRCUIT-V
1. Turn ignition switch ªOFFº.
2. Disconnect ECM relay.
SEC950C
3. Disconnect ECM harness connector.
4. Check harness continuity between ECM terminals 56, 61 and ECM relay terminal 6. Refer to Wiring Diagram.
Continuity should exist.
5. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 16.
NGcGO TO 15.
15 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors M101, M5
+Harness connectors M47, F55 (RHD models)
+Harness for open or short between ECM and ECM relay
cRepair open circuit or short to ground or short to power in harness or connectors.
16 CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT
1. Check harness continuity between ECM terminals 39, 43, 106, 112, 118 and engine ground. Refer to Wiring Diagram.
Continuity should exist.
2. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 18.
NGcGO TO 17.
17 DETECT MALFUNCTIONING PART
Check harness for open or short between ECM and engine ground
cRepair open circuit or short to ground or short to power in harness or connectors.
18 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-3469.
cINSPECTION END
TROUBLE DIAGNOSIS FOR POWER SUPPLYYD25DDTi
Main Power Supply and Ground Circuit
(Cont'd)
EC-3479