2001 NISSAN PICK-UP Repair Manual

Diagnostic Procedure
1 INSPECTION START
Do you have CONSULT-II?
Yes or No
YescGO TO 2.
NocGO TO 3.
2 CHECK OVERALL FUNCTION-I
With CONSULT-II
1. Turn ignition switch ªONº.
2. Check ªWARM UP SWº in ªDATA MONITORº mode with CONSULT-II under the following conditions.
SEF302Z
OK or NG
OKcGO TO 4.
NGcGO TO 5.
3 CHECK OVERALL FUNCTION-I
Without CONSULT-II
1. Turn ignition switch ªONº.
2. Check voltage between ECM terminal 59 and ground under the following conditions.
SEF303Z
OK or NG
OKcGO TO 4.
NGcGO TO 5.
HEAT UP SWITCHYD25DDTi
EC-3640

4 CHECK OVERALL FUNCTION-II
Check the indicator when turning ªONº and ªOFFº the heat up switch.
MTBL1314
OK or NG
OKcINSPECTION END
NGcGO TO 10.
5 CHECK HEAT UP SWITCH POWER SUPPLY CIRCUIT
1. Turn heat up switch ªOFFº.
2. Turn ignition switch ªOFFº.
3. Disconnect heat up switch harness connector.
4. Turn ignition switch ªONº.
5. Check voltage between heat up switch terminal 6 and ground with CONSULT-II or tester.
SEF304Z
OK or NG
OKcGO TO 7.
NGcGO TO 6.
6 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors N1, M6
+10A fuse
+Harness for open or short between heat up switch and fuse
cRepair open circuit or short to ground or short to power in harness or connectors.
7 CHECK HEAT UP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN OR SHORT
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 59 and heat up switch terminal 5. Refer to Wiring Diagram.
Continuity should exist.
4. Also check harness for short to ground and short to power.
OK or NG
OKcGO TO 9.
NGcGO TO 8.
HEAT UP SWITCHYD25DDTi
Diagnostic Procedure (Cont'd)
EC-3641

8 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors N1, M6
+Harness connectors M48, F54 (RHD models)
+Harness for open or short between heat up switch and ECM
cRepair open circuit or short to ground or short to power in harness or connectors.
9 CHECK HEAT UP SWITCH
Check continuity between heat up switch terminals 5 and 6 under the following conditions.
SEF305Z
OK or NG
OKcGO TO 13.
NGcReplace heat up switch.
10 CHECK HEAT UP SWITCH INDICATOR GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn heat up switch ªOFFº.
2. Turn ignition switch ªOFFº.
3. Disconnect heat up switch harness connector.
4. Check harness continuity between heat up switch terminal 4 and ground.
Refer to Wiring Diagram.
Continuity should exist.
5. Also check harness for short to power.
OK or NG
OKcGO TO 12.
NGcGO TO 11.
11 DETECT MALFUNCTIONING PART
Check the following.
+Harness connectors N2, M7
+Harness for open or short between heat up switch and ground
cRepair open circuit or short to power in harness or connectors.
12 CHECK HEAT UP SWITCH INDICATOR
Apply 12V current supply between heat up switch terminal 4 and 6.
Indicator should illuminates.
OK or NG
OKcGO TO 13.
NGcReplace heat up switch.
HEAT UP SWITCHYD25DDTi
Diagnostic Procedure (Cont'd)
EC-3642

13 CHECK INTERMITTENT INCIDENT
Refer to ªTROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENTº, EC-3469.
cINSPECTION END
HEAT UP SWITCHYD25DDTi
Diagnostic Procedure (Cont'd)
EC-3643

Wiring Diagram
LHD MODELS
GEC288A
AIR CONDITIONER CONTROLYD25DDTi
EC-3644

RHD MODELS
GEC289A
AIR CONDITIONER CONTROLYD25DDTi
Wiring Diagram (Cont'd)
EC-3645

Wiring Diagram
LHD MODELS
GEC290A
MIL & DATA LINK CONNECTORSYD25DDTi
EC-3646

GEC157A
MIL & DATA LINK CONNECTORSYD25DDTi
Wiring Diagram (Cont'd)
EC-3647