2001 NISSAN PICK-UP Repair Manual

Diagnostic ProcedureNEEC1006
LEC091A
TROUBLE DIAGNOSIS Ð SPECIFICATION
VALUE
KA24DE (EURO OBD)
Diagnostic Procedure
EC-3120

SEF768Z
TROUBLE DIAGNOSIS Ð SPECIFICATION
VALUE
KA24DE (EURO OBD)
Diagnostic Procedure
EC-3121

LEC090A
TROUBLE DIAGNOSIS Ð SPECIFICATION
VALUE
KA24DE (EURO OBD)
Diagnostic Procedure
EC-3122

DescriptionNEEC0045Intermittent incidents (I/I) may occur. In many cases, the problem resolves itself (the part or circuit function
returns to normal without intervention). It is important to realize that the symptoms described in the custom-
er's complaint often do not recur on DTC (1st trip) visits. Realize also that the most frequent cause of I/I
occurrences is poor electrical connections. Because of this, the conditions under which the incident occurred
may not be clear. Therefore, circuit checks made as part of the standard diagnostic procedure may not indi-
cate the specific problem area.
COMMON I/I REPORT SITUATIONSNEEC0045S01
STEP in Work Flow Situation
IIThe CONSULT-II is used. The SELF-DIAG RESULTS screen shows time data other than ª0º or
ª1tº.
III The symptom described by the customer does not recur.
IV (1st trip) DTC data does not appear during the DTC CONFIRMATION PROCEDURE.
VI The TROUBLE DIAGNOSIS for PXXXX does not indicate the problem area.
Diagnostic ProcedureNEEC0046
1 INSPECTION START
Erase (1st trip) DTCs. Refer to ªHOW TO ERASE EMISSION-RELATED INFORMATIONº, EC-3060.
©GO TO 2.
2 CHECK GROUND TERMINALS
Check ground terminals for corroding or loose connection. Refer to ªCircuit Inspectionº, ªGROUND INSPECTIONº, GI sec-
tion.
OK or NG
OK©GO TO 3.
NG©Repair or replace.
3 SEARCH FOR ELECTRICAL INCIDENT
Perform ªIncident Simulation Testsº, GI section.
OK or NG
OK©INSPECTION END
NG©Repair or replace.
TROUBLE DIAGNOSIS FOR INTERMITTENT
INCIDENT
KA24DE (EURO OBD)
Description
EC-3123

Main Power Supply and Ground Circuit
WIRING DIAGRAMNEEC0047
GEC233A
TROUBLE DIAGNOSIS FOR POWER
SUPPLY
KA24DE (EURO OBD)
Main Power Supply and Ground Circuit
EC-3124

GEC234A
TROUBLE DIAGNOSIS FOR POWER
SUPPLY
KA24DE (EURO OBD)
Main Power Supply and Ground Circuit
EC-3125

ECM TERMINALS AND REFERENCE VALUENEEC0048Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TERMI-
NAL
NO.WIRE
COLORITEM CONDITION DATA (DC Voltage)
4 L/B ECM relay (Self shut-off)[Engine is running]
[Ignition switch OFF]
+For a few seconds after turning ignition switch
OFF0-1V
[Ignition switch OFF]
+A few seconds passed after turning ignition switch
OFFBATTERY VOLTAGE
(11 - 14V)
10 B/P ECM ground[Engine is running]
+Idle speedEngine ground
19 B/P ECM ground[Engine is running]
+Idle speedEngine ground
24 W/L Ignition switch[Ignition switch OFF]0V
[Ignition switch ON]BATTERY VOLTAGE
(11 - 14V)
25 B ECM ground[Engine is running]
+Idle speedEngine ground
32 B ECM ground[Engine is running]
+Idle speedEngine ground
67 W
Power supply for ECM[Ignition switch ON]BATTERY VOLTAGE
(11 - 14V)
72 W
80 GY/L Power supply (Back-up)[Ignition switch OFF]BATTERY VOLTAGE
(11 - 14V)
116 B/P ECM ground[Engine is running]
+Idle speedEngine ground
117 W Current return[Engine is running]
+Idle speedBATTERY VOLTAGE
(11 - 14V)
124 B/P ECM ground[Engine is running]
+Idle speedEngine ground
TROUBLE DIAGNOSIS FOR POWER
SUPPLY
KA24DE (EURO OBD)
Main Power Supply and Ground Circuit
EC-3126

DIAGNOSTIC PROCEDURE=NEEC0049
1 INSPECTION START
Start engine.
Is engine running?
YesorNo
Ye s©GO TO 9.
No©GO TO 2.
2 CHECK POWER SUPPLY-I
1. Turn ignition switch OFF and then ON.
2. Check voltage between ECM terminal 24 and ground with CONSULT-II or tester.
SEF600P
Voltage: Battery voltage
OK or NG
OK©GO TO 4.
NG©GO TO 3.
3 DETECT MALFUNCTIONING PART
Check the following.
+40A fusible link
+Harness connectors E101, M5
+Ignition switch
+Fuse block M10, M12
+10A fuse
+Harness for open or short between ECM and battery
©Repair harness or connectors.
4 CHECK ECM GROUND CIRCUIT FOR OPEN AND SHORT-I
1. Turn ignition switch ªOFFº.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminals 10, 19, 25, 32, 116, 124 and engine ground.
Refer to WIRING DIAGRAM.
Continuity should exist.
4. Also check harness for short to power.
OK or NG
OK©GO TO 5.
NG©Repair open circuit or short to power in harness or connectors.
TROUBLE DIAGNOSIS FOR POWER
SUPPLY
KA24DE (EURO OBD)
Main Power Supply and Ground Circuit
EC-3127