Nissan Xterra. Instruction — part 333
EC-458
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
ASCD INDICATOR
ASCD INDICATOR
Component Description
INFOID:0000000009484212
ASCD indicator lamp illuminates to indicate ASCD operation status. Lamp has two indicators, CRUISE and
SET, and is integrated in combination meter.
CRUISE indicator illuminates when MAIN switch on ASCD steering switch is turned ON to indicated that
ASCD system is ready for operation.
SET indicator illuminates when the following conditions are met.
• CRUISE indicator is illuminated.
• SET/COAST switch on ASCD steering switch is turned ON while vehicle speed is within the range of the
ASCD setting.
SET indicator remains lit during ASCD control.
for the ASCD function.
Diagnosis Procedure
INFOID:0000000009484213
1.
CHECK OVERALL FUNCTION
Check ASCD indicator under the following conditions.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
2.
CHECK DTC
Check that DTC UXXXX is not displayed.
OK or NG
OK
>> GO TO 3.
NG
>> Perform trouble diagnoses for DTC UXXXX.
3.
CHECK COMBINATION METER FUNCTION
.
OK or NG
OK
>> GO TO 4.
NG
>> Go to
MWI-5, "METER SYSTEM : System Diagram"
.
4.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
>> INSPECTION END
ASCD INDICATOR
CONDITION
SPECIFICATION
CRUISE LAMP
• Ignition switch: ON
MAIN switch: pressed at the 1st time
→ at the 2nd time
ON
→ OFF
SET LAMP
• MAIN switch: ON
• When vehicle speed is be-
tween 40 km/h (25 MPH) and
144 km/h (89 MPH)
ASCD: Operating
ON
ASCD: Not operating
OFF
COOLING FAN
EC-459
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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COOLING FAN
Description
INFOID:0000000009484214
COMPONENT DESCRIPTION
Cooling Fan Motor
The cooling fan operates at each speed when the current flows in the cooling fan motor as follows.
Diagnosis Procedure
INFOID:0000000009484215
1.
CHECK IPDM E/R GROUND CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect IPDM E/R harness connectors E122, E124.
3. Check harness continuity between IPDM E/R terminals 38, 59 and ground.
Refer to Wiring Diagram.
4. Also check harness for short to power.
OK or NG
OK
>> GO TO 2.
NG
>> Repair open circuit or short to power in harness or connectors.
2.
CHECK COOLING FAN MOTOR CIRCUIT FOR OPEN AND SHORT
1. Disconnect cooling fan motor harness connector.
2. Check harness continuity between the following;
cooling fan motor terminal 1 and IPDM E/R terminal 20,
cooling fan motor terminal 2 and IPDM E/R terminal 24.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 3.
NG
>> Repair open circuit or short to ground or short to power
in harness or connectors.
3.
CHECK COOLING FAN MOTER GROUND CIRCUIT FOR OPEN OR SHORT
1. Check harness continuity between the following;
cooling fan motor terminal 3 and ground,
cooling fan motor terminal 4 and ground.
Refer to Wiring Diagram.
2. Also check harness for short to power.
OK or NG
OK
>> GO TO 4.
NG
>> Repair open circuit or short to power in harness or connectors.
Cooling fan speed
Cooling fan motor terminals
(+)
(
−)
Low (LOW)
1
3 and 4
2
3 and 4
High (HI)
1 and 2
3 and 4
Continuity should exist.
Continuity should exist.
BBIA0555E
Continuity should exist.
EC-460
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
COOLING FAN
4.
CHECK COOLING FAN MOTOR
EC-460, "Component Inspection"
OK or NG
OK
>> GO TO 5.
NG
>> Replace cooling fan motor. Refer to
.
5.
CHECK INTERMITTENT INCIDENT
Perform
GI-40, "Intermittent Incident"
.
OK or NG
OK
>> INSPETION END
NG
>> Repair or replace harness or connector.
Component Inspection
INFOID:0000000009484216
COOLING FAN MOTOR
1. Disconnect cooling fan motor harness connectors.
2. Supply cooling fan motor terminals with battery voltage and check operation.
Cooling fan motor should operate.
If NG, replace cooling fan motor.
Cooling fan speed
Cooling fan motor terminals
(+)
(
−)
Low
1
3 and 4
2
3 and 4
High
1 and 2
3 and 4
ELECTRICAL LOAD SIGNAL
EC-461
< DTC/CIRCUIT DIAGNOSIS >
[VQ40DE]
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ELECTRICAL LOAD SIGNAL
Description
INFOID:0000000009484217
The electrical load signal (Headlamp switch signal, etc.) is transferred through the CAN communication line
from BCM to ECM via IPDM E/R.
Diagnosis Procedure
INFOID:0000000009484218
1.
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-I
1. Turn ignition switch ON.
2. Connect CONSULT and select “DATA MONITOR” mode.
3. Select “LOAD SIGNAL” and check indication under the following conditions.
OK or NG
OK
>> GO TO 2.
NG
>> GO TO 4.
2.
CHECK LOAD SIGNAL CIRCUIT OVERALL FUNCTION-II
Check “LOAD SIGNAL” indication under the following conditions.
OK or NG
OK
>> GO TO 3.
NG
>> GO TO 5.
3.
CHECK HEATER FAN SIGNAL CIRCUIT OVERALL FUNCTION
Select “HEATER FAN SW” and check indication under the following conditions.
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 6.
4.
CHECK REAR WINDOW DEFOGGER SYSTEM
>> INSPECTION END
5.
CHECK HEADLAMP SYSTEM
>> INSPECTION END
6.
CHECK HEATER FAN CONTROL SYSTEM
HAC-52, "Symptom Matrix Chart"
.
Condition
Indication
Rear window defogger switch: ON
ON
Rear window defogger switch: OFF
OFF
Condition
Indication
Lighting switch: ON at 2nd position
ON
Lighting switch: OFF
OFF
Condition
Indication
Heater fan control switch: ON
ON
Heater fan control switch: OFF
OFF
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