Infiniti QX56 (Z62). Manual — part 628
EC-490
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
ASCD BRAKE SWITCH
ASCD BRAKE SWITCH
Component Function Check
INFOID:0000000006217989
1.
CHECK ASCD BRAKE SWITCH FUNCTION
WITH CONSULT-III
1.
Turn ignition switch ON.
2.
Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-III.
3.
Check “BRAKE SW1” indication under the following conditions.
WITHOUT CONSULT-III
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connector terminals as per the following.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000006217990
1.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Turn ignition switch ON.
4.
Check the voltage between ASCD brake switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> GO TO 2.
2.
DETECT MALFUNCTIONING PART
Check the following.
• 10 A fuse (No. 3)
• Harness for open or short between ASCD brake switch and fuse
• Loose or poor connection for each connector and harness
>> Repair open circuit or short to ground in harness or connectors.
3.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Turn ignition switch OFF.
2.
Disconnect ECM harness connector.
3.
Check the continuity between ASCD brake switch harness connector and ECM harness connector.
Monitor item
Condition
Indication
BRAKE SW1
(ASCD brake switch)
Brake pedal
Slightly depressed
OFF
Fully released
ON
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
E80
147
(ASCD brake switch signal)
175
Brake pedal
Slightly depressed
Approx. 0
Fully released
Battery voltage
ASCD brake switch
Ground
Voltage
Connector
Terminal
E109
1
Ground
Battery voltage
ASCD BRAKE SWITCH
EC-491
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between ECM and ASCD brake switch
• Loose or poor connection for each connector and harness
>> Repair open circuit, short to ground or short to power in harness or connectors.
5.
CHECK ASCD BRAKE SWITCH
EC-491, "Component Inspection (ASCD Brake Switch)"
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Replace ASCD brake switch. Refer to
BR-20, "Removal and Installation"
.
6.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (ASCD Brake Switch)
INFOID:0000000006217991
1.
CHECK ASCD BRAKE SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH-II
1.
Adjust ASCD brake switch installation. Refer to
BR-21, "Inspection and Adjustment"
2.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD brake switch. Refer to
BR-20, "Removal and Installation"
.
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E109
2
E80
147
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
EC-492
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
ASCD INDICATOR
ASCD INDICATOR
Component Function Check
INFOID:0000000006217992
1.
CHECK ASCD INDICATOR FUNCTION
Check ASCD indicator under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000006217993
1.
CHECK DTC
Check that DTC UXXXX is not displayed.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Perform trouble diagnosis for DTC UXXXX.
2.
CHECK DTC WITH COMBINATION METER
MWI-30, "CONSULT-III Function"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning part.
3.
CHECK INTERMITTENT INCIDENT
GI-40, "Intermittent Incident"
Is the inspection result normal?
YES
>> Replace combination meter. Refer to
MWI-85, "Removal and Installation"
NO
>> Repair or replace malfunctioning part.
ASCD INDICATOR
CONDITION
SPECIFICATION
CRUISE LAMP
• Ignition switch: ON
• MAIN switch: Pressed at the
1st time
→
at the 2nd time
ON
→
OFF
ELECTRICAL LOAD SIGNAL
EC-493
< DTC/CIRCUIT DIAGNOSIS >
[VK56VD]
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ELECTRICAL LOAD SIGNAL
Description
INFOID:0000000006217994
The electrical load signal (Rear window defogger switch signal, headlamp switch signal, heater fan switch sig-
nal, etc.) is transferred via the CAN communication line.
Component Function Check
INFOID:0000000006217995
1.
CHECK REAR WINDOW DEFOGGER SWITCH FUNCTION
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-III.
3.
Select “LOAD SIGNAL” and check indication under the following conditions.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> Go to
2.
CHECK LIGHTING SWITCH FUNCTION
Check “LOAD SIGNAL” indication under the following conditions.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Go to
3.
CHECK HEATER FAN CONTROL SWITCH FUNCTION
Select “HEATER FAN SW” and check indication under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000006217996
1.
INSPECTION START
Confirm the malfunctioning circuit (rear window defogger, headlamp or heater fan). Refer to
Which circuit is related to the incident?
Rear window defogger>>GO TO 2.
Headlamp>>GO TO 3.
Heater fan>>GO TO 4.
2.
CHECK REAR WINDOW DEFOGGER SYSTEM
.
Monitor item
Condition
Indication
LOAD SIGNAL
Rear window defogger switch
ON
ON
OFF
OFF
Monitor item
Condition
Indication
LOAD SIGNAL
Lighting switch
ON at 2nd position
ON
OFF
OFF
Monitor item
Condition
Indication
HEATER FAN SW
Heater fan control switch
ON
ON
OFF
OFF
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