Infiniti QX56 (JA60). Manual — part 434
EC-388
< COMPONENT DIAGNOSIS >
[VK56DE]
ASCD BRAKE SWITCH
ASCD BRAKE SWITCH
Component Description
INFOID:0000000005149464
When the brake pedal is depressed, ASCD brake switch is turned
OFF and stop lamp switch is turned ON. ECM detects the state of
the brake pedal by this input of two kinds (ON/OFF signal).
Diagnosis Procedure
INFOID:0000000005149465
1.
CHECK OVERALL FUNCTION-I
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 voltage between ECM terminal 108 and ground under the
following conditions.
OK or NG
OK
>> INSPECTION END.
NG
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
BBIA0373E
CONDITION
INDICATION
Brake pedal: Slightly depressed
OFF
Brake pedal: Fully released
ON
CONDITION
VOLTAGE
Brake pedal: Slightly depressed
Approximately 0 V
Brake pedal: Fully released
Battery voltage
MBIB0061E
ASCD BRAKE SWITCH
EC-389
< COMPONENT DIAGNOSIS >
[VK56DE]
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2. Disconnect ASCD brake switch harness connector.
3. Turn ignition switch ON.
4. Check voltage between ASCD brake switch terminal 1 and
ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 4.
NG
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M4
• 10 A fuse (No. 15)
• Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit or short to ground or short to power in harness or connectors.
4.
CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Check harness continuity between ECM terminal 108 and ASCD brake switch terminal 2.
Refer to Wiring Diagram.
4. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 5.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK ASCD BRAKE SWITCH
EC-390, "Component Inspection"
OK or NG
OK
>> GO TO 6.
NG
>> Replace ASCD brake switch.
6.
CHECK INTERMITTENT INCIDENT
GI-35, "How to Check Terminal"
GI-38, "Intermittent Incident"
>> INSPECTION END
BBIA0373E
Voltage: Battery voltage
PBIB0857E
Continuity should exist.
EC-390
< COMPONENT DIAGNOSIS >
[VK56DE]
ASCD BRAKE SWITCH
Component Inspection
INFOID:0000000005149466
ASCD BRAKE SWITCH
1. Turn ignition switch OFF.
2. Disconnect ASCD brake switch harness connector.
3. Check harness continuity between ASCD brake switch terminals
1 and 2 under the following conditions.
If NG, adjust ASCD brake switch installation, refer to
, and perform step 3 again.
Condition
Continuity
Brake pedal: Fully released
Should exist.
Brake pedal: Slightly depressed
Should not exist.
PBIB1536E
ASCD INDICATOR
EC-391
< COMPONENT DIAGNOSIS >
[VK56DE]
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ASCD INDICATOR
Component Description
INFOID:0000000005149467
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 indicate that ASCD
system is ready for operation.
SET indicator illuminates when 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 ASCD
setting.
SET indicator remains lit during ASCD control.
Diagnosis Procedure
INFOID:0000000005149468
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 diagnosis for DTC UXXXX.
3.
CHECK COMBINATION METER FUNCTION
OK or NG
OK
>> GO TO 4.
NG
>> Go to
.
4.
CHECK INTERMITTENT INCIDENT
GI-35, "How to Check Terminal"
GI-38, "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 between
40 km/h (25 MPH) and 144 km/h
(89 MPH)
• ASCD: Operating
ON
• ASCD: Not operating
OFF
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