Nissan Titan A60. Manual — part 442
EC-434
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
ASCD BRAKE SWITCH
ASCD BRAKE SWITCH
Component Description
INFOID:0000000006158917
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:0000000006158918
1.
CHECK OVERALL FUNCTION-I
With CONSULT-III
1. Turn ignition switch ON.
2. Select “BRAKE SW 1” in “DATA MONITOR” mode with CONSULT-III.
3. Check “BRAKE SW 1” 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
>> GO TO 2.
NG
>> GO TO 3.
2.
CHECK OVERALL FUNCTION-II
With CONSULT-III
Check “BRAKE SW 2” indication in “DATA MONITOR” mode.
Without CONSULT-III
Check voltage between ECM terminal 101 and ground under the following conditions.
BBIA0087E
CONDITION
INDICATION
Brake pedal: Slightly depressed
OFF
Brake pedal: Fully released
ON
CONDITION
VOLTAGE
Brake pedal: Slightly depressed
Approximately 0V
Brake pedal: Fully released
Battery voltage
MBIB0061E
CONDITION
INDICATION
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
ASCD BRAKE SWITCH
EC-435
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 7.
3.
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 voltage between ASCD brake switch terminal 1 and
ground with CONSULT-III or tester.
OK or NG
OK
>> GO TO 5.
NG
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M4
• 10A fuse
• 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.
5.
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 6.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
CONDITION
VOLTAGE
Brake pedal: Fully released
Approximately 0V
Brake pedal: Slightly depressed
Battery voltage
PBIB1537E
BBIA0373E
Voltage: Battery voltage
PBIB0857E
Continuity should exist.
EC-436
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
ASCD BRAKE SWITCH
6.
CHECK ASCD BRAKE SWITCH
EC-437, "Component Inspection"
OK or NG
OK
>> GO TO 11.
NG
>> Replace ASCD brake switch.
7.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check voltage between stop lamp switch terminal 1 and ground
with CONSULT -III or tester.
OK or NG
OK
>> GO TO 9.
NG
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Harness connectors M31, E152
• Fuse block (J/B) connector M60
• 10A fuse
• Harness for open or short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
9.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 101 and stop lamp switch terminal 2.
Refer to Wiring Diagram.
3. Also check harness for short to ground and short to power.
OK or NG
OK
>> GO TO 10.
NG
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK STOP LAMP SWITCH
EC-437, "Component Inspection"
OK or NG
OK
>> GO TO 11.
BBIA0373E
Voltage: Battery voltage
WBIA0545E
Continuity should exist.
ASCD BRAKE SWITCH
EC-437
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
NG
>> Replace stop lamp switch.
11.
CHECK INTERMITTENT INCIDENT
GI-39, "Intermittent Incident"
GI-39, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000006158919
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
"Inspection and Adjustment - Standard Pedal"
, and perform step
3 again.
STOP LAMP SWITCH
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check harness continuity between stop lamp switch terminals 1
and 2 under the following conditions.
If NG, adjust stop lamp switch installation, refer to
"Inspection and Adjustment - Standard Pedal"
, and perform step
3 again.
Condition
Continuity
Brake pedal: Fully released.
Should exist.
Brake pedal: Slightly depressed.
Should not exist.
SEC023D
Condition
Continuity
Brake pedal: Fully released.
Should not exist.
Brake pedal: Slightly depressed.
Should exist.
WBIA0546E
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