Nissan Titan. Instruction — part 288
ASCD BRAKE SWITCH
EC-453
< 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 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-454
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
ASCD BRAKE SWITCH
6.
CHECK ASCD BRAKE SWITCH
EC-455, "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 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-455, "Component Inspection"
OK or NG
OK
>> GO TO 11.
BBIA0373E
Voltage: Battery voltage
WBIA0545E
Continuity should exist.
ASCD BRAKE SWITCH
EC-455
< 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-42, "Intermittent Incident"
GI-42, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection
INFOID:0000000009886911
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
EC-456
< DTC/CIRCUIT DIAGNOSIS >
[VK56DE]
ASCD INDICATOR
ASCD INDICATOR
Component Description
INFOID:0000000009886912
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:0000000009886913
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 U0101 or U1001 is not displayed.
OK or NG
OK
>> GO TO 3.
NG
>> Perform trouble diagnosis for DTC U0101, U1001. Refer to
.
3.
CHECK COMBINATION METER FUNCTION
MWI-28, "CONSULT Function (METER/M&A)"
OK or NG
OK
>> GO TO 4.
NG
>> Go to
MWI-93, "Removal and Installation"
4.
CHECK INTERMITTENT INCIDENT
GI-39, "How to Check Terminal"
and
GI-42, "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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