Nissan Quest E52. Instruction — part 539
EC-366
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1572 ASCD BRAKE SWITCH
5.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> GO TO 4.
4.
PERFORM DTC CONFIRMATION PROCEDURE A-II
1.
Drive the vehicle for at least 5 consecutive seconds under the following conditions.
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
This procedure may be conducted with the drive wheels lifted in the shop or by driving the vehicle.
If a road test is expected to be easier, it is unnecessary to lift the vehicle.
2.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
5.
PERFORM COMPONENT FUNCTION CHECK
Perform component function check. Refer to
EC-366, "Component Function Check"
NOTE:
Use component function check to check the overall function of ASCD brake switch. During this check, a DTC
might not be confirmed.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Component Function Check
INFOID:0000000009651215
1.
PERFORM COMPONENT FUNCTION CHECK
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connectors.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
PERFORM COMPONENT FUNCTION CHECK-II
Check the voltage between ECM harness connectors.
VHCL SPEED SE
More than 30 km/h (19 mph)
Selector lever
Suitable position
VHCL SPEED SE
More than 30 km/h (19 mph)
Selector lever
Suitable position
Driving location
Depress the brake pedal for more than
five seconds so as not to come off from
the above-mentioned vehicle speed.
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
E16
126
(ASCD
brake
switch
signal)
128
Brake pedal
Slightly
depressed
Approx. 0 V
Fully re-
leased
Battery voltage
P1572 ASCD BRAKE SWITCH
EC-367
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Go to
Diagnosis Procedure
INFOID:0000000009651216
1.
CHECK OVERALL FUNCTION-I
With CONSULT
1.
Turn ignition switch ON.
2.
Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT.
3.
Check “BRAKE SW1” indication under the following conditions.
Without CONSULT
1.
Turn ignition switch ON.
2.
Check the voltage between ECM harness connectors.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK OVERALL FUNCTION-II
With CONSULT
Check “BRAKE SW2” indication in “DATA MONITOR” mode.
Without CONSULT
Check the voltage between ECM harness connectors.
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
E16
122
(Stop
lamp
switch
signal)
128
Brake pedal
Slightly
depressed
Battery voltage
Fully re-
leased
Approx. 0 V
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal
Slightly depressed
OFF
Fully released
ON
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
E16
126
(ASCD
brake
switch
signal)
128
Brake pedal
Slightly
depressed
Approx. 0 V
Fully re-
leased
Battery voltage
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal
Slightly depressed
ON
Fully released
OFF
EC-368
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
P1572 ASCD BRAKE SWITCH
Is the inspection result normal?
YES
>> GO TO 16.
NO
>> 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 the voltage between ASCD brake switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 5.
NO
>> GO TO 4.
4.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 3)
• Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit, 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 the continuity between ASCD brake switch harness connector and ECM harness connector.
4.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 6.
NO
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK ASCD BRAKE SWITCH
EC-370, "Component Inspection (ASCD Brake Switch)"
.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> Replace ASCD brake switch. Refer to
.
7.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
ECM
Condition
Voltage
Con-
nector
+
–
Terminal
Terminal
E16
122
(Stop
lamp
switch
signal)
128
Brake pedal
Slightly
depressed
Battery voltage
Fully re-
leased
Approx. 0 V
ASCD brake switch
Ground
Voltage
Connector
Terminal
E109
1
Ground
Battery voltage
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E109
2
E16
126
Existed
P1572 ASCD BRAKE SWITCH
EC-369
< DTC/CIRCUIT DIAGNOSIS >
[VQ35DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2.
Disconnect stop lamp switch harness connector.
3.
Check the voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 9.
NO
>> GO TO 8.
8.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 7)
• Harness for open or short between stop lamp switch and battery
>> Repair open circuit, short to ground or short to power in harness or connectors.
9.
CHECK STOP LAMP RELAY GROUND CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp relay harness connector.
3.
Check the continuity between stop lamp relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 10.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT
1.
Connect stop lamp switch harness connector.
2.
Turn ignition switch ON.
3.
Check the voltage between stop lamp relay harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 12.
NO
>> GO TO 11.
11.
DETECT MALFUNCTIONING PART
Check the following.
• Harness for open or short between stop lamp switch and stop lamp relay
Is the inspection result normal?
YES
>> GO TO 14.
NO
>> Repair open circuit or short to ground or short to power in harness or connectors.
12.
CHECK STOP LAMP RELAY POWER SUPPLY CIRCUIT
1.
Check the voltage between stop lamp relay harness connector and ground.
Stop lamp switch
Ground
Voltage
Connector
Terminal
E115
1
Ground
Battery voltage
Stop lamp relay
Ground
Continuity
Connector
Terminal
E15
1
Ground
Existed
Stop lamp relay
Ground
Condition
Voltage (V)
Connector
Terminal
E15
2
Ground
Brake
pedal
Slightly de-
pressed
Battery voltage
Fully released
Approx. 0
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