Nissan Frontier D40. Instruction — part 526
P1564 ASCD STEERING SWITCH
EC-795
< COMPONENT DIAGNOSIS >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
2.
Check continuity between combination switch (spiral cable) ter-
minals 14 and 15 with pushing each switch.
Switch
Condition
Resistance [
Ω
]
MAIN switch
Pressed
Approx. 0
Released
Approx. 4,000
CANCEL switch
Pressed
Approx. 250
Released
Approx. 4,000
RESUME/ACCELERATE
switch
Pressed
Approx. 1,480
Released
Approx. 4,000
SET/COAST switch
Pressed
Approx. 660
Released
Approx. 4,000
JMBIA1066GB
EC-796
< COMPONENT DIAGNOSIS >
[VQ40DE]
P1572 ASCD BRAKE SWITCH
P1572 ASCD BRAKE SWITCH
Component Description
INFOID:0000000005273802
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 those two types of input (ON/OFF signal).
Refer to
On Board Diagnosis Logic
INFOID:0000000005273803
This self-diagnosis has the one trip detection logic.
The MIL will not illuminate for this diagnosis.
NOTE:
• If DTC P 1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
• This self-diagnosis has the one trip detection logic. When malfunction A is detected, DTC is not
stored in ECM memory. And in that case, 1st trip DTC and 1st trip freeze frame data are displayed.
1st trip DTC is erased when ignition switch is turn OFF. And even when malfunction A is detected in
two consecutive trips, DTC is not stored in ECM memory.
DTC Confirmation Procedure
INFOID:0000000005273804
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
• The procedure for malfunction B is not described. It takes an extremely long time to complete the procedure
for malfunction B. By performing the procedure for malfunction A, the condition that causes malfunction B
can be detected.
• If DTC Confirmation Procedure has been previously conducted, always perform the following before con-
ducting the next step.
1.
Turn ignition switch OFF and wait at least 10 seconds.
2.
Turn ignition switch ON.
3.
Turn ignition switch OFF and wait at least 10 seconds.
TESTING CONDITION:
Steps 4 and 5 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.
BBIA0560E
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition
Possible Cause
P1572
1572
ASCD brake switch
A)
When the vehicle speed is above 30km/h (19
MPH), ON signals from the stop lamp switch
and the ASCD brake switch are sent to ECM
at the same time.
• Harness or connectors
(The stop lamp switch circuit is shorted.)
• Harness or connectors
(The ASCD brake switch circuit is shorted.)
• Harness or connector
(The ASCD clutch switch circuit is shorted)
(M/T models)
• Stop lamp switch
• ASCD brake switch
• ASCD clutch switch
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• Incorrect ASCD clutch switch installation
• ECM
B)
ASCD brake switch signal is not sent to ECM
for extremely long time while the vehicle is
being driven
P1572 ASCD BRAKE SWITCH
EC-797
< COMPONENT DIAGNOSIS >
[VQ40DE]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
WITH CONSULT-III
1.
Start engine (VDC switch OFF).
2.
Select “DATA MONITOR” mode with CONSULT-III.
3.
Press MAIN switch and make sure that CRUISE indicator illuminates.
4.
Drive the vehicle for at least 5 consecutive seconds under the following condition.
5.
Check 1st trip DTC.
If DTC is detected, go to
.
If DTC is not detected, go to the following step.
6.
Drive the vehicle for at least 5 consecutive seconds under the following condition.
7.
Check 1st trip DTC.
8.
If DTC is detected, go to
.
WITH GST
Follow the procedure “WITH CONSULT-III” above.
Diagnosis Procedure
INFOID:0000000005273805
A/T MODELS
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
>> GO TO 2.
NG
>> GO TO 3.
2.
CHECK OVERALL FUNCTION-II
With CONSULT-III
Check “BRAKE SW2” indication in “DATA MONITOR” mode.
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.
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
EC-798
< COMPONENT DIAGNOSIS >
[VQ40DE]
P1572 ASCD BRAKE SWITCH
Without CONSULT-III
Check voltage between ECM terminal 101 and ground under the following conditions.
OK or NG
OK
>> GO TO 11.
NG
>> GO TO 7.
3.
CHECK ASCD BRAKE SWITCH POWER SUPPLY CIRCUIT
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch (1) harness connector.
-
Stop lamp switch (2)
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.
• Fuse block (J/B) connector F160
• 10A fuse
• Harness for open or short between ASCD brake switch and fuse
>> Repair open circuit or short to ground 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.
CONDITION
INDICATION
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
CONDITION
VOLTAGE
Brake pedal: Fully released
Approximately 0V
Brake pedal: Slightly depressed
Battery voltage
MBIB0060E
MBIB1214E
Voltage: Battery voltage
PBIB0857E
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