Infiniti G35 (V35). Manual — part 418
DTC P1572 ASCD BRAKE SWITCH
EC-553
C
D
E
F
G
H
I
J
K
L
M
A
EC
Specification data are reference values and are measured between each terminal and ground.
CAUTION:
Do not use ECM ground terminals when measuring input/output voltage. Doing so may result in dam-
age to the ECM's transistor. Use a ground other than ECM terminals, such as the ground.
TER-
MINAL
NO.
WIRE
COLOR
ITEM
CONDITION
DATA (DC Voltage)
101
P/L
Stop lamp switch
[Ignition switch: OFF]
●
Brake pedal: Fully released
Approximately 0V
[Ignition switch: OFF]
●
Brake pedal: Slightly depressed
BATTERY VOLTAGE
(11 - 14V)
108
SB
ASCD brake switch
[Ignition switch: ON]
●
Brake pedal: Slightly depressed (A/T)
●
Brake pedal and/or clutch pedal: Slightly
depressed (M/T)
Approximately 0V
[Ignition switch: ON]
●
Brake pedal: Fully released (A/T)
●
Brake pedal and clutch pedal: Fully released
(M/T)
BATTERY VOLTAGE
(11 - 14V)
EC-554
DTC P1572 ASCD BRAKE SWITCH
Diagnostic Procedure
NBS00102
A/T MODELS
1.
CHECK OVERALL FUNCTION-I
With CONSULT-II
1.
Turn ignition switch ON.
2.
Select “BRAKE SW1” in “DATA MONITOR” mode with CONSULT-II.
3.
Check “BRAKE SW1” indication under the following conditions.
Without CONSULT-II
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.
CONDITION
INDICATION
Brake pedal: Slightly depressed
OFF
Brake pedal: Fully released
ON
SEC011D
CONDITION
VOLTAGE
Brake pedal: Slightly depressed
Approximately 0V
Brake pedal: Fully released
Battery voltage
MBIB0061E
DTC P1572 ASCD BRAKE SWITCH
EC-555
C
D
E
F
G
H
I
J
K
L
M
A
EC
2.
CHECK OVERALL FUNCTION-II
With CONSULT-II
1.
Select “BRAKE SW2” in “DATA MONITOR” mode with CONSULT-II.
2.
Check “BRAKE SW2” indication under the following conditions.
Without CONSULT-II
Check voltage between ECM terminal 101 and ground under the following conditions.
OK or NG
OK
>> GO TO 13.
NG
>> GO TO 8.
CONDITION
INDICATION
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
SEC013D
CONDITION
VOLTAGE
Brake pedal: Fully released
Approximately 0V
Brake pedal: Slightly depressed
Battery voltage
MBIB0060E
EC-556
DTC P1572 ASCD BRAKE SWITCH
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-II 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 E101
●
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 7.
NG
>> GO TO 6.
6.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors E10, F1
●
Harness for open or short between ECM and ASCD brake switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
PBIB1005E
Voltage: Battery voltage
PBIB0857E
Continuity should exist.
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