Infiniti G37 Coupe. Manual — part 563
P1572 ASCD BRAKE SWITCH
EC-433
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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18.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect ECM harness connector.
2.
Check the continuity between stop lamp switch harness connector and ECM harness connector.
3.
Also check harness for short to ground and short to power.
Is the inspection result normal?
YES
>> GO TO 20.
NO
>> GO TO 19.
19.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connectors E103, M2
• Harness for open or short between ECM and stop lamp switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
20.
CHECK STOP LAMP SWITCH
EC-434, "Component Inspection (Stop Lamp Switch)"
Is the inspection result normal?
YES
>> GO TO 21.
NO
>> Replace stop lamp switch.
21.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
.
>> INSPECTION END
Component Inspection (ASCD Brake Switch)
INFOID:0000000001734256
1.
CHECK ASCD BRAKE SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD brake switch harness connector.
3.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD BRAKE SWITCH-II
1.
Adjust ASCD brake switch installation. Refer to
BR-7, "Inspection and Adjustment"
.
2.
Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E110
2
M107
122
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Existed
Slightly depressed
Not existed
EC-434
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1572 ASCD BRAKE SWITCH
YES
>> INSPECTION END
NO
>> Replace ASCD brake switch.
Component Inspection (ASCD Clutch Switch)
INFOID:0000000001734257
1.
CHECK ASCD CLUTCH SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect ASCD clutch switch harness connector.
3.
Check the continuity between ASCD clutch switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK ASCD CLUTCH SWITCH-II
1.
Adjust ASCD clutch switch installation. Refer to
CL-5, "Inspection and Adjustment"
.
2.
Check the continuity between ASCD clutch switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace ASCD clutch switch.
Component Inspection (Stop Lamp Switch)
INFOID:0000000001734258
1.
CHECK STOP LAMP SWITCH-I
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check the continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH-II
1.
Adjust stop lamp switch installation. Refer to
BR-7, "Inspection and Adjustment"
2.
Check the continuity between stop lamp switch terminals under the following conditions.
Is the inspection result normal?
YES
>> INSPECTION END
NO
>> Replace stop lamp switch.
Terminals
Condition
Continuity
1 and 2
Clutch pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Clutch pedal
Fully released
Existed
Slightly depressed
Not existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
P1572 ICC BRAKE SWITCH
EC-435
< COMPONENT DIAGNOSIS >
[VQ37VHR]
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P1572 ICC BRAKE SWITCH
Description
INFOID:0000000001734259
When the brake pedal is depressed, ICC 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).
Refer to
for the ICC function.
DTC Logic
INFOID:0000000001734260
DTC DETECTION LOGIC
NOTE:
• If DTC P1572 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 OFF. And even when malfunction A is detected in two
consecutive trips, DTC is not stored in ECM memory.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following before conduct-
ing the next test.
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.
NOTE:
Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for mal-
function B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
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 lamp lights up.
4.
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.
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1572
ICC brake switch
A)
ON signals from the stop lamp switch and
the ICC brake switch are sent to ECM at
the same time.
• Harness or connectors
(The stop lamp switch circuit is shorted.)
• Harness or connectors
(The ICC brake switch circuit is shorted.)
• Stop lamp switch
• ICC brake switch
• ICC brake hold relay
• Incorrect stop lamp switch installation
• Incorrect ICC brake switch installation
• ECM
B)
ICC brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving
EC-436
< COMPONENT DIAGNOSIS >
[VQ37VHR]
P1572 ICC BRAKE SWITCH
5.
Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> GO TO 3.
3.
PERFORM DTC CONFIRMATION PROCEDURE
With CONSULT-III
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.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000001734261
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 the voltage between ECM harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 2.
NO-1
>> A/T models: GO TO 3.
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.
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal (A/T)
Brake pedal and clutch pedal (M/T)
Slightly depressed
OFF
Fully released
ON
ECM
Ground
Condition
Voltage
Connector
Terminal
M107
126
(ICC brake switch signal)
Ground
Brake pedal (A/T)
Brake pedal and clutch pedal (M/T)
Slightly depressed
Approx. 0V
Fully released
Battery voltage
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