Infiniti FX35, FX50 (S51). Manual — part 720
P1568 ICC FUNCTION
EC-421
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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P1568 ICC FUNCTION
DTC Logic
INFOID:0000000005237028
DTC DETECTION LOGIC
NOTE:
• If DTC P1568 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1568 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
• If DTC P1568 is displayed with DTC P0607, first perform the trouble diagnosis for DTC P0607. Refer
.
DTC CONFIRMATION PROCEDURE
1.
PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always perform the following procedure
before conducting 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.
TESTING CONDITION:
Step 2 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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Press MAIN switch on ICC steering switch.
3.
Drive the vehicle at more than 40 km/h (25 MPH).
CAUTION:
Always drive vehicle at a safe speed.
4.
Press SET/COAST switch.
5.
Check DTC.
Is DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237029
1.
REPLACE ICC SENSOR INTEGRATED UNIT
1.
Replace ICC sensor integrated unit.
2.
Perform
CCS-18, "ACTION TEST : Special Repair Requirement (Vehicle-To-Vehicle Distance Control
.
3.
Check DTC of ICC sensor integrated unit. Refer to
CCS-44, "Diagnosis Description"
>> INSPECTION END
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition
Possible Cause
P1568
ICC function
ECM detects a difference between signals
from ICC sensor integrated unit is out of spec-
ified range.
• Harness or connectors
(The CAN communication line is open or
shorted.)
• ICC sensor integrated unit
• ECM
EC-422
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P1572 ASCD BRAKE SWITCH
P1572 ASCD BRAKE SWITCH
Description
INFOID:0000000005237030
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
for the ASCD function.
DTC Logic
INFOID:0000000005237031
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 is turned 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 procedure
before conducting 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:
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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE-I
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 illuminates.
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
ASCD brake switch
A)
When the vehicle speed is above 30 km/h
(19 MPH), ON signals from the stop lamp
switch and the ASCD brake switch are sent
to the 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.)
• Stop lamp switch
• ASCD brake switch
• Incorrect stop lamp switch installation
• Incorrect ASCD brake switch installation
• ECM
B)
ASCD brake switch signal is not sent to
ECM for extremely long time while the ve-
hicle is being driven.
VHCL SPEED SE
More than 30 km/h (19 mph)
Selector lever
Suitable position
P1572 ASCD BRAKE SWITCH
EC-423
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
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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-II
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:0000000005237032
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 terminals as follows.
Is the inspection result normal?
YES
>> GO TO 2.
NO
>> GO TO 3.
2.
CHECK OVERALL FUNCTION-II
VHCL SPEED SE
More than 30 km/h (19 mph)
Selector lever
Suitable position
Driving location
Depress the brake pedal for more than 5
seconds so as not to come off from the
above-mentioned vehicle speed.
Monitor item
Condition
Indication
BRAKE SW1
Brake pedal
Slightly depressed
OFF
Fully released
ON
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
M107
126
(ASCD brake switch signal)
128
Brake pedal
Slightly depressed
Approx. 0
Fully released
Battery voltage
EC-424
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P1572 ASCD BRAKE SWITCH
With CONSULT-III
Select “BRAKE SW2” and check indication under the following conditions.
Without CONSULT-III
Check the voltage between ECM harness connector terminals under the following conditions.
Is the inspection result normal?
YES
>> GO TO 13.
NO
>> GO TO 8.
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 7.
NO
>> GO TO 6.
Monitor item
Condition
Indication
BRAKE SW2
Brake pedal
Slightly depressed
ON
Fully released
OFF
ECM
Condition
Voltage (V)
Connector
+
–
Terminal
Terminal
M107
122
(Stop lamp switch signal)
128
Brake pedal
Slightly depressed
Battery voltage
Fully released
Approx. 0
ASCD brake switch
Ground
Voltage
Connector
Terminal
E109
1
Ground
Battery voltage
ASCD brake switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E109
2
M107
126
Existed
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