Infiniti Q45. Manual — part 488
DTC P1564 ASCD STEERING SWITCH
EC-591
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4.
DETECT MALFUNCTIONING PART
Check the following.
●
Harness connectors M135, F105
●
Combination switch (spiral cable)
●
Harness for open and short between ECM and ASCD steering switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
5.
CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Check harness continuity between ECM terminal 99 and ASCD steering switch terminal 1.
Refer to Wiring Diagram.
2.
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 M135, F105
●
Combination switch (spiral cable)
●
Harness for open and short between ECM and ASCD steering switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.
CHECK ASCD STEERING SWITCH
Refer to
EC-592, "Component Inspection"
OK or NG
OK
>> GO TO 8.
NG
>> Replace ASCD steering switch.
8.
CHECK INTERMITTENT INCIDENT
Refer to
EC-145, "TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT"
>> INSPECTION END
Continuity should exist.
EC-592
DTC P1564 ASCD STEERING SWITCH
Component Inspection
NBS00248
ASCD STEERING SWITCH
1.
Disconnect ASCD steering switch.
2.
Check continuity between ASCD steering switch terminals 1 and
2 with pushing each switch.
If NG, replace ASCD steering 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
SEC008D
DTC P1568 ICC FUNCTION
EC-593
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EC
DTC P1568 ICC FUNCTION
PFP:18995
On Board Diagnosis Logic
NBS00249
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
●
If DTC P1568 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC
U1000, U1001. Refer to
EC-156, "DTC U1000, U1001 CAN COMMUNICATION LINE"
.
●
If DTC P1568 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010.
Refer to
EC-159, "DTC U1010 CAN COMMUNICATION"
●
If DTC P1568 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to
DTC Confirmation Procedure
NBS0024A
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
TESTING CONDITION:
Step 4 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.
WITH CONSULT-II
1.
Turn ignition switch ON.
2.
Select “DATA MONITOR” mode with CONSULT-II.
3.
Press MAIN switch on ICC steering switch.
4.
Drive the vehicle at more than 40 km/h (25 MPH).
5.
Press SET/COAST switch.
6.
EC-593, "Diagnostic Procedure"
.
WITH GST
Follow the procedure “WITH CONSULT-II” above.
Diagnostic Procedure
NBS0024B
1.
REPLACE ICC UNIT
1.
Replace ICC unit.
2.
Perform
3.
Check DTC of ICC unit. Refer to
ACS-43, "TROUBLE DIAGNOSIS FOR SELF-DIAGNOSTIC ITEMS"
>> INSPECTION END
DTC No.
Trouble Diagnosis
Name
DTC Detecting Condition
Possible Cause
P1568
1568
ICC function
ECM detects a difference between signals
from ICC unit is out of specified range.
●
Harness or connectors
(The CAN communication line is open or
shorted.)
●
ICC unit
●
ECM
SEF058Y
EC-594
DTC P1572 ICC BRAKE SWITCH
DTC P1572 ICC BRAKE SWITCH
PFP:25320
Component Description
NBS0024C
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.
CONSULT-II Reference Value in Data Monitor Mode
NBS0024D
Specification data are reference values.
On Board Diagnosis Logic
NBS0024E
This diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
●
If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605.
Refer to
.
●
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.
PBIB2433E
MONITOR ITEM
CONDITION
SPECIFICATION
BRAKE SW1
(ICC brake switch)
●
Ignition switch: ON
Brake pedal: Fully released
ON
Brake pedal: Slightly depressed
OFF
BRAKE SW2
(stop lamp switch)
●
Ignition switch: ON
Brake pedal: Fully released
OFF
Brake pedal: Slightly depressed
ON
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1572
1572
ICC brake switch
A)
When the vehicle speed is above 30 km/h
(19 MPH), 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
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ICC brake switch
●
ICC brake hold relay
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Incorrect stop lamp switch installation
●
Incorrect ICC brake switch installation
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ECM
B)
ICC brake switch signal is not sent to ECM
for extremely long time while the vehicle is
driving
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