Infiniti Q45. Manual — part 491
DTC P1572 ICC BRAKE SWITCH
EC-603
C
D
E
F
G
H
I
J
K
L
M
A
EC
STOP LAMP SWITCH
1.
Turn ignition switch OFF.
2.
Disconnect stop lamp switch harness connector.
3.
Check continuity between stop lamp switch terminals 3 and 4
under the following conditions.
If NG, adjust stop lamp switch installation, refer to
ICC BRAKE HOLD RELAY
1.
Apply 12V direct current between ICC brake hold relay terminals 1 and 2.
2.
Check continuity between relay terminals 3 and 4, 6 and 7 under
the following conditions.
3.
If NG, replace ICC brake hold relay.
Condition
Continuity
When brake pedal: Fully released.
Should not exist.
When brake pedal: Slightly depressed.
Should exist.
PBIB2103E
Condition
Between terminals
Continuity
12V direct current supply
between terminals 1 and 2
3 and 4
Should not exist
6 and 7
Should exist
No current supply
3 and 4
Should exist
6 and 7
Should not exist
MBIB0063E
EC-604
DTC P1572 ASCD BRAKE SWITCH
DTC P1572 ASCD BRAKE SWITCH
PFP:25320
Component Description
NBS0024J
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 this input of two kinds (ON/OFF signal).
Refer to
EC-29, "AUTOMATIC SPEED CONTROL DEVICE (ASCD)"
for the ASCD function.
CONSULT-II Reference Value in Data Monitor Mode
NBS0024K
Specification data are reference values.
On Board Diagnosis Logic
NBS0024L
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this diagnosis.
NOTE:
●
If DTC P 1572 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
(ASCD 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
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
vehicle is driving.
DTC P1572 ASCD BRAKE SWITCH
EC-605
C
D
E
F
G
H
I
J
K
L
M
A
EC
DTC Confirmation Procedure
NBS0024M
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.
●
Procedure for malfunction B is not described here. It takes extremely long time to complete procedure for
malfunction B. By performing procedure for malfunction A, the incident that causes malfunction B can be
detected.
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.
WITH CONSULT-II
1.
Start engine (VDC switch OFF).
2.
Select “DATA MONITOR” mode with CONSULT-II.
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.
If 1st trip DTC is detected, go to
EC-607, "Diagnostic Procedure"
.
If 1st trip DTC is not detected, go to the following step.
5.
Drive the vehicle for at least 5 consecutive seconds under the following conditions.
6.
If 1st trip DTC is detected, go to
EC-607, "Diagnostic Procedure"
WITH GST
Follow the procedure “WITH CONSULT-II” above.
VHCL SPEED SE
More than 30 km/h (19 MPH)
Selector lever
Suitable position
PBIB2386E
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.
EC-606
DTC P1572 ASCD BRAKE SWITCH
Wiring Diagram
NBS0024N
TBWM1248E
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