Infiniti I35 (A33). Manual — part 319
3
CHECK ASCD STEERING SWITCH GROUND CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Disconnect ECM harness connector.
3. Disconnect ASCD steering harness connector.
4. Check harness continuity between switch terminal 2 and ECM terminal 58. Refer to Wiring Diagram.
SEC198D
Continuity should exist.
5. Also check harness for short to power.
OK or NG
OK
©
GO TO 5.
NG
©
GO TO 4.
4
DETECT MALFUNCTIONING PART
Check the following.
I
Harness connectors M223, F53
I
Joint connector-20
I
Combination switch (spiral cable)
I
Harness for open and short between ECM and ASCD steering switch
©
Repair open circuit or short to power in harness or connectors.
5
CHECK ASCD STEERING SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check harness continuity between ECM terminal 50 and ASCD steering switch terminal 1.
Refer to Wiring Diagram.
Continuity should exist.
3. 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.
I
Harness connectors M223, F53
I
Combination switch (spiral cable)
I
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.
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1564 ASCD STEERING SWITCH
Diagnostic Procedure (Cont’d)
EC-617
7
CHECK ASCD STEERING SWITCH
Refer to “Component Inspection”, EC-618.
OK or NG
OK
©
GO TO 8.
NG
©
Replace ASCD steering switch.
8
CHECK INTERMITTENT INCIDENT
Refer to “TROUBLE DIAGNOSIS FOR INTERMITTENT INCIDENT”, EC-152.
©
INSPECTION END
SEC008D
Component Inspection
NHEC1215
ASCD STEERING SWITCH
1.
Disconnect ASCD steering switch.
2.
Check continuity between terminals 1 and 2 by pushing each
switch.
Switch
Condition
Resistance [
Ω
]
MAIN SW
Pressed
Approx. 0
Released
Approx. 4,000
SET/COAST SW
Pressed
Approx. 660
Released
Approx. 4,000
RESUME/ACCEL SW
Pressed
Approx. 1,480
Released
Approx. 4,000
CANCEL SW
Pressed
Approx. 250
Released
Approx. 4,000
DTC P1564 ASCD STEERING SWITCH
Diagnostic Procedure (Cont’d)
EC-618
SEC009DA
Component Description
NHEC1466
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-54 for the ASCD function.
CONSULT-II Reference Value in Data Monitor
Mode
NHEC1217
Specification data are reference values.
MONITOR ITEM
CONDITION
SPECIFICATION
BRAKE SW 1
(ASCD brake switch)
I
Ignition switch: ON
I
Shift lever: Except N and P
position
I
Brake pedal: Released
ON
I
Brake pedal: Depressed
OFF
BRAKE SW 2
(Stop lamp switch)
I
Ignition switch: ON
I
Brake pedal: Released
OFF
I
Brake pedal: Depressed
ON
On Board Diagnosis Procedure
NHEC1467
This self-diagnosis has the one trip detection logic.
The MIL will not light up for this self-diagnosis.
NOTE:
I
If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-442.
I
If DTC P1572 is displayed with DTC P1805, first perform the trouble diagnosis for DTC P1805. Refer
to EC-644.
DTC
Trouble diagnosis name
DTC Detecting Condition
Possible cause
P1572
1572
ASCD brake switch
I
When the vehicle speed is above
30 km/h (19 MPH), ON signal
from the stop lamp switch and
ASCD brake switch are sent to the
ECM at the same time.
I
ASCD brake switch signal is not
sent to ECM for an extremely long
time while driving vehicle.
I
Harness or connectors
(The stop lamp switch circuit is
open or shorted.)
I
Harness or connectors
(The ASCD brake switch circuit is
open or shorted.)
I
ASCD brake switch
I
Stop lamp switch
I
Harness or connectors
(The ASCD brake switch or stop
lamp switch circuit is open or
shorted.)
I
Incorrect stop lamp switch installa-
tion
I
Incorrect ASCD brake switch
installation
I
ECM
GI
MA
EM
LC
FE
AT
AX
SU
BR
ST
RS
BT
HA
SC
EL
IDX
DTC P1572 ASCD BRAKE SWITCH
Component Description
EC-619
DTC Confirmation Procedure
NHEC1468
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:
Steps 3 and 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.
SEC010D
With CONSULT-II
1)
Start engine (TCS switch or VDC switch OFF).
2)
Select “DATA MONITOR” mode with CONSULT-II.
3)
Drive the vehicle for at least 5 consecutive seconds under the
following condition.
VHCL SPEED SE
More than 30 km/h (19 MPH)
Selector lever
Suitable position
If DTC is detected, go to “Diagnostic Procedure”, EC-623.
If DTC is not detected, go to the following step.
4)
Drive the vehicle for at least 5 consecutive seconds under the
following condition.
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 condi-
tion.
5)
If DTC is detected, go to “Diagnostic Procedure”, EC-623.
With GST
Follow the procedure “With CONSULT-II” above.
DTC P1572 ASCD BRAKE SWITCH
DTC Confirmation Procedure
EC-620
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