NISSAN TIIDA 2007 Service Repair Manual

EC-932
< COMPONENT DIAGNOSIS >[MR18DE]
P1564 ASCD STEERING SWITCH
1. Check the continuity between ECM harness connector and ASCD steering switch.
2. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> GO TO 6.
6.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors M69, E7
 Combination switch (spiral cable)
 Harness for open and short between ECM and combination switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK ASCD STEERING SWITCH
Refer to EC-932, "
Component Inspection".
Is the inspection result normal?
YES >> GO TO 8.
NO >> Replace ASCD steering switch.
8.CHECK INTERMITTENT INCIDENT
Refer to GI-55, "
Intermittent Incident".
>> INSPECTION END
Component InspectionINFOID:0000000001161912
1.CHECK ASCD STEERING SWITCH
1. Disconnect combination switch (spiral cable) harness connector.
2. Check the continuity between combination switch harness connector terminals under following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace ASCD steering switch
Combination switch ECM
Continuity
Terminal Connector Terminal
14 E16 94 Existed
Combination meter
Condition Resistance
Connector Terminals
M30 14 and 15MAIN switch: Pressed Approx. 0 Ω
CANCEL switch: Pressed Approx. 250 Ω
SET/COAST switch: Pressed Approx. 660 Ω
RESUME/ACCELERATE switch: Pressed Approx. 1,480 Ω
All ASCD steering switches: Released Approx. 4,000 Ω

P1572 ASCD BRAKE SWITCH
EC-933
< COMPONENT DIAGNOSIS >[MR18DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
P1572 ASCD BRAKE SWITCH
DescriptionINFOID:0000000001161913
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-728, "
System Description" for the ASCD function.
DTC LogicINFOID:0000000001161914
DTC DETECTION LOGIC
NOTE:
If DTC P1572 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-880, "
DTC Logic".
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 turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
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 FOR MALFUNCTION A-I
With CONSULT-III
1. Start engine.
2. Select “DATA MONITOR” mode with CONSULT-III.
3. Press MAIN switch and make sure that CRUISE indicator is displayed in combination meter.
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
nameDTC detecting condition Possible cause
P1572 ASCD brake switchA)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.)
 Harness or connectors
(The ASCD clutch switch circuit is shorted.)
 Stop lamp switch
 ASCD brake switch
 ASCD clutch switch
 Incorrect stop lamp switch installation
 Incorrect ASCD brake switch installation
 Incorrect ASCD clutch switch installation
ECM B)ASCD brake switch signal is not sent to
ECM for extremely long time while the ve-
hicle is driving.

EC-934
< COMPONENT DIAGNOSIS >[MR18DE]
P1572 ASCD BRAKE SWITCH
5. Check 1st trip DTC.
With GST
Follow the procedure “With CONSULT-III” above.
Is 1st trip DTC detected?
YES >> Go to EC-934, "Diagnosis Procedure".
NO >> GO TO 3.
3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A-II
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.
Is 1st trip DTC detected?
YES >> Go to EC-934, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000001610402
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 terminal 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)
Shift lever Suitable position
VHCL SPEED SE More than 30 km/h (19 mph)
Selector lever Suitable position
Driving locationDepress 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 and clutch pedalSlightly depressed OFF
Fully released ON
(+) (−)
Condition Voltage
Connector Terminal Connector Terminal
E16100
(ASCD brake switch signal)E16 108 Brake pedal Slightly depressed Approx. 0V
Fully released Battery voltage

P1572 ASCD BRAKE SWITCH
EC-935
< COMPONENT DIAGNOSIS >[MR18DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
With CONSULT-III
Select “BRAKE SW2” and check indication in “DATA MONITOR” mode.
Without CONSULT-III
Check the voltage between ECM harness connector terminal as follows.
Is the inspection result normal?
YES >> GO TO 16.
NO >> GO TO 11.
3.CHECK ASCD BRAKE SWITCH CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect ASCD cluch switch harness connector.
3. Turn ignition switch ON.
4. Check the voltage between ASCD cluch switch harness connector and ground.
Is the inspection result normal?
YES >> GO TO 8.
NO >> GO TO 4.
4.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 6.
NO >> GO TO 5.
5.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors E7, M69 (LHD models)
 Harness connectors M201, M25 (RHD models)
 10A fuse (No.2)
 Harness for open or short between ASCD brake switch and fuse
Monitor item Condition Indication
BRAKE SW2 Brake pedalSlightly depressed ON
Fully released OFF
(+) (−)
Condition Voltage
Connector Terminal Connector Terminal
E1699
(Stop lamp switch signal)E108 108 Brake pedalSlightly depressed Approx. 0V
Fully released Battery voltage
ASCD Clutch switch
Ground Condition Voltage (V)
Connector Terminal
E35 (LHD models)
M206 (RHD models)1 Ground Brake pedalSlightly depressed Approx. 0
Fully released Battery voltage
ASCD brake switch
Ground Voltage
Connector Terminal
E36 (LHD models)
M205 (RHD models)1 Ground Battery voltage

EC-936
< COMPONENT DIAGNOSIS >[MR18DE]
P1572 ASCD BRAKE SWITCH
>> Repair open circuit or short to ground or short to power in harness or connectors.
6.CHECK ASCD BRAKE SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Turn ignition switch OFF.
2. Check the continuity between ASCD brake switch harness connector and ASCD clutch switch harness
connector.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 7.
NO >> Repair open circuit or short to ground or short to power in harness or connectors.
7.CHECK ASCD BRAKE SWITCH
Refer to EC-966, "
Component Inspection (ASCD Brake Switch)".
Is the inspection result normal?
YES >> GO TO 16.
NO >> Replace ASCD brake switch.
8.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 ECM harness connector and ASCD cluch switch harness connector.
4. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 10.
NO >> GO TO 9.
9.DETECT MALFUNCTIONING PART
Check the following.
 Harness connector E7, M69, M201, M25 (RHD models)
 Harness for open or short between ECM and ASCD clutch switch
>> Repair open circuit or short to ground or short to power in harness or connectors.
10.CHECK ASCD CLUTCH SWITCH
Refer to EC-966, "
Component Inspection (ASCD Clutch Switch)".
Is the inspection result normal?
YES >> GO TO 16.
NO >> Replace ASCD clutch switch.
11 .CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect stop lamp switch harness connector.
3. Check the voltage between stop lamp switch harness connector and ground.
ASCD brake switch ASCD clutch switch
Continuity
Connector Terminal Connector Terminal
E36 (LHD models)
M205 (RHD models)2E35 (LHD models)
M206 (RHD models)1 Existed
ECM ASCD cluch switch
Continuity
Connector Terminal Connector Terminal
E16 100E35 (LHD models)
M206 (RHD models)2Existed

P1572 ASCD BRAKE SWITCH
EC-937
< COMPONENT DIAGNOSIS >[MR18DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
Is the inspection result normal?
YES >> GO TO 13.
NO >> GO TO 12.
12.DETECT MALFUNCTIONING PART
Check the following.
 Harness connectors M69, E7 (LHD models)
 Harness connectors M25, M201 (RHD models)
 10A fuse (No.7)
 Harness for open or short between stop lamp switch and battery
>> Repair open circuit or short to ground or short to power in harness or connectors.
13.CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1. Disconnect ECM harness connector.
2. Check the continuity between ECM harness connector and stop lamp switch harness connector.
3. Also check harness for short to ground and short to power.
Is the inspection result normal?
YES >> GO TO 15.
NG >> GO TO 14.
14.DETECT MALFUNCTIONING PART
Check the following.
 Harness connector E7, M69, M201, M25 (RHD models)
 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.
15.CHECK STOP LAMP SWITCH
Refer to EC-946, "
Component Inspection (Stop Lamp Switch)".
Is the inspection result normal?
YES >> GO TO 16.
NO >> Replace stop lamp switch.
16.CHECK INTERMITTENT INCIDENT
Refer to GI-55, "
Intermittent Incident".
>> INSPECTION END
Component Inspection (ASCD Brake Switch)INFOID:0000000001161916
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.
Stop lamp switch
Ground Voltage
Connector Terminal
E13 (LHD models)
M203 (RHD models)1 Ground Battery voltage
ECM Stop lamp switch
Continuity
Connector Terminal Connector Terminal
E16 99E13 (LHD models)
M203 (RHD models)2 Existed

EC-938
< COMPONENT DIAGNOSIS >[MR18DE]
P1572 ASCD BRAKE SWITCH
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-6, "
Inspection and Adjustment".
2. Check the continuity between ASCD brake switch terminals under the following conditions.
Is the inspection result normal?
YES >> INSPECTION END
NO >> Replace ASCD brake switch.
Component Inspection (ASCD Clutch Switch)INFOID:0000000001161917
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, "
On-vehicle 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:0000000001161918
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.
Terminals Condition Continuity
1 and 2 Brake pedalFully released Existed
Slightly depressed Not existed
Terminals Condition Continuity
1 and 2 Brake pedalFully released Existed
Slightly depressed Not existed
Terminals Condition Continuity
1 and 2 Clutch pedalFully released Existed
Slightly depressed Not existed
Terminals Condition Continuity
1 and 2 Clutch pedalFully released Existed
Slightly depressed Not existed

P1572 ASCD BRAKE SWITCH
EC-939
< COMPONENT DIAGNOSIS >[MR18DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
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-6, "
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 Brake pedalFully released Not existed
Slightly depressed Existed
Terminals Condition Continuity
1 and 2 Brake pedalFully released Not existed
Slightly depressed Existed

EC-940
< COMPONENT DIAGNOSIS >[MR18DE]
P1574 ASCD VEHICLE SPEED SENSOR
P1574 ASCD VEHICLE SPEED SENSOR
DescriptionINFOID:0000000001161919
The ECM receives two vehicle speed sensor signals via CAN communication line. One is sent from combina-
tion meter, and the other is from TCM (Transmission control module). The ECM uses these signals for ASCD
control. Refer to EC-728, "
System Description" for ASCD functions.
DTC LogicINFOID:0000000001161920
DTC DETECTION LOGIC
NOTE:
If DTC P1574 is displayed with DTC U1000, U1001, first perform the trouble diagnosis for DTC U1000,
U1001. Refer to EC-793, "
DTC Logic".
If DTC P1574 is displayed with DTC U1010, first perform the trouble diagnosis for DTC U1010. Refer
to EC-794, "
DTC Logic".
If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
to EC-878, "
DTC Logic"
If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
to EC-880, "
DTC Logic"
DTC CONFIRMATION PROCEDURE
1.PRECONDITIONING
If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 10 seconds before conducting the next test.
>> GO TO 2.
2.PERFORM DTC CONFIRMATION PROCEDURE
1. Start engine.
2. Drive the vehicle at more than 40 km/h (25 MPH).
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.
3. Check DTC.
Is DTC detected?
YES >> Go to EC-940, "Diagnosis Procedure".
NO >> INSPECTION END
Diagnosis ProcedureINFOID:0000000001161921
1.CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
Refer to BRC-105, "
CONSULT-III Function (ABS)".
Is the inspection result normal?
YES >> GO TO 2.
DTC No.Trouble diagnosis
nameDTC detecting condition Possible cause
P1574ASCD vehicle speed
sensorECM detects a difference between two vehicle
speed signals is out of the specified range. Harness or connectors
(The CAN communication line is open or
shorted.)
(Combination meter circuit is open or shorted.)
 Combination meter
 ABS actuator and electric unit (control unit)
 Wheel sensor
ECM

P1574 ASCD VEHICLE SPEED SENSOR
EC-941
< COMPONENT DIAGNOSIS >[MR18DE]
C
D
E
F
G
H
I
J
K
L
MA
EC
N
P O
NO >> Repair or replace.
2.CHECK COMBINATION METER
Check combination meter function.
Refer to MWI-22, "
CONSULT-III Function (METER/M&A)".
>> INSPECTION END