Infiniti FX35, FX50 (S51). Manual — part 724
P1574 ICC VEHICLE SPEED SENSOR
EC-437
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P1574 ICC VEHICLE SPEED SENSOR
Description
INFOID:0000000005237044
The ECM receives two vehicle speed signals via CAN communication line. One is sent from “unified meter and
A/C amp.”, and the other is from TCM (Transmission control module). The ECM uses these signals for ICC
control. Refer to
for ICC functions.
DTC Logic
INFOID:0000000005237045
DTC DETECTION LOGIC
NOTE:
• If DTC P1574 is displayed with DTC UXXXX, first perform the trouble diagnosis for DTC UXXXX.
• If DTC P1574 is displayed with DTC P0500, first perform the trouble diagnosis for DTC P0500. Refer
.
• If DTC P1574 is displayed with DTC P0605, first perform the trouble diagnosis for DTC P0605. Refer
.
• If DTC P1574 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.
>> GO TO 2.
2.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Start engine (VDC switch OFF).
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
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237046
1.
CHECK DTC WITH TCM
Check DTC with TCM. Refer to
TM-61, "Diagnosis Description"
Is the inspection result normal?
DTC No.
Trouble diagnosis
name
DTC detecting condition
Possible cause
P1574
ICC vehicle speed
sensor
ECM 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.)
• Unified meter and A/C amp.
• ABS actuator and electric unit (control unit)
• Wheel sensor
• TCM
• ECM
EC-438
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P1574 ICC VEHICLE SPEED SENSOR
YES
>> GO TO 2.
NO
>> Perform troubleshooting relevant to DTC indicated.
2.
CHECK DTC WITH “ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)”
BRC-44, "CONSULT-III Function"
.
Is the inspection result normal?
YES
>> GO TO 3.
NO
>> Repair or replace malfunctioning part.
3.
CHECK DTC WITH “UNIFIED METER AND A/C AMP.”
Check combination meter function.
Refer to
MWI-45, "CONSULT-III Function (METER/M&A)"
.
>> INSPECTION END
P1805 BRAKE SWITCH
EC-439
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
C
D
E
F
G
H
I
J
K
L
M
A
EC
N
P
O
P1805 BRAKE SWITCH
Description
INFOID:0000000005237047
Brake switch signal is applied to the ECM through the stop lamp switch when the brake pedal is depressed.
This signal is used mainly to decrease the engine speed when the vehicle is being driven.
DTC Logic
INFOID:0000000005237048
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
PERFORM DTC CONFIRMATION PROCEDURE
1.
Turn ignition switch ON.
2.
Fully depress the brake pedal for at least 5 seconds.
3.
Erase the DTC.
4.
Check 1st trip DTC.
Is 1st trip DTC detected?
YES
>> Go to
NO
>> INSPECTION END
Diagnosis Procedure
INFOID:0000000005237049
1.
CHECK STOP LAMP SWITCH CIRCUIT
1.
Turn ignition switch OFF.
2.
Check the stop lamp illumination under the following conditions.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 2.
2.
CHECK STOP LAMP SWITCH POWER SUPPLY CIRCUIT
1.
Disconnect stop lamp switch harness connector.
2.
Check the voltage between stop lamp switch harness connector and ground.
Is the inspection result normal?
YES
>> GO TO 4.
NO
>> GO TO 3.
3.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103
• 10 A fuse (No. 7)
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
P1805
Brake switch
A brake switch signal is not sent to ECM for ex-
tremely long time while the vehicle is being driv-
en.
• Harness or connectors
(Stop lamp switch circuit is open or short-
ed.)
• Stop lamp switch
Condition
Stop lamp
Brake pedal
Fully released
Not illuminated
Slightly depressed
Illuminated
Stop lamp switch
Ground
Voltage
Connector
Terminal
E110
1
Ground
Battery voltage
EC-440
< DTC/CIRCUIT DIAGNOSIS >
[VQ35HR]
P1805 BRAKE SWITCH
• Harness for open or short between stop lamp switch and battery
>> Repair open circuit, short to ground or short to power in harness or connectors.
4.
CHECK STOP LAMP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT
1.
Disconnect stop lamp switch harness connector.
2.
Disconnect ECM harness connector.
3.
Check the continuity between stop lamp 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 6.
NO
>> GO TO 5.
5.
DETECT MALFUNCTIONING PART
Check the following.
• Fuse block (J/B) connector E103, M2
• Harness for open or short between ECM and stop lamp switch
>> Repair open circuit, short to ground or short to power in harness or connectors.
6.
CHECK STOP LAMP SWITCH
EC-440, "Component Inspection (Stop Lamp Switch)"
.
Is the inspection result normal?
YES
>> GO TO 7.
NO
>> Replace stop lamp switch.
7.
CHECK INTERMITTENT INCIDENT
GI-36, "Intermittent Incident"
>> INSPECTION END
Component Inspection (Stop Lamp Switch)
INFOID:0000000005237050
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.
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-7, "Inspection and Adjustment"
2.
Check the continuity between stop lamp switch terminals under the following conditions.
Stop lamp switch
ECM
Continuity
Connector
Terminal
Connector
Terminal
E110
2
M107
122
Existed
Terminals
Condition
Continuity
1 and 2
Brake pedal
Fully released
Not existed
Slightly depressed
Existed
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст