Infiniti QX56 (JA60). Manual — part 276
P1807 VEHICLE SPEED SENSOR (A/T)
DLN-27
< COMPONENT DIAGNOSIS >
[ATX14B]
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P1807 VEHICLE SPEED SENSOR (A/T)
Description
INFOID:0000000005148782
The transmission control module (TCM) transmits the output shaft revolution signal via CAN communication to
Transfer control unit. DTC P1807 will set when a malfunction is detected in the output shaft revolution signal
or an improper signal is input while driving.
DTC Logic
INFOID:0000000005148783
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1807 detected?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005148784
1.
CHECK DTC WITH TCM
Perform self-diagnosis with TCM. Refer to
TM-32, "CONSULT-III Function (TRANSMISSION)"
.
Is any malfunction detected by self-diagnosis?
YES
>> Check the malfunctioning system.
NO
>> GO TO 2.
2.
CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to
Are the inspection results normal?
YES
>> GO TO 3.
NO
>> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.
CHECK DTC
Drive the vehicle and then perform self-diagnosis.
Are the inspection results normal?
YES
>> Inspection End.
NO
>> Perform self-diagnosis with TCM again.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1807]
VHCL SPEED SEN·AT
• Malfunction is detected in output shaft
revolution signal that is output from
TCM through CAN communication.
• Improper signal is input while driving.
DLN-28
< COMPONENT DIAGNOSIS >
[ATX14B]
P1808 VEHICLE SPEED SENSOR (ABS)
P1808 VEHICLE SPEED SENSOR (ABS)
Description
INFOID:0000000005148785
The ABS actuator and electric unit (control unit) transmits a vehicle speed signal via CAN communication to
the transfer control unit. DTC P1808 sets when a malfunction is detected in the vehicle speed signal that is
output from the ABS actuator and electric unit (control unit) or an improper signal is input while driving.
DTC Logic
INFOID:0000000005148786
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1808 displayed?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005148787
1.
CHECK DTC WITH ABS ACTUATOR AND ELECTRIC UNIT (CONTROL UNIT)
Perform self-diagnosis with ABS actuator and electric unit (control unit). Refer to
.
Is any malfunction detected by self-diagnosis?
YES
>> Check the malfunctioning system.
NO
>> GO TO 2.
2.
CHECK TRANSFER CONTROL UNIT
Check transfer control unit input/output signal. Refer to
Are the inspection results normal?
YES
>> GO TO 3.
NO
>> Check transfer control unit pin terminals for damage or loose connection with harness connector.
If any items are damaged, repair or replace damaged parts.
3.
CHECK DTC
Perform the self-diagnosis, after driving a vehicle for a while.
Are the inspection results normal?
YES
>> Inspection End.
NO
>> Perform self-diagnosis with ABS actuator and electric unit (control unit) again.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1808]
VHCL SPEED SEN·ABS
• Malfunction is detected in vehicle
speed signal that is output from ABS
actuator and electric unit (control unit)
through CAN communication.
• Improper signal is input while driving.
Refer to
.
P1810 NEUTRAL-4LO SWITCH
DLN-29
< COMPONENT DIAGNOSIS >
[ATX14B]
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P1810 NEUTRAL-4LO SWITCH
Description
INFOID:0000000005148788
The neutral-4LO switch detects that the transfer case is in neutral or 4LO range. DTC P1810 will set when an
improper signal from the neutral-4LO switch is input due to an open or short circuit.
DTC Logic
INFOID:0000000005148789
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
DTC CONFIRMATION PROCEDURE
1. Turn ignition switch ON.
2. Perform self-diagnosis.
Is DTC P1810 displayed?
YES
>> Perform diagnosis procedure. Refer to
.
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005148790
Regarding Wiring Diagram information, refer to
DLN-89, "Wiring Diagram - ALL-MODE 4WD SYSTEM -"
.
1.
CHECK 4LO POSITION SWITCH SIGNAL
With CONSULT-III
1. Start engine.
2. Select DATA MONITOR mode for ALL MODE AWD/4WD with CONSULT-III.
3. Read out the value of N POSI SW TF.
Without CONSULT-III
1. Start engine.
DTC
CONSULT-III
Diagnostic item is detected when...
Reference
[P1810]
4L POSI SW TF
Improper signal from neutral-4LO switch
is input due to open or short circuit.
Condition
Display value
• Vehicle stopped
• Engine running
• A/T selector lever N position
• Brake pedal depressed
4WD shift switch: 2WD,
AUTO or 4H
OFF
4WD shift switch: 4H to
4LO (While actuator mo-
tor is operating.)
OFF
→ ON
4WD shift switch: 4LO to
4H (While actuator motor
is operating.)
ON
→ OFF
4WD shift switch: 4LO
ON
DLN-30
< COMPONENT DIAGNOSIS >
[ATX14B]
P1810 NEUTRAL-4LO SWITCH
2. Check voltage between transfer control unit harness connector
terminal and ground.
Are inspection results normal?
YES
>> GO TO 5.
NO
>> GO TO 2.
2.
CHECK HARNESS BETWEEN TRANSFER CONTROL UNIT AND NEUTRAL-4LO SWITCH
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect transfer control unit harness connector and the neutral-4LO switch harness connector.
3. Check continuity between transfer control unit harness connec-
tor E143 terminal 25 and neutral-4LO switch harness connector
F60 terminal 13.
Also check harness for short to ground and short to power.
Are inspection results normal?
YES
>> GO TO 3.
NO
>> Repair or replace damaged parts.
3.
CHECK GROUND CIRCUIT
1. Turn ignition switch OFF. (Stay for at least 5 seconds.)
2. Disconnect neutral-4LO switch harness connector.
3. Check continuity between neutral-4LO switch harness connec-
tor F60 terminal 12 and ground.
Also check harness for short to ground and short to power.
Are inspection results normal?
YES
>> GO TO 4.
NO
>> Repair open circuit or short to ground or short to power
in harness or connectors.
4.
CHECK 4LO SWITCH
1. Turn ignition switch OFF.
2. Disconnect neutral-4LO switch harness connector.
3. Remove neutral-4LO switch.
Connector
Terminal
(Wire col-
or)
Condition
Voltage
(Approx.)
E143
25 -
Ground
• Vehicle stopped
• Engine running
• A/T selector lever
N position
• Brake pedal de-
pressed
4WD shift switch:
2WD, AUTO or 4H
Battery
voltage
4WD shift switch: 4H to
4LO (While actuator
motor is operating.)
Battery
voltage
→ 0V
4WD shift switch: 4LO
to 4H (While actuator
motor is operating.)
0V
→
Battery
voltage
4WD shift switch: 4LO
0V
SDIA2693E
Continuity should exist.
SDIA2694E
Continuity should exist.
SDIA2695E
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