Infiniti QX56 (JA60). Manual — part 937
TM-50
< COMPONENT DIAGNOSIS >
P0720 OUTPUT SPEED SENSOR
P0720 OUTPUT SPEED SENSOR
Description
INFOID:0000000005148556
The output speed sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse sig-
nal. The pulse signal is sent to the TCM which converts it into vehicle speed.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000005148557
On Board Diagnosis Logic
INFOID:0000000005148558
• This is an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0720 OUTPUT SPEED SENSOR” with CONSULT-III is detected under the follow-
ing conditions.
- When TCM does not receive the proper voltage signal from the sensor.
- After ignition switch is turned “ON”, irregular signal input from vehicle speed signal before the vehicle starts
moving.
Possible Cause
INFOID:0000000005148559
• Harness or connectors
(The sensor circuit is open or shorted.)
• Output speed sensor
• Vehicle speed signal
DTC Confirmation Procedure
INFOID:0000000005148560
CAUTION:
• Always drive vehicle at a safe speed.
• Be careful not to rev engine into the red zone on the tachometer.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch “ON”. (Do not start engine.)
2. Select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Drive vehicle and check for an increase of “VHCL/S SE-A/T” value in response to “VHCL/S SE-MTR”
value.
If the check result is NG, go to
If the check result is OK, go to following step.
4. Select “DATA MONITOR” mode for “ENGINE” with CONSULT-III.
5. Start engine and maintain the following conditions for at least 5 consecutive seconds.
VHCL/S SE-A/T: 30 km/h (19 MPH) or more
ACCELE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
If the check result is NG, go to
If the check result is OK, go to following step.
6. Maintain the following conditions for at least 5 consecutive seconds.
ENGINE SPEED: 3,500 rpm or more
ACCELE POSI: More than 1.0/8
SLCT LVR POSI: “D” position
Driving location: Driving the vehicle uphill (increased engine load) will help maintain the driving
conditions required for this test.
If the check result is NG, go to
Item name
Condition
Display value (km/h)
VHCL/S SE-A/T
During driving
Approximately matches the speedometer reading.
P0720 OUTPUT SPEED SENSOR
TM-51
< COMPONENT DIAGNOSIS >
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WITH GST
Follow the procedure “With CONSULT-III”.
Diagnosis Procedure
INFOID:0000000005148561
1.
CHECK INPUT SIGNAL
With CONSULT-III
1. Turn ignition switch “ON”.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. Start the engine.
4. Read out the value of “VHCL/S SE·A/T” while driving.
Check the value changes according to driving speed.
OK or NG
OK
>> GO TO 6.
NG
>> GO TO 2.
2.
CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to
OK or NG
OK
>> GO TO 3.
NG
>> Repair or replace damaged parts.
3.
DETECT MALFUNCTIONING ITEM
Check the following items:
• The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.
OK or NG
OK
>> GO TO 4.
NG
>> Repair or replace damaged parts.
4.
CHECK SUB-HARNESS
1. Remove control valve with TCM. Refer to
TM-172, "Control Valve with TCM and A/T Fluid Temperature
2. Disconnect transmission range switch connector and TCM connector.
3. Check continuity between transmission range switch connector
(A) terminals and TCM connector (B) terminals.
4. If OK, check harness for short to ground and short to power.
5. Reinstall any part removed.
OK or NG
OK
>> GO TO 5.
NG
>> Replace open circuit or short to ground and short to power in harness or connectors.
Item name
Condition
Display value (km/h)
VHCL/S SE-A/T
During driving
Approximately matches the speedometer reading.
Item
Connector Terminal
Continuity
Transmission range switch
connector
F505
8
Yes
TCM connector
F503
20
Transmission range switch
connector
F505
9
Yes
TCM connector
F503
17
Transmission range switch
connector
F505
10
Yes
TCM connector
F503
16
JSDIA1329GB
TM-52
< COMPONENT DIAGNOSIS >
P0720 OUTPUT SPEED SENSOR
5.
REPLACE THE OUTPUT SPEED SENSOR AND CHECK DTC
1. Replace the output speed sensor. Refer to
.
2. Perform “DTC Confirmation Procedure”. Refer to
TM-50, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> Replace the control valve with TCM. Refer to
TM-172, "Control Valve with TCM and A/T Fluid
Temperature Sensor 2 and Plug"
6.
CHECK DTC
Perform “DTC Confirmation Procedure”.
• Refer to
TM-50, "DTC Confirmation Procedure"
OK or NG
OK
>> INSPECTION END
NG
>> GO TO 2.
P0725 ENGINE SPEED
TM-53
< COMPONENT DIAGNOSIS >
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P0725 ENGINE SPEED
Description
INFOID:0000000005148562
The engine speed signal is sent from the ECM to the TCM.
CONSULT-III Reference Value in Data Monitor Mode
INFOID:0000000005148563
On Board Diagnosis Logic
INFOID:0000000005148564
• This is not an OBD-II self-diagnostic item.
• Diagnostic trouble code “P0725 ENGINE SPEED” with CONSULT-III is detected when TCM does not
receive the ignition signal from ECM during engine cranking or running.
Possible Cause
INFOID:0000000005148565
Harness or connectors
(The ECM to the TCM circuit is open or shorted.)
DTC Confirmation Procedure
INFOID:0000000005148566
CAUTION:
Always drive vehicle at a safe speed.
NOTE:
If “DTC Confirmation Procedure” has been previously performed, always turn ignition switch “OFF”
and wait at least 10 seconds before performing the next test.
After the repair, perform the following procedure to confirm the malfunction is eliminated.
WITH CONSULT-III
1. Turn ignition switch “ON” and select “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
2. Start engine and maintain the following conditions for at least 10 consecutive seconds.
VHCL/S SE-A/T: 10 km/h (6 MPH) or more
ACCELE POSI: More than 1/8
SLCT LVR POSI: “D” position
3. If DTC is detected, go to
Diagnosis Procedure
INFOID:0000000005148567
1.
CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to
TM-32, "CONSULT-III Function (TRANSMISSION)"
Is a malfunction in the CAN communication indicated in the results?
YES
>> Check CAN communication line. Refer to
.
NO
>> GO TO 2.
2.
CHECK DTC WITH TCM
With CONSULT-III
1. Start engine.
2. Select “ECU INPUT SIGNALS” in “DATA MONITOR” mode for “TRANSMISSION” with CONSULT-III.
3. While monitoring engine speed, check for engine speed change corresponding to wide-open throttle posi-
tion signal.
OK or NG
OK
>> GO TO 3.
Item name
Condition
Display value (rpm)
ENGINE SPEED
Engine running
Closely matches the tachometer reading.
Item name
Condition
Display value (rpm)
ENGINE SPEED
Engine running
Closely matches the tachometer reading.
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