Infiniti QX56 (JA60). Manual - part 937

TM-50

< COMPONENT DIAGNOSIS >

P0720 OUTPUT SPEED SENSOR

P0720 OUTPUT SPEED SENSOR

Description

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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

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On Board Diagnosis Logic

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• 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

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• Harness or connectors

(The sensor circuit is open or shorted.)

• Output speed sensor

• Vehicle speed signal

DTC Confirmation Procedure

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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 

TM-51, "Diagnosis Procedure"

.

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 

TM-51, "Diagnosis Procedure"

.

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 

TM-51, "Diagnosis Procedure"

.

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

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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 

TM-94, "Diagnosis Procedure"

.

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

Sensor 2 and Plug"

.

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 

TM-204, "Disassembly"

.

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

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On Board Diagnosis Logic

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• 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

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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 

TM-53, "Diagnosis Procedure"

.

Diagnosis Procedure

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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 

TM-40

.

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.