P0725

DTC P0725 ENGINE SPEED SIGNAL

Description
The engine speed signal is sent from the ECM to the TCM.





CONSULT-II Reference Value

On Board Diagnosis Logic
^ This is an OBD-II self-diagnostic item.
^ Diagnostic trouble code "ENGINE SPEED SIG" with CONSULT-II or P0725 * without CONSULT-II is detected when TCM does not receive the ignition signal from ECM during engine cranking or running.
*: For VQ35DE engine.

Possible Cause
Harness or connectors
(The ECM to the TCM circuit is open or shorted.)

DTC Confirmation Procedure

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-II





1. Turn ignition switch "ON" and select "DATA MONITOR" mode for "A/T" with CONSULT-II.
2. Start engine and maintain the following conditions for at least 10 consecutive seconds.
VHCL SPEED SE: 10 km/h (6 MPH) or more
ACCELE POSI: More than 1/8 Selector lever: "D" position
3. If DTC is detected, go to "Diagnostic Procedure".

WITH GST
Follow the procedure "With CONSULT-II".

Diagnostic Procedure
1. CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Is a malfunction in the CAN communication indicated in the results?

Yes or No
Yes >> Check CAN communication line. Refer to "DTC U1000 CAN COMMUNICATION LINE". Transmission Control Systems
No >> GO TO 2.

2. CHECK DTC WITH TCM
With CONSULT-II
1. Start engine.





2. Select "ECU INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.
3. While monitoring engine speed, check for engine speed change corresponding to wide-open throttle position signal.

With GST
Follow the procedure "With CONSULT-II".

OK or NG
OK >> GO TO 3.
NG >> Check the ignition signal circuit. Description and Operation

3. CHECK TCM
Perform TCM input/output signal inspection.

OK or NG
OK >> GO TO 5.
NG >> GO TO 4.

4. DETECT MALFUNCTIONING ITEM
Check the following items:
^ Power supply and ground circuit for TCM.
^ The A/T assembly harness connector pin terminals for damage or loose connection with harness connector.

OK or NG
OK >> Replace the transmission assembly.
NG >> Repair or replace damaged parts.

5. CHECK DTC
Perform DTC Confirmation Procedure.

OK or NG
OK >> INSPECTION END
NG >> GO TO 3.