P0725

DTC P0725 ENGINE SPEED SIGNAL





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




CONSULT-III Reference Value in Data Monitor Mode









On Board Diagnosis Logic
- This is not an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0725 ENGINE SPEED SIG" with CONSULT-III is detected when TCM does not receive the ignition signal from ECM during engine cranking or running.




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-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 P0725.




Diagnosis Procedure
1.CHECK CAN COMMUNICATION LINE
Perform the self-diagnosis. Refer to Diagnosis System (TCM).
Is a malfunction in the CAN communication indicated in the results?
YES - Check CAN communication line. Refer to A/T Control System A/T Control System A/T Control System A/T Control System A/T Control System.
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 position signal.





OK or NG
OK - GO TO 3.
NG - Check the ignition signal circuit.
- Refer to Diagnosis Procedure.
3.CHECK DTC
Perform "DTC Confirmation Procedure".
- Refer to P0725.
OK or NG
OK >> INSPECTION END
NG - GO TO 4.
4.CHECK TCM POWER SUPPLY AND GROUND CIRCUIT
Check TCM power supply and ground circuit. Refer to Main Power Supply and Ground Circuit.
OK or NG
OK - GO TO 5.
NG - Repair or replace damaged parts.
5.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 - Replace the control valve with TCM. Refer to Service and Repair.
NG - Repair or replace damaged parts.