P0725

DTC P0725 ENGINE SPEED SIGNAL


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

TCM TERMINALS AND REFERENCE VALUE:

ON BOARD DIAGNOSIS LOGIC:

DIAGNOSTIC TROUBLE CODE (DTC) CONFIRMATION PROCEDURE

CAUTION: Always drive vehicle at a safe speed.

NOTE: If "DIAGNOSTIC TROUBLE CODE CONFIRMATION PROCEDURE" has been previously conducted, always turn ignition switch OFF and wait at least 5 seconds before conducting 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 "ENGINE" 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
THRTL POS SEN:...........More than 1.2V
Selector lever:.............D position (O/D ON)


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

AT - ENGSS:

Diagnostic Procedure
1. CHECK DTC WITH ECM
Perform diagnostic test mode 11 (self-diagnostic results) for engine control. Check ignition signal circuit condition.

OK or NG?

OK >> GO TO 2.

NG >> Check ignition signal circuit for engine control.

2. CHECK INPUT SIGNAL


With CONSULT-II.
1. Start engine.
2. Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "A/T" with CONSULT-II.










3. Read out the value of "ENGINE SPEED".
Check engine speed changes according to throttle position.

Without CONSULT-II
1. Start engine.
2. Check voltage between TCM harness connector M78 terminal 39 (P/L) and ground.
Does battery voltage (idle speed) 0.5 - 2.5V?

Yes >> GO TO 3.

No >> Check the following items:
- Harness for short or open between TCM and ECM
- Registor
- Ignition coil

3. CHECK DTC
Perform Diagnostic Trouble Code (DTC) confirmation procedure.

OK or NG?

OK >> INSPECTION END.

NG >>
1. Perform TCM input/output signal inspection.
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.