P0725

DTC P0725 ENGINE SPEED SIGNAL

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

On Board Diagnosis Logic
Diagnostic trouble code ENGINE SPEED SIG with CONSULT-II or P0725 without CONSULT-II is detected when TCM does not receive the proper voltage signal from ECM.

Possible Cause
Check harness or connectors. (The sensor circuit is open or shorted.)

Diagnostic Trouble Code (DTC) Confirmation Procedure

CAUTION: Always drive vehicle at a safe speed.

NOTE: If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at least 10 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.

Wiring Diagram-AT-ENGSS

AT-ENGSS-01:

AT-ENGSS-01





TCM TERMINALS AND REFERENCE VALUE MEASURED BETWEEN EACH TERMINAL AND 25 OR 48 (TCM GROUND)

Diagnostic Procedure
1. CHECK DTC WITH ECM
- Check P code with CONSULT-II ENGINE.
Turn ignition switch ON and select SELF-DIAGNOSTIC RESULTS mode for ENGINE with CONSULT-II.
Refer to Malfunction Indicator Lamp (MIL).
OK or NG
OK (with CONSULT-II) >> GO TO 2.
OK (without CONSULT-II) >> GO TO 4.
NG >> Check ignition signal circuit for engine control. Refer to IGNITION SIGNAL.

2. CHECK INPUT SIGNAL (WITH CONSULT-II)

With CONSULT-II
1. Start engine.





- 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.
OK or NG
OK >> GO TO 6.
NG >> GO TO 3.

3. DETECT MALFUNCTIONING ITEM
Check the following items:
- Harness for short or open between TCM and ECM
- Resistor and ignition coil
Refer to IGNITION SIGNAL.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

4. CHECK INPUT SIGNAL (WITHOUT CONSULT-II)

Without CONSULT-II





1. Start engine.
2. Check voltage between TCM connector F57 terminal 39 (L/OR) and ground.
Voltage: 0.6 (Idle speed) - 2.2V (3,000 rpm)
OK or NG
OK >> GO TO 6.
NG >> GO TO 5.

5. DETECT MALFUNCTIONING ITEM
Check the following items:
- Harness for short or open between TCM and ECM
- Resistor and ignition coil. Refer to IGNITION SIGNAL.
OK or NG
OK >> GO TO 6.
NG >> Repair or replace damaged parts.

6. CHECK DTC
Perform AT-504, Diagnostic Trouble Code (DTC) Confirmation Procedure.
OK or NG
OK >> INSPECTION END
NG >> GO TO 7.

7. CHECK TCM INSPECTION
1. Perform TCM input/output signal inspection. Pinout Values and Diagnostic Parameters
2. If NG, recheck TCM pin terminals for damage or loose connection with harness connector.
OK or NG
OK >> INSPECTION END
NG >> Repair or replace damaged parts.