Engine Speed

Description

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


CONSULT Reference Value in Data Monitor Mode

Remarks: Specification data are reference values.







On Board Diagnosis Logic

- This is an OBD-II self-diagnostic item.
- Diagnostic trouble code "P0725 ENGINE SPEED" with CONSULT or 9th judgement flicker without CONSULT is detected when TCM does not receive the proper voltage signal from ECM.


Possible Cause

Harness or connector (Circuit is open or shorted.)



DTC Confirmation Procedure

CAUTION:
- Always drive vehicle at a safe speed.
- If performing this "DTC Confirmation Procedure" again, always turn ignition switch OFF and wait at least 10 seconds before continuing.
After the repair, perform the following procedure to confirm the malfunction is eliminated.

WITH CONSULT

1.Turn ignition switch ON and select "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
2.Touch "START".
3.Start engine and maintain the following conditions for at least 10 consecutive seconds.

VEHICLE SPEED: 10 km/h (6 MPH) or more
THROTTLE POSI: More than 1.0/8
SLCT LVR POSI: "D" position

4.If the check result is NG, go to .

WITH GST

Follow the procedure "WITH CONSULT".

WITHOUT CONSULT

1.Start engine.
2.Drive vehicle under the following conditions for more than 10 seconds.

Selector lever position: "D" position
Vehicle speed: Higher than 10 km/h (6 MPH)
Throttle position: Greater than 1.0/8 of the full throttle position

3.Perform self-diagnosis. Automatic Transmission .
4.If the check result is NG, go to .


Wiring Diagram - AT - ENGSS







TCM TERMINALS AND REFERENCE VALUES

Automatic Transmission.


Diagnosis Procedure


1. CHECK DTC WITH ECM

Check DTC with CONSULT "ENGINE".
Turn ignition switch ON and select "SELF-DIAGNOSTIC RESULTS" mode for "ENGINE" with CONSULT.
CONSULT Function (Engine).
OK or NG
OK- GO TO 2.
NG- Check ignition signal circuit for engine control. Ignition Signal.

2. CHECK INPUT SIGNAL

With CONSULT
1.Start engine.
2.Select "TCM INPUT SIGNALS" in "DATA MONITOR" mode for "TRANSMISSION" with CONSULT.
3.Read out the value of "ENGINE SPEED". Check engine speed changes according to throttle position.





Without CONSULT
1.Start engine.





2.Check voltage between TCM harness connector terminal and ground.





OK or NG
OK- GO TO 4.
NG- GO TO 3.

3. CHECK HARNESS BETWEEN TCM AND ECM

1.Turn ignition switch OFF.
2.Disconnect ECM connector and TCM connector.





3.Check continuity between ECM connector and TCM connector.





4.If OK, check harness for short to ground and short to power.
5.If OK, check continuity between body ground and transaxle assembly.
6.Reinstall any part removed.
OK or NG
OK- GO TO 4.
NG- Repair open circuit or short to ground or short to power in harness or connectors.

4. CHECK DTC

Perform .
OK or NG
OK-INSPECTION END
NG- GO TO 5.

5. CHECK TCM

1.Check TCM input/output signal. Automatic Transmission.
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.