Transmission Control Systems

TROUBLE CODE 23 - ENGINE REVOLUTION SIGNAL

CONTENT OF DIAGNOSIS:
Engine revolution input signal circuit is open or shorted.

TROUBLE SYMPTOM:
No lockup occurs (after engine warm-up)
Power indicator remains on when vehicle speed is 0 mph.










1. MEASURE SIGNAL VOLTAGE INPUT OF TCU.
1) Turn ignition switch ON (with engine OFF).
2) Measure signal voltage input of TCU.

(Connector) terminal: Specified voltage
(B44) No.5 - Body: 10 V, min.


SELECT MONITOR FUNCTION MODE
Mode: 06
Condition: After warming up the engine
Specified data: EREV F06
(Engine speed is shown in rpm.)

2. CHECK HARNESS BETWEEN TCU AND ECU (MPFI).
1) Disconnect connector from TCU.
2) Disconnect connector from ECU.
3) Measure resistance between TCU connector and ECU connector.

(Connector) terminal: Specified resistance
(B44) No.5 - (B56) No.16: 0 Ohms
(B44) No.5-Body: 1 M Ohm min.