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Transmission Control Systems

TROUBLE CODE 23
ENGINE SPEED SIGNAL

Diagnosis
Engine speed input signal circuit is open or shorted.

Trouble Symptom
- No lock-up occurs (after Engine warm-up).
- Power indicator remains on when vehicle speed is "0".





1. Measure signal voltage input of Transmission Control Module (TCM).
a. Turn Ignition Switch "ON" (with Engine "OFF").





b. Measure signal voltage input to TCM.

Connector & Terminal / Specified Voltage:
(B52) No. 4 - Body / 10.5 Volts, minimum


Select Monitor Function Mode
- Mode: F06
- Condition:
After warming-up the Engine.
- Specified Data:
EREV F06
(Engine speed is shown in rpm.)

2. Check harness and connector between TCM and Engine Control Module (ECM) (MFI).
a. Disconnect connector from TCM.
b. Disconnect connector from ECM (MFI).





c. Measure resistance between TCM connector and ECM (MFI) connector.

Connector & Terminal / Specified Resistance:
(B52) No. 4 - (B29) No. 3 / 0 Ohms.
(B52) No. 4 - Body / 1 M Ohm, minimum