O/D Cancel Signal Circuit

CIRCUIT DESCRIPTION
While driving with cruise control activated, in order to minimize gear shifting and provide smooth cruising up-hill, Overdrive may be prohibited temporarily in some conditions.
The Cruise Control Electronic Control Unit (ECU) sends O/D Cut signals to the engine control module (ECM) as necessary and the ECM cancels Overdrive shifting until these signals are disconnected.

WIRING DIAGRAM

O/D Cancel Signal Circuit:

INSPECTION PROCEDURE
1. Check voltage between terminal OD1 of engine control module (ECM) connector and body ground.




- Turn ignition switch ON.
- Measure voltage between terminal "OD1" of ECM connector and body ground.
Voltage: 10 - 14 volts
OK - Proceed to next circuit inspection shown on matrix chart in Diagnosis By Symptom.
NG - Go to Step 2
2. Check voltage between terminal "OD" of cruise control ECU harness side connector and body ground.




- Disconnect Cruise Control ECU connector.
- Turn ignition switch ON.
- Measure voltage between terminal "OD" of cruise control ECU harness side connector and body ground.
Voltage: 10-14 volts
OK - Check and replace Cruise Control ECU.
NG - Go to Step 3.
3. Check harness or connector between cruise control ECU and ECM.
OK - Check and replace ECM.
NG - Repair or replace harness or connector as indicated.