Overdrive Relay: Testing and Inspection

CIRCUIT

INSPECTION OF ELECTRIC CONTROL COMPONENTS
1. INSPECT OVERDRIVE RELAY AND SOLENOID





a. Turn on the ignition switch and the main switch.
b. Disconnect the connector from the thermo switch.
c. Repeatedly ground the relay side of connector with a sub-wire.





d. At this time, confirm that an operation sound from the solenoid and overdrive relay can be heard.
If there is no sound from either the solenoid or relay, check them.

2. INSPECT OVERDRIVE RELAY





a. Remove the overdrive relay from the driver's side of the instrument panel reinforcement.





b. Using an ohmmeter, check that there is continuity between terminals 1 and 2.





c. Apply 12 V battery voltage across terminals 2 and 4. Using an ohmmeter, check that there is no continuity between terminals 1 and 2.

d. Install the overdrive relay.