Time Relay

Remove coolant override switch connector. Check time relay to make sure it is cool. Turn ignition on. Vacuum advance solenoid should energize for 20 seconds and then de-energize. If solenoid does not de-energize, remove Blue lead from time relay. Solenoid will de-energize if relay is at fault.

Fig 1: TCS System (Not High Gear)

Courtesy of GENERAL MOTORS COMPANY

Fig 2: TCS System (High Gear)

Courtesy of GENERAL MOTORS COMPANY

Fig 3: TCS System (Cold Temp. Override)

Courtesy of GENERAL MOTORS COMPANY