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Home >> Geo >> 1991 >> Tracker Base, RWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Miscellaneous Controls >> Transmission Controls >> Torque Converter Clutch (TCC) Relay (A/T)

Torque Converter Clutch (TCC) Relay (A/T)

  1. The TCC relay is located at right corner of engine compartment, on fusible link box and contains a Green connector. With ignition on, disconnect TCC relay electrical connector.
  2. Using test light connected to ground, check for voltage at White/Red and Blue/Black wires of electrical connector. If voltage exists at both wires, proceed to step 3). If voltage does not exist, check for open or short to ground on defective circuit. The White/Red wire goes from TCC relay to stoplight switch. The Blue/Black wire goes from TCC relay to EFI main relay, located near ECM. See Figure .
  3. Connect test light to battery supply. Using test light, touch White/Yellow and White wires of TCC relay electrical connector. If light does not light, proceed to step 6).
  4. If light lights on White wire, check for short to ground in White wire from TCC relay to oil pressure switch at transmission. If no short to ground exists, replace oil pressure switch located inside transmission.
  5. If light lights on White/Yellow wire, check for short to ground in White/Yellow wire from TCC relay to ECM. The ECM is located under left side of instrument panel near kick panel. See Figure If no short to ground exists, replace ECM.
  6. If light does not light on White and White/Yellow wires, install electrical connector on TCC relay. Install jumper wire from ground to White/Yellow wire through back of connector. Using test light, check for voltage at White wire of connector. If voltage exists, proceed to step 7). If no voltage exists, replace TCC relay.
  7. Disconnect jumper wire installed in step 6). Using test light, check for voltage at White wire of TCC relay. If voltage exists, replace TCC relay. If no voltage exists, proceed to step 8).
  8. Turn ignition off. Disconnect electrical connector from TCC relay. Connect test light to battery supply. Probe White/Yellow wire of electrical connector with test light.
  9. Operate vehicle to normal operating temperature on a flat surface at a speed exceeding 42 mph. Note if test light comes on. If test light comes on, system is operating correctly. If test light does not come on, check for open circuit in White/Yellow wire between TCC relay and ECM. If wiring is okay, replace ECM.
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