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Home >> Geo >> 1990 >> Tracker LSi, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - System/Component Tests >> Miscellaneous Controls >> Transmission Controls >> Lock-Up Solenoid Relay (A/T)
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Lock-Up Solenoid Relay (A/T)

  1. Relay is located at right rear corner of engine compartment, in front of battery. With ignition off, disconnect lock-up relay connector.
  2. Using test light connected to ground, check for voltage at White/Red and Light Green/Red wires of connector. If voltage is present at both wires, proceed to step 3). If voltage was not present, check for open or short to ground on defective circuit. The White/Red wire runs from relay to stoplight switch. The Light Green/Red wire runs from relay to control relay, located under left side of instrument panel, near kick panel and fuse block.
  3. Connect test light to battery supply. Using test light, check for voltage at White/Yellow and White wires. If no voltage is present, proceed to step 6).
  4. If voltage is present on White wire, check for short to ground in wire from relay to oil pressure switch at transmission. If no short exists, replace oil pressure switch located inside transmission.
  5. If voltage is present on White/Yellow wire, check for short to ground in wire from relay to Yellow connector terminal No. 11 of ECM. The ECM is located under left side of instrument panel near kick panel. If no short or ground is present, replace ECM.
  6. If no voltage is present on White and White/Yellow wires, install electrical connector on 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 is present, go to step 7). If no voltage is present, replace relay.
  7. Disconnect jumper wire installed in step 6). Using test light, check for voltage at White wire of relay. If voltage is present, replace relay. If no voltage is present, proceed to step 8).
  8. Turn ignition off. Disconnect Yellow connector from ECM. Turn ignition on. Connect test light to battery voltage and probe Light Blue wire terminal at ECM. If voltage is present, proceed to step 9). If no voltage is present, replace lock-up solenoid located in transmission.
  9. Turn ignition off. Install connector on ECM. Disconnect electrical connector from lock-up solenoid relay. Install test light between White/Yellow wire and battery voltage. Operate vehicle at normal operating temperature on flat lever surface over 42 MPH and note if voltage is present on test light.
  10. If voltage was not present, check for open in White/Yellow wire between relay and ECM. If circuit is okay, check or replace ECM. If voltage was present, proceed to step 11).
  11. Stop vehicle and connect test light between White wire of relay connector and battery voltage. Operate vehicle at normal operating temperature on flat lever surface over 42 MPH and note if voltage is present on test light.
  12. If voltage was not present, replace transmission oil pressure switch. If voltage was present, no problem exists in relay operation.
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