Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGEO1995TRACKER BASE, 1.6 6, 4WD, STANDARDREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMENGINE CONTROLS - SYSTEM/COMPONENT TESTS - TBIMISCELLANEOUS CONTROLSTRANSMISSIONLOCK-UP RELAY SYSTEM
1995 Geo Tracker Base, 1.6 6, 4WD, Standard
Lock-Up Relay System
1995 Geo Tracker Base, 1.6 6, 4WD, StandardSECTION Lock-Up Relay System
- Lock-up relay system is used on A/T models only. Disconnect negative battery terminal. Remove ECM from holder. Disconnect ECM harness connector. Install harness connector between ECM and ECM harness connector. Connect negative battery terminal.
- Start and warm engine to normal operating temperature. Connect DVOM between ECM connector terminal A6 and ground. With engine running, shift transaxle to Drive and release brake pedal. DVOM should read zero volts.
- On a flat road, drive vehicle with transaxle in Drive at speed greater than 42 MPH. Maintain speed for at least 4 seconds, with throttle valve open less than 70 percent. Voltage at ECM terminal A6 should indicate battery voltage when lock-up relay transmits an engine signal to solenoid.
- If battery voltage is not indicated, check wiring harness, lock-up relay, solenoid, brake pedal switch or oil pressure switch. To check lock-up relay, see TORQUE CONVERTER CLUTCH (TCC) RELAY (A/T) under RELAYS under RELAYS & SOLENOIDS. If system components and circuits test okay, replace faulty ECM.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.