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.
1990 Volvo 760 GLE, AW71FACTORY OEM SERVICE PROCEDURE
Ground Circuit Checks
- Turn ignition switch to OFF position. On all models except 740 GL with Bendix Rex 1 ignition and 740 GLE, connect an ohmmeter between ground and ECU connector pins No. 20 and No. 14.
- On 740 GL with Bendix RX7 1 ignition and 740 GLE models, connect ohmmeter between ground and ECU connector pin No. 20. On all models, ohmmeter should read continuity.
- Turn ignition switch to OFF position. Connect voltmeter leads between ECU connector pins No. 6 (Blue wire) and No. 20 (Brown wire). See Figure .
- Turn ignition switch to ON. Voltmeter should read 12 volts (battery voltage. If no voltage exists, check pin No. 20 wire for bad ground.
Factory Service Tools
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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.
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