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 MANUALSVOLVO1991940 TURBO, 4D SEDAN, AW71REPAIR AND DIAGNOSIS (SINGLE PAGE)BRAKESANTI-LOCK BRAKESANTI-LOCK BRAKE SYSTEMDIAGNOSIS & TESTINGABS CIRCUIT TESTSTRANSIENT SURGE PROTECTOR
1991 Volvo 940 Turbo, 4D Sedan, AW71
Transient Surge Protector
1991 Volvo 940 Turbo, 4D Sedan, AW71SECTION Transient Surge Protector
- Disconnect ECU connector. See Figure and Figure . Turn ignition on. Connect DVOM between terminal No. 1 on ECU connector and ground. DVOM should read battery voltage. If battery voltage is not present, measure voltage on transient surge protector connector. Transient surge protector is clipped to ECU.
- Terminals No. 1, 2 and 4 should have battery voltage. Check for continuity between terminal No. 3 and ground. If only terminals No. 1 and 4 have voltage when terminal No. 3 is grounded, replace transient surge protector.
RENDER: 1.0x
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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.