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 MANUALSVOLVO1993940 TURBO, 4D SEDAN, AW71REPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - TESTS W/CODES - LH 2.4/EZK 116 IGNITIONIGNITION SYSTEM - DIAGNOSTIC TROUBLE CODE TESTINGDTC 1-4-2: CONTROL MODULE FAULTTESTING
1993 Volvo 940 Turbo, 4D Sedan, AW71
DTC 1-4-2: Control Module Fault: Testing
1993 Volvo 940 Turbo, 4D Sedan, AW71SECTION Testing
Use illustration(s) for diagnosis of DTC 1-4-2, see Fig 1 . If fault tracing cannot be completed through DLC, check DLC. See CHECKING DATA LINK CONNECTOR under SELF-DIAGNOSTIC SYSTEMS.
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.