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 MANUALSBMW1993740IL (E32/2) V8-3982CC 4.0L DOHC (M60)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSDESCRIPTION AND OPERATIONENGINE CONTROL SYSTEM OUTPUTSA/C COMPRESSOR CONTROL
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
A/C Compressor Control
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION A/C Compressor Control
Regulation of the A/C Compressor relay is an output of the ECM. As with Bosch and Siemens systems, the EGM controls the A/C compressor relay based on signals from the IHKA/IHKR control modules.
When the IHKA/IHKR control module requests compressor activation, the ECM prepares for the additional load of the compressor by modifying the ignition timing and stabilizing idle speed.
The A/C compressor is cut off during WOT acceleration at low speeds to allow the engine to achieve maximum power.
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.