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 MANAGEMENTRELAYS AND MODULES - POWERTRAIN MANAGEMENTRELAYS AND MODULES - COMPUTERS AND CONTROL SYSTEMSENGINE CONTROL MODULEDIAGRAMSDIAGNOSTIC AIDSPART 3 OF 4
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)
Part 3 of 4
1993 BMW 740iL (E32/2) V8-3982cc 4.0L DOHC (M60)SECTION Part 3 of 4
System Troubleshooting Procedures:
Continuity Test
To perform a continuity test, first disconnect the car battery.
Then, while holding the leads together, adjust the ohmmeter to
read zero. Connect the ohmmeter leads to connector or terminals
at either end of the circuits suspected problem area. The ohmmeter
will show the resistance across that part of the circuit. This
test can also be performed with a self-powered test light.
Short Test Using Voltmeter
To locate a wiring short to ground, remove the blown fuse and
disconnect the load. Connect the voltmeter leads to the fuse terminals.
The positive lead should be connected to the terminal closest to the
power source.
Starting near the FRONT POWER DISTRIBUTION BOX, move the wire harness
back and forth and watch the voltmeter reading. If the voltmeter registers
a reading, there is a short to ground in the wiring. Somewhere in the
area of the harness being moved, the wire insulation is worn away and
the circuit is grounding.
RENDER: 1.0x
NO RELATED
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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.