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 MANUALSBMW1987L7 (E23) L6-3430CC 3.4L SOHC (M30)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSTESTING AND INSPECTIONSYMPTOM RELATED DIAGNOSTIC PROCEDURESTEST POSITIONS FOR DIGITAL MOTOR ELECTRONICSTEST 1 SPEED AND REFERENCE MARK SENSORS
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)
Test 1 Speed and Reference Mark Sensors
1987 BMW L7 (E23) L6-3430cc 3.4L SOHC (M30)SECTION Test 1 Speed and Reference Mark Sensors
Test 1 SPEED AND REFERENCE MARK SENSORS
- Check wires for tight fit and damage
- Check conditions and arrangement of plug connections.
- Reference mark sensor (B) is marked with a ring.
- Turn engine with the starter.
- Check resistance (M 06) and oscillograph (M 22/23) on disconnected pulse sensor plug with BMW service test unit.
- Check wire leading to DME control unit:
- Take off trim panel
- Pull off ping on control unit and connect on universal adapter with (35-pin) test lead. Check power flow (M 06) in wires, on specified pins.
- Check wires for tight fit and damage
- Check conditions and arrangement of plug connections.
- Reference mark sensor (B) is marked with a ring.
- Turn engine with the starter.
- Check resistance (M 06) and oscillograph (M 22/23) on disconnected pulse sensor plug with BMW service test unit.
- Check wire leading to DME control unit:
- Take off trim panel
- Pull off ping on control unit and connect on universal adapter with (35-pin) test lead. Check power flow (M 06) in wires, on specified pins.
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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.