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 MANUALSBMW1994318IS (E36) L4-1796CC 1.8L DOHC (M42)REPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTTRANSMISSION CONTROL SYSTEMSDESCRIPTION AND OPERATIONFUNCTIONAL DESCRIPTIONFAULT DISPLAY
1994 BMW 318is (E36) L4-1796cc 1.8L DOHC (M42)
Fault Display
1994 BMW 318is (E36) L4-1796cc 1.8L DOHC (M42)SECTION Fault Display
Fault Indication with Serial Data Transfer
The transmission control unit transfers data on the fault indicator line (Pin 29) relating to the transmission oil temperature and the selector lever coding (4th or 5th gear) to the instrument cluster.
The fault lamp is activated by the instrument cluster when a voltage of 12 V is applied on this line for longer than 1 sec. This is the case when the Electronic Transmission Control (EGS) control unit is still in its initialization phase (ignition "ON", engine still not started), or in the emergency program or when the wire has a break (pull-up resistor in the instrument cluster).
The transmission control unit transfers data on the fault indicator line (Pin 29) relating to the transmission oil temperature and the selector lever coding (4th or 5th gear) to the instrument cluster.
The fault lamp is activated by the instrument cluster when a voltage of 12 V is applied on this line for longer than 1 sec. This is the case when the Electronic Transmission Control (EGS) control unit is still in its initialization phase (ignition "ON", engine still not started), or in the emergency program or when the wire has a break (pull-up resistor in the instrument cluster).
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.