This Service Information bulletin supersedes S.I. 12 07 99 dated February 1999.
designates changes to this revision
SUBJECT
Motor Driven Throttle Valve (MDK)
MODEL
E39 – 528i/iA with M52TU engine produced 9/98-
E46 – 323i/iA & 328i/iA with M52TU engine produced 6/98-
Z3 roadster with 2.5L/2.8L engine and M coupe with 2.8L engine produced 9/98-
SITUATION
Customer complains that the "Check Engine" lamp is illuminated and one or
more of the following faults are set in the Engine Control Module (ECM/DME):
Fault Code 109 (6D) - Plausibility of motor driven throttle valve
Fault Code 110 (6E) - Signal, drivers wish sensor potentiometer 1
Fault Code 111 (6F) - Signal, drivers wish sensor potentiometer 2
Fault Code 112 (70) - Signal, throttle position sensor, potentiometer 1
Fault Code 113 (71) - Signal, throttle position sensor potentiometer 2
Fault Code 114 (72) - Motor throttle valve final stage
Fault Code 115 (73) - Reference voltage, voltage regulator 1
Fault Code 116 (74) - Reference voltage, voltage regulator 2
Fault Code 117 (75) - Plausibility signal, drivers wish sensor potentiometer 1 and 2
Fault Code 118 (76) - Plausibility signal, motor driven throttle valve sensor, potentiometers 1 and 2
Fault Code 119 (77) - MDK throttle mechanical sticking
Fault Code 120 (78) - Pedal Sensor, throttle valve potentiometer
Fault Code 172 (AC) - Signal, drivers wish sensor, potentiometers 1 and 2, short circuit
Fault Code 173 (AD) - Signal, throttle position sensor, potentiometers 1 and 2 short circuit
Fault Code 175 (AF) - Driver"s wish sensor 1, adaptation
Fault Code 176 (B0) - Driver"s wish sensor 2, adaptation along with either:
Fault Code 169 (A9) - Motor-drive throttle valve output stage cutoff after diagnosis fault
Fault Code 170 (AA) - Control unit self test, internal fault
Fault Code 171 (AB) - Plausibility motor driven throttle valve
CAUSE
The above listed faults may set as a result of the following:
1. Break/open in the wiring from the DME to the throttle motor (MDK).
2. Contamination of the actuator or potentiometers within the MDK.
PROCEDURE
If any of the above listed faults are set perform the following:
1. Using a breakout box check the wiring from the DME to the MDK for open or short to ground.
2. If the wiring is correct then the MDK should be replaced. Important: After MDK motor replacement, the DME adaptation values must be cleared. Failure to clear the adaptation values will result in reoccurring faults.
3. Switch off the ignition off for 30 seconds.
4. Turn on the ignition and delete DME adaptations and fault code memory.
5. Press the accelerator pedal to wide open throttle (WOT) four times.
designates changes to this revision
SUBJECT
Motor Driven Throttle Valve (MDK)
MODEL
E39 – 528i/iA with M52TU engine produced 9/98-
E46 – 323i/iA & 328i/iA with M52TU engine produced 6/98-
Z3 roadster with 2.5L/2.8L engine and M coupe with 2.8L engine produced 9/98-
SITUATION
Customer complains that the "Check Engine" lamp is illuminated and one or
more of the following faults are set in the Engine Control Module (ECM/DME):
Fault Code 109 (6D) - Plausibility of motor driven throttle valve
Fault Code 110 (6E) - Signal, drivers wish sensor potentiometer 1
Fault Code 111 (6F) - Signal, drivers wish sensor potentiometer 2
Fault Code 112 (70) - Signal, throttle position sensor, potentiometer 1
Fault Code 113 (71) - Signal, throttle position sensor potentiometer 2
Fault Code 114 (72) - Motor throttle valve final stage
Fault Code 115 (73) - Reference voltage, voltage regulator 1
Fault Code 116 (74) - Reference voltage, voltage regulator 2
Fault Code 117 (75) - Plausibility signal, drivers wish sensor potentiometer 1 and 2
Fault Code 118 (76) - Plausibility signal, motor driven throttle valve sensor, potentiometers 1 and 2
Fault Code 119 (77) - MDK throttle mechanical sticking
Fault Code 120 (78) - Pedal Sensor, throttle valve potentiometer
Fault Code 172 (AC) - Signal, drivers wish sensor, potentiometers 1 and 2, short circuit
Fault Code 173 (AD) - Signal, throttle position sensor, potentiometers 1 and 2 short circuit
Fault Code 175 (AF) - Driver"s wish sensor 1, adaptation
Fault Code 176 (B0) - Driver"s wish sensor 2, adaptation along with either:
Fault Code 169 (A9) - Motor-drive throttle valve output stage cutoff after diagnosis fault
Fault Code 170 (AA) - Control unit self test, internal fault
Fault Code 171 (AB) - Plausibility motor driven throttle valve
CAUSE
The above listed faults may set as a result of the following:
1. Break/open in the wiring from the DME to the throttle motor (MDK).
2. Contamination of the actuator or potentiometers within the MDK.
PROCEDURE
If any of the above listed faults are set perform the following:
1. Using a breakout box check the wiring from the DME to the MDK for open or short to ground.
2. If the wiring is correct then the MDK should be replaced. Important: After MDK motor replacement, the DME adaptation values must be cleared. Failure to clear the adaptation values will result in reoccurring faults.
3. Switch off the ignition off for 30 seconds.
4. Turn on the ignition and delete DME adaptations and fault code memory.
5. Press the accelerator pedal to wide open throttle (WOT) four times.
Comment