DME 7.8 DME 7.8 0 · 0-88.2P0638

DME 7.8 DME 7.8 0 0-88.2P0638 Throttle Jacking Unit, Position Error – Signal Implausi- ble Diagnosis conditions • Driving with changing pedal position Possible fault cause ♦Short circuit in wiring harness ♦Sluggish throttle Affected terminals Terminal I/9 and I/7 Note! The vehicle is in emergency function mode, i.e. the engine is turning at approx. 1200 rpm. Diagnosis/Troubleshooting Work instruction Display OK If not OK 1 Check wiring from DME ♦Connect special tool 9637. Low battery voltage Repair wiring har- control module pin I/7 to ♦Measure voltage between pin I/ Step 2. ness the throttle jacking unit → End. 7 and ground. for short circuit to B+. ♦Switch on the ignition. 2 Check wiring from DME ♦Connect special tool 9637. Low battery voltage Repair wiring har- control module pin I/9 to ♦Measure voltage between pin I/ Step 3. ness the throttle jacking unit → End. 9 and ground. for short circuit to B+. ♦Switch on the ignition. 3 Check wiring from DME ♦Connect special tool 9637. 0 V Repair wiring har- control module pin I/7 to ♦Measure voltage between pin I/ Step 4. ness the throttle part for short → End. 7 and pin I/2. circuit to ground. 2442 P0638 0-88.2 page 1 Printed in Germany – 6, 2002 p0638