DME 7.8 DME 7.80 · Fuel Pump Relay Output Stage – Below Limit

DME 7.8 DME 7.80 Fuel Pump Relay Output Stage – Below Limit Diagnosis conditions • Engine started Note! The triggering wire for the fuel pump relay, terminal 85, is moni- tored. Possible fault cause ♦Fuel pump relay ♦Short circuit to ground ♦DME control module Affected terminals Terminal IV/10 Diagnosis/Troubleshooting Work instruction Display OK If not OK 1 Check fuel pump relay ♦Remove fuel pump relay Approx. 75 Ω Replace fuel pump ♦Measure resistance between Pin Step 2 relay → End 85 and Pin 86 2 Check wiring from DME ♦Connect special tool 9637 to ∞ Ω Repair wiring har- control module, Pin IV/10, wiring harness (DME control Step 3. ness to fuel pump relay for module plug). → End. short circuit to ground ♦Remove fuel pump relay ♦Measure resistance between special tool 9637 Pin IV/10 and ground 3 Replace DME control module. Step 4. 4 Perform adaptation. ♦Switch on the ignition. → End. ♦Wait one minute. ♦Do not press the accelerator. ♦Switch off the ignition for at least 10 seconds. ♦Read out the fault memory. 0-38.10 page 2 2472 P0230 p0230 Printed in Germany – 6, 2002