DME 7.8 DME 7.80 · Work instruction Display OK

DME 7.8 DME 7.80 Work instruction Display OK If not OK ♦Measure resistance between 0 - 5 Ω Check plug connec- special tool 9637 plug IV Pin 20 ⇒ Step 3 tion X 2/3, Pin 22, and relay slot of coolant fan 2 and check wiring plug Pin 2 harness for chafing and pinching dam- age 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 495 Fan output stage 2 - below limit Diagnosis conditions • Engine running • Battery voltage greater than 7 V • Medium pressure switch (air conditioning) active or engine tem- perature greater than 105 °C • Air conditioning switched on and off once Note! The triggering wire for relays stage 2, terminal 85, is monitored Possible fault cause ♦Short circuit to ground ♦Relay faulty ♦DME control module faulty Affected terminals Terminal IV/20 0-77 page 2 1908 P0481 p0481 Printed in Germany, 2000