DME 7.8 DME 7.8 0 · 0-197P1656

DME 7.8 DME 7.8 0 0-197P1656 575 Coolant shutoff valve - open circuit Diagnosis conditions • Engine running • Battery voltage greater than 7 V • Coolant temperature greater than 90 °C or ATF temperature > 85 °C Possible fault cause ♦Wiring harness ♦DME control module ♦Coolant shutoff valve Affected terminals Terminal IV/40 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check coolant shutoff ♦Remove connector of coolant Approx. 20 - 30 Ω Replace coolant valve for continuity shutoff valve ⇒ Step 2 shutoff valve → End ♦Measure resistance at coolant shutoff valve between Pin 1 and Pin 2 2 Check wiring from DME ♦Connect special tool 9637 to 0 - 5 Ω Repair wiring har- control module to cool- wiring harness (DME control ⇒ Step 3 ness ant shutoff valve for conti- module plug) → End nuity ♦Remove connector of coolant shutoff valve ♦Measure resistance between special tool 9637 plug IV Pin 40 and coolant shutoff valve plug Pin 2 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 P1656 0-197 page 1 Printed in Germany, 2000 p1656