80-12Fault code 26 · Temperature mixing valve motor - No reaction to acti-

911 Turbo (996) Air conditioning H01, H02 80 80-12Fault code 26 Temperature mixing valve motor - No reaction to acti- vation, signal unclear Diagnostic conditions • Ignition on Note! ♦No control module fault stored ♦No fault with supply voltage (5 V) Possible cause of fault ♦Short circuit to voltage/ground or open circuit in the wiring between the air-conditioning system regulator and the tempera- ture mixing valve ♦Servo motor for temperature mixing flap faulty or flap does not open/close smoothly. Affected terminals Plug B, terminals 9, 13 and 20 Plug D, terminals 2 and 10 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Visual inspection ♦Switch off ignition Check the connec- Clean connector or tor for corrosion plug in correctly ♦Remove connector for temper- and that it is cor- → End ature mixing valve rectly inserted ⇒ Step 2 2 Check 5 V - supply line to ♦Switch on ignition approx. 5 V ⇒ Step 6 temperature mixing valve ⇒ Step 3 ♦Measure voltage at plug of the motor temperature mixing valve between pin 3 and ground ♦Measure voltage at plug of the temperature mixing valve between pin 3 and pin 1 8001 Fault code 26 80-12 page 1 Printed in Germany – 15, 2001 26xxxh02