80-7Fault code 21 · Outside temperature sensor - short to B+/ short to

911 Turbo (996) Air conditioning H01, H02 80 80-7Fault code 21 Outside temperature sensor - short to B+/ short to ground 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 outside temperature sensor ♦Temperature sensor faulty Affected terminals Plug B, terminals 5 and 9 Diagnosis/troubleshooting Work instruction Display OK If not OK 1 Check temperature sen- ♦Switch off ignition approx. 1.2 kΩ ⇒ Step 5 sor (at 23 °C) ♦Pull plug B off the air-condition- ⇒ Step 2 ing system regulator ♦Measure resistance on plug B between pin 5 and pin 9 2 Check wiring between air- ♦Remove connector of tempera- 0 V Repair wiring har- conditioning system regu- ture sensor ⇒ Step 3 ness lator and temperature → End ♦Switch on ignition sensor for short to B+ ♦Measure voltage at plug B of the air-conditioning system regula- tor between pin 5 and ground ♦Measure voltage at plug B of the air-conditioning system regula- tor between pin 9 and ground 3 Check wiring between air- ♦Measure resistance at plug B of ∞ Ω Repair wiring har- conditioning system regu- the air-conditioning system reg- ⇒ Step 4 ness lator and temperature ulator between pin 5 and ground → End sensor for short to ground 8001 Fault code 21 80-7 page 1 Printed in Germany – 15, 2001 21xxxh02