Code

Outside temperature sensor - testing

Fault symptom

Permanent: 46391
Intermittent: 26391*

Conditions
No outside temperature pulses from Electronic Display Unit (EDU).

*In order to eliminate the risk of an erroneous diagnostic trouble code being generated, take action described in " Wiring Harness, Adapting". Service and Repair

Testing
ISAT scan tool command: 251

Display shows:
Outside temperature = -44° C to +50° C

If the display shows -44° C, the fault may be:
Open circuit or battery positive voltage on pin 17 when starting engine Ground on pin 17.
EDU or ACC faulty

Set the last reading received while driving. Compare with Electronic Display Unit (EDU). If there is a difference the fault may be:
Open circuit or battery positive voltage on pin 17.







Action

Important : Before conducting this test, check that the outside temperature reading via the EDU is functioning normally. Also check (if Driver Co-Driver Computer (DCC) is installed) for diagnostic trouble code F2.

1 Unplug connectors from the EDU and Automatic Climate Control (ACC) control module and check if there is an open circuit between pin 23 on the EDU connector and pin 17 on the ACC control module's 39 pin connector. If everything is normal, reinstall connectors, erase all diagnostic trouble codes and restart the system.
2 If the fault is still present, try with a new EDU.
3 If the fault still remains, reinstall the old EDU control module and try with a new ACC control module.