46391/26391
Fault symptomPermanent: 46391
Intermittent: 26391*
* In order to eliminate the risk of an erroneous diagnostic trouble code being generated take action described in "Wiring Harness, Adapting".
Service and Repair
Conditions
No outside temperature pulses from EDU.
Outside Temperature Sensor - Testing
ISAT scan tool command: 251
Display shows outside temperature = -44 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 EDU. If there is a difference the fault may be open circuit or battery positive voltage on pin 17.
Action
NOTE: Before conducting this test, check that the outside temperature reading via the EDU is functioning normally. Also check (if DCC is fitted) for diagnostic trouble code F2.
1. Unplug connectors from the EDU and 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, refit 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, refit the old EDU control module and try with a new ACC control module.