Upstream NOx sensor supply, short circuit to battery
Check for short circuit to battery faults on the pins on the EEC control unit (E67) that are connected to the upstream NOx sensor (T131) supply. For a detailed harness and pin description see the electrical component, under the check tab, in the diagnostic tool. For a general description about different methods for electrical failure checks see the work shop manual subgroup 16-70. In order to inactivate the electrical fault code it is necessary to restart the EEC control unit.
What you'll see
No driver-visible symptom recorded.
System reaction
No system-reaction text recorded.
Diagnostic depth
The EEC control unit (E67) is indicating a short circuit to battery fault on the pins connected to the upstream NOx sensor (T131) supply.
A short circuit to battery fault on the pins connected to the downstream NOx sensor (T131) supply.