Engine Off Timer Monitoring

Engine Off Timer Monitoring

General description
The ECU receives the engine off duration from the instrument cluster.

The diagnosis runs during ignition on.

The ECU observes if after a specified time, the engine off duration has changed. A signal error will be set if no change in engine off duration is observed. Minimum error will be set if the range of time changing is too small. Maximum error will be set if the range of time changing is too large. If the range of time changing jitters between too wide and too short a plausibility error will be set.

In power latch phase it is checked if the received engine off time fits to the engine off time calculated by ECU. If the received time is too large or too small a minimum or maximum error is set.

Montitoring Conditions

See Summary Table Diagnostic Trouble Code Descriptions

Error Symptom
Signal error
Minimum Error
Maximum Error
Plausibility Error

Input parameters for monitoring
time counter via CAN