Computers and Control Systems

Diagnostic Trouble Code (DTC) Texts.

DTC Versions
Version 1 - Signal implausible / Implausible Component Section / Malfunction
Version 2 - Interruption / No Signal
Version 3 - Short to Ground / Below Lower Limit / Lean Mixture Limit
Version 4 - Short to B+ / Above Upper Limit Rich Mixture Limit

Malfunction Indicator Light MIL (Check engine)
0 - MIL is not triggered with this fault
1 - MIL is on and Freeze Frame is stored in memory
2 - MIL is on and a previous Freeze Frame is overridden
3 - MIL is blinking and a previous Freeze Frame is overridden

NOTE: In order to ensure that a fault is no longer present after a repair or after the fault memory has been erased, the vehicle road test should be ended only when a trip has been reached. This is the only way of ensuring that all diagnosis routines are carried out by the ECM.

In the case of Tiptronic vehicles, the Tiptronic fault memory must also be read, because activation of the MIL Check Engine can also be initiated by the Tiptronic.