For 1990-2009 cars only
Circuit Description
This diagnostic test checks for the loss of or invalid Theft Deterrent System serial data to the PCM. When such a condition exists for 11 seconds DTC P1626 is set.
If this DTC sets after the engine is already running, the engine will continue to run and will continue to start on subsequent drive trips as long as the battery is not disconnected. If this DTC sets at PCM power-up, the starter and engine fueling will be disabled.
Conditions for Setting the DTC
| • | Ignition switch ON for 5 seconds and PCM not receiving Theft Deterrent System serial data. |
| OR |
| • | PCM unable to communicate with the Theft Deterrent System for at least 11 seconds. |
Action Taken When the DTC Sets
| • | The powertrain control module (PCM) stores the DTC information into memory when the diagnostic runs and fails. |
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The PCM records the operating conditions at the time the diagnostic fails. The PCM stores this information in the Failure Records. |
Conditions for Clearing the MIL/DTC
| • | A History DTC will clear after forty consecutive warm-up cycles, if no failures are reported by this or any other non-emission related diagnostic. |
| • | A last test failed (Current DTC) will clear when the diagnostic runs and does not fail. |
| • | Use a scan tool in order to clear the MIL/DTC. |
| • | Interrupting the PCM battery voltage may or may not clear DTCs. This practice is not recommended. Refer to Powertrain Control Module Description , Clearing Diagnostic Trouble Codes. |
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On-Board Diagnostic (OBD) System Check? | -- |
