Circuit Description
The PCM uses DTC P1579 to indicate that the vehicle transaxle was placed in gear under conditions that may cause damage to the vehicle powertrain, or create an unsafe condition. When such a condition occurs, the PCM reduces power to the engine by disabling fuel to individual cylinders.
Conditions for Running the DTC
DTCs P0122 and P0123 not set.
Conditions for Setting the DTC
| • | Gear selection from Park/Neutral to Drive/Reverse. |
| • | Vehicle speed less than 6 mph. |
| • | Engine speed greater than 2000 RPM. |
| • | Throttle angle of 20 degrees or greater. |
Action Taken When the DTC Sets
PCM will disable fuel to individual cylinders to reduce engine power.
| • | The malfunction indicator lamp (MIL) will not illuminate. |
| • | The PCM will command a message to be displayed. |
| • | The PCM may record operating conditions at the time the diagnostic fails. This information will be stored in the Failure Records. |
Conditions for Clearing the Message/DTC
| • | The PCM will turn the message OFF after one run and pass of the diagnostic test. |
| • | A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction. |
| • | The DTC can be cleared by using the scan tool Clear DTC Information function. |
Diagnostic Aids
If the drivers actions caused this DTC to set, clear the DTC and inform customer of proper shift procedure.
If the condition is intermittent, refer to Intermittent Conditions in Symptoms.
Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you perform the Powertrain On Board Diagnostic (OBD) System Check? | -- | ||
2 | Since this DTC will set when the vehicle is shifted into drive/reverse under possibly damaging conditions, verify with the customer the conditions under which the DTC set. Did the drivers actions cause this DTC to set? | -- | Go to Diagnostic Aids | |
3 |
Did you find and correct the condition? | -- | Go to Diagnostic Aids | |
4 |
Does the scan tool indicate that DTC P1579 passed? | -- | System OK |
