P1579
DTC P1579 Pin to D/R At Hi Throttle Angle - Power Reduction Mode ActiveCIRCUIT DESCRIPTION
This diagnostic test is used to detect the vehicle transaxle being placed in gear under conditions that may cause damage to the vehicle powertrain or create an unsafe condition. When such a condition exists, DTC P1579 is set and engine power will be reduced 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 or Neutral to Drive or Reverse
^ Vehicle speed less than 6 MPH
^ Engine speed more than 2000 RPM
^ Throttle angle of 20 degrees or more
ACTION TAKEN WHEN THE DTC SETS
PCM will retard spark and 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 forty consecutive warm-up cycles with no failures of any non-emission related diagnostic test.
^ A Last Test Failed (current) DTC will clear when the diagnostic runs and does not fail.
^ Use a scan tool to clear DTCs.
^ Interrupting PCM battery voltage may or may not clear DTCs. This practice is not recommended.
DIAGNOSTIC AIDS
If the condition is intermittent, refer to Intermittent Conditions in Symptoms. Intermittent Conditions
TEST DESCRIPTION
