P1514

CIRCUIT DESCRIPTION
The Powertrain Control Module (PCM) uses the following information in order to calculate an expected Mass Air Flow (MAF) rate:
^ The Throttle Position (TP)
^ The Barometric Pressure (BARO)
^ The Intake Air Temperature (IAT) The engine RPM

The PCM compares this value to the MAF value, and the speed density calculation in order to verify the proper throttle operation.

CONDITIONS FOR RUNNING THE DTC
^ Other Electronic Throttle Control (ETC) DTCs are not present.
^ PCM processor DTCs are not present.
^ The engine is running and engine speed is more than 600 RPM.

CONDITIONS FOR SETTING THE DTC
The PCM detects that the actual MAF and speed density is much more than the expected, or the calculated airflow rate.

ACTION TAKEN WHEN THE DTC SETS
^ The control module illuminates the Malfunction Indicator Lamp (MIL) when the diagnostic runs and fails.
^ The control module records the operating conditions at the time the diagnostic fails. The control module stores this information in the Freeze Frame/Failure Records.

CONDITIONS FOR CLEARING THE MIL/DTC
^ The control module turns OFF the Malfunction Indicator Lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
^ A current DTC "Last Test Failed" clears when the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
^ Use a scan tool in order to clear the MIL and the DTC.

DIAGNOSTIC AIDS
Inspect for the following:
^ The throttle blade for damage
^ A skewed cam sensor signal-Inspect for signals that are intermittently shorted to ground, causing a fluctuating RPM on the scan tool.

If the condition is intermittent, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-5:

The numbers below refer to the step numbers on the diagnostic table.
3. Inspect the throttle body assembly. Manually move the throttle blade from closed to Wide Open Throttle (WOT). You should not need to use excess force. The throttle blade should move smoothly through the full range and should return to a slightly open position.
5. When the PCM detects a condition within the ETC system other DTCs may set due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Keep this in mind when reviewing captured DTC info.