P0507

CIRCUIT DESCRIPTION

The Throttle Actuator Motor is a TAC controlled DC motor located on the throttle body. The motor drives the throttle plates. In order to decrease idle speed, the TAC commands the throttle closed reducing air flow into the engine and the idle speed decreases. In order to increase idle speed, the TAC commands the throttle plates open allowing more air to bypass the throttle plates. If the Actual idle RPM does not match the Desired idle RPM within a calibrated time, this DTC sets

CONDITIONS FOR SETTING THE DTC

^ DTCs P0101, P0102, P0108, P0107, P0108, P0112, P0113, P0171, P0172, P0174, P0175, P0300, P0441, P0443, P0500, P0502, P0503, P1120, P1220, P1221, P1441 not set.

^ Engine is operating for at least 60 seconds

^ ECT is greater than 60°C (140°F)

^ IAT is greater than -10°C (14°F)

^ Baro is greater than 65 kPa

^ System voltage is between 9.0 and 17.0 volts

^ Vehicle speed is less than 1 mph

^ APP Indicated Angle is 0%

^ Idle speed is above the desired RPM

^ Conditions exist for 5 seconds

^ The actual idle speed is 200 RPM greater than the desired idle speed

ACTION TAKEN WHEN THE DTC SETS

^ The PCM illuminates the Malfunction Indicator Lamp on the second consecutive drive trip that the diagnostic runs and fails.

^ The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive drive trip, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure records.

CONDITIONS FOR CLEARING THE MIL/DTC

^ The PCM turns the MIL OFF after three consecutive drive trips that the diagnostic runs and does not fail.

^ A last test failed (current DTC) clears when the diagnostic runs and does not fail.

^ A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.

^ The PCM battery voltage is interrupted.

^ Use a scan tool in order to clear the MIL/DTC.


DIAGNOSTIC AIDS

A build up of foreign material (ice) in the throttle bore may cause a high idle speed.

Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can aid in determining how many miles since the DTC set. The Fail Counter and Pass Counter can also aid determining how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This will isolate when the DTC failed. For an intermittent, refer to Symptoms. Testing and Inspection


TEST DESCRIPTION

The numbers below refer to the step numbers on the diagnostic table.

2. This step determines whether or not the engine can achieve the commanded RPM, and if not, whether the RPM is too high or too low.