P1515

CIRCUIT DESCRIPTION
The commanded Throttle Position (TP), based on the Accelerator Pedal Position (APP) and other possibly limiting factors, is compared to the actual throttle position. The 2 values should be within a calibrated range of each other. Both the Powertrain Control Module (PCM) and the Throttle Actuator Control (TAC) module redundantly monitor the commanded and actual TP. This Diagnostic Trouble Code (DTC) sets if the PCM detects an out-of-range condition between commanded and actual pedal position.

CONDITIONS FOR RUNNING THE DTC
^ DTCs P0601, P0602, P0604, P0606, P1516, P1517, or P1518 are not set.
^ DTCs P1120, P1220, and P1221 are not set at the same time, or DTCs P1120 and P1220 are not set at the same time.
^ The ignition switch is in the crank or run position.
^ The ignition voltage is greater than 8.5 volts.
^ The TAC system is not in the battery saver mode.

CONDITIONS FOR SETTING THE DTC
^ The PCM detects that the commanded and the actual throttle positions are not within a calibrated range of each other.
^ All of the above conditions exist for less than 1 second.

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 and/or the Failure Records.
^ The control module commands the TAC system to operate in the Reduced Engine Power mode.

OR

^ Under certain conditions the control module commands the engine OFF.
^ The message center displays Reduced Engine Power.

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
^ If you DO NOT find any trouble, inspect for mechanical problems or for binding that may be temperature related. Components may not move freely in extreme heat or cold due to the presence of contaminants or ice formation.
^ Inspect the TAC module connectors for signs of water intrusion. When this condition occurs, multiple DTCs could be set without circuit or component conditions found during diagnostic testing.
^ When the TAC module detects a condition within the TAC system, more than 1 TAC system-related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Be aware of this if you review the stored information in Capture Info.
^ For an intermittent, refer to Intermittent Conditions. Intermittent Conditions

TEST DESCRIPTION

Steps 1-9:

Steps 10-16:

The numbers below refer to the step numbers on the diagnostic table.
5. If the TP Indicated Angle does not follow the movement of the throttle blade, and if the TP sensor DTCs are not set, there is a mechanical condition with the throttle shaft or with the TP sensor.
16. When the TAC module detects a condition within the TAC system, more than 1 TAC system-related DTC may set. This condition is due to the many redundant tests that run continuously on this system. Locating and repairing 1 individual condition may correct more than 1 DTC. Disconnecting components during testing may set additional DTCs. Be aware of this condition if you review the stored information in Capture Info.