P1523

Circuit Description

During Battery Saver Mode the TAC module determines if the throttle plate is returning to the correct de-energized position. If this fault is detected the TAC module sends a message to the PCM across serial data and this DTC is set.

Conditions for Running the DTC

^ DTC P1518 is not set.
^ The ignition switch is ON and the engine is off.
^ The ignition voltage is greater than 8.5 volts.
^ Battery Saver Mode is active.

Conditions for Setting the DTC

^ The TAC module detects that the commanded and actual throttle positions are not within a calibrated range of each other.
^ All above conditions met for less than 2 seconds.

Action Taken When the DTC Sets

^ The PCM will not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM will store conditions which were present when the DTC set as Fail Records data only. This information will not be stored as Freeze Frame data.

Conditions for Clearing the MIL/DTC

^ A history DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
^ DTC can be cleared by using the scan tool Clear Info function.

Diagnostic Aids

Important: Remove any debris from the connector surfaces before servicing a component. Inspect the connector gaskets when diagnosing/replacing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

^ If you do not find any trouble, check for mechanical problems or 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.
^ The following may cause an intermittent:
- Poor connections. Check for adequate terminal tension. Refer to Intermittent and Poor Connections for the proper procedure. Intermittent Conditions
- Corrosion
- A mis-routed harness
- A rubbed through wire insulation
- Broken wire inside of the insulation
- Inspect the connectors for signs of water intrusion. When this occurs, multiple DTCs should be set and no circuit or component problems can be located.
^ For an intermittent condition, refer to Symptoms. Symptom Related Diagnostic Procedures
^ If a repair is completed and the DTC was cleared by using a scan tool on the same ignition cycle, the default action will not clear until an ignition cycle has occurred.
^ When the TAC module detects a problem within the ETC System the PCM receives a message across serial data and more than one ETC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info.

Test Description

The numbers below refer to the step numbers on the Diagnostic Table.

8. When the TAC module detects a problem within the ETC System the PCM receives a message across serial data and more than one ETC System related DTC may set. This is due to the many redundant tests run continuously on this system. Locating and repairing one individual problem may correct more than one DTC. Keep this in mind when reviewing captured DTC info.