P1523

Circuit Description
The ECM monitors the positioning of the throttle blade. When the throttle is unable to return to its stop in a calibratable time, this DTC will set.

Conditions for Running the DTC
^ The vehicle speed is equal to 0 km/h.
^ The engine speed is less than 250 RPM.
^ The Engine Coolant Temperature (ECT) is between 5°C - 100°C (41°F - 212°F).
^ The Intake Air Temperature (IAT) is more than 5°C (41°F).

Conditions for Setting the DTC
The Engine Control Module (ECM) determines that the throttle body valve is not in the closed position.

Action Taken When the DTC Sets
The ECM illuminates the Malfunction Indicator Lamp (MIL) and records the operating conditions in the Freeze Frame on the first drive trip that the diagnostic runs and fails. The vehicle will default to the limp home mode.

Conditions for Clearing the MIL/DTC
^ The ECM turns off the MIL after 3 consecutive drive trips that the diagnostic runs and passes.
^ A history DTC clears after 40 consecutive drive trips that the diagnostic runs and passes.
^ The ECM battery voltage is interrupted.
^ The scan tool clears the MIL/DTC.

Diagnostic Aids
Inspect for a condition in which the throttle valve may have been held open. Inspect for conditions in which ice may have formed in the throttle bore.

Notice: Refer to J 35616-A Connector Test Adapter Kit Notice in Service Precautions.

Use the J 35616-A connector test adapter kit for any test that requires probing the ECM harness connector or a component harness connector.

Check for the following conditions:
^ Poor connections at the ECM or at the component-Inspect the harness connectors for a poor terminal to wire connection.
^ Damaged harness-Inspect the wiring harness for damage. If the harness appears to be OK, observe the scan tool while moving the related connectors and the wiring harnesses. A change in the display may help locate the fault.

Refer to Symptoms for Intermittents. Symptom Related Diagnostic Procedures