P2176

DTC P2176

CIRCUIT DESCRIPTION




The engine control module (ECM) determines the minimum throttle position each time the ignition is turned on. In order to learn this position, the ECM moves the throttle plate to the closed position. If the ECM determines the throttle plate is not moving to the fully closed position during this learn procedure, DTC P2176 will set.

CONDITIONS FOR RUNNING THE DTC
- The ignition is ON.
- The ignition voltage is more than 5.25 volts.

CONDITIONS FOR SETTING THE DTC
The ECM detects that the throttle plate did not return to the minimum position during learn procedure.

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.
- Clear the MIL and the DTC with a scan tool.

DIAGNOSTIC AIDS
Inspect for mechanical conditions 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.

TEST

Steps 1 - 8: