Cruze

DTC P1104 - LDE or LLU

The engine control module (ECM) is the control center for the throttle body throttle actuator control (TAC) system. The ECM determines the drivers intent and then calculates the appropriate throttle response. The ECM achieves throttle positioning by providing a pulse width modulated voltage to the throttle body (TAC) motor. The throttle body (TAC) motor system uses the following circuits:

Two processors are also used to monitor the throttle body (TAC) motor system data. Both processors are located within the ECM. Both processors monitor each others data to verify that the indicated throttle position is correct.

P1104 00

P1104 00

The indicated throttle position does not match the predicted throttle position for more than 0.5 s.

DTCs P1104 00 is a Type B DTC.

DTCs P1104 00 is a Type B DTC.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

1. Ignition ON, engine OFF, use a scan tool to observe the throttle position sensor 1 indicated position. Throttle position should increase as pedal is applied and decrease as pedal is released. When no accelerator pedal activity is detected, the throttle position will return to the spring loaded default position.

Note: A low voltage condition may set this DTC.

2. Review the freeze frame/failure records and ensure sufficient ignition voltage was present when the DTC was set.

⇒	If voltage was low, verify with the owner that the battery was not discharged. If the battery has not been discharged, refer to Power Mode Mismatch .

3. Operate the vehicle within the conditions for running the DTC. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Warning: Turn OFF the ignition before inserting fingers into the throttle bore. Unexpected movement of the throttle blade could cause personal injury.

1. Inspect the Q38 Throttle Body for the following conditions:

•	A throttle blade that is not in the rest position

•	A throttle valve that is binding open or closed

•	A throttle valve that opens or closes without spring pressure

⇒	If a condition is found, replace the Q38 Throttle Body.

Note: Disconnecting the throttle body harness connector causes additional DTCs to set.

2. Ignition OFF, disconnect the harness connector of the Q38 Throttle Body.
3. Verify that a test lamp does not illuminate between Q38 Throttle Body motor control 1 circuit terminal A or Q38 Throttle Body motor control 2 circuit terminal B and ground.

⇒	If the test lamp illuminates, test the appropriate Q38 Throttle Body motor control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

4. Disconnect the harness connector X2 from the K20 Engine Control Module.
5. Verify that a test lamp does not illuminate between Q38 Throttle Body motor control 1 circuit terminal A or Q38 Throttle Body motor control 2 circuit terminal B and ground.

⇒	If the test lamp illuminates, test the appropriate Q38 Throttle Body motor control circuit for a short to voltage.

6. Connect the harness connector X2 on the K20 Engine Control Module.
7. Ignition ON, Verify that a test lamp illuminates between Q38 Throttle Body motor control 1 circuit terminal A or Q38 Throttle Body motor control 2 circuit terminal B and ground.

⇒	If the test lamp does not illuminate, test the appropriate Q38 Throttle Body motor control circuit for an open circuit or a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.

8. If all circuits test normal, replace the Q38 Throttle Body.

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.