Cruze

DTC P1516, P2101, or P2119

The engine control module (ECM) controls the throttle valve by applying a varying voltage to the control circuits of the throttle actuator control (TAC) motor. The ECM monitors the duty cycle that is required to actuate the throttle valve. The ECM monitors the throttle position sensors 1 and 2 to determine the actual throttle valve position.

P1516 00

P2101 00

P2119 00

P1516 00

The ECM detects the difference between the actual throttle position, and the desired position is greater than 5% for 30 s.

P2101 00

The ECM detects the difference between the actual throttle position, and the desired position is greater than 8% for 1.5 s.

P2119 00

The ECM detects that the throttle blade did not return to the default position, during power down, within a calibrated amount of time.

Inspect for a condition in which the throttle valve may have been held open. For example, ice may have formed in the throttle bore causing the throttle valve not to close.

Schematic Reference

Engine Controls Schematics

Connector End View Reference

Component Connector End Views

Description and Operation

Refer to Throttle Actuator Control (TAC) System Description

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, observe the DTC information with a scan tool. Verify DTCs P0122 00, P0123 00, P0222 00, or P0223 00 should not set.

⇒	If any of the DTCs are set refer to DTC P0122, P0123, P0222, P0223, or P2135 for further diagnosis.

2. Ignition ON, observe the scan tool Throttle Position Sensor percentage parameters with a scan tool. Verify the scan tool Throttle Position sensor parameters are between 7-21%.

⇒	If not within the specified range, refer to DTC P0122, P0123, P0222, P0223, or P2135 for further diagnosis.

3. Rapidly depress the accelerator pedal from the rest position to the wide open throttle position and release pedal. Repeat the procedure several times. DTCs P1516 00, P2101 00, or P2119 00 should not set.

⇒	If DTCs P0122 00, P0123 00, P0222 00, P0223 00, or P2135 00 set while performing this procedure, refer to DTC P0122, P0123, P0222, P0223, or P2135 for further diagnosis.

4. Slowly depress the accelerator pedal to wide open throttle and then slowly return the pedal to closed throttle. Repeat the procedure several times. DTCs P1516 00, P2101 00, or P2119 00 should not set.

⇒	If DTCs P0122 00, P0123 00, P0222 00, P0223 00, or P2135 00 set while performing this procedure, refer to DTC P0122, P0123, P0222, P0223, or P2135 for further diagnosis.

5. Operate the vehicle within the conditions for running the DTC to verify the DTC does not reset. You may also operate the vehicle within the conditions that you observed from the freeze frame/failure records data.

Note: Disconnecting the Q38 Throttle Body harness connector causes additional DTCs to set.

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 any condition is found, replace the Q38 Throttle Body.

2. Ignition OFF, disconnect the harness connector at the Q38 Throttle Body.
3. Ignition ON, test for less than 0.5 V on the Q38 Throttle Body motor control 1 circuit terminal A and Q38 Throttle Body motor control 2 circuit terminal B.

⇒	If greater than the specified range, test the appropriate motor control circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

4. Ignition OFF, probe the Q38 Throttle Body motor control 1 circuit terminal A and Q38 Throttle Body motor control 2 circuit terminal B with a test lamp connected to B+. Verify the test lamp does not illuminate.

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

5. Connect the test lamp between the Q38 Throttle Body motor control 1 circuit terminal A and Q38 Throttle Body motor control 2 circuit terminal B. Observe the test lamp while turning the ignition ON for 5 s and then OFF. Verify the test lamp illuminates.

⇒	If the test lamp does not illuminate, test each Q38 Throttle Body motor control circuit for an open or for a short between the Q38 Throttle Body motor control 1 and Q38 Throttle Body motor control 2 circuits. If the circuit tests normal, replace the K20 Engine Control Module.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.