Orlando

DTC P2072

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.

The ECM detects the throttle blade is stuck open or stuck closed for 1 s.

DTC P2072 is a Type A DTC.

DTC P2072 is a Type A DTC.

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.

Electrical Information Reference

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Scan Tool Reference

Control Module References for scan tool information

Description and Operation

Throttle Actuator Control (TAC) System Description

1. Ignition ON, observe the DTC information with a scan tool. DTCs P0121, P0122, P0123, P0221, P0222, or P0223 should not set.

⇒	If any DTCs are set, refer to DTC P0068, P0121, or P0221 , or DTC P0122, P0123, P0222, or P0223 .

2. Verify scan tool parameter Throttle Position Sensor 1 voltage is between 0.4-0.9 V, and scan tool parameter Throttle Position Sensor 2 is between 4.1-4.7 V.

⇒	If not within the specified range, refer to DTC P0068, P0121, or P0221 or DTC P0122, P0123, P0222, or P0223 for further diagnosis.

3. Rapidly depress the accelerator pedal from the rest position to the wide open throttle position (WOT) and release pedal. Repeat the procedure several times. DTC P2072 should not set.

⇒	If DTCs P0121, P0122, P0123, P0221, P0222, or P0223 set while performing this procedure, refer to DTC P0068, P0121, or P0221 or DTC P0122, P0123, P0222, or P0223 .

4. Slowly depress the accelerator pedal to WOT and then slowly return the pedal to closed throttle. Repeat the procedure several times. DTC P2072 should not set.

⇒	If DTCs P0121, P0122, P0123, P0221, P0222, or P0223 set while performing this procedure, refer to DTC P0068, P0121, or P0221 or DTC P0122, P0123, P0222, or P0223 .

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.

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

•	A throttle blade that is not in the rest position

•	A throttle valve that opens or closes without spring pressure

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

2. Ignition OFF, disconnect the harness connector at the Q38 Throttle Body. Allow sufficient time for the K20 Engine Control Module to completely power down.
3. Ignition OFF, test for less than 5 Ω between the Q38 Throttle Body harness connector low reference circuit terminal 6 and ground.

⇒	If greater than 5 Ω, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

4. Ignition ON, test for 4.7-5.2 V between the Q38 Throttle Body harness connector 5 V reference circuit terminal 2 and ground.

⇒	If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

⇒	If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.

5. Test for 4.7-5.2 V between the Q38 Throttle Body harness connector throttle position sensor 1 signal circuit terminal 1 and ground.

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

6. Test for less than 0.3 V between the Q38 Throttle Body harness connector throttle position sensor 2 signal circuit terminal 4 and ground.

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

7. Install a 3 A fused jumper wire between Q38 Throttle Body harness connector throttle position sensor 1 signal circuit terminal 1 and the low reference circuit terminal 6. Verify the scan tool Throttle Position Sensor 1 voltage parameter is less than 0.1 V.

⇒	If greater than the specified range, test the signal circuit for a short to voltage, or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module.

8. Install a 3 A fused jumper wire between Q38 Throttle Body harness connector throttle position sensor 2 signal circuit terminal 4 and the 5 V reference circuit terminal 2. Verify the scan tool Throttle Position Sensor 2 voltage parameter is greater than 4.7 V.

⇒	If less than the specified range, test the signal circuit for a short to ground, or an open/high resistance. If the circuit tests normal, replace the K20 Engine Control Module

9. Ignition OFF, disconnect the ECM X2 harness connector at the K20 Engine Control Module.
10. Test for less than 5 Ω on all Q38 Throttle Body harness connector throttle position sensor circuits between the following terminals:

•	The 5 V reference circuit terminal 2 to the corresponding ECM terminal X2-39.

•	The throttle position sensor 2 signal circuit terminal 4 to the corresponding ECM terminal X2-61

•	The throttle position sensor 1 signal circuit terminal 1 to the corresponding ECM terminal X2-56

⇒	If greater than 5 Ω, repair the affected circuit.

11. Test for infinite resistance between Q38 Throttle Body throttle position sensor 1 signal circuit terminal 1 and throttle position sensor 2 signal circuit terminal 4.

⇒	If less than infinite resistance, repair the short between Q38 Throttle Body throttle position sensor 1 signal circuit and throttle position sensor 2 signal circuit.

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

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.