Diagnostic Instructions
| • | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
| • | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
| • | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
DTC Descriptors
DTC P2100 04: Intake Air Flow Valve Control Circuit OpenDTC P2102 02: Intake Air Flow Valve Control Circuit Short to Ground
DTC P2103 01: Intake Air Flow Valve Control Circuit Short to Battery
Diagnostic Fault Information
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
|---|---|---|---|---|
Control X | P2102 02, P2101 03 | P2100 04, P2101 54 | P2103 01 | P2101 59, P2101 39, P2101 51, P2101 52 |
Control Y | P2102 02, P2101 03 | P2100 04, P2101 54 | P2103 01 | P2101 59, P2101 39, P2101 51, P2101 52 |
Circuit/System Description
A throttle plate actuator is used to achieve high exhaust gas recirculation rates. It increases the pressure difference between exhaust and intake so that the appropriate exhaust quantity can be mixed with the intake air. The engine control module (ECM) transmits the desired angle as a PWM signal to the throttle plate actuator. The throttle plate actuator operates the DC motor to control the throttle plate based on the PWM signal from the ECM. The throttle plate position is monitored by an internal position sensor.
Conditions for Running the DTC
| • | The ignition is ON, or the engine is running. |
| • | The throttle actuator motor is commanded ON or OFF. |
| • | The ignition voltage is less than 16 V. |
| • | The DTCs run continuously when the above conditions are met. |
Conditions for Setting the DTC
The ECM detects an open, short to ground, or a short to voltage on the throttle actuator control circuit for greater than 1 s.
Action Taken When the DTC Sets
DTCs P2100, P2102 and P2103 are Type A DTCs.
Conditions for Clearing the DTC
DTCs P2100, P2102 and P2103 are Type A DTCs.
Reference Information
Schematic Reference
Connector End View Reference
Electrical Information Reference
DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References for scan tool information
Circuit/System Verification
- Ignition ON, command the Q38 Throttle Body ON and OFF with a scan tool. The throttle blade should respond to the scan tool commands.
- Observe the scan tool DTC information parameter. DTCs P2100, P2101, P2102 or P2103 should not set.
- 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.
Circuit/System Testing
- Ignition OFF, disconnect the harness connector at the Q38 Throttle Body.
- Test for less than 5 Ω between the control circuit terminal 2 and ground.
- Test for less than 5 Ω between the control circuit terminal 6 and ground.
- Connect a test lamp between control circuit terminal 2 and control circuit terminal 6.
- Command the Intake Air Flow Valve Position ON and OFF with a scan tool. The test lamp should respond to the scan tool commands.
- If all circuits test normal, replace the Q38 Throttle Body.
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the K20 Engine Control Module (ECM). |
| ⇒ | If greater than the specified range, test the control circuit for a short to voltage or an open/high resistance. If the circuits test normal, replace the K20 Engine Control Module (ECM). |
| ⇒ | If the test lamp remains OFF during either of the commands, test for a short to ground on either control circuit. If the circuits test normal, replace the K20 Engine Control Module (ECM). |
Repair Instructions
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
| • | Control Module References for ECM replacement, setup, and programming |
