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P02E3




DTC P02E0, P02E2, P02E3, P02EB, P122C, P122E, or P122F

Diagnostic Instructions

* Perform the Diagnostic System Check - Vehicle Diagnostic System Check - Vehicle prior to using this diagnostic procedure.
* Review Strategy Based Diagnosis Strategy Based Diagnosis for an overview of the diagnostic approach.
* Diagnostic Procedure Instructions Diagnostic Procedure Instructions provides an overview of each diagnostic category.

DTC Descriptor
DTC P02E0
- Intake Air (IA) Flow Valve Control Circuit

DTC P02E2
- Intake Air (IA) Flow Valve Control Circuit Low Voltage

DTC P02E3
- Intake Air (IA) Flow Valve Control Circuit High Voltage

DTC P02EB
- Intake Air (IA) Flow Valve Control Motor Current Performance

DTC P122C
- Intake Air (IA) Flow Valve Control Circuit Shorted

DTC P122E
- Intake Air (IA) Flow Valve Control Circuit 2 Low Voltage

DTC P122F
- Intake Air (IA) Flow Valve Control Circuit 2 High Voltage

Diagnostic Fault Information






Circuit/System Description

The throttle body is a normally open valve and is only operated during Diesel Particulate Filter (DPF) regeneration and when maintaining selective catalyst reduction temperature. The position of the throttle body is controlled by the Engine Control Module (ECM). The throttle body system uses a position sensor located within the valve assembly to monitor the position of the valve.

The throttle body uses a motor to move the valve to an open or closed position.

Conditions for Running the DTC

P02E0
* The ignition is OFF.
* The engine is in after-run.
* The battery voltage is greater than 11 V.
* The throttle valve motor control circuit is active.
* The DTC runs continuously whenever the above conditions are met.

P02E2, P02E3, P02EB, P122C, P122E and P122F
* The battery voltage is greater than 11 V.
* The Engine is running.
* The throttle valve motor control circuit is active.
* The DTCs run continuously whenever the above conditions are met.

Conditions for Setting the DTC

P02E0

The ECM detects an open circuit condition or an over temperature condition of the throttle valve control circuit internal to the ECM for greater than 3 s.

P02E2

The ECM detects that the throttle valve control circuit voltage is less than a calibrated threshold for greater than 3 s.

P02E3

The ECM detects that the throttle valve control circuit voltage is greater than a calibrated threshold for greater than 3 s.

P02EB

The ECM detects a short circuit condition of the throttle valve motor control circuits for greater than 2 s.

P122C

The ECM detects a short circuit on the throttle valve control circuit voltage for greater than 3 s.

P122E

The ECM detects that the throttle valve control circuit 2 voltage is less than a calibrated threshold for greater than 3 s.

P122F

The ECM detects that the throttle valve control circuit 2 voltage is greater than a calibrated threshold for greater than 3 s.

Action Taken When the DTC Sets

DTC P02E0, P02E2, P02E3, P02EB, P122C, P122E and P122F are Type B DTCs.

Conditions for Clearing the DTC

DTC P02E0, P02E2, P02E3, P02EB, P122C, P122E and P122F are Type B DTCs.

Reference Information
Schematic Reference

Engine Controls Schematics [1][2]Electrical Diagrams
Connector End View Reference

Component Connector End Views 1-2 Shift Solenoid (SS) Valve (M30)
Electrical Information Reference

* Circuit Testing Circuit Testing
* Connector Repairs Connector Repairs
* Testing for Intermittent Conditions and Poor Connections Testing for Intermittent Conditions and Poor Connections
* Wiring Repairs Wiring Repairs

DTC Type Reference

Powertrain Diagnostic Trouble Code (DTC) Type Definitions Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference

Control Module References Control Module References for scan tool information

Circuit/System Verification

1. Engine idling, observe the scan tool IAF Valve Pos. Sensor voltage parameter. The reading should be between 3.7-4.7 V.
2. Turn OFF the ignition while observing the scan tool IAF Valve Position parameter. The parameter should fluctuate between 0 % and 100 % several times.
3. Engine running, observe the following scan tool IAF control circuit status parameters:

* IAF Valve Ctrl Ckt 1-2 Short Volts Test Status
* IAF Valve Ctrl Ckt 1-2 Short Gnd Test Status
* IAF Valve Ctrl Ckt Open Test Status
* IAF Valve Ctrl Ckt Shorted Test Status
Each parameter should display OK or Not Run.

4. Engine running, observe the following scan tool IAF control circuit status parameters:

* IAF Valve Ctrl Drvr Low Voltage
* IAF Valve Ctrl Drvr High Current
* IAF Valve Ctrl Drvr Temp Dependent High Current
* IAF Valve Ctrl Drvr High Temp
Each parameter should display NO.

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.

Circuit/System Testing

1. Inspect the Q38 throttle body for the following conditions:

* A throttle blade that is not in the rest position
* A throttle blade that is binding open or closed
* A throttle blade that opens or closes without spring pressure
* Throttle body for dirt or debris
* A worn or damaged throttle valve body, blade or shaft

• If a condition is found, clean or replace the Q38 throttle body as necessary.

2. Ignition OFF, disconnect the harness connector at the Q38 throttle body.
3. Ignition ON, connect a test lamp between control circuit terminal 1 and ground. The test lamp should illuminate.

• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K20 Engine Control Module.

4. Ignition ON, connect a test lamp between control circuit terminal 2 and ground. The test lamp should illuminate.

• If the test lamp does not illuminate, test the control circuit for a short to ground or an open/high resistance. If the circuits test normal, replace the K20 ECM.

5. Ignition OFF, disconnect the harness connector X3 at the K20 ECM.
6. Ignition ON, connect a test lamp between the control circuit terminal 1 and ground. The test lamp should NOT illuminate.

• If the test lamp illuminates, test the control circuit for a short to voltage. If the circuits test normal, replace the K20 ECM.

7. Ignition ON, connect a test lamp between the control circuit terminal 2 and ground. The test lamp should NOT illuminate.

• If the test lamp illuminates, test the control circuit for a short to voltage. If the circuits test normal, replace the K20 ECM.

8. If all circuits test normal, replace the Q38 throttle body.

Repair Instructions

Perform the Diagnostic Repair Verification Verification Tests after completing the diagnostic procedure.

* Throttle Body Assembly Replacement Service and Repair
* Control Module References Control Module References for ECM replacement, programming and setup.

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