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Home >> Chevy Truck >> 2012 >> Express 4500 V8-6.6L DSL Turbo >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P02E7

P02E7




DTC P02E7-P02E9

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 provide an overview of each diagnostic category.

DTC Descriptors

DTC P02E7

-
Intake Air (IA) Flow Valve Position Sensor Performance

DTC P02E8

-
Intake Air (IA) Flow Valve Position Sensor Circuit Low Voltage

DTC P02E9

-
Intake Air (IA) Flow Valve Position Sensor Circuit High Voltage

Diagnostic Fault Information






Typical Scan Tool Data






Circuit/System Description

The throttle body is a normally open valve and is only operated during DPF regeneration and when maintaining the selective catalyst reduction temperature. The position of the valve 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.

A motor is used to move the valve to an open or closed position.

Conditions for Running the DTC

P02E7

* The engine speed is greater than 600 RPM for greater than 10 s.

* The engine is not in afterun mode.

* The charge air cooler temperature is less than 199°C (390°F).

* DTC P02E7 runs continuously when the above conditions are met.

P02E8 and P02E9

* The engine speed is greater than 600 RPM for greater than 10 s.

* The engine is not in afterun mode.

* DTC P02E8 and P02E9 run continuously when the above conditions are met.

Conditions for Setting the DTC

P02E7

The ECM detects that the difference between the desired throttle valve position and the actual throttle valve position is greater than 10 % for 10 s.

P02E8

The ECM detects that the throttle valve position sensor voltage is less than 0.25 V for 5 s.

P02E9

The ECM detects that the throttle valve position sensor voltage is greater than 4.75 V for 5 s.

Action Taken When the DTC Sets

P02E7

DTC P02E7 is a Type B DTC.

P02E8 and P02E9

* DTCs P02E8 and P02E9 are Type A DTCs.

* The driver information center, if equipped, may display Reduced Engine Power message.

* Diesel particulate filter (DPF) regeneration is inhibited.

Conditions for Clearing the DTC

P02E7

DTC P02E7 is a Type B DTC.

P02E8 and P02E9

DTCs P02E8 and P02E9 are Type A 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. Ignition ON, observe the scan tool DTC information. DTC P02E2, P02E3, P02EB, P0697, P122C, P122E, or P122F should not be set.

• If a DTC is set, refer to Diagnostic Trouble Code (DTC) List - Vehicle Diagnostic Trouble Code (DTC) List - Vehicle for further diagnosis.

2. Ignition ON, command the Intake Air Flow Valve Motor from 100-0 % with a scan tool. The IAF Valve Desired Position parameter and the IAF Valve Position parameter should match.

3. Engine idling, observe the scan tool IAF Valve Pos. Sensor voltage parameter. The reading should be between 3.7-4.7 V.

4. Turn OFF the ignition while observing the scan tool IA Flow Valve Position parameter. The parameter should fluctuate between 100-0 % several times.

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. Ignition OFF, 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, debris or coking

* A damaged throttle valve blade or shaft

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

2. Ignition OFF, disconnect the harness connector at the Q38 throttle body.

3. Ignition OFF and all vehicle systems OFF. It may take up to 2 minutes for all vehicle systems to power down. Test for less than 5 ohms between the low reference circuit terminal 4 and ground.

• If greater than the specified range, test the low reference circuit for an open/high resistance. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, test for 4.8-5.2 V between 5-volt reference circuit terminal 5 and ground.

• If less than the specified range, test 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

• If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. Verify the scan tool IAF valve position sensor voltage is less than 0.1 V.

• If greater than the specified range, test the signal circuit terminal 3 for a short to voltage. If the circuit tests normal, replace the K20 ECM.

6. Install a 3 A fused jumper wire between the signal circuit terminal 3 and the 5-volt reference circuit terminal 5. Verify that the scan tool IAF position sensor voltage is greater than 4.8 V.

• If less than the specified range, test the throttle body signal circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the K20 ECM.

• 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

* Perform the scan tool Diesel Particulate Filter (DPF) Regeneration Enable Diesel Particulate Filter (DPF) Regeneration Enable procedure if the scan tool DPF Soot Mass is less than 30 g. If the scan tool DPF Soot Mass is 30 g or greater, perform the Diesel Particulate Filter (DPF) Service Regeneration Diesel Particulate Filter (DPF) Service Regeneration procedure.

* Control Module References Control Module References for ECM replacement, programming and setup.

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