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P140D




DTC P0403, P0489, P0490, P1407, P140D, P140E, or P140F

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 Descriptors
DTC P0403
- Exhaust Gas Recirculation (EGR) Motor Control Circuit

DTC P0489
- Exhaust Gas Recirculation (EGR) Motor Control Circuit 1 Low Voltage

DTC P0490
- Exhaust Gas Recirculation (EGR) Motor Control Circuit 1 High Voltage

DTC P1407
- Exhaust Gas Recirculation (EGR) Motor Control Circuit Shorted

DTC P140D
- Exhaust Gas Recirculation (EGR) Motor Control Circuit 2 Low Voltage

DTC P140E
- Exhaust Gas Recirculation (EGR) Motor Control Circuit 2 High Voltage

DTC P140F
- Exhaust Gas Recirculation (EGR) Motor Current Performance

Diagnostic Fault Information





Circuit/System Description

The ECM uses the Exhaust Gas Recirculation (EGR) position sensor to determine the position of the EGR valve. The ECM sends a reference voltage through the 5 V reference circuit to the EGR position sensor. The ECM provides a voltage return path for the sensor through the low reference circuit. A variable voltage signal, based on the EGR valve position, is sent from the sensor to the ECM through the EGR position sensor signal circuit. The ECM compares the actual EGR position with the desired EGR position when the EGR valve is commanded open or closed.

The EGR valve is controlled by the ECM through the EGR motor high control and the EGR motor low control circuits. The ECM will pulse width modulate the low control circuit to ground when EGR is desired.

Conditions for Running the DTC

P0403
* The Ignition is OFF.
* The engine is in after-run.
* The battery voltage is greater than 11 V.
* The EGR valve offset learning procedure is active.
* The starter is not cranking.
* The DTC runs continuously when the above conditions are met.

OR

* The Ignition is ON.
* The battery voltage is greater than 11 V.
* The EGR control circuit is active.
* The starter is not cranking.
* The DTC runs continuously when the above conditions are met.

P0489, P0490, P1407, P140D, P140E and P140F
* The Ignition is ON.
* The battery voltage is greater than 11 V.
* The EGR control circuit is active.
* The starter is not cranking.
* The DTCs run continuously when the above conditions are met.

Conditions for Setting the DTC

P0403
* The ECM detects an open circuit condition of an EGR motor control circuit for greater than 3 s.
OR
* The ECM detects an over temperature condition of the EGR control circuit internal to the ECM for greater than 3 s.

P0489

The ECM detects that the EGR Valve High (Open) control circuit voltage is less than a calibrated threshold for greater than 3 s.

P0490

The ECM detects that the EGR Valve High (Open) control circuit voltage is greater than a calibrated threshold for greater than 3 s.

P1407

The ECM detects a short circuit condition of the EGR Valve motor control circuits for greater than 3 s.

P140D

The ECM detects that the EGR Valve Low (Close) control circuit voltage is less than a calibrated threshold for greater than 3 s.

P140E

The ECM detects that the EGR Valve Low (Close) control circuit voltage is greater than a calibrated threshold for greater than 3 s.

P140F

The ECM detects that the EGR Valve control circuit current is greater than a calibrated threshold for greater than 2 s.

Action Taken When the DTC Sets

DTCs P0403, P0489, P0490, P1407, P140D, P140E and P140F are Type B DTCs.

Conditions for Clearing the DTC

DTCs P0403, P0489, P0490, P1407, P140D, P140E and P140F are Type B DTCs.

Reference Information
Schematic Reference

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

Component Connector End Views (Connector End Views By Name)
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 (Programming and Relearning)

Circuit/System Verification

1. Ignition ON, observe the scan tool EGR Position Sensor and the Commanded State parameters. Command the EGR Valve from 0 to 40 % with a scan tool. The parameters should remain within 3 % throughout the commanded range.
2. Engine Running, observe the following scan tool EGR control circuit status parameters:

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

3. 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, disconnect the harness connector at the Q14 EGR Valve.
2. Ignition ON, connect a test lamp between the EGR Motor Open Control circuit terminal 6 and ground. The test lamp should not illuminate.

• If the test lamp illuminates, test the Motor Open Control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

3. Command the EGR Motor to 10 % with a scan tool. The test lamp should illuminate.

• If the lamp does not illuminate, test the EGR Motor Open Control circuit for an open/high resistance or short to ground and the EGR Motor Close Control circuit for a short to ground or a short to voltage. If the circuits test normal, replace the K20 ECM.

4. Ignition ON, connect a test lamp between the EGR Motor Close Control circuit terminal 2 and ground and command the EGR Motor from 0-90 % with a scan tool. The test lamp should illuminate and decrease in intensity with each increase in command.

• If the test lamp does not illuminate, test the EGR Motor Close Control circuit for an open/high resistance or a short to ground. If the circuit tests normal, replace the K20 ECM.
• If the test lamp illuminates but does not respond to the scan tool commands as specified, test the EGR Motor Close Control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

5. If all circuits test normal, replace the Q14 EGR Valve.

Repair Instructions

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

* Exhaust Gas Recirculation Valve Replacement (Exhaust Gas Recirculation Valve Replacement)
* Control Module References (Programming and Relearning)for ECM replacement, programming and setup

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