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P245C




DTC P1411-P1414, P245A, P245C, or P245D

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 P1411
- Exhaust Gas Recirculation (EGR) Cooler Bypass Valve Control Circuit 2 Low Voltage

DTC P1412
- Exhaust Gas Recirculation (EGR) Cooler Bypass Valve Control Circuit 2 High Voltage

DTC P1413
- Exhaust Gas Recirculation (EGR) Cooler Bypass Valve Control Circuit Shorted

DTC P1414
- Exhaust Gas Recirculation (EGR) Cooler Bypass Valve Current Performance

DTC P245A
- Exhaust Gas Recirculation (EGR) Cooler Bypass Valve Control Circuit

DTC P245C
- Exhaust Gas Recirculation (EGR) Cooler Bypass Valve Control Circuit Low Voltage

DTC P245D
- Exhaust Gas Recirculation (EGR) Cooler Bypass Valve Control Circuit High Voltage

Diagnostic Fault Information






Circuit/System Description

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

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

Conditions for Running the DTC

P1411, P1412, P1413, P1414, P245C and P245D
* The Ignition is ON.
* The battery voltage is greater than 11 V.
* The EGR cooler bypass valve control circuit is active.
* The starter is not cranking.
* The DTCs run continuously when the above conditions are met.

P245A
* The Ignition is OFF.
* The engine is in after-run/post drive.
* The battery voltage is greater than 11 V.
* The EGR cooler bypass valve offset learning procedure is complete.
* The EGR cooler bypass valve control circuit 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.

Conditions for Setting the DTC

P1411

The ECM detects that the EGR cooler bypass valve low, close, control circuit voltage is less than a calibrated threshold for greater than 3 s.

P1412

The ECM detects that the EGR cooler bypass valve low, close, control circuit voltage is greater than a calibrated threshold for greater than 3 s.

P1413

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

P1414

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

P245A
* The ECM detects an open circuit condition of the EGR cooler bypass valve control circuit internal to the ECM for greater than 3 s.
OR
* The ECM detects an over temperature condition of the EGR cooler bypass valve control circuit internal to the ECM for greater than 3 s.

P245C

The ECM detects that the EGR cooler bypass valve high, open, control circuit voltage is less than a calibrated threshold for greater than 3 s.

P245D

The ECM detects that the EGR cooler bypass valve high, open, control circuit voltage is greater than a calibrated threshold for greater than 3 s.

Action Taken When the DTC Sets

DTCs P1411-P1414, P245A, P245C, and P245D are Type B DTCs.

Conditions for Clearing the DTC

DTCs P1411-P1414, P245A, P245C, and P245D 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 running, observe the scan tool Des. EGR Cooler Bypass Valve Position and the EGR Cooler Bypass Valve Position Sensor parameters. Command the EGR Cooler Bypass Valve from 0 to 100 % with a scan tool. The parameters should increment and remain within 3 % throughout the commanded range.
2. Engine Running, observe the scan tool EGR control circuit status parameters listed below. Each parameter should display OK or Not Run.

* EGR Cooler Bypass Vlv Ctrl. Ckt. 1 Short Gnd Test Status
* EGR Cooler Bypass Vlv Ctrl. Ckt. 2 Short Gnd Test Status
* EGR Cooler Bypass Vlv Ctrl. Ckt. 1 Short Volts Test Status
* EGR Cooler Bypass Vlv Ctrl. Ckt. Shorted Test Status
* EGR Cooler Bypass Vlv Ctrl. Ckt. 2 Short Volts Test Status

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 Q47 EGR cooler bypass solenoid valve.
2. Ignition ON, verify that a test lamp illuminates between the Motor Open Control circuit terminal 6 and ground.

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

Note: The test lamp may turn ON and OFF several times and then remain illuminated until the ECM powers down.

3. Ignition OFF and scan tool powered down, verify the test lamp turns off within 5 s.

• If the lamp does not respond as specified, test the EGR Motor Open Control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

4. Ignition ON, connect a test lamp between the Motor Close Control circuit terminal 2 and ground.
5. Ignition OFF and scan tool powered down, the test lamp should turn OFF within 5 s and then turn back ON until the ECM powers down.

• If the test lamp does not illuminate, test the EGR bypass 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 remains ON continuously or until the ECM powers down, test the EGR bypass motor close control circuit for a short to voltage. If the circuit tests normal, replace the K20 ECM.

6. If all circuits test normal, replace the Q47 EGR cooler bypass solenoid valve.

Repair Instructions

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

* Exhaust Gas Recirculation Cooler Bypass Valve Replacement Exhaust Gas Recirculation Cooler Bypass Valve Replacement
* Control Module References Control Module References for ECM replacement, setup, and programming.

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