PRE-RELEASE
DTC P245A-P245D
| DTC P245A-P245D |
| Diagnostic Instructions |
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Perform the
Diagnostic System Check - Vehicle
prior to using this diagnostic procedure.
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Review
Strategy Based Diagnosis
for an overview of the diagnostic approach.
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Diagnostic Procedure Instructions
provides an overview of each diagnostic category.
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| DTC Descriptors |
DTC P245A 00
Exhaust Gas Recirculation (EGR) Cooler Bypass Solenoid Valve Control Circuit Open
DTC P245B 00
Exhaust Gas Recirculation (EGR) Cooler Bypass Solenoid Valve Control Circuit Malfunction
DTC P245C 02
Exhaust Gas Recirculation (EGR) Cooler Bypass Solenoid Valve Control Circuit Short to Ground
DTC P245D 01
Exhaust Gas Recirculation (EGR) Cooler Bypass Solenoid Valve Control Circuit Short to Battery
| Diagnostic Fault Information |
| Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
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Ignition
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P245A 00
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P245A 00
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-
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-
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Output Control
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P245C 02
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P245A 00
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P245D 01
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P245B 00
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| Circuit/System Description |
The exhaust gas recirculation (EGR) cooler bypass solenoid valve is controlled by the engine control module (ECM). At engine cold start, the EGR cooler bypass allows hot exhaust gas to heat the intake air in the manifold. Once the engine operating temperature is reached, the ECM will close the EGR cooler bypass.
| Conditions for Running the DTC |
Ignition is on.
| Conditions for Setting the DTC |
P245A 00
The ECM detects an open in the output circuit.P245B 00
The ECM detects a high resistance at the output circuit.P245C 02
The ECM detects a short to ground at the output circuit.P245D 01
The ECM detects a short to battery at the output circuit.| Action Taken When the DTC Sets |
DTCs P245A-P245D are Type C DTCs.
| Conditions for Clearing the DTC |
DTCs P245A-P245D are Type C DTCs.
| Reference Information |
Schematic Reference
Engine Controls Schematics
Connector End View Reference
Component Connector End Views
Electrical Information Reference
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Circuit Testing
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Connector Repairs
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Testing for Intermittent Conditions and Poor Connections
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Wiring Repairs
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DTC Type Reference
Powertrain Diagnostic Trouble Code (DTC) Type Definitions
Scan Tool Reference
Control Module References
Special Tools
EN 23738-A Mityvac
For equivalent regional tools, refer to Special Tools
| Circuit/System Verification |
| 1. |
Disconnect the vacuum source from the EGR Cooler Bypass valve.
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| 2. |
Connect the
EN 23738-A
Mityvac to the EGR Cooler Bypass valve vacuum supply hose. Engine running, verify the vacuum is greater than -50 kPa (-7.25 PSI).
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| 3. |
If less than the specified range, inspect the vacuum supply hose and filter for a leak or restriction. If the supply hose is normal, replace the vacuum pump.
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| 4. |
Connect the vacuum source to the EGR Cooler Bypass valve. Connect the
EN 23738-A
Mityvac to the EGR Cooler Bypass valve vacuum port on the EGR Cooler Bypass valve. Engine running, command the EGR Cooler Bypass valve OFF with a scan tool. Verify the vacuum is at 0 kPa (0 PSI).
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| 5. |
If greater than the specified range, replace the EGR Cooler Bypass valve.
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| 6. |
Command the EGR Cooler Bypass valve ON with a scan tool. Verify the vacuum is greater than -50 kPa (-7.25 PSI).
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| 7. |
If less than the specified range, replace the EGR Cooler Bypass valve.
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| 8. |
If all other components test normal, test or replace the EGR Cooler Bypass valve.
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| Circuit/System Testing |
| 1. |
Ignition OFF, disconnect the harness connector at the Q47 Exhaust Gas Recirculation (EGR) Cooling Bypass Valve.
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| 2. |
Ignition ON, verify that a test lamp illuminates between the ignition circuit terminal 2 and ground.
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| 3. |
If the test lamp does not illuminate, test the ignition circuit for a short to ground or an open/high resistance. If the circuit tests normal and the ignition circuit fuse is open, test or replace the Q47 Exhaust Gas Recirculation (EGR) Cooling Bypass Valve.
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| 4. |
Command the EGR Cooler Bypass Valve OFF with a scan tool, verify that a test lamp does illuminate weakly between the ignition circuit terminal 2 and the control circuit terminal 1.
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| 5. |
If the test lamp illuminates, test the control circuit for a short to ground. If the circuit tests normal, replace the K20 Engine Control Module.
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| 6. |
Command the EGR Cooler Bypass valve ON with a scan tool. Verify the test lamp corresponds to the commanded states of the scan tool.
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| 7. |
If the test lamp is always off, test the control circuit for an open circuit or short to voltage. If the circuit tests normal, replace the K20 Engine Control Module.
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| 8. |
If all circuits test normal, test or replace the Q47 Exhaust Gas Recirculation (EGR) Cooling Bypass Valve.
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| Component Testing |
Static Test
| 1. |
Ignition OFF, disconnect the harness connector at the Q47 Exhaust Gas Recirculation (EGR) Cooling Bypass Valve.
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| 2. |
Test for 25-35 Ω between the control terminal 1 and the ignition terminal 2 of the Q47 Exhaust Gas Recirculation (EGR) Cooling Bypass Valve.
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| 3. |
If not within the specified range, replace the Q47 Exhaust Gas Recirculation (EGR) Cooling Bypass Valve.
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| 4. |
Test for infinite resistance between each terminal and the Q47 Exhaust Gas Recirculation (EGR) Cooling Bypass Valve.
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| 5. |
If not the specified value, replace the Q47 Exhaust Gas Recirculation (EGR) Cooling Bypass Valve.
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| Repair Instructions |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
Exhaust Gas Recirculation Valve Cooler Replacement
