P2457

P2457-EXHAUST GAS RECIRCULATION COOLING SYSTEM PERFORMANCE

For a complete wiring diagram, refer to the Wiring Information Electrical Diagrams.

Theory of Operation

This test will fail if the EGR Temperature is greater than a calibrated threshold for a calibrated period of time when the EGR Bypass Valve is closed. This monitor protects the system from a failed EGR Cooler.

- When Monitored:
Engine running and vehicle speed greater than 10 MPH.

- Set Condition:
Exhaust gas recirculation temperature sensor is reading higher than a calibrated value for more than a calibrated period of time.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. OTHER DTCS
1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Are there any coolant temperature, fuel system or EGR system DTCs?

Yes

- Repair other DTCs before proceeding.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Go To 2

2. ENGINE OR FUEL MODIFICATIONS THAT EXCEED OEM SPECIFICATIONS
1. Inspect vehicle/engine for signs of Engine or Fuel modifications that exceed OEM specifications.

Are there signs the customer installed a modification kit that exceed OEM specifications?

Yes

- Return vehicle to customer. Explain that modifying the engine hardware/software may cause the engine to run outside of its normal operating limits.

No

- Go To 3

3. COOLANT LEVEL
1. Turn the ignition off.
2. With the engine cold, check the coolant level in the cooling system.

Is the cooking system full?

Yes

- Go To 4

No

- Fill the cooling system to the proper level.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

4. EXHAUST GAS RECIRCULATION TEMPERATURE SENSOR
1. Ignition off.
2. Disconnect the EGR Temperature Sensor harness connector.

NOTE: Check connectors - Clean/repair as necessary.

3. Remove the Temperature Sensor and reconnect the wiring harness connector to the sensor.
4. Turn the Ignition on, engine off.
5. Monitor scan tool, while heating the sensor with an external heat source (DO NOT USE OPEN FLAME).

Does the reading from the sensor increase at least 2.78 C (5 F) on the scan tool?

Yes

- Go To 5

No

- Replace EGR Temperature Sensor.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

5. EGR COOLER
1. Remove and clean the EGR Cooler with approved Mopar EGR system cleaner.
2. Reinstall the EGR Cooler.
3. With the scan tool, erase DTCs.
4. Turn the ignition off for 30 seconds.
5. Start the engine.
6. Test drive the vehicle. With the scan tool in Data Display, verify that the engine operating mode is normal.
7. With the scan tool, read DTCs.

Did the DTC reset?

Yes

- Replace the EGR Cooler.
- Perform the POWERTRAIN VERIFICATION TEST - 6.7L. Powertrain Verification Test.

No

- Repair complete