Dodge Repair Questions? Ask a Mechanic for Answers ASAP
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I will send you the diagnostic steps for this code. You will need to do some tests to diagnose this code.
NOTE: When only one O2 Sensor is shorted to voltage, the scan tool will display all O2 Sensor voltage readings at approximately 5.0 volts. When diagnosing this DTC, only diagnose the O2 Sensor that set the DTC.
Start the engine.
Allow the engine to reach normal operating temperature.
With a scan tool, read the 2/2 O2 Sensor voltage.
Is the voltage above 3.99 volts?
Fig 2: Checking O2 Sensor Signal Circuit
Start the engine and allow the engine to idle.
Disconnect the 2/2 O2 Sensor harness connector.
Measure the voltage on the (K243) O2 Sensor 2/2 Signal circuit in the O2 Sensor harness connector.
NOTE: Measure the voltage in reference to ground, not the (K904) O2 Return Downstream circuit.
Is the voltage above 0 volts?
Fig 3: Checking O2 Sensor Return Upstream & Downstream Circuits
Turn the ignition off.
Disconnect the C2 PCM harness connector.
Ignition on, engine not running.
Measure the voltage on the (K904) O2 Return Downstream circuit in the 2/2 O2 Sensor harness connector.
Is there any voltage present?
Fig 4: Checking O2 Sensor Return Upstream & Downstream Circuits
Connect the C2 PCM harness connector.
Connect a jumper wire between the (K243) O2 2/2 Signal circuit and the (K904) O2 Return Downstream circuit in the 2/2 O2 Sensor harness connector.
With a scan tool, monitor the 2/2 O2 Sensor voltage.
Is the voltage between 2.3 and 2.7 volts with the jumper wire installed?
NOTE: Remove the jumper wire before continuing.
Fig 5: Checking O2 2/2 Sensor Signal Circuit For Open
Disconnect the C1 and C2 PCM harness connectors.
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.
Measure the resistance of the (K243) O2 2/2 Signal circuit from the O2 Sensor harness connector to the appropriate terminal of special tool #8815.
Is the resistance below 5.0 ohms?
Fig 6: Checking O2 Return Circuit Open
Measure the resistance of the (K904) O2 Return Downstream circuit from the O2 Sensor harness connector to the appropriate terminal of special tool #8815.
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.
Were there any problems found?
You need to find out which cylinders are misfiring. While the engine is at idle, unplug the injector connectors or the coil packs one at a time, if the rpm changes you know the cylinder is firing. If no change then you found the cylinder.
Yes an egr valve could cause this. Vacuum leaks, mass air flow or map sensor would affect all cylinders as well.
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