Diagnostic Test

INTAKE SYSTEM LEAK OR RESTRICTION
NOTE: This DTC will set due to poor engine performance as well as a faulty O2 Sensor. If the vehicle exhibits any fuel system or driveability issues, or has any other driveability DTCs present, repair those concerns before proceeding with this test.
1. Turn the ignition off.
2. Perform a thorough inspection of the intake system. Look for any leaks or restrictions. Pay special attention to the Charge Air Cooler and hoses.
  Were any leaks or restrictions found?
  
  Yes
  - Repair the leak or restriction in the intake system.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
  No
  - Go to step 2
EXHAUST SYSTEM LEAK OR RESTRICTION
1. Perform a thorough inspection of the exhaust system. Look for any leaks or restrictions.
  Were any leaks or restrictions found?
  
  Yes
  - Repair the leak or restriction in the exhaust system.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
  No
  - Go to step 3
POOR EGR SYSTEM PERFORMANCE
1. Perform the CHECKING THE EGR SYSTEM performance test. Refer to Non-DTC Diagnostics/Driveability - Diesel - Diagnosis and Testing .
  Is the EGR system operating properly?
  
  Yes
  - Go to step 4
  No
  - Repair the EGR System as needed.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
POOR FUEL SYSTEM PERFORMANCE
1. Perform the CHECKING THE FUEL DELIVERY SYSTEM and CHECKING THE HIGH-SIDE FUEL PRESSURE performance tests. Refer to Non-DTC Diagnostics/Driveability - Diesel - Diagnosis and Testing .
  Is the fuel system operation normal?
  
  Yes
  - Go to step 5
  No
  - Repair the fuel system as needed.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
(Z43) O2 1/1 NEGATIVE CURRENT CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 1: Measuring Resistance Of O2 Sensor Negative Current Control Circuit
Courtesy of CHRYSLER LLC
1. Ignition off.
2. Disconnect the ECM C1 harness connector.
3. Disconnect the O2 Sensor harness connector.
4. Measure the resistance of the (Z43) O2 1/1 Negative Current Control circuit between the Oxygen Sensor harness connector and the Engine Control Module (ECM) harness connector.
  Is the resistance below 10.0 Ohms?
  
  Yes
  - Go to step 6
  No
  - Repair the circuit for an open circuit or high resistance.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
OXYGEN SENSOR
1. Replace the Oxygen Sensor in accordance with the Service Information.
2. Reconnect the ECM C1 harness connector.
3. Reconnect the O2 Sensor harness connector.
4. Start the engine.
5. Allow the engine to reach normal operating temperature. It may be necessary to test drive the vehicle to confirm repair.
6. Monitor the scan tool for at least two minutes.
7. With the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  Yes
  - Go to step 7
  No
  - Test Complete.
  - Perform the ECM Verification Test. See DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
ENGINE CONTROL MODULE (ECM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors the Oxygen Sensor and the Engine Control Module (ECM).
- Look for any chafed, pierced, pinched, or partially broken wires.
- Look for broken, bent, pushed out or corroded terminals.
- Monitor the scan tool data relative to this circuit and wiggle test the wiring and connectors.
- Look for the data to change or for the DTC to reset during the wiggle test.
- Perform any Technical Service Bulletins that may apply.