Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSJEEP2009COMPASS LIMITED, EDG, AUTOMATIC CVTREPAIR AND DIAGNOSISENGINE PERFORMANCESYSTEMDTCS P0122 TO P0222 (GAS)P0137-O2 SENSOR 1/2 CIRCUIT LOWDIAGNOSTIC TEST

2009 Jeep Compass Limited, EDG, Automatic CVT

Diagnostic Test

2009 Jeep Compass Limited, EDG, Automatic CVTSECTION Diagnostic Test

OXYGEN SENSOR 1/2 VOLTAGE
1. Start the engine and allow it to reach normal operating temperature.
  WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts or fan. Do not wear loose clothing. Failure to follow these instructions may result in possible serious or fatal injury.
2. With a scan tool, monitor the 1/2 O2 Sensor Volts.
  Is the voltage less than 2.52 volts?
  
  Yes
  - Go to step 2
  No
  - Refer to the CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K141) O2 1/2 SIGNAL CIRCUIT VOLTAGE
1. Turn the ignition off.
2. Disconnect the Oxygen Sensor 1/2 harness connector.
3. Turn the ignition on.
4. With a scan tool, monitor the 1/2 O2 Sensor Volts.
  Is the voltage above 4.8 volts?
  
  Yes
  - Go to step 3
  No
  - Go to step 5
OXYGEN SENSOR 1/2

Fig 1: Checking O2 Sensor Circuit
Courtesy of CHRYSLER LLC
1. Measure the voltage on the (K904) O2 1/2 Return circuit in the Oxygen Sensor 1/2 harness connector.
  Is the voltage between 2.475 and 2.525 volts?
  
  Yes
  - Replace the Oxygen Sensor 1/2.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 4
(K904) O2 1/2 RETURN CIRCUIT SHORTED TO GROUND

Fig 2: Checking O2 Sensor Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) harness connector.
3. Measure the resistance between ground and the (K904) O2 1/2 Return circuit in the Oxygen Sensor 1/2 harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the (K904) O2 1/2 Return circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 8
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO GROUND

Fig 3: Checking O2 Sensor Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between ground and the (K141) O2 1/2 Signal circuit in the Oxygen Sensor 1/2 harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the (K141) O2 1/2 Signal circuit for a short to ground.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 6
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO THE (K904) O2 1/2 RETURN CIRCUIT

Fig 4: Checking O2 Sensor Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K141) O2 1/2 Signal circuit and the (K904) O2 1/2 Return circuit in the Oxygen Sensor 1/2 harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short between the (K904) O2 1/2 Return circuit and the (K141) O2 1/2 Signal circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 7
(K141) O2 1/2 SIGNAL CIRCUIT SHORTED TO THE (K299) O2 1/2 HEATER CONTROL CIRCUIT

Fig 5: Checking O2 Sensor Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance between the (K141) O2 1/2 Signal circuit and the (K299) O2 1/2 Heater Control circuit in the Oxygen Sensor 1/2 harness connector.
  Is the resistance below 100 ohms?
  
  Yes
  - Repair the short between the (K299) O2 1/2 Heater Control circuit and the (K141) O2 1/2 Signal circuit.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 8
POWERTRAIN CONTROL MODULE (PCM)
1. Using the wiring diagram/schematic as a guide, inspect the wiring and connectors between the Oxygen Sensor 1/2 and the Powertrain Control Module (PCM).
2. Look for any chafed, pierced, pinched or partially broken wires.
3. Look for broken, bent, pushed out or corroded terminals.
4. Refer to any Technical Service Bulletins (TSBs) that may apply.
  Were any problems found?
  
  Yes
  - Repair as necessary.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.