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 P000A TO P0121 (GAS)P0037-O2 SENSOR 1/2 HEATER CIRCUIT LOWDIAGNOSTIC TEST

2009 Jeep Compass Limited, EDG, Automatic CVT

Diagnostic Test

2009 Jeep Compass Limited, EDG, Automatic CVTSECTION Diagnostic Test

DTC IS ACTIVE
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 the scan tool, select View DTCs.
  Is the status Active for this DTC?
  
  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 .
(Z924/Z932) GROUND CIRCUIT OPEN OR HIGH RESISTANCE

Fig 1: Checking O2 Heater Control Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Oxygen Sensor 1/2 connector.
3. Turn the ignition on.
4. Using a 12 volt test light connected to 12 volts, check the (Z924/Z932) Ground circuit in the Oxygen Sensor 1/2 harness connector.
  NOTE: The test light should be illuminated and bright. Compare the brightness to that of a direct connection to the battery.
  
  Is the test light illuminated and bright?
  
  Yes
  - Go to step 3
  No
  - Repair the (Z924/Z932) Ground circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
(K299) O2 1/2 HEATER CONTROL CIRCUIT SHORTED TO GROUND

Fig 2: Checking O2 Heater Control Circuit
Courtesy of CHRYSLER LLC
1. Turn the ignition off.
2. Disconnect the Powertrain Control Module (PCM) connector.
3. Measure the resistance between ground 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 (K299) O2 1/2 Heater Control 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 4
(K299) O2 1/2 HEATER CONTROL CIRCUIT OPEN OR HIGH RESISTANCE

Fig 3: Checking O2 Heater Control Circuit
Courtesy of CHRYSLER LLC
1. Measure the resistance of the (K299) O2 1/2 Heater Control circuit between the Oxygen Sensor 1/2 harness connector and the Powertrain Control Module (PCM) harness connector.
  Is the resistance below 5.0 ohms?
  
  Yes
  - Go to step 5
  No
  - Repair the (K299) O2 1/2 Heater Control circuit for an open circuit or high resistance.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
OXYGEN SENSOR 1/2

Fig 4: Checking O2 Heater Control Circuit
Courtesy of CHRYSLER LLC
1. Connect the Powertrain Control Module (PCM) connector.
2. Turn the ignition on.
3. With the scan tool, actuate the Oxygen Sensor 1/2 control to the ON (100%) position.
4. Using a 12 volt test light connected to ground, check the (K299) O2 1/2 Heater Control circuit in the Oxygen Sensor 1/2 harness connector.
  NOTE: The test light should be illuminated and bright with the control actuated ON (100%). Compare the brightness to that of a direct connection to the battery.
5. With the scan tool, actuate the Oxygen Sensor 1/2 control to OFF (0%).
6. Using a 12 volt test light connected to ground, check the (K299) O2 1/2 Heater Control circuit in the Oxygen Sensor 1/2 harness connector.
  NOTE: The test light should not be illuminated with the control actuated OFF (0%).
  
  Is the test light illuminated and bright with the control actuated ON and not illuminated with the control actuated OFF?
  
  Yes
  - Replace the Oxygen Sensor 1/2 in accordance with the Service Information.
  - Perform the PCM VERIFICATION TEST. See DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure .
  No
  - Go to step 6
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.