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Home >> Chrysler >> 2006 >> PT Cruiser Base, 2D Convertible, Standard >> Repair and Diagnosis >> Engine Performance >> Testing & Diagnosis >> 2.4L Engine - DTCS P1854 To U11OC, Fuel Delivery System Check, Symptom Tests & Verification Tests >> Diagnosis And Testing >> P2097-Downstream Fuel Trim System 1 Lean >> Diagnostic Test

Diagnostic Test

  1. 1)  ACTIVE DTC 
    NOTE: Check the vehicle repair history. If the 1/2 O2 has been replace make sure that the O2 sensor was properly installed and meets OEM specification.
    NOTE: Check for contaminants that may have damaged the O2 Sensor: contaminated fuel, unapproved silicone, oil and coolant.

    Ignition on, engine not running.

    With a scan tool, read DTCs.

    Is the DTC active at this time? 

    Yes 

    1. Go To  2).

    No 

    1. Refer to the INTERMITTENT CONDITION diagnostic procedure.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to POWERTRAIN VERIFICATION TEST) .
  2. 2)  EXHAUST LEAK 

    Turn the ignition off.

    WARNING: To avoid personal injury from the exhaust system being hot, allow the exhaust to cool down to a safe temperature before performing a physical inspection. Failure to follow these instructions can result in personal injury or death.

    Visually and Physically inspect for holes, cracks and blockage in the exhaust system.

    Is the exhaust system is good condition? 

    Yes 

    1. Go To  3).

    No 

    1. Repair or Replace as necessary.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to POWERTRAIN VERIFICATION TEST) .
  3. 3)  ENGINE MECHANICAL PROBLEM 

    Check for any of the following conditions/mechanical problems.

    AIR INDUCTION SYSTEM - must be free from leaks

    ENGINE VACUUM - must be at least 13 inches in neutral

    ENGINE VALVE TIMING - must be within specifications

    ENGINE COMPRESSION - must be within specifications

    ENGINE EXHAUST SYSTEM - must be free of any restrictions or leaks

    ENGINE PCV SYSTEM - must flow freely

    TORQUE CONVERTER STALL SPEED - must be within specifications

    POWER BRAKE BOOSTER - no internal vacuum leaks

    FUEL - must be free of contamination

    FUEL INJECTOR - plugged or restricted injector; control wire not connected to correct injector

    Are there any engine mechanical problems? 

    Yes 

    1. Repair as necessary.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  4).
  4. 4)  O2 SENSOR 
    Fig 1: CHECKING O2 SENSOR OPERATION
    GC0041602Courtesy of DAIMLERCHRYSLER CORP.

    Ignition on, engine not running.

    Disconnect the 1/2 O2 Sensor harness connector.

    With the scan tool, monitor the 1/2 O2 Sensor voltage.

    The O2 Sensor voltage should read 5.0 volts on the scan tool with the connector disconnected.

    Using a jumper wire, jump the (K141) O2 Sensor 1/2 Signal circuit to the (K902) O2 Downstream Return circuit in the O2 Sensor harness connector.

    NOTE: The voltage should drop from 5.0 volts to 2.5 volts with the jumper wire in place.

    Did the O2 Sensor volts change from 5.0 volts to 2.5 volts? 

    Yes 

    1. Replace the O2 Sensor
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to POWERTRAIN VERIFICATION TEST) .

    No 

    1. Go To  5).
  5. 5)  (K141) O2 SENSOR 1/2 SIGNAL CIRCUIT 

    Remove the jump wire.

    Ignition on, engine not running.

    With the scan tool, monitor the 1/2 O2 Sensor voltage.

    Is the voltage above 4.8 volts? 

    Yes 

    1. Go To  6).

    No 

    1. Check the (K141) O2 Sensor 1/2 Signal circuit for an open or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module per Service Information. Refer to MODULE-POWERTRAIN CONTROL and STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to POWERTRAIN VERIFICATION TEST) .
  6. 6)  (K299) O2 SENSOR 1/2 HEATER CONTROL CIRCUIT 
    Fig 2: MEASURING RESISTANCE BETWEEN GROUND AND O2 SENSOR 1/2 HEATER CONTROL CIRCUIT
    GC0041532Courtesy of DAIMLERCHRYSLER CORP.

    Turn the ignition off.

    Measure the resistance between ground and the (K299) O2 Sensor 1/2 Heater Control circuit in the O2 Sensor harness connector.

    Is the resistance below 5.0 ohms? 

    Yes 

    1. Repair the short to ground in the (K299) O2 Sensor 1/2 Heater Control circuit.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to POWERTRAIN VERIFICATION TEST) 

    No 

    1. Go To  7).
  7. 7)  (K902) O2 DOWNSTREAM RETURN CIRCUIT 
    Fig 3: MEASURING FOR VOLTAGE ON THE O2 DOWNSTREAM RETURN CIRCUIT
    GC0041596Courtesy of DAIMLERCHRYSLER CORP.

    Measure the voltage on the (K902) O2 Downstream Return circuit in the O2 Sensor harness connector.

    Is the voltage at 2.5 volts? 

    Yes 

    1. Check the fuel system for contaminants.
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to POWERTRAIN VERIFICATION TEST) 

    No 

    1. Check the (K902) O2 Downstream Return circuit for a short to ground, open, or short to voltage. Inspect the O2 Sensor connector and the PCM harness connector. If OK, replace and program the Powertrain Control Module per Service Information. Refer to MODULE-POWERTRAIN CONTROL and STANDARD PROCEDURE - PCM/ECM/SKREEM PROGRAMMING .
    2. Perform the POWERTRAIN VERIFICATION TEST. (Refer to POWERTRAIN VERIFICATION TEST) 
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