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Home >> Jeep >> 2021 >> Grand Cherokee L Laredo, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 14 (5.7L - DTCS B1F08 To P0131) >> DTC Troubleshooting >> P000B-Bank 1 Camshaft 2 Position Slow Response >> Diagnostic Test

Diagnostic Test

WARNING: This page is about a different variant/trim than selected.
  1. READ AND RECORD DTCS AND ENVIRONMENTAL DATA - ERASE DTCS AND CHECK FOR THE DTC TO RETURN 
    1. With the scan tool, read DTCs in all Electronic Control Units (ECUs) and record on the repair order.
    2. For future reference, with the scan tool, run and save a vehicle Scan Report and all related recorded data.
    3. With the scan tool, erase all DTCs.
    4. Turn the ignition off for a minimum of 10.0 seconds.
    5. Turn the ignition on.
    6. Using the When Monitored and Set Conditions above and recorded data, operate the vehicle in the conditions that set the DTC.
    7. With the scan tool, read DTCs.

    Did the DTC return?

    Yes 

    • Go To  2

    No 

  2. CHECK FOR OTHER DTCS 
    1. Refer to the recorded DTCs.

      Are there any system voltage, Camshaft Position Actuator, EOP Sensor or EOT Sensor DTCs present?

      Yes 

      No 

      • Go To  3
  3. ENGINE OIL/ENGINE MECHANICAL 
    1. The following items should be checked before continuing with this procedure. Failure to do so may lead to misdiagnosis.
      • LOW ENGINE OIL LEVEL
      • INCORRECT ENGINE OIL FILTER (DOES NOT MEET OEM SPECIFICATIONS)
      • DETERIORATED OR DIRTY OIL
      • CONTAMINATED ENGINE OIL
      • INCORRECT ENGINE OIL VISCOSITY
      • AERATED ENGINE OIL
      NOTE:

      If the engine oil is contaminated, inspect the Camshaft Position Solenoid for contamination, foreign material or any condition that would restrict movement of the valve. The solenoid must be replaced if damaged or if valve movement is restricted due to contamination.

      Were any of the above conditions present?

      Yes 

      No 

      • Go To  4
  4. CHECK THE ENGINE OIL PRESSURE AND ENGINE MECHANICAL CONDITION 
    1. Install an oil pressure gauge and check the engine oil pressure in accordance with the Service Information. Refer to CHECKING ENGINE OIL PRESSURE .
      NOTE:

      With the scan tool, compare the engine oil pressure reading on the gauge with the scan tool reading at different engine speeds. If the pressure reading on the scan tool is not close to what the gauge displays, perform the diagnostic procedure for P0521-ENGINE OIL PRESSURE SENSOR PERFORMANCE.

    2. Check the engine mechanical condition (i.e. proper oil drain back, oil sludge, etc.)

      Is the engine oil pressure within specifications?

      Yes 

      • Check the engine for a mechanical condition (i.e. proper oil drain back, oil sludge, etc.). If no issues found, replace the Oil Pump Assembly.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  5
  5. VARIABLE CAM TIMING (VCT) SOLENOID CONTROL ACTUATION 
    1. Turn the ignition on.
      NOTE:

      The VCT Solenoid actuates whenever the ignition key is turned on for cleaning purposes. This actuation also take place when the engine stops. So if you are testing the solenoid with a test light it is possible that you will see the solenoid actuate at key on and engine stop.

    2. With the scan tool, actuate the VCT Solenoid control to toggle on and off.
    3. Listen for the VCT Solenoid to click open and closed during the actuation.

      Does the Variable Cam Timing Solenoid click open and closed during the actuation?

      Yes 

      • Go To  6

      No 

      • Go To  8
  6. CHECK THE VARIABLE CAMSHAFT TIMING (VCT) SOLENOID FOR CONTAMINATION, SLUDGE OR DEBRIS 
    1. Turn the ignition off.
    2. Remove the VCT Solenoid in accordance with the Service information. Refer to SOLENOID, VARIABLE VALVE TIMING (VVTS), REMOVAL AND INSTALLATION, 5.7L .
    3. Inspect the VCT Solenoid for contamination, sludge, foreign debris, or any condition that would restrict operation of the VCT Solenoid.
    4. Inspect the oil passages for signs of sludge or foreign material.

      Were any problems found with the VCT Solenoid?

      Yes 

      • Replace the VCT Solenoid in accordance with the Service Information. The "Cam/Crank Relearn" Procedure  must be performed every time there has been a repair/replacement made to a CMP Sensor and/or CKP Sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Cam/Crank Relearn" Procedure.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  7
  7. CHECK FOR HIGH FRICTION IN THE VALVETRAIN COMPONENTS 
    1. Remove the Camshaft Phaser in accordance with the Service Information. Refer to CHAIN AND SPROCKETS, TIMING, REMOVAL AND INSTALLATION, 5.7L .
    2. Rotate the Camshaft and check for an increase in the torque to rotate the Camshaft.

      Is there and issue with the Camshaft or any other valvetrain components causing a increased friction?

      Yes 

      • Replace the Camshaft, bearings, or valvetrain components that are causing the issue.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Replace the Camshaft Phaser in accordance with the Service Information. The "Cam/Crank Relearn" Procedure  must be performed every time there has been a repair/replacement made to a CMP Sensor and/or CKP Sensor, flywheel, valvetrain, timing chain or gears. Failure to do so can cause a misfire fault to set. With the scan tool, perform the "Cam/Crank Relearn" Procedure.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  8. ISOLATE AND CHECK THE VCT SOLENOID (K442) CONTROL CIRCUIT FOR A SHORT TO GROUND 
    1. The ignition must be off when checking a circuit for continuity to ground.
    2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and every component harness connector containing the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
    3. Connect the negative lead of the DVOM to a known good ground.
    4. With the positive lead of the DVOM, probe the circuit being tested at the component harness connector and check for continuity between the circuit and ground.
    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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    1. If it is necessary to probe a terminal at a PCM harness connector, connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
      NOTE:

      There should be no continuity between ground and the circuit being tested.

      Is there continuity between ground and the circuit being tested?

      Yes 

      • Repair the circuit for a short to ground. Use the wiring diagram as a guide to trace the circuit and look for any in-line connectors to help isolate the location of the short.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .

      No 

      • Go To  9
  9. ISOLATE AND CHECK THE VCT SOLENOID (K442) CONTROL CIRCUIT FOR AN OPEN/HIGH RESISTANCE 
    1. The ignition must be off when checking the continuity of a circuit.
    2. Isolate the circuit by disconnecting the Electronic Control Unit (ECU) and the component harness connector containing the circuit being tested. Note:  Use the wiring diagram as a guide to follow the path of the circuit.
    3. Before measuring the resistance of any circuit, first measure the resistance between the two leads of the DVOM. Note:  The meter leads can add resistance to the measurement value.
    4. Connect one lead of the DVOM to the circuit being tested at the component harness connector.
    5. Connect the other lead to the circuit being tested at the GPEC Adaptor and measure the resistance of the circuit.
    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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    NOTE:

    IMPORTANT - The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.

    1. If it is necessary to probe a terminal at a PCM harness connector, connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.

      Is the resistance below 3.0 Ohms?

      Yes 

      • Go To  10

      No 

  10. CHECK THE (Z903) GROUND CIRCUIT FOR HIGH RESISTANCE BY LOAD TESTING THE CIRCUIT 
    1. Disconnect the component harness connector to isolate the ground circuit.
    2. Connect the positive lead of the load test tool to the positive side of the Battery.
    3. Connect the negative lead of the load test tool to the ground circuit at the component harness connector (A). Note:  refer to the diagram below.
    4. The bulb on the load test tool should be illuminated and bright if there is no resistance in the circuitry.
    NOTE:

    Why perform a Voltage Drop Test? A load test is used to determine if a circuit is capable of carrying the amperage needed to perform properly. The 3156 bulb in the load tool illustrated, is a simple but effective method of testing circuit functionality. A 3156 Bulb has approximately 6.0 Ohms of resistance when the bulb is powered  and draws approximately 2.0 amps of current. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT LOAD TESTING PROCEDURES .

    NOTE:

    A 12-volt test light can be substituted for the load test tool, but only  if the test light draws enough current to effectively load test the circuit. Many high impedance test lights draw very little amperage (less than 0.1 amps) and are not reliable to load test a circuit. To perform a proper load test of a circuit, the tool being used should draw more than approximately 0.75 amps.

    NOTE:

    Why perform a Voltage Drop Test? To verify with certainty there is not any resistance in the circuit being tested, perform a simple voltage drop test across the 3156 bulb of the load test tool. To do so perform the following:

    1. Connect the leads of a DVOM to the alligator clips on the load test tool while the load test tool is connected in series with the circuit.
    2. Compare the voltage drop across the bulb to the voltage reading across the Battery terminals.
    3. The voltage dropped across the bulb should be equal to the voltage reading across the Battery terminals if there is no resistance in the circuit being tested.

    Example:  2.0 Ohms of resistance in the circuit being tested will cause the voltage measurement across the bulb to be 25% less than when compared to Battery voltage. The reason for this is that the 2.0 Ohms in the circuit makes up 25% of the total circuit resistance of 8.0 Ohms. Read the CIRCUIT LOAD TESTING PROCEDURE for information on building a simple load test tool and for additional load testing information and alternative methods of load testing or voltage drop testing a circuit. Refer to CIRCUIT LOAD TESTING PROCEDURES .

    GC0174957Courtesy of CHRYSLER GROUP, LLC
    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 the GPEC Diagnostic Adaptor to perform the diagnosis.

    1. If it is necessary to probe a terminal at a PCM harness connector, connect the (special tool #10436, Adapter, GPEC Diagnostic) to the appropriate PCM harness connector.
      NOTE:

      IMPORTANT - The GPEC Diagnostic Adaptor can add up to 1.5 Ohms of resistance to the circuit.

      NOTE:

      Compare the brightness of the bulb in the load test tool to that of a direct connection to Battery.

      Is the load test bulb illuminated and bright?

      Yes 

      • Go To  11

      No 

      • Repair the ground circuit for an open or high resistance.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  11. ACTUATE AND CHECK THE OPERATION OF THE VARIABLE CAM TIMING (VCT) SOLENOID DRIVER 
    1. Turn the ignition off.
    2. Inspect the wiring and connectors between the VCT Solenoid and the Powertrain Control Module (PCM).
    3. Look for any chafed, pierced, pinched or partially broken wires.
    4. Look for broken, bent, pushed out or corroded terminals.
    5. Verify that there is good pin to terminal contact in the VCT Solenoid and Powertrain Control Module connectors.
    6. Reconnect the PCM harness connector.
    7. Turn the ignition on.
    8. Using a 12-volt test light connected to ground, probe the VCT Solenoid (K442) Control circuit in the VCT Solenoid harness connector.
      NOTE:

      The PCM will command the solenoid ON briefly after the ignition is turned on. This is a normal condition. The test light will illuminate briefly and then turn off and stay off if there is not a short to voltage.

    9. With the scan tool, actuate the VCT Solenoid Control to the highest duty cycle position.
      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 

      No 

      • Go To  12
  12. CHECK RELATED PCM AND COMPONENT CONNECTIONS 
    1. Perform any Service Bulletins that apply.
    2. Disconnect all PCM harness connectors.
    3. Disconnect all related in-line harness connections (if equipped).
    4. Disconnect the related component harness connectors.
    5. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
      • Proper connector installation.
      • Damaged connector locks.
      • Corrosion.
      • Other signs of water intrusion.
      • Weather seal damage (if equipped).
      • Bent terminals.
      • Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
      • Terminals that have been pushed back into the connector cavity.
      • Check for spread terminals and verify proper terminal tension.

      Repair any conditions that are found.

    6. Reconnect all PCM harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
    7. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
    8. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
    9. With the scan tool, erase DTCs.
    10. Test drive or operate the vehicle in accordance with the when monitored and set conditions.
    11. With the scan tool, read DTCs.

      Did the DTC return?

      Yes 

      No 

      • The wiring or poor connection problem has been repaired.
      • Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
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