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Home >> Jeep >> 2005 >> Wrangler X, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 627 (Powertrain Diagnostic Procedures - DRIVEABILITY - Gas - Symptom & Diagnostic Tests (DTCS P0031 To P1899)) >> DRIVEABILITY - Gas - Symptoms >> Symptom: *CHECKING CHARGING SYSTEM OPERATION WITH NO DTCS (GAS - EXCEPT NGC) >> Diagnostics Procedures

Diagnostics Procedures

WARNING: This page is about a different car, the 2004 Dodge Pickup and 2004 Dodge Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
NOTE: Refer to VERIFICATION TESTS for appropriate verification test procedures.
  1. Check for any related TSBs.
    NOTE: Verify that the Battery is able to pass a load test before continuing.

    Ignition on, engine not running.

    With the DRBIII®, read the Battery voltage and record the results.

    Measure Battery voltage between the Battery Positive and Negative Terminals and record the results.

    Compare the two voltage readings.

    Is the voltage difference less than one volt?

    1. Yes --> Go To 2
    2. No --> Go To 8
  2. Measure the voltage between the Generator B+ Terminal and the Battery + Post ignition on, engine not running.
    CAUTION: Ensure all wires are clear of the engine's moving parts.

    Start the engine.

    Is the voltage above 0.4 of a volt?

    1. Yes --> Repair the excessive resistance in the Battery Positive circuit between the Generator and Battery.

      Perform POWERTRAIN VERIFICATION TEST VER - 3 .

    2. No --> Go To 3
  3. Ignition on, engine not running.

    Record all DTCs and freeze frame data, now erase Codes.

    Carefully inspect all connectors for corrosion or spread terminals before continuing.

    With the DRBIII® actuate the Generator Field Driver.

    Measure the voltage of the (K125) Generator Field Source circuit by backprobing the back of Generator Field harness connector.

    Is the voltage above 10.0 volts?

    1. Yes --> Go To 4
    2. No --> Repair the (K125) Generator Field Source circuit for an open or short to ground.

      Perform POWERTRAIN VERIFICATION TEST VER - 3 .

  4. Start the engine.

    Warm the engine to operating temperature.

    CAUTION: Ensure all wires are clear of the engine's moving parts.

    Measure the voltage between the Generator case and Battery Negative Post.

    Is the voltage above 0.1 of a volt?

    1. Yes --> Repair the excessive resistance in the Generator Ground circuit between the Generator Case and Battery Ground side.

      Perform POWERTRAIN VERIFICATION TEST VER - 3 .

    2. No --> Go To 5
  5. Turn the ignition off.

    Disconnect the Generator Field harness connector at back of the Generator.

    Measure resistance across the Generator Field Terminals at the Generator.

    Is the resistance above 15 ohms?

    1. Yes --> Replace or repair the Generator as necessary.

      Perform POWERTRAIN VERIFICATION TEST VER - 3 .

    2. No --> Go To 6
  6. Disconnect the PCM harness connectors.

    Measure the resistance of the (K20) Generator Field Driver circuit between the PCM harness connector and the Generator harness connector.

    Is the resistance below 5.0 ohms?

    1. Yes --> Go To 7
    2. No --> Repair the open in the (K20) Gen Field Control circuit.

      Perform POWERTRAIN VERIFICATION TEST VER - 3 .

    7. NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
  7. If there are no possible causes remaining, view repair.
    1. Repair
      1. Replace and program the Powertrain Control Module per Service Information.
      2. Perform POWERTRAIN VERIFICATION TEST VER - 3 .
  8. Turn the ignition off.
    NOTE: Battery condition must be verified prior to this test.

    Inspect the Generator Belt tension and condition.

    Is the Generator Belt OK?

    1. Yes --> Go To 9
    2. No --> Repair as necessary.

      Perform POWERTRAIN VERIFICATION TEST VER - 3 .

  9. Start the engine.

    Turn on all accessories.

    Raise engine speed to 2000 RPM for 30 seconds then return to idle.

    With the DRBIII®, read DTCs.

    Are there any "Charging System" Trouble Codes?

    1. Yes --> Refer to Symptom list for the related Charging DTCs .

      Perform POWERTRAIN VERIFICATION TEST VER - 3 .

    2. No --> Go To 10
  10. Ignition on, engine not running.

    With the DRBIII®, actuate the Generator Field Driver.

    Using a 12-volt test light, backprobe the Generator Field Driver Terminal at the back of the Generator.

    NOTE: The test light should blink On and Off every 1.4 seconds.

    While monitoring the 12-volt test light, wiggle the Field Terminals back to the PCM and ASD Relay.

    Was there any interruption in the normal cycle of the test light?

    1. Yes --> Repair the wire or connector where the wiggling interrupted the voltage cycle.

      Perform POWERTRAIN VERIFICATION TEST VER - 3 .

    2. No --> Test Complete.
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