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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 - Diagnostic Tests >> P1698-No Bus Message From TCM (Gas - Except NGC) >> Diagnostic Procedure

Diagnostic Procedure

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.

    Ignition on, engine not running.

    With the DRBIII®, read DTCs.

    Is the Good Trip Counter displayed and equal to zero?

    1. Yes --> Go To 2
    2. No --> Refer to the SYMPTOM: INTERMITTENT CONDITION  Symptom (Diagnostic Procedure).

      Perform POWERTRAIN VERIFICATION TEST VER - 1 .

      NOTE: This DTC could have been set when the TCM was disconnected for transmission Diagnostics.
  2. Ignition on, engine not running.

    Connect the DRBIII® and access Powertrain Control Module.

    NOTE: This test checks for other PCI BUS codes. That indicates diferent circuits in the BUS.

    With the DRBIII®, read DTCs.

    Is a DTC also set for NO SKIM BUS MESSAGE and/or No MIC BUS MESSAGE?

    1. Yes --> Go To 3
    2. No --> Inspect the TCM Fused Ignition Switch circuits and ground circuits.

      Perform POWERTRAIN VERIFICATION TEST VER - 1 .

  3. With the DRBIII®, read DTCs. This is to ensure power and grounds to the PCM are operational.
    NOTE: If the DRBIII® will not read PCM DTCs, follow the "NO RESPONSE TO PCM (SCI only)" symptom path, if vehicle will start. For NO START Conditions follow symptom "NO RESPONSE" in Starting category.

    Turn the ignition off.

    Disconnect the PCM harness connectors.

    Connect the DRBIII® to the Data Link connector

    Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and black test probes.

    Connect the scope input cable to the channel one connector on the DRBIII®. Attach the red and black leads and the cable to probe adapter to the scope input cable.

    Select DRBIII® Standalone.

    Select lab scope.

    Select Live.

    Select 12 volt square wave.

    Press F2 for Scope.

    Press F2 and use the down arrow to set voltage range to 20 volts. Press F2 again when complete.

    Connect the Black lead to the PCM ground. Connect the Red lead to the PCM PCI Bus circuit

    Ignition on, engine not running.

    Observe the voltage displayed on the DRBIII® Lab Scope.

    What is the voltage displayed on the scope?

    1. Pulse from 0 to approximately 7.5 volts
      1. Test Complete.
    2. Steady 0 volts
      1. Repair the open PCI Bus circuit to PCM.
      2. Perform POWERTRAIN VERIFICATION TEST VER - 1 .
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