LEMON Manuals: Even more car manuals for everyone
Home >> Jeep >> 2005 >> Wrangler Unlimited >> Repair and Diagnosis >> Engine Performance >> System >> Powertrain Diagnostic Procedures >> Diagnostic Information And Procedures >> DRIVEABILITY - NGC - Diagnostic Tests >> U0101-No Bus Message From Trans Control Module >> Diagnostic Procedure

Diagnostic Procedure

DIAGNOSTIC PROCEDURE - NO BUS MESSAGE FROM TRANS CONTROL MODULE

TEST ACTION APPLICABILITY
1 Ignition on, engine not running.
With the DRBIII®, erase DTCs.
Cycle the ignition key on and off several times. Leaving the ignition on for at least 20 seconds.
With the DRBIII®, read DTCs.
Does the DTC reset?
Yes --> Go To 2
No --> Refer to the INTERMITTENT CONDITION SYMPTOM  (Diagnostic Procedure).
Perform POWERTRAIN VERIFICATION TEST VER - 1 .		 All
2 Turn the ignition off.
Disconnect the PCM harness connectors.
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 MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS.

With a 12-volt test light connected to ground and with special tool #8815 installed, probe the (F11) Fused Ignition Switch Output circuit.
Perform the above check with the Ignition key in the off lock position, Ignition on, engine not running position, and during cranking.
Wiggle the related wire harness while probing the special tool with the test light to try to interrupt the circuit.
Does the test light illuminate brightly?
Yes --> Go To 3
No --> Repair the open or excessive resistance in the (F11) Fused Ignition Switch (Off, Run, Start) circuit. Inspect the related fuse, if the fuse is open check the circuit for a short to ground.
Perform POWERTRAIN VERIFICATION TEST VER - 1 .		 All
3
NOTE: Determine which modules this vehicle is equipped with before beginning.
NOTE: When attempting to communicate with any of the modules on this vehicle, the DRBIII® will display 1 of 2 different communication errors: a NO RESPONSE message or a BUS +/- SIGNALS OPEN MESSAGE.
Ignition on, engine not running.Use the DRBIII®, attempt to communicate with the remaining control modules.Was the DRBIII® able to communicate with one or more of the Modules?Yes --> Replace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 1 .No --> Refer to the COMMUNICATION CATEGORY  and perform the PCI BUS COMMUNICATION FAILURE SYMPTOM .Perform POWERTRAIN VERIFICATION TEST VER - 1 .		 All
scientia non olet · About LEMON Manuals