Diagnostic Starting Point - Automatic Transmission Shift Lock Control
Begin the system diagnosis by reviewing the Automatic Transmission Shift Lock Control Description and Operation . Reviewing the Description and Operation information will help you determine the correct symptom diagnostic procedure when a malfunction exists. Reviewing the Description and Operation will also help you determine if the condition described by the customer is normal operation.
Refer to Symptoms - Automatic Transmission Shift Lock Control in order to identify the correct procedure for diagnosing the system and where the procedure is located.
Scan Tool Data List
The Shift lock Control Scan Tool Data List contains all shift lock control related parameters that are available on the scan tool. The list is arranged in alphabetical order. A given parameter may appear in any one of the data lists, and in some cases may appear more than once, or in more than one data list in order to group certain related parameters together.
Use the Shiftlock Control Scan Tool Data List only after the following is determined
- The Diagnostic System Check - Vehicle is completed.
- No diagnostic trouble codes (DTCs)
- On-board diagnostics are functioning properly.
Scan tool values from a properly functioning system may be used for comparison with the system you are diagnosing. The Shiftlock Control Scan Tool Data List represents values that would be seen on a normal functioning system engine.
| IMPORTANT | A scan tool that displays faulty data should not be used. The scan tool problem should be reported to the manufacturer. Use of a faulty scan tool can result in misdiagnosis and unnecessary parts replacement. |
Only the parameters listed below are referenced in this service information for use in diagnosis. If all values are within the typical range described below, refer to Symptoms - Automatic Transmission Shift Lock Control for diagnosis.
The column labeled Data List indicates where a parameter can be located on the scan tool. Refer to the scan tool operating manual for the exact locations of the data lists. The following is a description of each term listed
| Scan Tool Parameter | Data List | Parameter Range/Units | Typical Data Values |
|---|---|---|---|
| Engine Idling/Radiator Hose Hot/Closed Throttle/Park or Neutral/Closed Loop/Accessories Off | |||
| BPP Signal | Electrical/Theft, Cruise/Traction, Eng, TAC | Applied/Released/Invalid | Released |
| BPP Circuit Signal | Electrical/Theft, TAC | Applied/Released | Released |
| Current Gear | IPC | Transmission Gear Position | 1,2,3,4,5,6 |
| Ext Travel BPP Signal | TAC | Applied/Released/Invalid | Released |
| PNP Switch (If Equipped) | Electrical/Theft | Park, Reverse, Neutral, Drive, 4, 3, 2, 1 | Park |
| TCC/Cruise Brake Pedal Switch | MT, TAC | Applied/Released | Release |
| TR Sw | Eng | Transmission Gear Position | Varies |
Scan Tool Data List
Scan Tool Data Definitions
The Shift Lock Control Scan Tool Data Definitions contains a brief description of all engine related parameters available on the scan tool. The list is in alphabetical order. A given parameter may appear in any one of the data lists. In some cases, the parameter may appear more than once or in more than one data list in order to group certain related parameters together.
Symptoms - Automatic Transmission Shift Lock Control
| IMPORTANT | Review the system operation in order to familiarize yourself with the system functions. Refer to Automatic Transmission Shift Lock Control Description and Operation . |
Visual/Physical Inspection
- Inspect for aftermarket devices which could effect the operation of the automatic transmission shift lock control system, Refer to «Checking Aftermarket Accessories»(ref-201038-S27088131452005102400000) in Wiring Systems.
- Inspect the easily accessible to visible system components for obvious damage or conditions which could cause the symptom.
Symptom List
Refer to a diagnostic procedure from the following list in order to diagnose the symptom
- «Shift Lever Does Not Move with Brake Pedal Depressed»(ref-201086-S07147907092005102400000)
- «Shift Lever Can Be Moved without Brake Pedal Depressed»(ref-201086-S03348532542005102400000)