Diagnostic Routine B

Diagnostic Routine B

Diagnostic Overview

SelectShift (TM)

Refer to Wiring Diagram Set 29 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

DTC Fault Trigger Conditions






Pinpoint Test

NOTE: If the scan tool is unable to communicate with the PCM (Powertrain Control Module) or access the transmission PIDs (Parameter Identifications), REFER to Computers and Control Systems Information.

1. Read and record all DTCs (Diagnostic Trouble Codes)

1. Install the scan tool and record all DTCs (Diagnostic Trouble Codes).

Is DTC (Diagnostic Trouble Code) P0815 set?






2. Check the upshift signal circuit for voltage

1. Ignition OFF.

2. Disconnect the selector lever C2008.

3. Inspect for damaged or pushed out terminals.

4. Ignition ON.

5. Measure the voltage on circuit CET43 (GY) from the selector lever C2008-9 to ground.





Is the voltage greater than 10 volts?






3. Check the upshift signal circuit for an open

1. Ignition OFF.

2. Disconnect the PCM (Powertrain Control Module) C175B.

3. Inspect for damaged or pushed out terminals.

4. Measure the resistance of circuit CET43 (GY) from selector lever C2008-9 to the PCM (Powertrain Control Module) C175B-23.





Is the resistance less than 5 ohms?






4. Check the upshift signal circuit for a short to ground

1. Measure the resistance of circuit CET43 (GY) from selector lever C2008-9 to ground.





Is the resistance greater than 10,000 ohms?






5. Check the signal return circuit for an open

1. Connect the PCM (Powertrain Control Module) C175B.

2. Ignition ON.

3. Measure the voltage from circuit CET43 (GY) from selector lever C2008-9 and circuit RE407 (YE/VT) selector lever C2008-8.





Is the voltage greater than 10 volts?






6. Check the downshift signal circuit for voltage

1. Ignition OFF.

2. Disconnect the selector lever C2008.

3. Inspect for damaged or pushed out terminals.

4. Ignition ON.

5. Measure the voltage on circuit CET42 (GN/VT) from selector lever C2008-10 to ground.





Is the voltage greater than 10 volts?






7. Check the downshift signal circuit for an open

1. Ignition OFF.

2. Disconnect the PCM (Powertrain Control Module) C175B.

3. Inspect for damaged or pushed out terminals.

4. Measure the resistance of circuit CET42 (GN/VT) from selector lever C2008-10 to the PCM (Powertrain Control Module) C175B-24.





Is the resistance less than 5 ohms?






8. Check the downshift signal circuit for a short to ground

1. Measure the resistance of circuit CET42 (GN/VT) from selector lever C2008-10 to ground.





Is the resistance greater than 10,000 ohms?






9. Check the signal return circuit for an open

1. Connect PCM (Powertrain Control Module) C175B.

2. Ignition ON.

3. Measure the voltage from circuit CET42 (GN/VT) from selector lever C2008-10 and circuit RE407 (YE/VT) selector lever C2008-8.





Is the voltage greater than 10 volts?