Pinpoint Test
NOTE:
If the scan tool is unable to communicate with the PCM or access the transmission PIDs
, REFER to
INTRODUCTION - GASOLINE MODELS
.
- Read and record all DTCs
- Install the scan tool and record all DTCs .
Is DTC P1780 set?
- Yes: GO to 2 .
- No: REFER to SYMPTOM CHART: INSTRUMENT CLUSTER AND PANEL ILLUMINATION .
- Check the BCM fuse
- Ignition OFF.
- Remove the BCM fuse 41 (7.5A).
- Check fuse 41 (7.5A).
Is the resistance less than 5 ohms?
- Yes: REINSTALL the fuse. GO to 6 .
- No: GO to 3 .
- Check the BCM for an internal short
- Disconnect the BCM C2280B.
- Inspect for damaged or pushed out terminals.
- Install a new fuse.
Did the fuse fail?
- Yes: REPLACE the BCM. REFER to BODY CONTROL MODULE (BCM) - WITH INTELLIGENT ACCESS (IA) Or BODY CONTROL MODULE (BCM) - WITHOUT INTELLIGENT ACCESS (IA) . TEST the system for normal operation.
- No: GO to 4 .
- Check the TCS power circuit for a short to ground
- Disconnect selector lever C2008.
- Measure the resistance of circuit CBP41 (BU) from selector lever C2008-6 to ground.
Selector Lever Ground C2008 Ground Pin Circuit Measurement / Action Pin Circuit 6 CBP41 (BU) Ground Ground
Is the resistance greater than 10, 000 ohms?
- Yes: GO to 5 .
- No: REPAIR circuit CBP41 (BU) for a short to ground. CLEAR the DTC. TEST the system for normal operation.
- Check the TCS signal input circuit for a short to ground
- Disconnect the PCM C175T.
- Measure the resistance of circuit CET34 (BN/GN) between selector lever harness C2008-5 and ground.
Selector Lever Ground C2008 Ground Pin Circuit Measurement / Action Pin Circuit 5 CET34 (BN/GN) Ground Ground
Is the resistance greater than 10, 000 ohms?
- Yes: GO to 8 .
- No: REPAIR circuit CET34 (BN/GN) for a short to ground. CLEAR the DTC. TEST the system for normal operation.
- Check the TCS power circuit for an open
- Disconnect the selector lever C2008.
- Disconnect the BCM C2280B.
- Measure the resistance of circuit CBP41 (BU) from selector lever C2008-6 to the BCM C2280B-3.
Selector Lever BCM C2008 C2280B Pin Circuit Measurement / Action Pin Circuit 6 CBP41 (BU) 3 CBP41 (BU)
Is the resistance less than 5 ohms?
- Yes: GO to 7 .
- No: REPAIR circuit CBP41 (BU) for an open. CLEAR the DTC. TEST the system for normal operation.
- Check the TCS signal input circuit for an open
- Disconnect the PCM C175T.
- Measure the resistance of circuit CET34 (BN/GN) between selector lever C2008-5 to the PCM C175T-31.
Selector Lever PCM C2008 C175T Pin Circuit Measurement / Action Pin Circuit 5 CET34 (BN/GN) 31 CET34 (BN/GN)
Is the resistance less than 5 ohms?
- Yes: GO to 8 .
- No: REPAIR circuit CET34 (BN/GN) for an open. CLEAR the DTC. TEST the system for normal operation.
- Check the TCS
- Measure the resistance between selector lever C2008-5 and C2008-6 while cycling the TCS.
Selector Lever Selector Lever C2008 C2008 Pin Circuit Measurement / Action Pin Circuit 5 - 6 -
Is the resistance less than 5 ohms with the switch pressed and greater than 10, 000 ohms when released?
- Yes: GO to 9 .
- No: INSTALL a new selector lever knob. REFER to Selector Lever Knob . CLEAR the DTC. TEST the system for normal operation.
- Measure the resistance between selector lever C2008-5 and C2008-6 while cycling the TCS.
- Check the PCM
- Connect the BCM C2280B.
- Connect the selector lever C2008.
- Ignition ON.
- Measure the voltage on circuit CET34 (BN/GN) at the PCM C175T-31 to ground while cycling the TCS.
PCM Ground C175T Ground Pin Circuit Measurement / Action Pin Circuit 31 CET34 (BN/GN) Ground Ground
Is the voltage greater than 10 volts with the switch pressed, and less than 5 volts with the switch released?
- Yes: REPLACE the PCM. PROGRAM the PCM with the latest calibration level. PERFORM the Solenoid Body Strategy Data Download procedure. REFER to SOLENOID BODY STRATEGY DOWNLOAD . TEST the system for normal operation.
- No: REPAIR circuit CET34 (BN/GN) for an open. CLEAR the DTC. TEST the system for normal operation.