Diagnostic Aids
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2003 GMC Yukon XL, 2003 GMC Yukon, 2003 Chevrolet Tahoe, 2003 Chevrolet Suburban, and 2003 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.
- Refer to the Transmission Fluid Pressure (TFP) Manual Valve Position Switch Logic, SeeTransmission Fluid Pressure (TFP) Manual Valve Position Switch Logic Specification table for the normal range signals and the invalid combinations. On the table, LOW is 0 volts, HI is ignition voltage.
- Sediment in the valve body may cause improper operation of the TFP manual valve position switch. If sediment intrusion is suspected, clean the valve body and replace the TFP manual valve position switch.