Circuit/System Testing
WARNING: This page is about a different car, the 2009 GMC Sierra, 2009 GMC Cab & Chassis Sierra, 2009 Chevrolet Silverado, and 2009 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.
- Inspect the transmission fluid level. Refer to Transmission Fluid Check .
- Ignition OFF, disconnect the X175 harness connector at the transmission.
- Ignition ON, engine OFF, connect a 3A fused jumper wire to the PS1 signal circuit terminal D to ground, PS2 signal circuit terminal F to ground, and PS3 signal circuit terminal E to ground. Verify with a scan tool the TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameters changes from High to Low when the signal circuit is grounded.
- If not the specified value, test the affected pressure switch signal circuit for an open/high resistance. If circuits tests normal, replace the TCM.
- Ignition OFF, connect the X175 harness connector to the transmission.
- Remove the pressure switch module from the valve body. Leave the internal wire harness connected to the pressure switch manifold. Refer to Pressure Switch Manifold Replacement .
- Connect a jumper wire to the base of the pressure switch module and ground.
- Ignition ON, engine OFF, gently push on the PS1, PS2, and PS3 switches. Verify with a scan tool that TFP Switch 1, TFP Switch 2, and TFP Switch 3 parameters changed from High to Low.
- If not the specified value, test the internal wire harness circuits for an open/high resistance. If the circuits test normal, replace the pressure switch module.
- If all circuits test normal, refer to Control Valve Body Assembly Disassemble
and Control Valve Body Cleaning and Inspection
.
- If valve body inspection is normal, replace the shift solenoid indicated by the DTC, refer to Control Valve Solenoid Replacement (SS1, SS2, SS3, TCC, and MAIN MOD) or Control Valve Solenoid Replacement (PCS1 and PCS2) .