Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSGMC1999FORWARD CONTROL 5.7 R, AUTOMATICREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 65 (AUTOMATIC TRANSAXLE SERVICING)REMOVAL & INSTALLATIONTFP MANUAL VALVE POSITION SWITCHREMOVAL
1999 GMC Forward Control 5.7 R, Automatic
TFP Manual Valve Position Switch: Removal
1999 GMC Forward Control 5.7 R, AutomaticSECTION Removal
WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.
- Remove the case side cover. See CASE SIDE COVER . Disconnect the transaxle wiring harness.
- Remove the control valve body bolts (375, 379, 381) that mount the fluid pressure manual valve position switch to the control valve body (300). See Fig 1 .
- Carefully remove the fluid pressure manual valve position switch (395). Inspect the fluid pressure manual valve position switch (395) for the following conditions:
- Damaged electrical connector terminals.
- Damaged seals.
- Damaged switch membranes.
- Debris on the switch membranes.
NOTE:
When removing the TFP switch handle the switch carefully, the fluid pressure manual valve position switch is very delicate.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.