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 DIAGNOSISBRAKESTRACTION CONTROLANTI-LOCK BRAKE SYSTEMDIAGNOSTIC TESTSNOTES
1999 GMC Forward Control 5.7 R, Automatic
Diagnostic Tests: Notes
1999 GMC Forward Control 5.7 R, AutomaticSECTION Notes
NOTE:
To identify the circuits and wire colors referenced in testing, see WIRING DIAGRAMS . After repairs, recheck system operation to verify problem has been repaired. See DIAGNOSTIC SYSTEM CHECK under DIAGNOSIS & TESTING.
WSS TEMPERATURE-VS-SENSOR RESISTANCE
| Temperature °F (°C) | Ohms | ||
|---|---|---|---|
| "C", "G" & "P" Series | |||
| -40 To 40 (-40 To 4) | 1575-2420 | ||
| 41-110 (5-43) | 1980-2800 | ||
| 111-200 (44-93) | 2250-3280 | ||
| 201-302 (94-150) | 2750-3850 | ||
| "K" & "L" Series | |||
| -40 To 40 (-40 To 4) | 702-1060 | ||
| 41-110 (5-43) | 855-1230 | ||
| 111-200 (44-93) | 1000-1440 | ||
| 201-302 (94-150) | 1170-1661 | ||
| "M" Series | |||
| -40 To 40 (-40 To 4) | 3915-5820 | ||
| 41-110 (5-43) | 4760-6800 | ||
| 111-200 (44-93) | 5560-8040 | ||
| 201-302 (94-150) | 6600-9416 | ||
| "S" & "T" Series | |||
| AWD | |||
| -40 To 40 (-40 To 4) | 089-1630 | ||
| 41-110 (5-43) | 1337-1900 | ||
| 111-200 (44-93) | 1560-2230 | ||
| 201-302 (94-150) | 1850-2651 | ||
| 2WD & 4WD | |||
| -40 To 40 (-40 To 4) | 920-1440 | ||
| 41-110 (5-43) | 1125-1700 | ||
| 111-200 (44-93) | 1305-2000 | ||
| 201-302 (94-150) | 1530-2310 | ||
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.