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 7 (SUPPLEMENTAL INFLATABLE RESTRAINT SYSTEM)DIAGNOSTIC CHARTSDTC 36 - DISCRIMINATING SENSOR CIRCUIT OPEN OR SHORT TODTC WILL CLEAR
1999 GMC Forward Control 5.7 R, Automatic
DTC Will Clear
1999 GMC Forward Control 5.7 R, AutomaticSECTION DTC Will Clear
WARNING: This page does not describe the selected car, but rather 9 other vehicles, including the 1996 GMC Vandura Special, 1996 GMC Vandura, 1996 GMC Savana Special, 1996 GMC Savana Camper Special, and 1996 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
Current DTC: voltage at SENSOR FEED terminal No. 9 is more than 3.2 volts for 500 milliseconds. History DTC: scan tool clear codes command issued or 250 malfunction free ignition cycles have occurred.
NOTE:
Test numbers refer to test numbers on diagnostic table. For circuit number identification, see WIRING DIAGRAMS
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- 2) This test checks for proper contact and/or corrosion or Yellow 2-way connector.
- 7) This test checks for malfunctioning discriminating sensor.
- 8) This test checks for open in CKT 1751.
- 11) This test isolates open in CKT 1751 to one side of connector C114.
- 14) This tests checks for proper contact and/or corrosion of inflatable restraint control module connector.
- 19) This test checks for open in CKT 349.
- 22) This test isolates open in CKT 349 to one side of connector C114.
- 25) This test checks for short to voltage in CKT 349.
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.