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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1108 (Tire Pressure Monitoring System) >> Diagnostic Information and Procedures >> DTC C0750, C0755, C0760, or C0765 (W/UH3) >> Circuit/System Testing

Circuit/System Testing

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  1. Ignition OFF, test for less than 2.0 ohms of resistance between the tire pressure module ground circuit terminal 10 and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  2. Ignition ON, verify that a test lamp illuminates between the tire pressure module terminal 1 and ground.
    • If the test lamp does not illuminate, test for an open/high resistance or short to ground in the B+ circuit. If the circuit tests normal, replace the tire pressure module.
  3. Ignition OFF, disconnect the harness connector at the affected tire pressure receiver.
  4. Ignition OFF, test for less than 2 ohms of resistance between the low reference circuit terminal 3 and ground.
    • If greater than the specified range, test the low reference circuit for an open/high resistance. If circuit tests normal, replace the tire pressure module.
  5. Ignition ON, test for 4.75-5.25 volts between the 5-volt reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the tire pressure module.
    • If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the tire pressure module.
  6. Ignition OFF, replace the affected tire pressure receiver with a known good part from one of the other locations.
  7. Ignition ON, use the special tool to simulate the tire pressure sensor. Verify the scan tool displays an accurate tire pressure that matches 27.6 kPa (4 psi) of the special tool simulation display parameters.
    • If the parameters do not match, test the signal circuit for a short to ground, open/high resistance, or short to voltage. If the circuit tests normal, replace the tire pressure module.
  8. Using the J-46079  , activate each tire pressure sensor and record each sensors transmission data and physical location. See Special Tools . Verify the J-46079  displays an 8-digit ID number, accurate tire pressure 27. See Special Tools .6 kPa (4 psi), Learn Mode, and at least a 1/4 graph signal strength displayed.
    • If any of the parameters listed above are not displayed, replace the suspect tire pressure sensor.
  9. Verify that the tire pressure sensors ID and locations displayed on the scan tool match the ID and location recorded from the special tool.
  10. Test drive the vehicle above 40 km/h (25 mph) for greater than 2 minutes. With the scan tool, observe the suspect Pressure Sensor Mode data parameter. Verify the sensor mode changes to Rolling.
    • If the suspect Pressure Sensor Mode does not change, replace the suspect tire pressure sensor.
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