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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 3 (Supplemental Inflatable Restraint System) >> Diagnostic Information and Procedures >> DTC B0074 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: Important: The PPS pressure sensor is not serviced separately. The PPS replacement with the PPS pressure sensor must be serviced as a complete unit.
  • The PPS pressure sensor
  • The PPS module
  • The PPS pressure sensor wiring harness connector
  • The PPS module wiring harness connector
  1. Ignition OFF, disconnect the PPS pressure sensor connector and inspect the component and harness sides for damage or corrosion.
    • If damage or corrosion is found, repair or replace as necessary.
  2. Ignition ON, test for 4.5-5.5 volts between the voltage reference circuit terminal A and ground.
    • If less that the specified range, test the voltage reference circuit for open/high resistance or a short to ground. If the circuit tests normal, replace the PPS.
    • If greater that the specified range, test the voltage reference circuit for a short to voltage. If the circuit tests normal, replace the PPS.
    IMPORTANT: The AIRBAG Fuse that supplies B+ voltage must be removed to ensure the PPS module is inactive. An active PPS module may cause inaccurate resistance readings.
  3. Ignition OFF, remove the AIRBAG Fuse. Test for less than 2.0 ohms of resistance between low reference terminal C and ground.
    • If greater than specified, test the low reference circuit for open/high resistance. If the circuit tests normal, replace the PPS.
  4. Ignition OFF, disconnect the PPS module connector.
  5. Test the pressure sensor signal circuit for a short to ground, open/high resistance, or short to voltage. No short to ground, open/high resistance, or short to voltage should exist.
    • If any of the above conditions exist, make the appropriate repair.
  6. If all circuits test normal, replace the PPS which includes the pressure sensor, module and seat foam.
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