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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 514 (Engine Controls/Fuel - Hybrid (LZ1) - DTC P0351 To DTC P3449 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P2228 or P2229 >> Component Testing

Component Testing

WARNING: This page is about a different car, the 2012 GMC Yukon, 2012 Chevrolet Tahoe, and 2012 Cadillac Escalade. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:

You must perform the Circuit/System Testing before proceeding with the Component Testing.

  1. Ignition OFF, remove the BARO sensor.
  2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 and the corresponding terminal of the BARO sensor.
  3. Install a jumper wire between the low reference circuit terminal 2 of the BARO sensor and ground.
  4. Install a jumper wire at terminal B of the BARO sensor.
  5. Connect a DMM between the jumper wire from terminal 3 of the BARO sensor and ground.
  6. Ignition ON, with the J-23738-A  mityvac or J-35555  metal mityvac, slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 V without any spikes or dropouts.
    • If the voltage reading is erratic, replace the BARO sensor.
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