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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1367 (Engine Controls And Fuel - Hybrid (Hp2) 6.0L (LFA) - DTC P0010 To DTC P0230) >> DTC P0069 >> Component Testing >> Erratic Signal Test

Erratic Signal Test

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the sensor.
  2. Install a 3A fused jumper wire between the 5-volt reference circuit terminal C and the corresponding terminal of the sensor.
  3. Install a jumper wire between the low reference circuit terminal A of the sensor and ground.
  4. Install a jumper wire at terminal B of the sensor.
  5. Connect a DMM between the jumper wire from terminal B of the sensor and ground.
  6. Ignition ON, with the J 23738-A  or J 35555  , slowly apply vacuum to the sensor while observing the voltage on the DMM. The voltage should vary between 0-5.2 volts without any spikes or dropouts.
    • If the voltage reading is erratic, replace the sensor.
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