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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 5 (Engine Controls And Fuel - 6.0L (L96) - DTC P0010 To DTC P0341) >> Diagnostic Information And Procedures >> DTC P0106: Manifold Absolute Pressure (MAP) Sensor Performance >> Component Testing >> Erratic Signal Test

Erratic Signal Test

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, remove the B74 Manifold Absolute Pressure Sensor and disconnect the harness.
  2. Install a 3 A fused jumper wire between the 5 V reference circuit terminal 1 of the sensor and the sensor harness.
  3. Install a jumper wire between the low reference circuit terminal 2 of the sensor and ground.
  4. Install a jumper wire to the signal circuit terminal 3 of the sensor.
  5. Connect a DMM between the jumper wire and ground.
  6. Ignition ON, observe the DC voltage on the DMM. Slowly apply between 0-15 kPa (0 - 4.4 in Hg) of vacuum to the sensor with the GE-23738-A  .
  7. Verify the voltage changes, without any spikes or dropouts, between 0.2 - 4.9 V.
    • If not between 0.2 - 4.9 V or has spikes or dropouts 

      Replace the B74 Manifold Absolute Pressure Sensor.

    • Go to next step: If between 0.2 - 4.9 V and there are no spikes or dropouts 
  8. All OK.
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