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Home >> Cadillac >> 2013 >> Escalade Hybrid, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls/Fuel - 5.3L, 6.0L, 6.2L - DTC P0010 To DTC P0430) >> Diagnostic Information and Procedures >> DTC P0102 or P0103 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
NOTE:

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

  1. Ignition OFF, disconnect the harness connector at the B75B Mass Air Flow/Intake Air Temperature sensor. It may take up to 2 minutes for all vehicle systems to power down.
  2. Test for less than 2 Ω between the ground circuit terminal B and ground.
    • If 2 Ω or greater 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ground circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, repair the open/high resistance in the ground connection.
    • If less than 2 Ω 
  3. Ignition ON, verify a test lamp illuminates between the ignition voltage circuit terminal C and ground.
    • If the test lamp does not illuminate and the circuit fuse is good 
    1. Ignition OFF.
    2. Test for less than 2 Ω in the ignition voltage circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, verify the fuse is not open and there is voltage at the fuse.
    • If the test lamp does not illuminate and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the ignition voltage circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for greater than 2 Ω between the ignition voltage circuit terminal C and ground.
      • If less than 2 Ω, repair the short to ground on the circuit.
      • If greater than 2 Ω, test all the components connected to the circuit and repair or replace as necessary.
    • If the test lamp illuminates 
  4. Ignition ON, test for 4.8-5.2 volts between the MAF signal circuit terminal A and ground.
    • If less than 4.8 V 
    1. Ignition OFF, disconnect the harness connector at the engine control module.
    2. Test for infinite resistance between the signal circuit and ground.
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance
    3. Test for less than 2 Ω in the signal circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the engine control module.
    • If greater than 5.2 V 
    1. Ignition OFF, disconnect the harness connector at the engine control module, ignition ON.
    2. Test for less than 1 V between the signal circuit and ground.
      • If 1 V or greater, repair the short to voltage on the circuit.
      • If less than 1 V, replace the engine control module.
    • If between 4.8-5.2 V 
  5. Ignition OFF, connect the leads of the EN-38522-A  Variable Signal Generator as follows:
    • Red lead to the signal circuit terminal A at the harness connector
    • Black leads to ground
    • Battery voltage supply lead to B+
  6. Set the EN-38522-A  Variable Signal Generator to the following specifications.
    • Signal switch to 5 V
    • Frequency switch to 5 KHz
    • Duty Cycle switch to Normal
  7. Engine idling, observe the scan tool MAF Sensor parameter. The scan tool MAF Sensor parameter should be between 4,950-5,050 Hz.
    • If not between 4,950-5,050 Hz. 

      If not between 4,950-5,050 Hz., replace the engine control module.

    • If between 4,950-5,050 Hz. 
  8. Test or replace the B75B Mass Air Flow /Intake Air Temperature sensor.
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