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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 13 (Engine Controls And Fuel - 3.0L (Lm2) Diesel - Diagnostic Information And Procedures (4 Of 5)) >> Diagnostic Information and Procedures >> DTC P157A or P16D7-P16D9 >> Component Testing

Component Testing

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KR200 Engine Controls Sensor Supply Voltage Relay-Dynamic Test

  1. Ignition/Vehicle - Off
  2. Disconnect the electrical connector: X50A Engine Wiring Harness Junction Block
  3. Connect a 3 A fused jumper wire between the test points: Control terminal X3 - C5 & 12 V
  4. Connect a jumper wire between the test points: Ground terminal X1 - A4 & Ground
  5. Test for less than 2 ohms between the test points: Control terminal X5 - A & F80UA Fuse - Input terminal
    • If greater than 2 ohms 

      Replace the component: X50A Engine Wiring Harness Junction Block

    • Go to next step: If less than 2 ohms 
  6. Remove - Jumper Wire(s)
  7. Test for infinite resistance between the test points: Control terminal X5 - A & F80UA Fuse - Input terminal
    • If less than infinite resistance 

      Replace the component: X50A Engine Wiring Harness Junction Block

    • Go to next step: If infinite resistance 
  8. All OK.
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