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Home >> Chevrolet >> 2022 >> Tahoe PPV, RWD >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Automatic Transmission - 10L80 (MHS MQC) - Diagnostic Information And Procedures (1 Of 2) >> Diagnostic Information and Procedures >> DTC P0815, P0816, or P0826 - Manual Mode or Tap Up/Tap Down Switch Malfunction >> Circuit/System Testing

Circuit/System Testing

    NOTE:
    • Circuit/System Verification must be performed before proceeding with Circuit/System Testing.
    • It may take up to 2 min for all vehicle systems to power down before an accurate ground or low reference circuit continuity test can be performed.
  1. Ignition/Vehicle & All vehicle systems - Off
  2. Disconnect the electrical connector: K212 Gear Shift Control Module
  3. Test for less than 10 ohms between the test points: Ground circuit terminal 12 & Ground
    • If 10 ohms or greater 
    1. Disconnect the appropriate ground connection: Ground terminal
    2. Test for less than 2 ohms between the test points: Ground circuit terminal 12 & The other end of the circuit
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Repair the open/high resistance in the ground connection.
    • Go to next step: If less than 10 ohms 
  4. Ignition - On / Vehicle - In Service Mode
  5. Test for 4.8 to 5.2 V between the test points: Signal circuit terminal 11 & Ground
    • If less than 4.8 V 
    1. Disconnect the appropriate electrical connector: K9 Body Control Module
    2. Test for infinite resistance between the test points: Signal circuit terminal 11 @ Component harness & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance
    3. Test for less than 5 ohms between the test points: Signal circuit terminal 11 @ Component harness & The other end of the circuit @ Control module harness
      • If greater than 5 ohms - Repair the open/high resistance in the circuit.
      • If 5 ohms or less - Replace the component: K9 Body Control Module
    • If greater than 5.2 V 
    1. Disconnect the appropriate electrical connector: K9 Body Control Module
    2. Test for less than 1 V between the test points: Signal circuit terminal 11 @ Component harness & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V - Replace the component: K9 Body Control Module
    • Go to next step: If between 4.8 and 5.2 V 
  6. Test or replace the component: S2 Automatic Transmission Manual Shift Shaft Position Switch
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