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Home >> Chevrolet >> 2020 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different car >> Section 9 (Automatic Transmission - 5ET50 (MKE)) >> Diagnostic Information and Procedures >> DTC P1824, P182A-P182F, P1838-P1841, P18B5-P18BA, P18BC, P18BF, P18C0, P18C2, or P18C3 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2019 Chevrolet Malibu. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE:

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

  1. Vehicle OFF, remove the control valve body cover. Refer to Control Valve Body Cover Replacement .
  2. Disconnect the harness connector at the B15 Transmission Internal Mode Switch.
  3. Vehicle in Service Mode.
  4. Test for 8.3V to 9.4V between both 9V reference circuits terminal 1, terminal 8 and ground.
    • If not within the specified range 

      Test the voltage circuits for an open/high resistance end to end.

    • If 2 Ω or greater, replace the A/Trans Wiring Extension Harness Assembly.
    • If 2 Ω or less, replace the T6 Power Inverter Module.
    • Go to next step: If within the specified range 
  5. Vehicle ON.
  6. Install a 3 A fused jumper wire between each signal circuit listed below and the 9V reference circuit:
    • Switch Signal A: terminal 2 and terminal 1
    • Switch Signal B: terminal 6 and terminal 8
    • Switch Signal C: terminal 3 and terminal 1
    • Switch Signal P: terminal 7 and terminal 8
    • Switch Signal S: terminal 5 and terminal 8
  7. Verify each scan tool Internal Mode Switch A/B/C/P/S voltage parameter displays 4.88 - 5.12 V when jumped.
    • If any parameter does not display 4.88 - 5.12 V when jumped 

      Test the signal circuit for an open/short to voltage or short together.

    • If an open/short to voltage or short together is found, replace the Automatic Transmission Wiring Harness - Shift Shaft Position Switch.
    • If an open/short to voltage or short together is not found, replace the T6 Power Inverter Module.
    • Go to next step: If each signal circuit parameter displays 4.88 - 5.12 V when jumped 
  8. Replace the B15 Transmission Internal Mode Switch.
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