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Home >> Chevrolet >> 2017 >> Malibu LS >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 29 (Engine Controls And Fuel - 1.8L (LKN) - DTC P0446 To DTC P2635 And Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P24B9-P24BB: Evaporative Emission (EVAP) System Leak Detection Pump Pressure Sensor >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Vehicle OFF, all systems OFF, disconnect the harness connector at the Q63 Evaporative Emission System Leak Detection Pump Assembly.
  2. Test for less than 5 Ω of resistance between the low reference circuit terminal 8 and ground.
    • If 5 Ω or greater 
    1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for less than 2 Ω in the low reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
    • If less than 5 Ω 
  3. Vehicle in Service Mode.
  4. Test for 4.8 - 5.2 V between the 5 V reference circuit terminal 6 and ground.
    • If less than 4.8 V 
    1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the 5 V reference 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 5 V reference circuit end to end.
      • If 2 Ω or greater, repair the open/high resistance in the circuit.
      • If less than 2 Ω, replace the K20 Engine Control Module.
      • If greater than 5.2 V 
    1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Vehicle in Service Mode.
    2. Test for less than 1 V between the 5 V reference circuit and ground.
    • If 1 V or greater, repair the short to voltage on the circuit.
    • If less than 1 V, replace the K20 Engine Control Module.
    • If between 4.8 - 5.2 V 
  5. Verify the scan tool EVAP Leak Detection Pump Pressure parameter is less than 0.2 V.
    • If 0.2 V or greater 
    1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module, Vehicle in Service Mode
    2. Test for less than 1 V between the signal circuit terminal 7 and ground.
    • If 1 V or greater, repair the short to voltage on the circuit.
    • If less than 1 V, replace the K20 Engine Control Module.
    • If less than 0.2 V 
  6. Install a 3 A fused jumper wire between the signal circuit terminal 7 and the 5 V reference circuit terminal 6.
  7. Verify the scan tool EVAP Leak Detection Pump Pressure parameter is greater than 4.7 V.
    • If 4.7 V or less 
    1. Vehicle OFF, disconnect the harness connector at the K20 Engine Control Module.
    2. Test for infinite resistance between the signal circuit terminal 7 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 K20 Engine Control Module.
    • If greater than 4.7 V 
  8. Test or replace the Q63 Evaporative Emission System Leak Detection Pump Assembly.
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