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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 P0685-P0687, P0689, P0690 or P1682: Engine Controls Ignition Relay, Ignition 1 Switch Circuit 2 >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different variant/trim than selected.
  1. Vehicle Off.
  2. Remove the component: KR75 Engine Controls Ignition Relay
  3. Verify a test lamp turns On between the test points:
    • B+ circuit terminal 30 / 5 & Ground
    • B+ circuit terminal 85 / 2 & Ground
    • If the test lamp does not turn On 

      Replace the component: X50A Fuse Block - Underhood

    • If the test lamp turns On 
  4. Ignition - On / Vehicle - In Service Mode
  5. Connect a test lamp between the test points: Control circuit terminal 86 / 1 & B+ circuit
  6. Perform the scan tool control function: KR75 Engine Controls Ignition Relay - On and Off

    Verify the test lamp turns On and Off.

    • If the test lamp is always Off 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
    3. Ignition - On / Vehicle - In Service Mode
    4. Test for less than 1 V between the test points: Control circuit terminal 86 / 1 @ Relay Socket & Terminal 67 @ Control module harness
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 Ω between the test points: Control circuit terminal 86 / 1 @ Relay Socket & Terminal 67 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K20 Engine Control Module
    • If the test lamp is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
    3. Test for infinite resistance between the test points: Control circuit terminal 86 / 1 @ Relay Socket & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K20 Engine Control Module
    • If the test lamp turns On and Off 
  7. Verify the fuse is not open:
    • F75UA Fuse
    • F83UA Fuse
    • F84UA Fuse
    • If the fuse is open 
    1. Vehicle Off.
    2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
    3. Test for infinite resistance between the test points: Output terminal @ Fuse & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • If infinite resistance - Replace the component: K20 Engine Control Module
    • If the fuse is not open 
  8. Ignition - On / Vehicle - In Service Mode
  9. Verify a test lamp does not turn On between the test points: KR75 Engine Controls Ignition Relay Terminal 87 & Ground
    • If the test lamp turns On 
  10. Disconnect the electrical connector: X1 @ K20 Engine Control Module
  11. Test for less than 1 V between the test points:
    • Control circuit terminal 73 @ Control module harness & Ground
    • Control circuit terminal 16 @ Control module harness & Ground
    • If 1 V or greater - Repair the short to voltage on the circuit.
    • If the test lamp does not turn On 
  12. Vehicle Off.
  13. Connect a 30 A fused jumper wire between the test points: Control circuit terminal 87 / 3 & B+ circuit terminal 30 / 5
  14. Ignition - On / Vehicle - In Service Mode
  15. Verify the scan tool parameter: Engine Controls Ignition Relay Feedback Signal=Within 1 V of the battery voltage
    • If not within 1 V of the battery voltage 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector: X1 @ K20 Engine Control Module
    3. Test for less than 2 Ω between the test points:
      • Control circuit terminal 87 / 3 @ Relay Socket & Control circuit terminal 73 @ Control module harness
      • Control circuit terminal 87 / 3 @ Relay Socket & Control circuit terminal 16 @ Control module harness
      • If 2 Ω or greater - Repair the open/high resistance in the circuit.
      • If less than 2 Ω - Replace the component: K20 Engine Control Module
    • If within 1 V of the battery voltage 
  16. Test or replace the component: KR75 Engine Controls Ignition Relay
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