LEMON Manuals: Even more car manuals for everyone
Home >> GMC >> 2018 >> Acadia Denali, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 354 (Engine Controls And Fuel - 3.6L (LGX) - DTC P0010 To DTC P0459) >> Diagnostic Information and Procedures >> DTC P0201, P0202, P0203, P0204, P0205, P0206, P0261, P0262, P0264, P0265, P0267, P0268, P0270, P0271, P0273, P0274, P0276, or P0277: Cylinder Injector Control >> Circuit/System Testing

Circuit/System Testing

WARNING: This page is about a different car, the 2017 GMC Acadia. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition/Vehicle » Off
  2. Disconnect the appropriate electrical connector:Q17 Fuel Injector
  3. Ignition » On / Vehicle » In Service Mode
  4. Verify the appropriate scan tool parameter Cylinder 1-6 Injector Control Circuit Status =Open
    • If the parameter displays the following:High Control Circuit High Voltage 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector: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 2 @Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K20 Engine Control Module
    • If the parameter displays the following:High Control Circuit Low Voltage 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 2 @Component harness & 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 parameter displays the following:Open 
  5. Connect a 3 A fused jumper wire between the test points:Control circuit terminal 2 @Component harness & Ground
  6. Verify the appropriate scan tool parameter Cylinder 1-6 Injector Control Circuit Status =High Control Circuit Low Voltage
    • If not the specified state 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for less than 2 Ω between the test points:Control circuit terminal 2 @Component harness &
      • {Q17A Fuel Injector 1}Terminal 69 @Control module harness
      • {Q17B Fuel Injector 2}Terminal 68 @Control module harness
      • {Q17C Fuel Injector 3}Terminal 72 @Control module harness
      • {Q17D Fuel Injector 4}Terminal 70 @Control module harness
      • {Q17E Fuel Injector 5}Terminal 67 @Control module harness
      • {Q17F Fuel Injector 6}Terminal 71 @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 specified state 
  7. Connect a 3 A fused jumper wire between the test points:Control circuit terminal 2 & Control circuit terminal 1 @Component harness
  8. Verify the appropriate scan tool parameter Cylinder 1-6 Injector Control Circuit Status =OK
    • If the parameter displays the following:High Control Circuit High Voltage 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector: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 1 @Component harness & Ground
      • If 1 V or greater » Repair the short to voltage on the circuit.
      • If less than 1 V » Replace the component:K20 Engine Control Module
    • If the parameter displays the following:High Control Circuit Low Voltage 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 1 @Component harness & 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 parameter displays the following:Open 
    1. Ignition/Vehicle » Off
    2. Disconnect the electrical connector:K20 Engine Control Module
    3. Test for less than 2 Ω between the test points:Control circuit terminal 1 @Component harness &
      • {Q17A Fuel Injector 1}Terminal 49 @Control module harness
      • {Q17B Fuel Injector 2}Terminal 48 @Control module harness
      • {Q17C Fuel Injector 3}Terminal 52@Control module harness
      • {Q17D Fuel Injector 4}Terminal 50 @Control module harness
      • {Q17E Fuel Injector 5}Terminal 47@Control module harness
      • {Q17F Fuel Injector 6}Terminal 51 @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 parameter displays the following:OK 
  9. Test or replace the component:Q17 Fuel Injector
scientia non olet · About LEMON Manuals