LEMON Manuals: Even more car manuals for everyone
Home >> Buick >> 2019 >> Encore Base >> Repair and Diagnosis >> Electrical >> Charging Systems >> Battery, Charging System And Starting System >> Diagnostic Information and Procedures >> DTC P26E4-P26E6 >> Circuit/System Testing

Circuit/System Testing

    NOTE:

    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. Remove the component:KR27C Starter Pinion Solenoid Actuator Relay
  3. Test for less than 10 ohms between the test points:Ground circuit terminal 86 @ Relay Socket & Ground
    • If 10 ohms or greater 
    1. Disconnect - Ground
    2. Test for less than 2 ohms between the test points:Ground circuit terminal 86 @ Relay Socket & Ground
      • 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. Verify a test lamp turns On between the test points:B+ circuit terminal 30 & Ground
    • If the test lamp does not turn On and the circuit fuse is OK 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    2. Test for less than 2 ohms between the test points: B+ circuit terminal 30 & Output terminal @ Fuse
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Verify the fuse is OK and there is voltage at the fuse.
    • If the test lamp does not turn On and the circuit fuse is open 
    1. Ignition OFF.
    2. Test for infinite resistance between the B+ circuit and ground.
      • Ignition/Vehicle - Off & Remove - Test lamp
      • Test for infinite resistance between the test points:B+ circuit terminal 30 & Ground
      • If less than infinite resistance - Repair the short to ground on the circuit.
      • Go to next step: If infinite resistance,
    3. Disconnect the component:M64 Starter Motor
    4. Test for infinite resistance between the test points:Control circuit terminal 87 & & Ground
      • If less than infinite resistance, repair the short to ground on the circuit.
      • If infinite resistance, replace the M64 Starter Motor.
    • Go to next step: If the test lamp turns On 
  6. Connect a test lamp between the test points:Ground circuit terminal 86 & Control circuit terminal 85
  7. If available - Perform the scan tool control function:Starter Pinion Solenoid Actuator Relay Command - On and Off

    or

    If available - Cycle the ignition from OFF to ON. - Park Brake Applied - Clutch pedal fully pressed - Manual Transmissionor - Transmission in Park - Automatic Transmission

    - 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:K20 Engine Control Module
    3. Test for infinite resistance between the test points:Control circuit terminal 85 @ 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 is always On 
    1. Ignition/Vehicle - Off & Remove - Test lamp
    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 85 @ Relay Socket & Ground
      • If 1 V or greater - Repair the short to voltage on the circuit.
      • Go to next step: If less than 1 V
    5. Ignition/Vehicle - Off
    6. Test for less than 2 ohms between the test points:Control circuit terminal 85 @ Relay Socket & The other end of the circuit @ Control module harness
      • If 2 ohms or greater - Repair the open/high resistance in the circuit.
      • If less than 2 ohms - Replace the component:K20 Engine Control Module
    • Go to next step: If the test lamp turns On and Off 
  8. Connect a 30 A fused jumper wire between the test points:B+ circuit terminal 30 @ Relay Socket & Control circuit terminal 87 @ Relay Socket
  9. Verify the component activates:M64 Starter Motor
    • If the component does not activate 
    1. Ignition/Vehicle - Off & Remove - Jumper wire(s)
    2. Disconnect the electrical connector:M64 Starter Motor
    3. Test for infinite resistance between the test points:Control circuit terminal X1 2/X1 1/X1 A @ 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
    • Go to next step: If the component activates 
  10. Test or replace the component:KR27C Starter Pinion Solenoid Actuator Relay
scientia non olet · About LEMON Manuals