Circuit/System Testing

• If 10 V or less 

1. Ignition/Vehicle - Off
2. Disconnect the electrical connector: K20 Engine Control Module
3. Test for infinite resistance between the test points: Ignition circuit terminal@K20 Engine Control Module & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.
   • Go to next step: If infinite resistance

• 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 greater than 10 V 

1. Ignition/Vehicle - Off
2. Test for less than 10 ohms between the test points: Ground circuit terminal 86 & Ground
   • If 10 ohms or greater 
3. Ignition/Vehicle - Off
4. Test for less than 2 ohms between the test points: Ground circuit terminal 2@Component harness & The other end of the circuit@ Ground terminal
   • 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 
5. Ignition/Vehicle - Off
6. Verify a test lamp turns On between the test points: B+ circuit terminal 30 & KR27C Starter Pinion Solenoid Actuator Relay & Output terminal@<p01> 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 

• If less than infinite resistance - Repair the short to ground on the circuit.
• If infinite resistance

• Go to next step: If the test lamp turns On 

• If less than infinite resistance - Repair the short to ground on the circuit.
• If infinite resistance - Replace the component: M64 Starter Motor

• Go to next step: If the test lamp turns On 

or

If available - Cycle the ignition from OFF to ON. - Park Brake Applied - Clutch pedal fully pressed - Manual Transmission or - 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. Ignition - On / Vehicle - In Service Mode
4. Test for infinite resistance between the test points: Control circuit terminal 85@ KR27C Starter Pinion Solenoid Actuator Relay & Ground
   • If less than infinite resistance - Repair the short to ground on the circuit.
   • Go to next step: If infinite resistance
5. Ignition/Vehicle - Off
6. Test for less than 2 ohms between the test points: Control circuit terminal 85@KR27C Starter Pinion Solenoid Actuator Relay & 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
   • If the test lamp is always On 
7. Ignition/Vehicle - Off & Remove - Test lamp
8. Disconnect the electrical connector: K20 Engine Control Module
9. Test for greater than 1 V between the test points: Control circuit terminal 85@KR27C Starter Pinion Solenoid Actuator Relay & 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

• Go to next step: If the test lamp does not turn On and Off 

• If the component does not activate 

• If the component does not activate 

• Go to next step: If the component activates