• Perform the Diagnostic System Check prior to using this diagnostic procedure:Diagnostic System Check - Vehicle
• Review the description of Strategy Based Diagnosis:Strategy Based Diagnosis
• An overview of each diagnostic category can be found here:Diagnostic Procedure Instructions

For an overview of the component/system, refer to:Electronic Ignition System Description

The ECM monitors and compares the voltages supplied by the relay(s).

• Delayed starting=For greater than 5 engine revolutions
• KR75 Engine Controls Ignition Relay=Greater than 11 V
• Run/Crank Relay=Greater than 5 V

Frequency the DTC runs=Continuously—After the running conditions are met

Ignition Coil Supply Voltage=Less than 2.5 V

DTCs listed in the DTC Descriptor category=Type B DTC

DTCs listed in the DTC Descriptor category=Type B DTC

Engine Controls Schematics

Master Electrical Component List

• Circuit Testing
• Connector Repairs
• Testing for Intermittent Conditions and Poor Connections
• Wiring Repairs

Powertrain Diagnostic Trouble Code (DTC) Type Definitions

Control Module References

1. Ignition » On / Vehicle » In Service Mode
2. Verify the scan tool parameter:Ignition Coil Supply Voltage=On
• If not the specified state

  Refer to: Circuit/System Testing

• If the specified state
3. Operate the vehicle within the Conditions for Running the DTC. You may also operate the vehicle within the conditions that you observed from the Freeze Frame/Failure Records data.

   Verify the DTC does not set.

• If the DTC sets

  Refer to: Circuit/System Testing

• If the DTC is not set
4. All OK.

1. Ignition/Vehicle » Off
2. Disconnect the electrical connector:X1@K20 Engine Control Module
3. Connect a 3 A fused jumper wire between the test points:Control circuit terminal 67&Ground
4. Ignition » On / Vehicle » In Service Mode
5. Verify a test lamp turns On between the test points:Ignition circuit terminal 51&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 Ω between the test points:Ignition circuit terminal 51@Control module harness&Output terminal@Fuse
• If 2 Ω or greater » Repair the open/high resistance in the circuit.
• If less than 2 Ω » 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/Vehicle » Off
2. Replace the component:F16UA Fuse
3. Ignition » On / Vehicle » In Service Mode
4. Verify the fuse does not open.
• If the fuse opens and there are components connected to the circuit » Disconnect a component and repeat procedure starting at step 5.1
• If the fuse opens with all components disconnected from the circuit » Repair the short to ground on the circuit.
• If the fuse does not open after disconnecting a component from the circuit » Replace the component disconnected last.
• If the fuse does not open with all components connected, except the following component:K20 Engine Control Module
5. Ignition/Vehicle » Off
6. Connect the electrical connector:K20 Engine Control Module
7. Replace the component:F16UA Fuse
8. Ignition » On / Vehicle » In Service Mode
9. Verify the fuse does not open.
• If the fuse is open » Replace the component:K20 Engine Control Module
• If the fuse does not open.

Note: It may be necessary to use a scan tool control function to operate a component.

10. Operate the component:Each component on the circuit—One at a time

Verify the fuse does not open when any of the components are activated.

• If the fuse opens » Replace the component that caused the fuse to open when activated.
• If the fuse does not open.
11. All OK.
• If the test lamp turns On
6. Replace the component:K20 Engine Control Module

Perform the Diagnostic Repair Verification after completing the repair:Diagnostic Repair Verification

• Ignition Coil Replacement
• For control module replacement, programming, and setup refer to:Control Module References