Ignition Relay: Testing and Inspection

Ignition Relay Diagnosis

Diagnostic Chart:

Schematic:

CIRCUIT DESCRIPTION
The ignition relay supplies ignition voltage to the following components:
^ Injectors and ignition coils
^ AIR relay

DIAGNOSTIC AIDS
The following may cause an intermittent:
^ Poor connections - Check for adequate terminal tension. Refer to Testing for Intermittent and Poor Connections in Diagrams.
^ Corrosion
^ Mis-routed harness
^ Rubbed through wire insulation
^ Broken wire inside the insulation

TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
2. Refer to Thumbnail Schematic for proper relay terminal identification.
4. This step is testing the relay ground circuit.
5. This step isolates the circuit from the IGN relay. All of the circuits at the relay are good if the test lamp illuminates.
9. The open circuit will be between the splice and the IGN relay.
10. Remove the underhood electrical center cover and inspect the circuits that are supplied a voltage by the IGN relay.