Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2000C TAHOE 2WD V8-4.8L VIN VREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTIGNITION SYSTEMIGNITION RELAYTESTING AND INSPECTION
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN V
Ignition Relay: Testing and Inspection
2000 Chevrolet C Tahoe 2WD V8-4.8L VIN VSECTION Testing and Inspection
Ignition Relay Diagnosis
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.
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.
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.