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.
Main Relay (Computer/Fuel System): Testing and Inspection
2008 Acura RL V6-3.5LSECTION Testing and Inspection
Power Relay Test
Use this chart to identify the type of relay, then do the test listed for it.
NOTE: For the turn signal/hazard relay 1 input test, refer to Lighting and Horns.
Normally-open type A
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 2 terminals when power is connected to the No. 4 terminal and ground the No. 3 terminal.
- There should be no continuity between the No. 1 and No. 2 terminals when power is disconnected.
Normally-open type B
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 3 terminals when power and ground are connected to the No. 2 and No. 4 terminals.
- There should be no continuity between the No. 1 and No. 3 terminals when power is disconnected.
Normally-open type C
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 3 terminals when battery positive terminal is connected to the No. 2 terminal, and battery negative terminal is connected to the No. 4 terminal.
- There should be no continuity between the No. 1 and No. 3 terminals when power is disconnected.
Use this chart to identify the type of relay, then do the test listed for it.
NOTE: For the turn signal/hazard relay 1 input test, refer to Lighting and Horns.
Normally-open type A
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 2 terminals when power is connected to the No. 4 terminal and ground the No. 3 terminal.
- There should be no continuity between the No. 1 and No. 2 terminals when power is disconnected.
Normally-open type B
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 3 terminals when power and ground are connected to the No. 2 and No. 4 terminals.
- There should be no continuity between the No. 1 and No. 3 terminals when power is disconnected.
Normally-open type C
Check for continuity between the terminals.
- There should be continuity between the No. 1 and No. 3 terminals when battery positive terminal is connected to the No. 2 terminal, and battery negative terminal is connected to the No. 4 terminal.
- There should be no continuity between the No. 1 and No. 3 terminals when power is disconnected.
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.