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.
Relay Control Module Test
The relay control module is part of the under-hood fuse/ relay box, and it contains these relays:
- PGM-FI main relay 1
- Ignition coil relay
- PGM-FI subrelay
- ETCS relay
If any of these relays fail the test, replace the under-hood fuse/relay box.
- Do the battery terminal disconnection procedure,(see BATTERY TERMINAL DISCONNECTION AND RECONNECTION then disconnect under-hood fuse/relay box connectors C (2P), E (14P), and H (9P).
- Connect battery power to the C2 terminal.
PGM-FI main relay 1:
- Connect the E5 terminal to body ground. There should be battery voltage between the H1 terminal and body ground.
- Disconnect the E5 terminal from the body ground. There should be no voltage between the HI terminal and the body ground.
Ignition coil relay:
- Connect the E5 terminal to body ground. There should be battery voltage between the H6 terminal and body ground.
- Disconnect the E5 terminal from the body ground. There should be no voltage between the H6 terminal and the body ground.
PGM-FI subrelay:
- Connect the E5 and E13 terminals to body ground. There should be battery voltage between the H9 terminal and body ground.
- Disconnect the E5 terminal from the body ground. There should be no voltage between the H9 terminal and the body ground.
ETCS relay:
- Connect the E5 and E14 terminals to body ground. There should be battery voltage between the H7 terminal and body ground.
- Disconnect the E5 terminal from the body ground. There should be no voltage between the H7 terminal and the body ground.
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.