NOTE: For wiring diagrams, see WIRING DIAGRAMS article in the ENGINE PERFORMANCE Section. For vacuum diagrams, see VACUUM DIAGRAMS article in the ENGINE PERFORMANCE Section.

Turn ignition off. Remove ACG fuse in underdash fuse box for 10 seconds to reset ECU. Start engine, and connect jumper wire to diagnostic connector. Observe CHECK ENGINE light. If light is not flashing, problem is intermittent. Check for poor or loose connections at throttle angle sensor and terminals at connector C355 at right front shock tower.
Test drive, and check again. If CHECK ENGINE light flashes Code 7, turn ignition off. Disconnect 3-wire connector at throttle angle sensor. See Fig 1 .

Fig 1: Identifying Throttle Angle Sensor Connector
Courtesy of AMERICAN HONDA MOTOR CO., INC.
Turn ignition on. Measure voltage between Yellow/White (positive) and Green/White (negative) terminals. If 5 volts are present, go to step 6). If reading is not 5 volts, measure voltage between Yellow/White (positive) wire terminal and ground. If reading is about 5 volts, repair open in Green/White wire between D22 and throttle angle sensor.
If reading is not about 5 volts, turn ignition off. Connect ECU test harness. See Figure . Turn ignition on. Measure voltage between wire terminals D20 and D22. If voltage is about 5 volts, repair open in Yellow/White wire between D20 and throttle angle sensor.
If voltage is not about 5 volts, substitute a known good ECU. If voltage is okay, replace ECU.
If reading of first test of step 3) is about 5 volts, turn ignition off. Reconnect throttle angle sensor connector. Connect ECU test harness between ECU and ECU connector. Turn ignition on. Measure voltage between wire terminals D11 (positive) and D22 (negative) at wide open throttle.
Check voltage change between closed throttle and wide open throttle. If reading is not about .5 volt (closed throttle) and 4.5 volts (open throttle), repair open in Red/Blue wire between ECU terminal D11 and throttle angle sensor. If wire is okay, replace throttle angle sensor.
If voltage reading goes from .5 volt (closed throttle) to 4.5 volts (open throttle), substitute a known good ECU. If condition goes away, replace ECU.

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.

Safety Warning

Code 7: Throttle Angle Sensor

Use the Manual With the Right Hardware

When to See a Mechanic

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