Accord 1985-88
1. Disconnect the connector from the control unit. Connect the cable test system (07999-PD6000A or equivalent) between the control unit and the cable connector.
2. Turn on the ignition. Connect the positive probe of the digital voltmeter to terminal C9 of the cable test system and the negative probe to terminal C12. Measure the voltage between the terminals. The voltmeter should read 2.76-2.96 V.
3. If the voltage does not match the standard, check the wires between the computer and the PA sensor for a possible short circuit. If the wires are OK, replace the PA sensor.