Checking the functionality of the control electromagnetic valve of the afterburner (Honda Accord 3)

The afterburner control solenoid valve controls the afterburner valve by applying vacuum to a diaphragm that holds it closed. The afterburner valve senses changes in the intake manifold vacuum during gear shifting or braking and supplies clean air to the intake manifold to prevent unburned fuel from escaping.

Disconnect the solenoid valve vacuum hose #31 from the vacuum manifold.



Disconnect the solenoid valve vacuum hose No.30 from the vacuum manifold and connect the vacuum pump.

Start the engine and create a vacuum.

CAUTION! The coolant temperature must be below 70°C.

If the electromagnetic valve holds a vacuum, then see point A), if not - point B).

A) Turn off the engine.

Disconnect the 4-pin connector near the solenoid valve.

Start the engine.

Measure the voltage between the White/Blue(+) and Black(-) terminals on the main wiring harness.

If there is battery voltage, then the solenoid valve should be replaced.

If there is no voltage, then you should measure the voltage between the White/Blue(+) contact and ground.

If there is battery voltage, then the break in the Black conductor between the solenoid valve and point G5 should be repaired.





If there is no voltage, then you should check for a break in the Blue/Yellow wire between the electromagnetic valve and terminal 26 of the control unit. If the wire is normal, then you should refer to the diagnostics section of the control module inputs.

B) Turn off the engine.

Block the rear wheels and apply the parking brake. Jack up the front of the car and support it securely with jack stands.

Start the engine.

Shift the transmission into second gear and accelerate the engine to a speed of over 25 km/h.

Create a vacuum.

If the electromagnetic valve holds a vacuum, then see item B1), if not - item B2).

B1) Warm up the engine to operating temperature until the cooling fan comes on.

Create a vacuum.

If the solenoid valve holds a vacuum, the vacuum line should be checked for proper connection, cracks, plugs, or a disconnected hose.

If the solenoid valve does not hold vacuum, then you should refer to the control module input diagnostics section.

B2) Turn off the engine.

Disconnect the 4-pin connector near the solenoid valve.

Start the engine and accelerate it to a speed of over 25 km/h.

Measure the voltage between the White/Blue (+) and Black (-) terminals on the main wiring harness.



If there is battery voltage, then you should refer to the section on diagnostics of control module inputs. If there is no voltage, then the solenoid valve should be replaced.

(Original article on the website «Hondabook.ru»)