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EGR SYSTEM CHECK

Disconnect the vacuum hose from the EGR solenoid, and then connect a hand vacuum pump via the three-way terminal.

Regarding the engine in cold and hot conditions, check the condition of vacuum when a rapid racing has been performed by opening the throttle valvequickly.

When engine is cold

[Engine coolant temperature : 20°C (68°F) or less]

Throttle valve

Normal vacuum condition

Open quickly

No vacuum will generate

(Remained as barometric pressure).

When engine is hot

[Engine coolant temperature : 20°C (68°F) or less]

Throttle valve	Normal vacuum condition
Open quickly	It will momentarily rise over 13 kPa (3.9 in.Hg)

Disconnect the three-way terminal.

Connect the hand vacuum pump directly to the EGR valve.

Check whether the engine stalls or the idling is unstable when a vacuum of 29 kPa (8.7 in.Hg) or higher is applied during idling.

VACUUM CONTROL VALVE CHECK

Disconnect the vacuum hose from the vacuum control valve and connect the hand vacuum pump to the vacuum control valve.

Put the blind plug to the removed vacuum hose.

Start the engine and run at idle.

Check the vacuum condition.

Engine condition	Normal vacuum condition
Idling	Approx. 23 kPa (6.7 in.Hg)

EGR VALVE

Remove the EGR valve and check for sticking, carbon deposits, etc. If such conditions exist, clean with solvent to ensure tight valve seat contact.

Connect a manual vacuum pump to the EGR valve.

Apply a vacuum of 67 kPa (9.7 psi) and check air tightness of diaphragm.

Blow in air from one passage of the EGR to check condition as follows.

Vacuum	Normal condition
7 kPa (1.0 psi) or less	Air does not blow through
23 kPa (3.3 psi) or more	Air blows through

note

When installing the EGR valve, use a new gasket and tighten to the specified torque.

Tightening torque

EGR valve :

19-28 Nm (190-280 kg·cm, 14-20 lb·ft)

EGR PORT VACUUM CHECK

Disconnect the vacuum hose from the throttle body EGR vacuum nipple and connect a hand vacuum pump to the nipple.

Start the engine and check to see that, after raising the engine speed by racing the engine, vacuum remains fairly constant.

EGR SOLENOID CHECK

note

When disconnecting the vacuum hose, always make a mark so that it can be reconnected at original position.

Disconnect the vacuum hose from the solenoid valve.

Disconnect the harness connector.

Connect a hand vacuum pump to the nipple to which the white-striped vacuum hose was connected.

Check airtightness by applying a vacuum with voltage applied directly from the battery to the EGR control solenoid valve and without applying voltage.

Battery voltage	Result
When applied	Vacuum is leak
When discontinued	Vacuum is maintained

Measure the resistance between the terminals of the solenoid valve.

Standard value : 62-74 W [at 20°C (68°F)]