Egr Valve Inspection; Egr Valve Replacement - Mazda B-Series 1997 Workshop Manual

EXHAUST GAS RECIRCULATION (EGR) FUNCTION CONTROL. SYSTEM
(FOR 2 . 3 ~
1
3 . o ~ 1 4 . 0 ~ )
FT
5. Apply the battery voltage to the terminal A and ground the
terminal B as shown.
Caution
Never apply the battery voltage to the terminal B.
The diode in solenoid may be damaged.
MF2037-A 5BUOF1-189
6. Apply the vacuum and make sure that the needle of the
vacuum pump jumps up and returns to zero.
7.
If not as specified, replace the solenoid.
EGR VALVE
Inspection
~ ~ 1 5 3 5 - A ~HUOFI-190
1.
Install a tachometer.
2. Disconnect the idle air control solenoid connector.
3.
Remove and plug the vacuum supply hose from the EGR
valve.
4. Start the engine and run it at idle with the transmission in
neutral.
5. Observe the idle speed.
6.
Connect a vacuum pump to the EGR valve and slowly
apply vacuum.
Specification:
17-34 kPa {I 27-254 mmHg, 5-1 0 inHg}
7.
Verify that the idle speed drops more than 100 rpm with
vacuum applied and returns to normal
{ * 25 rpm)
after
the vacuum is removed.
8.
If not as specified, replace the EGR valve.
4BUOF3-170
Replacement
1. Remove the EGR valve in the sequence shown below:
(1) Remove DPFE sensor retaining bolt (4.OL only)
(2) Reposition DPFE sensor (4.OL o111y)
(3)
EGR tubes
(4) Vacuum hose
(5) EGR valve and gasket
Note
Before installing the EGR valve, install new gasket.
2.
Install the
EGR
valve in the reverse order of removal.
Tightening torques:
EGR valv to tube nuts: 3 4 4 8 N.m
( 3 . 5 4 . 8 kgf
.
m, 25-35
ft
-
Ibf)
EGR valve to manifold: 20-30 N 0 m
(2.1-3.1 kgfem, 15-22 ft-lbf)
6BUOFT-217