Mazda 626 MX-6 Workshop Manual page 314

4B
EGR SYSTEM
4B—94
3. Disconnect the vacuum hose from the EGR con­
trol valve and connect the vacuum pump.
4. Turn the ignition switch ON.
5. Check voltage of each terminal in the conditions
shown in the table.
SST wire
Terminal
color
C Red
B Blue
A Black
6. If not correct at A and B terminal, check the wir­
ing harness and 2A and 2C terminals of the en­
gine control unit.
7. If not correct at C terminal, check the sensor re­
sistance, then the wiring harness and the engine
control unit 2F terminal.
8. Disconnect the SST and reconnect the EGR po­
sition sensor connector.
Inspection of resistance
1. Disconnect the EGR position sensor connector.
2. Check as shown resistance between the terminals
as shown.
Terminals
A - B
A - C
B -C
EGR Control Valve
1. Manually actuate the valve by pushing on the di­
aphragm with finger.
2. Check that the spring resistance is present and the
diaphragm moves freely with no sticking or
binding.
Note
Before replacing the EGR control valve, check
the intake air and control systems.
Revised 10/87
626, MX-6
Vacuum
0
120 mmHg (4.7 inHg)
0.25—0.95V Approx. 4.0V
Below 1,5V
4.5—5.5V
Resistance
5 kfl
0.7—5 kfl
0 .7 -5 kfl