Mazda MX-6 1998, Workshop Manual

Page: 529 / 1282

CONTROL SYSTEM [FS]
7. If not as specified, perform the following
inspection.
fT r _o □_
HARNESS SIDE CONNECTOR
(VIEW FROM VEHICLE HARNESS CONNECTOR)
W6U140WAT
(1) Harness continuity
• Between PCM terminal 34 and EGR boost
sensor terminal A
• Between PCM terminal 91 and EGR boost
sensor terminal B
• Between PCM terminal 90 and EGR boost
sensor terminal C
(2) If there is no continuity, repair or replace
related harness.
(3) Terminal voltage (Ignition switch ON)
• EGR boost sensor terminal B voltage: Ground
(Below 1.0 V)
• EGR boost sensor terminal C voltage:
Constant voltage (4.5— 5.5 V)
(4) If terminal voltage is incorrect, check the
PCM.
8. If terminal voltage is correct and if there is
harness continuity, replace the EGR boost sensor.
FUEL TANK PRESSURE SENSOR INSPECTION [FS]
Using the SST (104 Pin Breakout Box)
Note
• The following vacuum values are indicated by
relative pressure from atmospheric pressure.
1. Remove the PCM. (Refer to 01-40A
POWERTRAIN CONTROL MODULE (PCM)
REMOVAL/INSTALLATION [FS].)
2. Connect the SST (104 Pin Breakout Box) to the
PCM as shown.
W 6 U 1 4 0 W A U
3. Tighten the connector bolt.
Tightening torque
7.9— 10.7 N m
{80— 100 kgf cm, 69.5— 95.4 in lbf}
Caution
• Do not apply a vacuum outside of the
specified limits. Doing so will damage the
fuel tank pressure sensor.
4. Turn the ignition switch to ON.
5. Apply pressure then a vacuum to the fuel tank
pressure sensor according to the following
procedure.
Note
• The output voltage varies with the measuring
condition.
6. Decrease the applied pressure from +6.66 kPa
{+50 mmHg, +1.97 inHg} to -6 .6 6 kPa {-5 0
mmHg, -1 .9 7 inHg} and verify that the PCM
terminal 62 voltage decreases accordingly as
specified.
Specification
A p p lie d vacuum
O u tp u t v o lta g e (V)*
-6 .6 6 kPa
{-5 0 mmHg, -1 .9 7 inHg}
0.45— 0.55
0 kPa {0 mmHg, 0 inHg}
2.25— 2.75
+6.66 kPa
{+50 mmHg, +1.97 inHg}
4.05— 4.95
' : Measuring condition is following.
• Input voltage:
5.0
V
• Atmospheric pressure: 101.3 kPa {760 mmHg, 29.9 inHg}
(Absolute pressure)
• Atmospheric temperature: 30— 100 °C {0— 182 °F}
7. If not as specified, perform the following
Inspection.
PRESSUREA/ACUUM
FUEL TANK SENSOR
W 6 U 1 4 0 W 1 6
HARNESS
0 1 -4 0 A -2 4