Mazda MX-6 1998, Workshop Manual

Page: 551 / 1282

CONTROL SYSTEM [KL]
MASS AIR FLOW SENSOR INSPECTION [KL]
Using the SST (104 Pin Breakout Box)
1. Check the mass air flow sensor for damage and
cracks.
2. Remove the PCM. (Refer to 01-40B
POWERTRAIN CONTROL MODULE (PCM)
REMOVAL/INSTALLATION [KL].)
3. Connect the SST (104 Pin Breakout Box) to the
PCM as shown.
4. Tighten the connector bolt.
Tightening torque
7.9— 10.7 N m
(80— 110 kgf-m, 69.5— 95.4 in lbf}
5. Measure the voltage at the PCM terminal 88 as
shown in the table.
Specification
Measuring condition Voltage (V)
Ignition switch ON Below 1.0
Idle
1.0— 2.0
6. If not as specified, inspect the following.
(1) Harness continuity
• Between PCM terminal 88 and mass air flow
sensor terminal E
• Between PCM terminal
36
and mass air flow
sensor terminal D
• Between PCM terminal
76
and mass air flow
sensor terminal C
• Between main relay terminal E and mass air
flow sensor terminal B
(2)
Terminal voltage
• Mass air flow sensor terminal
B
voltage:
Battery positive voltage
• Mass air flow sensor terminal C voltage:
Below 1.0 V
W6U140W0D
7. If the terminal voltage is correct and there is
harness continuity, replace the mass air flow
sensor. (Refer to 01-13B INTAKE-AIR SYSTEM
REMOVAL/INSTALLATION [KL].)
Using the SST (NGS Tester)
1. Check the mass air flow sensor for damage and
cracks.
2. Connect the SSTs (NGS tester) to the data link
connector.
3. Turn the ignition switch to ON.
4. Select the “PID/DATA MONITOR AND RECORD’
function on the NGS tester display and press
TRIGGER.
5. Select “MAF V” on the NGS tester display and
press START. The NGS tester measures and
show the voltage.
Specification
Measuring condition Voltage (V)
Ignition switch ON Below 1.0
Idle 1.0— 2.0
6. If not as specified, inspect the following.
(1)
Harness continuity
• Between PCM terminal 88 and mass air flow
sensor terminal E
• Between PCM terminal
36
and mass air flow
sensor terminal D
• Between PCM terminal
76
and mass air flow
sensor terminal C
• Between main relay terminal E and mass air
flow sensor terminal B
(2) Terminal voltage
• Mass air flow sensor terminal B voltage:
Battery positive voltage
• Mass air flow sensor terminal C voltage:
Below
1.0
V
0 1 -4 0 B -1 6