Mazda 6 2002, Workshop Manual

Page: 165 / 1248

CONTROL SYSTEM
F–48–2
Without Using the SST
Caution
•
The PCM terminal voltages vary with change in measuring conditions and vehicle conditions.
Always carry out a total inspection of the input systems, output systems, and PCM to determine
the cause of trouble. Otherwise, a wrong diagnosis will be made.
1. Measure the voltage at each terminal.
•
If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s)
referring to the Action column in the terminal voltage table.
Terminal voltage table (Reference)
Terminal Signal Connected to Test condition
Voltage
(V)
Action
1A IGT1
Ignition coil (No. 1,
4 cylinders)
•
Inspect using the wave profile.
(See
F–48–10 Inspection Using An
Oscilloscope (Reference) .)
•
Inspect ignition coil
(See
G–9 IGNITION
COIL INSPECTION )
•
Inspect related
harness
1B IGT2
Ignition coil (No. 2,
3 cylinders)
•
Inspect using the wave profile.
(See
F–48–10 Inspection Using An
Oscilloscope (Reference) .)
•
Inspect ignition coil
(See
G–9 IGNITION
COIL INSPECTION )
•
Inspect related
harness
1C GND GND Under any condition Below 1.0
•
Inspect related
harness
1D GND GND Under any condition Below 1.0
•
Inspect related
harness
1E — — — — —
1F — — — — —
1G
Atmospheric
pressure
BARO sensor
Ignition switch ON (Engine OFF
at sea level) Approx.
4.0
•
Inspect BARO sensor
(See
F–60
BAROMETRIC
PRESSURE (BARO)
SENSOR
INSPECTION
)
•
Inspect related
harness
Ignition switch OFF Below 1.0
1H — — — — —
1I — — — — —
1J
Manifold absolute
pressure
MAP sensor
Ignition switch ON (Engine OFF
at sea level) Approx.
4.1
•
Inspect MAP sensor
(See
F–52
MANIFOLD
ABSOLUTE
PRESSURE (MAP)
SENSOR
INSPECTION
)
•
Inspect related
harness
Idle (at sea level)
Approx.
1.5
1K Brake Brake switch
Brake pedal depressed B+
•
Inspect brake switch
•
Inspect related
harness
Brake pedal released Below 1.0
1L — — — — —
1B
1A
1E
1D
1C
1H
1G 1J
1F 1I
1M
1L
1N 1K 1T 1Q
1P 1S
1O 1R
1W
1V
1Z
1Y
1X
1AC
1AB
1AA 1AD
1U
2B
2A
2E
2D
2C
2H
2G 2J
2F 2I
2M
2L
2N 2K 2T 2Q
2P 2S
2O 2R
2W
2V
2Z
2Y
2X
2AC
2AB
2AA
2AD
2U
3B
3A
3E
3D
3C
3H
3G 3J
3F 3I
3M
3L
3N 3K 3T 3Q
3P 3S
3O 3R
3W
3V
3Z
3Y
3X
3AA
3U
4B
4A
4E
4D
4C
4H
4G 4J
4F 4I
4M
4L
4N 4K 4T 4Q
4P 4S
4O 4R
4W
4V
4Z
4Y
4X
4AC
4AB
4AA 4AD
4U
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