Mazda 2002 6 Workshop Manual page 165

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)
4Y 4S 4P 4M 4J 4G
4V
4AB
4Z 4T 4Q 4N 4K 4H
4W
4AC
4U 4R 4O 4L 4I
4X
4AD 4AA
Terminal Signal
1A IGT1
1B IGT2
1C GND
1D GND
1E —
1F —
Atmospheric
1G
pressure
1H —
1I —
Manifold absolute
1J
pressure
1K Brake
1L —
F–48–2
CONTROL SYSTEM
4D 4A 3Y 3V 3S 3P 3M 3J 3G
4E 4B 3Z 3W 3T 3Q 3N 3K 3H
4F 4C 3X 3U 3R 3O 3L 3I
3AA
Connected to
Ignition coil (No. 1,
4 cylinders)
Ignition coil (No. 2,
3 cylinders)
GND
GND
—
—
BARO sensor
—
—
MAP sensor
Brake switch
—
2Y 2V 2S 2P 2M
3D 3A 2AB
2Z 2W 2T 2Q 2N 2K
3E 3B 2AC
2X 2U 2R 2O
3F 3C 2AD
2AA
Test condition
• Inspect using the wave profile.
(See F–48–10 Inspection Using An
Oscilloscope (Reference).)
• Inspect using the wave profile.
(See F–48–10 Inspection Using An
Oscilloscope (Reference).)
Under any condition
Under any condition
—
—
Ignition switch ON (Engine OFF
at sea level)
Ignition switch OFF
—
—
Ignition switch ON (Engine OFF
at sea level)
Idle (at sea level)
Brake pedal depressed
Brake pedal released
—
2J 2G 2D 2A 1Y 1S
1AB 1V
2H 2E 2B 1Z 1T 1Q
1W
1AC
2L 2I 2F 2C 1U
1AD 1X
1AA
Voltage
(V)
• Inspect ignition coil
(See
COIL
• Inspect related
harness
• Inspect ignition coil
(See
COIL
• Inspect related
harness
• Inspect related
Below 1.0
harness
• Inspect related
Below 1.0
harness
—
—
• Inspect BARO sensor
Approx.
4.0 (See
BAROMETRIC
PRESSURE (BARO)
SENSOR
Below 1.0
INSPECTION)
• Inspect related
harness
—
—
• Inspect MAP sensor
Approx.
4.1 (See
MANIFOLD
ABSOLUTE
PRESSURE (MAP)
Approx.
SENSOR
1.5
INSPECTION)
• Inspect related
harness
• Inspect brake switch
B+
• Inspect related
Below 1.0
harness
—
1P 1M 1J 1G 1D 1A
1N 1K 1H 1E 1B
1R 1O 1L 1I 1F 1C
A6A3940W002
Action
G–9 IGNITION
INSPECTION)
G–9 IGNITION
INSPECTION)
—
—
F–60
—
—
F–52
—