Mazda Mazda6 Workshop Manual Supplement page 125

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 4D
4AB 4V
4Z 4T 4Q 4N 4K 4H 4E
4AC 4W
4X 4U 4R 4O 4L 4I 4F
4AD
4AA
Terminal Signal
1A IGT1
1B IGT2
1C GND
1D GND
1E —
1F —
1G BARO
1H —
1I —
Manifold absolute
1J
pressure
1K Brake
1L —
1M ECT
1N —
1O —
1P MAF
CONTROL SYSTEM
4A 3Y 3V 3S 3P 3M 3J 3G 3D
4B 3Z 3W 3T 3Q 3N 3K 3H 3E
4C 3X 3U 3R 3O 3L 3I 3F
3AA
Connected to
• Inspect using the wave profile.
Ignition coil (No. 1,
4 cylinders)
• Inspect using the wave profile.
Ignition coil (No. 2,
3 cylinders)
GND Under any condition
GND Under any condition
—
—
BARO sensor Ignition switch ON (at sea level)
—
—
Ignition switch ON (Engine OFF)
MAP sensor
Idle
Brake pedal depressed
Brake switch
Brake pedal released
—
Ignition switch
ECT sensor
ON
—
—
Ignition switch ON
MAF sensor
Idle (after warm up)
2Y 2V 2S 2P 2M 2J 2G
3A 2AB
2Z 2W 2T 2Q 2N 2K 2H
3B 2AC
2X 2U 2R 2O 2L 2I
3C 2AD 2AA
Test condition
(See F1–44 Inspection Using An
Oscilloscope (Reference).)
(See F1–44 Inspection Using An
Oscilloscope (Reference).)
—
—
—
—
—
ECT 20 °C
{68 °F}
ECT 60 °C
{140 °F}
—
—
2D 2A 1Y 1S 1P 1M 1J
1AB 1V
2E 2B 1Z 1T 1Q 1N 1K
1AC 1W
2F 2C 1X 1U 1R 1O 1L
1AD
1AA
Voltage
Action
(V)
• Inspect ignition coil
• Inspect related
harness
• Inspect ignition coil
• Inspect related
harness
• Inspect related
Below 1.0
harness
• Inspect related
Below 1.0
harness
— —
— —
• Inspect BARO sensor
Approx.
• Inspect related
4.1 V
harness
— —
— —
Approx.
• Inspect MAP sensor
4.1
• Inspect related
Approx.
harness
1.5
• Inspect brake switch
B+
• Inspect related
Below 1.0
harness
— —
3.04—
• Inspect ECT sensor
3.14
• Inspect related
1.29—
harness
1.39
— —
— —
Approx.
• Inspect MAF sensor
0.7
• Inspect related
Approx.
harness
1.3
F1
1G 1D 1A
1H 1E 1B
1I 1F 1C
A6A3940W002
F1–37