Mazda 2: PCM
PCM INSPECTION
CAUTION:
- Water or foreign objects entering the connector can cause a poor
connection or
corrosion. Be sure not to drop water or foreign objects on the connector
when
disconnecting it.
NOTE:
- The PCM terminal voltage can vary with conditions when measuring and
changes due to
age deterioration on the vehicle, causing false diagnosis. Therefore a
comprehensive
inspection of the input and output systems, and the PCM is necessary to
determine
where the malfunction occurs.
1. Remove the PCM connector cover. (See PCM REMOVAL/INSTALLATION).
2. Connect the voltmeter (-) lead to body GND.
3. 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 "Inspection Item" column in the
"PCM Terminal Voltage".
PCM Terminal Voltage (Reference)
NOTE:
- Only the transaxle-related information is described.




Input/Output Wave From (Reference)
Shift solenoid A

PCM terminals
- 1D (+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
Shift solenoid B

PCM terminals
- 1H (+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
Shift solenoid C

PCM terminals
- 1L (+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
Pressure control solenoid (+)

PCM terminals
- 1P (+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle at P position after warm-up
Pressure control solenoid (-)

PCM terminals
- 1T (+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
- Idle at P position after warm-up
Input/turbine speed sensor

PCM terminals
Oscilloscope setting
- 1 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- Idle at P position after warm-up
VSS

PCM terminals
- 1AX (+)-Negative battery terminal (-)
Oscilloscope setting
- 1 V/DIV (Y), 2 ms/DIV (X), DC range
Vehicle condition
- The following conditions are met:
- Vehicle speed: 30 km/h {19 mph}
- Gear position: 3GR
PCM REMOVAL/INSTALLATION
1. Remove and install the PCM. (See PCM REMOVAL/INSTALLATION).
AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION
CAUTION:
- Secure the steering wheel using tape or a cable to prevent the steering
shaft from rotating after disconnecting the steering
shaft. If the steering wheel rotates after the steering shaft and the
steering gear and linkage are disconnected, the internal
parts of the clock spring could be damaged.
1. Disconnect the negative battery cable.
2. Drain the ATF into a separate suitable container. (See AUTOMATIC TRANSAXLE
FLUID (ATF) REPLACEMENT).
3. Disconnect and/or remove the following parts.
- Remove the battery, battery tray. (See BATTERY REMOVAL/INSTALLATION).
- Remove the battery tray bracket. (See ENGINE REMOVAL/INSTALLATION).
- Remove the fresh-air duct and air cleaner component as a single unit.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION).
- Disconnect the selector cable from the transaxle. (See AUTOMATIC
TRANSAXLE SHIFT MECHANISM
REMOVAL/INSTALLATION).
- Disconnect the connector and GND wiring harness from the transaxle.
- Remove the EGR pipe installation bolt. (See EGR PIPE
REMOVAL/INSTALLATION).
- Remove the bracket from the transaxle.
- Disconnect the oil hose from the transaxle. (See OIL COOLER
REMOVAL/INSTALLATION).
- Disconnect the oil hose clip from the No.4 engine mount bracket. (See
OIL COOLER REMOVAL/INSTALLATION).
- Remove the water-cooled oil cooler from the transaxle with the hose
connected. (See OIL COOLER REMOVAL/INSTALLATION).
- Remove the filler tube from the transaxle.
- Remove the starter. (See STARTER REMOVAL/INSTALLATION).
4. Disconnect and/or remove the following parts.
- Remove the front tires. (See GENERAL PROCEDURES (FRONT AND REAR AXLES)
).
- Disconnect the ABS wheel-speed sensors from the steering knuckles. (See
FRONT ABS WHEEL-SPEED SENSOR
REMOVAL/INSTALLATION).
- Remove the clip, then unlock the brake pipe. (vehicle left side) (See
BRAKE HOSE (FRONT)
REMOVAL/INSTALLATION).
- Disconnect the tie-rod end ball joints from the steering knuckles. (See
FRONT CROSSMEMBER
REMOVAL/INSTALLATION).
- Disconnect the front lower arm ball joint from the steering knuckles.
(See FRONT LOWER ARM
REMOVAL/INSTALLATION).
- Disconnect the stabilizer control links from the front shock absorbers.
(See FRONT SHOCK ABSORBER AND COIL
SPRING REMOVAL/INSTALLATION).
- Disconnect the drive shaft from the transaxle. (See DRIVE SHAFT
REMOVAL/INSTALLATION).
- Remove the joint shaft. (See JOINT SHAFT REMOVAL/INSTALLATION).
5. Install the SST (49 C017 5A0, 49 UN30 3050) using the following procedure.
CAUTION:
- Refer to the SST instruction manual for the basic handing procedure.
- Set the bracket and vacuum pipe out of the way to prevent interference
with the SST as shown in the figure.

CAUTION:
- When attaching the SST in the engine rear side, install a suitable nut
between the engine and the
SST.
- Using the bolts part number 99794 1025 or M10
READ NEXT:
DRIVE PLATE REMOVAL/INSTALLATION
1. Remove the transaxle. (See AUTOMATIC TRANSAXLE REMOVAL/INSTALLATION).
2. Remove in the order indicated in the table.
3. Install in the reverse order of removal.
OIL SEAL REPLACEMENT
CAUTION:
The oil seal is easily damaged by the sharp edges of the drive shaft
splines. Do not let
the splines contact the oil seal.
1. Drain the ATF into a separate suitable
CONTROL VALVE BODY REMOVAL/INSTALLATION
On-Vehicle Removal
WARNING:
Using compressed air can cause dirt and other particles to fly out,
causing injury to the
eyes. Wear protective eyeglasses when
SEE MORE:
CONVENTIONAL BRAKE SYSTEM LOCATION INDEX
Vacuum line
(See VACUUM LINE INSPECTION.)
(See VACUUM HOSE REMOVAL/INSTALLATION.)
Brake fluid
(See BRAKE FLUID INSPECTION.)
(See BRAKE FLUID AIR BLEEDING.)
Power brake unit
(See POWER BRAKE UNIT INSPECTION.)
(See POWER BRAKE UNIT REM
The emergency fl at tyre repair kit included
with your Mazda is for a temporary repair
of a slightly damaged fl at tyre resulting
from running over nails or similar sharp
objects on the road surface.
Perform the emergency fl at tyre repair
without removing the nail or similar sharp
object w
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