Mazda 2: PCM
PCM REMOVAL/INSTALLATION
CAUTION:
1. Remove the air cleaner cover. (See INTAKE-AIR SYSTEM
REMOVAL/INSTALLATION).
2. Install in the reverse order of removal.
3. When replacing the PCM on the vehicles, perform the following:
- PCM configuration (See PCM CONFIGURATION).
- PCM parameter reset (See IMMOBILIZER SYSTEM-RELATED PARTS
PROGRAMMING [KEYLESS ENTRY SYSTEM] ).
PCM INSPECTION
Without Using the M-MDS
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.
PCM Terminal Voltage Table (Reference)










*1 ATX
*2 MTX
*3 With cruise control system
Inspection Using An Oscilloscope (Reference)
Fuel injection control signal

PCM terminals
- Fuel injector No.1: 2A (+)-Negative battery terminal (-)
- Fuel injector No.2: 2B (+)-Negative battery terminal (-)
- Fuel injector No.3: 2C (+)-Negative battery terminal (-)
- Fuel injector No.4: 2H (+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
CMP signal

PCM terminals
- 2N (+)-Negative battery terminal (-)
Oscilloscope setting
- 1 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
Evaporative purge control signal

PCM terminals
- 2S (+)-Negative battery terminal (-)
Oscilloscope setting
- 10 V/DIV (Y), 20 ms/DIV (X), DC range
Vehicle condition
Variable valve timing control signal

PCM terminals
- 2W (+)-Negative battery terminal (-)
Oscilloscope setting
- 10 V/DIV (Y), 10 ms/DIV (X), DC range
Vehicle condition
A/F sensor heater control signal

PCM terminals
- 2X (+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 50 ms/DIV (X), DC range
Vehicle condition
CKP signal

PCM terminals
- 2Y(+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 5 ms/DIV (X), DC range
Vehicle condition
Generator output voltage signal

PCM terminals
- 2AE (+)-Negative battery terminal (-)
Oscilloscope setting
- 2 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
Generator field coil control signal

PCM terminals
- 2AF (+)-Negative battery terminal (-)
Oscilloscope setting
- 0.5 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
ESA control signal

PCM terminals (except for California emission regulation applicable
model)
- Ignition coil No.1: 2AQ (+)-Negative battery terminal (-)
- Ignition coil No.2: 2AR (+)-Negative battery terminal (-)
- Ignition coil No.3: 2AU (+)-Negative battery terminal (-)
- Ignition coil No.4: 2AV (+)-Negative battery terminal (-)
Oscilloscope setting
- 0.5 V/DIV (Y), 40 ms/DIV (X), DC range
Vehicle condition
Throttle control (-) signal

PCM terminals
- 2BE (+)-Negative battery terminal (-)
Oscilloscope setting
- 10 V/DIV (Y), 1 ms/DIV (X), DC range
Vehicle condition
Throttle control (+) signal

PCM terminals
- 2BF (+)-Negative battery terminal (-)
Oscilloscope setting
- 5 V/DIV (Y), 0.4 ms/DIV (X), DC range
Vehicle condition
- Switch the ignition to ON.
Using The M-MDS
NOTE:
- PIDs for the following parts are not available on this model. Go to the
appropriate part inspection page.
- CMP sensor (See CAMSHAFT POSITION (CMP) SENSOR INSPECTION).
- Main relay (See RELAY INSPECTION).
1. Connect the M-MDS to the DLC-2.

2. Turn the ignition switch to the ON position.
3. Measure the PID value.
- If PID value is not within the specification, follow the instructions in
Action column.
NOTE:
- The PID/DATA MONITOR function monitors the calculated value of the
input/output signals in the PCM. Therefore,
an output device malfunction is not directly indicated as a malfunction of
the monitored value for the output
device. If a monitored value of an output device is out of specification,
inspect the monitored value of the input
device related to the output control.
- The simulation items that are used in the ENGINE CONTROL SYSTEM
OPERATION INSPECTION are as follows.
- ACCS, ALTF, ARPMDES, EVAPCP, EVAPCV, FAN1, FAN2, FP, IMRC, INJ_1,
INJ_2, INJ_3, INJ_4,
SEGRP, Test, VT Duty1 wt








*1 With cruise control system
*2 MTX
*3 ATX
PCM CONFIGURATION
1. Connect the M-MDS (IDS) to the DLC-2.
2. After the vehicle is identified, select the following items from the initial
screen of the M-MDS.
- When using the IDS (laptop PC)
- Select "Module Programming".
- Select "Programmable Module Installation".
- Select "PCM".
3. Perform the configuration according to the directions on the screen.
4. Retrieve DTCs by the M-MDS, then verify that there is no DTC present.
- If a DTC (s) is detected, perform the applicable DTC inspection. (See
DTC TABLE).
READ NEXT:
NEUTRAL SWITCH INSPECTION
1. Disconnect the negative battery cable.
2. Remove the neutral switch. (See NEUTRAL SWITCH REMOVAL/INSTALLATION).
3. Inspect for continuity between the neutral switch term
ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION
WARNING:
When the engine is hot, it can badly burn. Turn off the engine and wait
until it is cool
before removing the ECT sensor.
ECT
MASS AIR FLOW (MAF)/INTAKE AIR TEMPERATURE (IAT) SENSOR
REMOVAL/INSTALLATION
CAUTION:
Neither the MAF nor the IAT sensor cannot be removed as a single unit.
When
replacing the MAF or IAT sensor,
SEE MORE:
System Malfunction Location
Detection Condition
WARNING:
Detection conditions are for understanding the DTC outline before
performing an inspection. Performing an
inspection according to only the detection conditions may cause injury due
to an operating error, or damage
the system. When per
LUBRICATION SYSTEM LOCATION INDEX
Dipstick
(See ENGINE OIL LEVEL INSPECTION)
(See ENGINE OIL REPLACEMENT)
Oil pressure switch
(See OIL PRESSURE INSPECTION)
Oil filter
(See OIL FILTER REPLACEMENT)
Oil strainer
(See OIL PAN REMOVAL/INSTALLATION)
Oil pan
(See OIL PAN
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