Without Using the SST

NOTE:

The PCM terminal voltage can vary with the conditions when measuring and changes due to aged deterioration on the vehicle, causing false diagnosis. Therefore determine comprehensively where the malfunction occurs among the input systems, output systems, and the PCM.

Fig 1: PCM Connector Terminal Identification
Courtesy of MAZDA MOTORS CORP.

PCM CONNECTOR TERMINALS REFERENCE CHART

Terminal

Signal

Connected to

Test condition

Voltage (V)

Inspection item

1A⁽²⁾

Battery voltage

Main relay

Ignition switch off.

1.0 or less

Main relay
Battery
Related wiring harness

1B⁽²⁾

Shift solenoid A

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Shift solenoid A
Related wiring harness

1C⁽²⁾

Shift solenoid B

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Shift solenoid B
Related wiring harness

1D⁽²⁾

Shift solenoid C

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Shift solenoid C
Related wiring harness

1E⁽²⁾

Shift solenoid D

During TCC operation

B+

Shift solenoid D
Related wiring harness

Except above

1.0 or less

1F⁽²⁾

Shift solenoid E

During TCC operation

B+

Shift solenoid E
Related wiring harness

Except above

1.0 or less

1G⁽²⁾

Pressure control solenoid (+)

Pressure control solenoid

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Pressure control solenoid
Related wiring harness

1H⁽²⁾

Pressure control solenoid (-)

Pressure control solenoid

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Pressure control solenoid
Related wiring harness

1J⁽²⁾

Vehicle speed

VSS

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

VSS
Related wiring harness

1K⁽²⁾

Manual up

Up switch

Ignition switch is turned to the ON position.

Detects up-shift operation of selector lever in M range

1.0 or less

Selector lever
Related wiring harness

Others

B+

1L⁽²⁾

Oil pressure switch

Oil pressure switch OFF

B+

Oil pressure switch
Related wiring harnesses

Oil pressure switch ON

1.0 or less

1M⁽²⁾

Input/turbine speed sensor(+)

Input/turbine speed sensor

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Input/turbine speed sensor
Related wiring harness

Clutch operation⁽¹⁾

CPP switch

Clutch pedal depressed

Below 1.0

CPP
Related wiring harness

Clutch pedal released

B+

M range switch⁽²⁾

M range switch

Ignition switch is turned to the ON position.

M range

1.0 or less

Selector lever
Related wiring harness

Except above

B+

1P⁽²⁾

Manual down

Down switch

Ignition switch is turned to the ON position.

Detects downshift operation of selector lever in M range

1.0 or less

Selector lever
Related wiring harness

Others

B+

1Q⁽²⁾

Input/turbine speed sensor (-)

Input/turbine speed sensor

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Input/turbine speed sensor
Related wiring harness

Refrigerant pressure switch (medium)

A/C ON

Refrigerant pressure is above 1.52 MPa{15.5 kgf/cm² , 220 psi}

Below 1.0

Refrigerant pressure switch
Related wiring harness

Refrigerant pressure is below 1.23 M Pa {12.5 kgf/cm² , 178 psi}

B+

Neutral position⁽¹⁾

Neutral switch

Ignition switch is turned to the ON position

Shift lever is at neutral position

Below 1.0

Neutral switch
Related wiring harness

Shift lever is not at neutral position

B+

Selector lever position⁽²⁾

TR switch

Ignition switch is turned to the ON position

P position

Approx. 4.6

TR switch
Related wiring harness

R position

Approx. 3.9

N position

Approx. 3.2

D range

Approx. 2.5

M range

Approx. 2.5

1U⁽²⁾

ATF temperature

TFT sensor

Ignition switch is turned to the ON position.

TFT is 20 °C {68 °F}

Approx. 3.3

TFT sensor
Related wiring harness

TFT is 40 °C {104 °F}

Approx. 2.4

TFT is 60 °C {140 °F}

Approx. 1.5

Cooling fan control

Fan control module

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Fan control module.
Related wiring harness

APP sensor 1

APP sensor

Ignition switch to the ON position

When the accelerator pedal is depressed

Approx. 3.0

APP sensor
Related wiring harness

When the accelerator pedal is released

Approx. 0.4

1AA

Sensor ground

MAF/IAT sensor, BARO sensor

Under any condition

Below 1.0

Related wiring harness

1AB

Starter relay control

Starter relay

Under any condition

Below 1.0

Starter relay
Related wiring harness

1AC

MAF

MAF sensor

Ignition switch to the ON position

Approx. 0.7

MAF sensor
Related wiring harness

Idle (after warm up)

Approx. 1.3

1AD

Cruise control switch

Ignition switch to the ON position

ON/OFF switch pressed in

Approx. 0

Cruise control switch
Related wiring harnesses

CANCEL switch pressed in

Approx. 1.1

SET/COAST switch pressed in

Approx. 3.1

RES/ACCEL switch pressed in

Approx. 4.2

Except above

Approx. 5

1AE

Constant voltage (VREF)

BARO sensor APP sensor

Ignition switch to the ON position

Approx. 5.0

Related wiring harness

1AF

EVAP leak detection pump (pump)

EVAP leak detection pump

Ignition switch to the ON position

B+

EVAP leak detection pump
Related wiring harnesses

Idling

B+

1AG

1AH

IAT

MAF/IAT sensor

Ignition switch to the ON position

IAT 0 °C {32 °F}

Approx. 3.43

IAT sensor
Related wiring harness

IAT 20 °C {68 °F}

Approx. 2.38

IAT 40 °C {104 °F}

Approx. 1.49

IAT 60 °C {140 °F}

Approx. 0.89

1AI

CAN (L)

Instrument cluster, ABS HU/CM, EHPAS control module

Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.

Related wiring harness

1AJ

EVAP leak detection pump (solenoid)

EVAP leak detection pump

Ignition switch to the ON position

B+

EVAP leak detection pump
Related wiring harnesses

Idling

B+

1AK

1AL

APP sensor 2

APP sensor

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

APP sensor
Related wiring harness

1AM

CAN (H)

Instrument cluster, ABS HU/CM, EHPAS control module

Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.

Related wiring harness

1AN

A/C

A/C relay

idle (after warm up)

A/C operating

Below 1.0

A/C relay
Related wiring harness

A/C not operating

B+

1AO

1AP

A/C on signal

Refrigerant pressure switch (high and low)

idle (after warm up)

A/C switch and fan switch on

Below 1.0

Refrigerant pressure switch
Related wiring harness

1AQ

1AR

Fuel pump control

Fuel pump relay

Ignition switch to the ON position after 1 s

B+

Fuel pump relay
Related wiring harness

Cranking

Below 1.0

idle (after warm up)

Below 1.0

1AS

1AT

Main relay control

Main relay

Ignition switch off after 9 s

B+

Main relay
Related wiring harness

Ignition switch to the ON position

Below 1.0

1AU

Brake

Brake switch

Brake pedal depressed

B+

Brake switch
Related wiring harness

Brake pedal released

Below 1.0

1AV

Internal ground

Input/turbine speed sensor shield wire

Under any condition

1.0 or less

Related wiring harness

1AW

1AX

Ignition switch

Ignition switch off

Below 1.0

Related wiring harness

Ignition switch to the ON position

B+

1AY

Drive-by-wire relay

Ignition switch off

B+

Related wiring harness

Ignition switch to the ON position

Below 1.0

1AZ

GND

Under any condition

Below 1.0

Related wiring harness

1BA

Back-up power supply

Battery (positive terminal)

Under any condition

B+

Battery
Related wiring harness

1BB

GND

Under any condition

Below 1.0

Related wiring harness

1BC

1BD

GND

Under any condition

Below 1.0

Related wiring harness

1BE

B+

Main relay

Ignition switch off after 9 s

Below 1.0

Battery
Related wiring harness

Ignition switch to the ON position

B+

1BF

Drive-by-wire relay

Ignition switch off after 9 s

Below 1.0

Related wiring harness

Ignition switch to the ON position

B+

1BG

1BH

GND

Under any condition

Below 1.0

Related wiring harness

Throttle actuator control (+)

Throttle actuator

Ignition switch to the ON position

B+

Throttle actuator
Related wiring harness

Throttle actuator control (-)

Throttle actuator

Idle (after warm up)

Approx. 3.5-5.5

Throttle actuator
Related wiring harness

Rear HO2S heater control

HO2S (Rear) heater

Idle (after warm up)

Below 1.0

HO2S (Rear) heater.
Related wiring harness

Engine speed above 4,000 RPM

B+

Front HO2S heater control

HO2S (Front) heater

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

HO2S (Front) heater.
Related wiring harness

TP (No. 2)

TP sensor No. 2

Ignition switch to the ON position

CTP

4.00-4.47

TP sensor
Related wiring harness

WOT

0.25-0.75

Constant voltage (VREF)

TP sensor

Ignition switch to the ON position

Approx. 5.0

TP sensor
Related wiring harness

TP (No. 1)

TP sensor No. 1

Ignition switch to the ON position

CTP

0.53-1.00

TP sensor
Related wiring harness

WOT

4.25-4.75

TP sensor ground

TP sensor

Under any condition

Below 1.0

TP sensor
Related wiring harness

Internal ground

KS, CMP sensor, CKP sensor, HO2S (Front, rear)

Under any condition

1.0 or less

Related wiring harness

Knocking (+)

Ignition switch to the ON position (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter)

Approx. 4.3

KS
Related wiring harness

Knocking (-)

Ignition switch to the ON position (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter)

Below 1.0

KS
Related wiring harness

CMP (+)

CMP sensor

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

CMP sensor
Related wiring harness

CMP (-)

CMP sensor

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

CMP sensor
Related wiring harness

Constant voltage (VREF)

MAP sensor

Ignition switch to the ON position

Approx. 5.0

Related wiring harness

CKP (+)

CKP sensor

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

CKP sensor
Related wiring harness

CKP (-)

CKP sensor

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

CKP sensor
Related wiring harness

2AA

Sensor ground

HO2S (Front, Rear), ECT sensor, MAP sensor

Under any condition

Below 1.0

Related wiring harness

2AB

2AC

2AD

2AE

Variable tumble shutter valve monitor

Variable tumble shutter valve switch

ECT above 63 °C {145 °F} while idling.

B+

Variable tumble shutter valve switch
Related wiring harness

ECT below 63 °C {145 °F} and engine speed below 3,750 RPM

Below 1.0

2AF

OCV control

OCV

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

OCV valve
Related wiring harness

2AG

Front HO2S

HO2S (front)

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

HO2S (front)
Related wiring harness

2AH

Rear HO2S

HO2S (rear)

Ignition switch to the ON position

Approx. 0

HO2S(rear)
Related wiring harness

Idle (after warm up)

Alternates between 0 and 1.0

2AI

Variable tumble control

Variable tumble solenoid valve

ECT above 63 °C {145 °F} while idling.

B+

Variable tumble solenoid valve
Related wiring harness

ECT below 63 °C {145 °F} and engine speed below 3,750 RPM

Below 1.0

2AJ

Variable intake air control

Variable intake air solenoid valve

Ignition switch to the ON position

Below 1.0

Variable intake air solenoid valve
Related wiring harness

Engine speed: below 4,600 RPM

Below 1.0

Engine speed: above 4,600 RPM

B+

2AK

ECT

ECT sensor

Ignition switch to the ON position

IAT 20 °C {68 °F}

3.04-3.14

ECT sensor
Related wiring harness

IAT 40 °C {104 °F}

2.09-2.21

IAT 60 °C {140 °F}

1.29-1.39

IAT 80 °C {176 °F}

0.76-0.83

IAT 100 °C {212 °F}

0.45-0.49

2AL

Manifold absolute pressure

MAP sensor

Ignition switch to the ON position (at sea level)

Approx. 4.1

MAP sensor
Related wiring harness

idle (after warm up)

Approx. 1.2

2AM

Generator output voltage

Generator (terminal P)

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Generator
Related wiring harness

2AN

Purge control

Purge solenoid valve

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Purge solenoid valve
Related wiring harness

2AO

2AP

2AQ

Generator field coil control

Generator (terminal D)

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Following PIDs: IAT, ECT, RPM, VPWR, ALTT V.
Generator
Related wiring harness

2AR

EGR valve #2 coil control

EGR valve (terminal A)

Ignition switch to the ON position

B+

EGR valve
Related wiring harness

idle (after warm up)

B+

2AS

2AT

2AU

EGR valve #1 coil control

EGR valve (terminal E)

Ignition switch to the ON position

Below 1.0

EGR valve
Related wiring harness

idle (after warm up)

Below 1.0

2AV

EGR valve #4 coil control

EGR valve (terminal F)

Ignition switch to the ON position

Below 1.0

EGR valve
Related wiring harness

idle (after warm up)

Below 1.0

2AW

2AX

2AY

EGR valve #3 coil control

EGR valve (terminal B)

Ignition switch to the ON position

B+

EGR valve
Related wiring harness

idle (after warm up)

B+

2AZ

Fuel injection (#4)

Fuel injector No.4

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Fuel injector No.4
Related wiring harness

2BA

2BB

Fuel injection (#1)

Fuel injector No.1

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Fuel injector No.1
Related wiring harness

2BC

Fuel injection (#2)

Fuel injector No.2

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Fuel injector No.2
Related wiring harness

2BD

Fuel injection (#3)

Fuel injector No.3

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Fuel injector No.3
Related wiring harness

2BE

IGT1

Ignition coil (No.1 cylinders)

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Ignition coil
Related wiring harness

2BF

IGT2

Ignition coil (No.2 cylinders)

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Ignition coil
Related wiring harness

2BG

IGT3

Ignition coil (No.3 cylinders)

Inspect using the wave profile. (See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Ignition coil
Related wiring harness

2BH

IGT4

Ignition coil (No.4 cylinders)

Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) ).

Ignition coil
Related wiring harness

⁽¹⁾

MTX

⁽²⁾

ATX