PCM Inspection Using the SST (104 Pin Breakout Box)

Disconnect the negative battery cable.
Disconnect the PCM connector.
Connect the SST (104 Pin Breakout Box) to the PCM as shown.

Fig 1: Connecting 104 Pin Breakout Box
Courtesy of MAZDA MOTORS CORP.
Tighten the connector attaching bolt.
Tightening torque
1. 3.0-5.4 N.m {30-56 kgf.cm, 27-48 in.lbf}
Connect the negative battery cable.
Measure the voltage at each terminal.
- If any incorrect voltage is detected, inspect the related systems, wiring harnesses and connectors referring to the Action column in the terminal voltage table.

Terminal voltage table (Reference)

TERMINAL VOLTAGE

Terminal

Signal

Connected to

Test condition

Voltage (V)

Inspection item

CKP-

CKP sensor

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

CKP sensor
Related wiring harness

CMP-

CMP sensor

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

CMP sensor
Related wiring harness

Knocking

Knock sensor (-)

IG SW ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter)

Below 1.0

Knock sensor
Related wiring harness

Ignition switch

IG SW ON

B+

Ignition switch
Related wiring harness

IG SW OFF

Below 0.1

A/C

A/C switch

Idle

A/C switch and fan switch ON

Below 1.0

A/C switch
Related wiring harness

A/C switch OFF

B+

GND

Under any condition

Below 1.0

Related wiring harness

IAT ground

MAF/IAT sensor

Under any condition

Below 1.0

MAF sensor
Related wiring harness

MAF

MAF sensor

IG SW ON

0-0.1

MAF sensor
Related wiring harness

Idle

0.5-0.8

Fuel tank level

Fuel gauge sender unit

Full fuel

1.0-1.5

Fuel gauge sender unit
Related wiring harness

Half fuel

2.8-3.4

Empty fuel

4.4-4.8

IAT

MAF/IAT sensor

IG SW ON

IAT 20 °C {68 °F}

2.3-2.5

IAT sensor
Related wiring harness

IAT 30 °C {86 °F}

1.8-2.0

HO2S (Front, RH)

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

HO2S (Front; RH)
Related wiring harness

HO2S (Front, LH)

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

HO2S (Front, LH)
Related wiring harness

Sensor GND

ECT sensor, MAF/IAT sensor, EGR boost sensor, TP sensor, HO2S
(Front, Rear ⁽³⁾), ECT sensor

Under any condition

Below 1.0

Related wiring harness

Engine speed

Tachometer (in instrument cluster), DLC terminal IG-

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

Tachometer
Related wiring harness

GND

Under any condition

Below 1.0

Related wiring harness

GND

Under any condition

Below 1.0

Related wiring harness

GND

Under any condition

Below 1.0

Related wiring harness

CKP+

CKP sensor

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

CKP sensor
Related wiring harness

CMP+

CMP sensor

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

CMP sensor
Related wiring harness

Refrigerant pressure switch (middle pressure)

A/C is operating

B+

Related wiring harness

Evaporative emission system leak detection pump (solenoid)

EVAP system leak detection pump

IG SW ON

B+

EVAP system leak detection pump
Related wiring harness

Idle

B+

Constant voltage (VREF)

TP sensor, EGR boost sensor,

IG SW ON

Approx. 5.0

Related wiring harness

Power supply

Main relay

IG SW ON

B+

Main relay
EGI fuse
Related wiring harness

IG SW OFF

Below 1.0

Generator field coil control

Generator (terminal D)

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

Generator
Related wiring harness

BARO/EGR boost

EGR boost sensor

IG SW ON (Barometric pressure at 102 kPa {765 mmHg, 30 inHg})

Approx. 4.3

EGR boost sensor
Related wiring harness

Throttle position

TP sensor

IG SW ON

CTP

0.7-1.2

TP sensor
Related wiring harness

WOT

4.15-4.8

ECT

ECT sensor

IG SW ON

ECT 20 °C {68 °F}

2.9-3.1

EGT sensor
Related wiring harness

After warm up

0.2-1.0

HO2S (Rear, RH) ⁽³⁾

HO2S (Rear, RH)

IG SW ON

Below 1.0

HO2S (Rear, RH)
Related wiring harness

Idle

Engine cold

Approx. 0

After warm up

0-0.9

- ⁽⁴⁾

HO2S (Rear, LH) ⁽³⁾

HO2S (Rear, LH)

IG SW ON

Below 1.0

HO2S (Rear, LH)
Related wiring harness

Idle

Engine cold

Approx. 0

After warm up

0-0.9

- ⁽⁴⁾

Main relay control

Main relay

IG SW ON

B+

Main relay
Related wiring harness

A/C control

A/C relay

Idle

A/C switch and fan switch ON

Below 1.0

A/C relay
Related wiring harness

A/C switch OFF

B+

Fuel injection (#6)

Fuel injector No.6

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

Fuel injection No.6
Related wiring harness

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

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

IGT1

Ignition coil (No.1 cylinder)

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

Ignition coil
Related wiring harness

PSP

PSP switch

IG SW ON

B+

PSP switch
Power steering system
Related wiring harness

Idle

Steering wheel at straight ahead position

B+

While turning steering wheel

Below 1.0

HO2S heater (Rear, RH) ⁽³⁾

HO2S heater (Rear, RH)

Idle

ECT above 70 °C {158 °F}

Below 1.0

HO2S heater (Rear, RH)
Related wiring harness

HO2S malfunctioning

B+

- ⁽⁴⁾

HO2S heater (Rear, LH) ⁽³⁾

HO2S heater (Rear, LH)

Idle

ECT above 70 °C {158 °F}

Below 1.0

HO2S heater (Rear, LH)
Related wiring harness

HO2S malfunctioning

B+

- ⁽⁴⁾

Power supply

Main relay

IG SW ON

B+

Main relay
Related Wiring harness

IG SW OFF

Below 1.0

Generator output voltage

Generator (terminal P)

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

Generator
Related wiring harness

64 ⁽²⁾

Immobilizer communication

Immobilizer unit

IG SW OFF

Below 1.0

Immobilizer unit
Related wiring harness

IG SW ON

B+

Generator warning light control

Generator warning light (in instrument cluster)

IG SW ON

Below 1.0

Generator warning light
Related wiring harness

Idle

B+

CAN-

CAN related module

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

Related wiring harness

67 ⁽¹⁾

Fuel pump control

Fuel pump relay

IG SW ON

B+

Fuel pump relay
Related wiring harness

Cranking

Below 1.0

Idle

Below 1.0

MIL control

MIL (in instrument cluster)

IG SW ON

Below 1.0

MIL
Related wiring harness

Idle

B+

Cooling fan control

Fan control module

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

Fan control module
Related wiring harness

ECT

Water temperature gauge (in instrument cluster)

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

ECT sensor
Related wiring harness

EGR valve #3 control coil

EGR valve (terminal B)

IG SW ON

B+

EGR valve
Related wiring harness

Idle

B+

EGR valve #4 coil control

EGR valve terminal F)

IG SW ON

Below 1.0

EGR valve
Related wiring harness

Idle

Below 1.0

Fuel injection (#5)

Fuel injector No.5

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

Fuel injector No.5
Related wiring harness

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

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

IGT4

Ignition coil (No.4 cylinder)

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

Ignition coil
Related wiring harness

Vehicle speed

Speedometer (in instrument cluster

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

VSS
Related wiring harness

Knocking

Knock sensor (+)

IG SW ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter)

Approx. 2.4

Knock sensor
Related wiring harness

Brake

Brake switch

Brake pedal depressed

B+

Brake switch
Related wiring harness

Brake pedal released

Below 1.0

HO2S heater (Front, RH)

IG SW ON

B+

HO2S heater (Front, RH)
Related wiring harness

Approx. 15 seconds after engine start with ECT 20-30 °C {68-86 °F}

Below 1.0

Others

1.0 < - > B+

HO2S heater (Front, LH)

IG SW ON

B+

HO2S heater (Front, LH)
Related wiring harness

Approx. 15 seconds after engine start with ECT 20-30 °C {68-86 °F}

Below 1.0

Others

1.0 < - > B+

Purge control

Purge solenoid valve

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

Purge solenoid valve
Related wiring harness

Back-up power supply

Battery (positive terminal)

Under any condition

B+

Battery
ROOM fuse
Related wiring harness

IAC power supply

IAC valve

IG SW ON

B+

IAC valve
Related wiring harness

Idle (After warm up and E/L OFF)

B+

IAC control

IAC valve

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

IAC valve
Related wiring harness

Torque reduction inhibit

ABS/TCS HU/CM

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

ABS/TCS HU/CM
Related wiring harness

Torque reduction request

ABS/TCS HU/CM

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

ABS/TCS HU/CM
Related wiring harness

CAN +

TCM

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

Related wiring harness

EGR boost sensor switching control

EGR boost sensor solenoid valve

IG SW ON

B+

EGR boost sensor solenoid valve
Related wiring harness

Idle

B+

EVAP system leak detection pump (pump)

EVAP system leak detection pump

IG SW ON

B+

EVAP system leak detection pump
Related wiring harness

Idle

B+

95 ⁽²⁾

Fuel pump control

Fuel pump relay

IG SW ON

B+

Fuel pump relay
Related wiring harness

Cranking

Below 1.0

Idle

Below 1.0

IMCC control

IMCC actuator

Idle

B+

IMCC Actuator
Related wiring harness

Above 3,750 rpm

Below 1.0

EGR valve #1 coil control

EGR valve (terminal E)

IG SW ON

Below 1.0

EGR valve
Related wiring harness

Idle

Below 1.0

EGR valve #2 coil control

EGR valve (terminal A)

IG SW ON

B+

EGR valve
Related wiring harness

Idle

B+

100

GND

Under any condition

Below 1.0

Related wiring harness

101

IGT6

Ignition coil (No.6 cylinder)

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

Ignition coil
Related wiring harness

102

IGT3

Ignition coil (No.3 cylinder)

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

Ignition coil
Related wiring harness

103

IGT5

Ignition coil (No.5 cylinder)

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

Ignition coil
Related wiring harness

104

IGT2

Ignition coil (No.2 cylinder)

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

Ignition coil
Related wiring harness

⁽¹⁾	Not equipped with immobilizer system

⁽²⁾	Equipped with immobilizer system

⁽³⁾	With rear HO2S model

⁽⁴⁾	Without rear HO2S model