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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) 

    Fig 1: Identifying PCM Harness Side Connector Terminals
    G04325120Courtesy of MAZDA MOTORS CORP.
PCM REFERENCE CHART

Terminal Signal Connected to Test condition Voltage (V) Inspection item
1A Security light control Security light IG SW ON Approx. 11.3
  • Related wiring harness
1B Starter relay control Starter relay Under any condition Below 1.0
  • Starter relay
  • Related wiring harnesses
1C - - - - -
1D Clutch operation(1) CPP switch Clutch pedal depressed Below 1.0
  • CPP switch
  • Related wiring harnesses
Clutch pedal released B+
1E Coil (Immobilizer system) Coil Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
  • Coil
  • Related wiring harnesses
1F Coil (Immobilizer system) Coil Because this terminal is for communication, good/no good judgment by terminal voltage is not possible.
  • Coil
  • Related wiring harnesses
1G - - - - -
1H Fuel pump control Fuel pump relay Ignition switch ON B+
  • Fuel pump relay
  • Related wiring harnesses
Cranking Below 1.0
Idle Below 1.0
1I A/C A/C relay A/C operating Below 1.0
  • A/C
A/C not operating B+
1J A/C compressor load Refrigerant pressure switch (middle) A/CON Refrigerant pressure is more than 1.52 MPa {15.5 kgf/cm2 , 220 psi} Below 1.0
  • Refrigerant pressure switch
  • Related wiring harnesses
Refrigerant pressure is less than 1.23 M Pa {12.5 kgf/cm2 , 178 psi} B+
1K VAD control VAD solenoid valve Idle after warm up Engine speed less than 5,800 RPM B+
  • VAD solenoid valve
  • Related wiring harnesses
Engine speed more than 5,800 RPM Below 1.0
1L - - - - -
1M Cooling fan control (Main) Cooling fan relay No.1 Idling ECT less than 100°C {212°F} B+
  • Cooling fan relay
  • Related wiring harnesses
A/C operating Below 1.0
1N Cooling fan control (Add) Cooling fan relay No.4 Idling ECT less than 100°C {212°F} B+
  • Cooling fan relay
  • Related wiring harnesses
A/C operating Below 1.0
1O VSS output signal VSS
  • Related wiring harnesses
1P MAF sensor GND MAF/IAT sensor Under any condition Below 1.0
  • Related wiring harnesses
1Q Main relay control Main relay Ignition switch OFF B+
  • Main relay
  • Related wiring harnesses
Ignition switch ON Below 1.0
1R Cooling fan control (Transfer) Cooling fan relay No.2 or No.3 Idling ECT less than 100°C {212°F} B+
  • Cooling fan relay
  • Related wiring harnesses
A/C operating Below 1.0
1S - - - - -
1T - - - - -
1U EVAP system leak detection pump (pump) EVAP system leak detection pump Ignition switch ON B+
  • EVAP system leak detection pump
  • Related wiring harness
Idle B+
1V EVAP system leak detection pump (solenoid) EVAP system leak detection pump IG SW ON B+
  • EVAP system leak detection pump
  • Related wiring harnesses
Idle B+
1W - - - - -
1X Neutral position(1) Neutral switch Shift lever is at neutral position Below 1.0
  • Neutral switch
  • Related wiring harnesses
Shift lever is not at neutral position B+
1Y - - - - -
1Z - - - - -
1AA - - - - -
1AB Brake 1 Brake switch Brake pedal depressed B+
  • Brake switch
  • Related wiring harnesses
Brake pedal released Below 1.0
1AC - - - - -
1AD - - - - -
1AE - - - - -
1AF Brake 2 Brake switch Brake pedal depressed B+
  • Brake switch
  • Related wiring harnesses
Brake pedal released Below 1.0
1AG - - - - -
1AH - - - - -
1AI CAN (L) Instrument cluster, ABS/TCS HU/CM, TCM Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.
  • Related wiring harnesses
1AJ Constant voltage (VREF) APP sensor Ignition switch ON Approx. 5.0
  • Related wiring harnesses
1AK MAF MAF sensor Ignition switch ON Approx. 0.7
  • MAF sensor
  • Related wiring harnesses
Idle (after warm up) MTX 1.15-1.28
ATX 1.18-1.31
1AL Constant voltage (VREF) APP sensor Ignition switch ON Approx. 5.0
  • Related wiring harnesses
1AM CAN (H) Instrument cluster, ABS HU/CM, TCM Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.
  • Related wiring harness
1AN - - - - -
1AO APP sensor 1 APP sensor IG SW ON APP released 1.55-1.62
  • APP sensor
  • Related wiring harness
APP depressed 3.49-4.09
1AP APP sensor 2 APP sensor IG SW ON APP released 1.01-1.07
  • APP sensor
  • Related wiring harness
APP depressed 2.94-3.54
1AQ Cruise control switch(2) Cruise control switch IG SW ON Depressing ON/OFF Approx. 0
  • Cruise control switch
  • Related wiring harnesses
Depressing CANCEL Approx. 1.2
Depressing SET/COAST Approx. 3.2
Depressing Res/ACCEL Approx. 4.2
Others Approx. 5.0
1AR IAT sensor GND MAF/IAT sensor Under any condition Below 1.0
  • Related wiring harnesses
1AS APP sensor GND APP sensor Under any condition Below 1.0
  • Related wiring harnesses
1AT IAT MAF/IAT sensor IG SW ON IAT 0°C {32°F} Approx. 3.43
  • MAF/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
IAT 80°C {176°F} Approx. 0.53
IAT 100°C {212°F} Approx. 0.33
1AU A/C A/C relay Idle A/C operating Below 1.0
  • A/C relay
  • Related wiring harness
A/C not operating B+
1AV APP sensor GND APP sensor Under any condition Below 1.0
  • Related wiring harnesses
1AW Back-up power supply(3) Main relay Under any condition B+
  • Main relay
  • Related wiring harness
1AX Throttle actuator control power supply Drive-by-wire relay Ignition switch OFF (after 90 s) Below 1.0
  • Drive-by-wire relay
  • Related wiring harnesses
Ignition switch ON B+
1AY Ignition switch (IG1) Ignition switch Ignition switch OFF Below 1.0
  • Ignition switch
  • Related wiring harnesses
Ignition switch ON B+
1AZ GND Ground Under any condition Below 1.0
  • Related wiring harnesses
1BA Back-up power supply Battery (positive terminal) Under any condition B+
  • Battery
  • Related wiring harness
1BB GND Ground Under any condition Below 1.0
  • Related wiring harnesses
1BC Sensor GND HO2S (rear) Under any condition Below 1.0
  • Related wiring harnesses
1BD GND Ground Under any condition Below 1.0
  • Related wiring harnesses
1BE Main relay control Main relay Ignition switch OFF B+
  • Main relay
  • Related wiring harnesses
Ignition switch ON Below 1.0
1BF Throttle actuator control power supply Drive-by-wire relay Ignition switch OFF (after 90 s) Below 1.0
  • Drive-by-wire relay
  • Related wiring harnesses
Ignition switch ON B+
1BG Sensor GND(3) HO2S (middle) Under any condition Below 1.0
  • Related wiring harnesses
1BH GND Ground Under any condition Below 1.0
  • Related wiring harnesses
2A Throttle actuator control (+) Throttle body Ignition switch ON B+
  • Throttle actuator
  • Related wiring harnesses
2B Throttle actuator control (-) Throttle body Idle (after warm up) 3.5-5.5
  • Throttle actuator
  • Related wiring harnesses
2C Purge control Purge solenoid valve
  • Purge solenoid valve
  • Related wiring harnesses
2D - - - - -
2E OCV control OCV
  • OCV valve
  • Related wiring harnesses
2F - - - - -
2G EGR valve #2 coil control EGR valve (terminal A) Ignition switch ON B+
  • EGR valve
  • Related wiring harnesses
Idle B+
2H EGR valve #4 coil control EGR valve (terminal F) Ignition switch ON Below 1.0
  • EGR valve
  • Related wiring harnesses
Idle Below 1.0
2I Variable tumble control Variable tumble solenoid valve ECT more than 60°C {140°F} while idling. B+
  • Variable tumble solenoid valve
  • Related wiring harnesses
ECT less than 60°C {140°F} and engine speed less than 3,750 RPM Below 1.0
2J Variable intake air control Variable intake air solenoid valve Engine speed: more than 4,500 RPM B+
  • Variable intake air solenoid valve
  • Related wiring harnesses
Engine speed: less than 4,500 RPM Below 1.0
2K EGR valve #1 coil control EGR valve (terminal E) Ignition switch ON Below 1.0
  • EGR valve
  • Related wiring harnesses
Idle Below 1.0
2L EGR valve #3 coil control EGR valve (terminal B) Ignition switch ON B+
  • EGR valve
  • Related wiring harnesses
idle B+
2M VSS (-)(4) VSS
  • VSS sensor
  • Related wiring harnesses
2N VSS (+)(4) VSS
  • VSS sensor
  • Related wiring harnesses
20 - - - - -
2P - - - - -
2Q HO2S (rear) HO2S (rear) Ignition switch ON Approx. 0
  • HO2S (rear)
  • Related wiring harnesses
Idle (after warm up) 01.0
2R HO2S (middle)(3) HO2S (middle) Ignition switch ON Approx. 0
  • HO2S (middle)
  • Related wiring harnesses
Idle (after warm up) 0<==>0.1
2S CMP signal CMP sensor
  • CMP sensor
  • Related wiring harnesses
2T PSP PSP switch Idle Steering wheel at straight ahead position B+
  • PSP switch
  • Power steering system
  • Related wiring harnesses
While turning steering wheel Below 1.0
2U Knocking (+) Knock sensor Ignition switch ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter) Approx. 4.3
  • Perform "On-Board Diagnostic Test"
  • Related wiring harnesses
2V Knocking (-) Knock sensor Ignition switch ON (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter) Below 1.0
  • Perform "On-Board Diagnostic Test"
  • Related wiring harnesses
2W CKP signal CKP sensor
  • CKP sensor
  • Related wiring harnesses
2X HO2S (front) shield HO2S (front) Under any condition Below 1.0
  • Related wiring harnesses
2Y - - - - -
2Z HO2S (front) sensor GND(3) HO2S (front) Under any condition Below 1.0
  • Related wiring harnesses
HO2S (front)(5) HO2S (front) Ignition switch ON Approx. 6.19
  • HO2S (front)
  • Related wiring harnesses
Ignition switch OFF (after 90 s) Below 1.0
Idle (after warm up) Approx. 4.1
2AA - - - - -
2AB - - - - -
2AC HO2S (front)(5) HO2S (front) Idle (after warm up): Approx. 0 mA -
  • HO2S (front)
  • Related wiring harnesses
2AD HO2S (front)(3) HO2S (front)
  • HO2S (front)
  • Related wiring harness
HO2S (front)(5) HO2S (front)
  • Verify that the voltage increases when the engine speed increases.
  • HO2S (front)
  • Related wiring harnesses
2AE Variable tumble shutter valve monitor Variable tumble shutter valve switch ECT less than 62°C {144°F} while engine speed less than 3,750 RPM Approx. 5.0
  • Variable tumble shutter valve switch
  • Related wiring harness
ECT more than 62°C {144°F} or engine speed 3,750 RPM or more Below 1.0
2AF - - - - -
2AG Manifold absolute pressure MAP sensor Ignition switch ON (Engine OFF) at sea level Approx. 4.1
  • MAP sensor
  • Related wiring harnesses
2AH ECT ECT sensor IG SW ON 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
2AI Generator field coil control Generator (terminal D)
  • Following PIDs: IAT, ECT, RPM, VPWR, ALTT V
  • Generator
  • Related wiring harness
2AJ Generator output voltage Generator (terminal P)
  • Generator
  • Related wiring harness
2AK TP (No. 1) TP sensor No. 1 Ignition switch ON APP released 0.4-0.6
  • TP sensor
  • Related wiring harness
APP depressed 4.4-4.7
2AL TP (No. 2) TP sensor No. 2 Ignition switch ON APP released 4.4-4.6
  • TP sensor
  • Related wiring harness
APP depressed 0.3-0.6
2AM CMP power CMP sensor Ignition switch ON B+
  • CMP sensor
  • Related wiring harnesses
Ignition switch OFF (after 90 s) Below 1.0
2AN - - - - -
2AO Constant voltage (VREF) TP sensor Under any condition Approx. 5.0
  • TP sensor
  • Related wiring harness
2AP TP sensor GND TP sensor Ignition switch ON Below 1.0
  • TP sensor
  • Related wiring harness
2AQ CKP power CKP sensor Ignition switch ON B+
  • CKP sensor
  • Related wiring harness
Ignition switch OFF Below 1.0
2AR - - - - -
2AS - - - - -
2AT IGT4 Ignition coil (No.4 cylinder)
  • Ignition coil
  • Related wiring harness
2AU Constant voltage (VREF) MAP sensor Ignition switch ON Approx. 5.0
  • Related wiring harnesses
2AV - - - - -
2AW IGT2 Ignition coil (No.2 cylinder)
  • Ignition coil
  • Related wiring harness
2AX IGT3 Ignition coil (No.3 cylinder)
  • Ignition coil
  • Related wiring harness
2AY Sensor GND ECT sensor, MAP sensor, variable tumble shutter valve switch Under any condition Below 1.0
  • Related wiring harnesses
2AZ Fuel injection (#4) Fuel injector No.4
  • Fuel injector No.4
  • Related wiring harnesses
2BA IGT1 Ignition coil (No.1 cylinder)
  • Ignition coil
  • Related wiring harness
2BB Fuel injection (#1) Fuel injector No.1
  • Fuel injector No.1
  • Related wiring harnesses
2BC Fuel injection (#2) Fuel injector No.2
  • Fuel injector No.2
  • Related wiring harnesses
2BD Fuel injection (#3) Fuel injector No.3
  • Fuel injector No.3
  • Related wiring harnesses
2BE HO2S (rear) heater control HO2S (rear) heater
  • HO2S (rear) heater
  • Related wiring harnesses
2BF HO2S (middle) heater control HO2S (middle) heater Engine speed: less than 4,000 RPM B+
  • HO2S (middle) heater
  • Related wiring harnesses
Engine speed: more than 4,000 RPM Below 1.0
2BG HO2S (front) heater control HO2S (front) heater
  • HO2S (front) heater
  • Related wiring harnesses
2BH - - - - -
(1) MTX
(2) Cruise control switch equipped
(3) California emission regulation applicable ATX model
(4) MTX, without ABS/DSC
(5) Except for California emission regulation applicable ATX model
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