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Home › Mazda › 2011 › CX-7 i SV, 2.5 M › Repair and Diagnosis › Engine Performance › Engine Control Systems › Engine Control System [L5] › Pcm Inspection › Without Using the M-MDS › PCM inspection preparation

PCM inspection preparation

  1. Disconnect the negative battery cable.
  2. Remove the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [L5] .)
  3. Remove the windshield wiper arm and blade. (See WINDSHIELD WIPER ARM AND BLADE REMOVAL/INSTALLATION .)
  4. Remove the cowl grille. (See COWL GRILLE REMOVAL/INSTALLATION .)
  5. Remove the windshield wiper motor. (See WINDSHIELD WASHER MOTOR REMOVAL/INSTALLATION .)
  6. Remove the cowl panel. (See COWL PANEL REMOVAL/INSTALLATION .)
  7. Remove the PCM bracket with the PCM connector still connected. (See PCM REMOVAL/INSTALLATION .)
  8. Install the battery and battery tray. (See BATTERY REMOVAL/INSTALLATION [L5] .)
  9. Connect the negative battery cable.

Terminal voltage table (Reference) 

Fig 1: Identifying PCM Harness Side Connector End View & Terminal Layout
G06724887Courtesy of MAZDA MOTORS CORP.
TERMINAL VOLTAGE REFERENCE

Terminal Signal Connected to Test condition Voltage (V) inspection item
1A Power supply Main relay Turn the ignition switch to off Below 1.0
  • Related wiring harness
Turn the ignition switch to the ON position B+
1B Power supply Main relay Turn the ignition switch to off Below 1.0
  • Related wiring harness
Turn the ignition switch to the ON position B+
1C Back-up power supply Battery (positive terminal) Under any condition B+
  • Battery
  • Related wiring harness
1D - - - - -
1E GND Ground Under any condition Below 1.0
  • Related wiring harness
1F GND Ground Under any condition Below 1.0
  • Related wiring harness
1G GND Ground Under any condition Below 1.0
  • Related wiring harness
1H - - - - -
1I A/C A/C relay A/C operating Below 1.0
  • A/C relay
  • Related wiring harness
A/C not operating B+
1J - - - - -
1K - - - - -
1L - - - - -
1M CV solenoid control CV solenoid valve Turn the ignition switch to the ON position B+
  • CV solenoid valve
  • Related wiring harness
Idle (CV solenoid valve not operating) B+
Idle (CV solenoid valve operating) Below 1.0
1N - - - - -
1O - - - - -
1P MAF sensor GND MAF/IAT sensor Under any condition Below 1.0
  • Related wiring harness
1Q Main relay control Main relay Turn the ignition switch to off B+
  • Main relay
  • Related wiring harness
Turn the ignition switch to the ON position Below 1.0
1R Cooling fan control Fan control module No. 1, No. 2
  • Fan control module No. 1, No. 2
  • Related wiring harness
1S - - - - -
1T - - - - -
1U Cooling fan relay GND Cooling fan relay No. 1, No. 2 Cooling fan operating Below 1.0
  • Cooling relay No. 1, No. 2
  • Related wiring harness
Cooling fan not operating B+
1V - - - - -
1W Constant voltage (Vref) APP sensor Turn the ignition switch to the ON position Approx. 5.0
  • Related wiring harness
1X - - - - -
1Y - - - - -
1Z - - - - -
1AA - - - - -
1AB Brake (No. 1) Brake switch No. 1 Brake pedal depressed B+
  • Brake switch No. 1
  • Related wiring harness
Brake pedal released Below 1.0
1AC IAT IAT sensor IG SW ON IAT 20°C {68°F} Approx. 2.38
  • IAT sensor
  • Related wiring harness
IAT 60°C {140°F} Approx. 0.89
1AD Constant voltage (Vref) Fuel tank pressure sensor Turn the ignition switch to the ON position Approx. 5.0
  • Related wiring harness
1AE Constant voltage (Vref) APP sensor Turn the ignition switch to the ON position Approx. 5.0
  • Related wiring harness
1AF(1) Brake (No. 2) Brake switch No. 2 Brake pedal depressed B+
  • Brake switch No. 2
  • Related wiring harness
Brake pedal released Below 1.0
1AG - - - - -
1AH Fuel tank pressure Fuel tank pressure sensor Fuel tank pressure is 10 kPa {0.10 kgf/cm2 , 1.5 psi} lower than barometric pressure Approx. 1.2
  • Fuel tank pressure sensor
  • Related wiring harness
Fuel tank pressure is equal to barometric pressure Approx. 2.6
Fuel tank pressure is 6 kPa {0.06 kgf/cm2 , 0.9 psi} higher than barometric pressure Approx. 3.7
1AI CAN (-) CAN system related modules Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.
  • Related wiring harness
1AJ APP sensor GND APP sensor Under any condition Below 1.0
  • Related wiring harness
1AK MAF MAF sensor Turn the ignition switch to the ON position Approx. 0.7
  • MAF sensor
  • Related wiring harness
Idle (after warm up) Approx. 1.2
1AL - - - - -
1AM CAN (+) CAN system related modules Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible.
  • Related wiring harness
1AN(1) Cruise control switch ground Cruise control switch Under any condition Below 1.0
  • Related wiring harness
1AO APP sensor 2 APP sensor No. 2
  • APP sensor No. 2
  • Related wiring harness
1AP APP sensor 1 APP sensor No. 1 IG SW ON Accelerator pedal released 1.56-1.65
  • APP sensor No. 1
  • Related wiring harness
Accelerator pedal depressed 3.65-3.93
1AQ(1) Cruise control switch Cruise control switch Ignition switch to the ON position OFF switch pressed in Approx. 0.05
  • Cruise control switch
  • Related wiring harness
CANCEL switch pressed in Approx. 0.98
SET (+) switch pressed in Approx. 2.73
SET(-) switch pressed in Approx. 1.88
RESUME switch pressed in Approx. 3.45
ON switch pressed in Approx. 4.05
1AR IAT sensor GND MAF/IAT sensor Under any condition Below 1.0
  • Related wiring harness
1AS - - - - -
1AT - - - - -
1AU - - - - -
1AV APP sensor GND APP sensor Under any condition Below 1.0
  • Related wiring harness
1AW - - - - -
1AX - - - - -
1AY Ignition switch (IG1) Ignition switch Turn the ignition switch to off Below 1.0
  • Ignition switch
  • Related wiring harness
Turn the ignition switch to the ON position B+
1AZ - - - - -
1BA Purge control Purge solenoid valve
  • Purge solenoid valve
  • Related wiring harness
1BB Starter relay control Starter relay Cranking B+
  • Starter relay
  • Related wiring harness
1BC - - - - -
1BD - - - - -
1BE GND Ground Under any condition Below 1.0
  • Related wiring harness
1BF - - - - -
1BG Fuel pump control Fuel pump relay Turn the ignition switch to the ON position B+
  • Fuel pump relay
  • Related wiring harness
Cranking Below 1.0
Idle Below 1.0
1BH - - - - -
2A A/F sensor heater control A/F sensor heater
  • A/F sensor heater
  • Related wiring harness
2B HO2S heater control HO2S heater
  • HO2S heater
  • Related wiring harness
2C - - - - -
2D - - - - -
2E OCV control OCV
  • OCV
  • Related wiring harness
2F - - - - -
2G IGT1 Ignition coil No. 1
  • Ignition coil No. 1
  • Related wiring harness
2H IGT4 Ignition coil No. 4
  • Ignition coil No. 4
  • Related wiring harness
21 Variable tumble control Variable tumble solenoid valve ECT above 60°C {140°F} while idling. B+
  • Variable tumble solenoid valve
  • Related wiring harness
ECT below 60°C {140°F} and engine speed below 3,750 RPM Below 1.0
2J Variable intake air control Variable intake air solenoid valve Engine speed: above 4,400 RPM B+
  • Variable intake air solenoid valve
  • Related wiring harness
Engine speed: below 4,400 RPM Below 1.0
2K IGT2 Ignition coil No. 2
  • Ignition coil No. 2
  • Related wiring harness
2L IGT3 Ignition coil No. 3
  • Ignition coil No. 3
  • Related wiring harness
2M - - - - -
2N - - - - -
20 A/F sensor GND A/F sensor Under any condition Below 1.0
  • Related wiring harness
2P - - - - -
2Q HO2S HO2S Idle (after warm up) 0<=>1.0
  • HO2S
  • Related wiring harness
2R Variable tumble shutter valve monitor Variable tumble shutter valve switch ECT above 60°C {140°F} while idling. 0.808-1.832
  • Variable tumble shutter valve switch
  • Related wiring harness
ECT below 60°C {140°F} and engine speed below 3,750 RPM 3.408-4.432
2S CMP signal CMP sensor
  • CMP sensor
  • Related wiring harness
2T PSP PSP switch Idle Steering wheel at straight ahead position B+
  • PSP switch
  • Related wiring harness
While turning steering wheel Below 1.0
2U Knocking (+) KS Turn the 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. 4.0
  • KS
  • Related wiring harness
2V Knocking (-) KS Turn the 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
2W CKP signal CKP sensor
  • Inspect using the wave profile.
(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) .)
  • CKP sensor
  • Related wiring harness
2X GND Sensor shield Under any condition Below 1.0
  • Related wiring harness
2Y A/F sensor calibration resistor A/F sensor Ignition switch off after 10s Below 1.0
  • A/F sensor
  • Related wiring harness
Ignition switch to the ON position Approx. 3.9
2Z A/F sensor A/F sensor Idle (after warm up) Approx. 5.1
  • A/F sensor
  • Related wiring harness
2AA Generator field coil control Generator (terminal D)
  • Generator
  • Related wiring harness
2AB - - - - -
2AC A/F sensor A/F sensor Idle (after warm up): Approx. 0 mA
  • A/F sensor
  • Related wiring harness
2AD A/F sensor A/F sensor
  • Verify that the voltage increases when the engine speed increases.
  • A/F sensor
  • Related wiring harness
2AE - - - - -
2AF Generator output voltage Generator (terminal P)
  • Generator
  • Related wiring harness
2AG MAP MAP sensor Turn the ignition switch to the ON position Approx. 4.1
  • MAP sensor
  • Related wiring harness
Idle Approx. 1.2
2AH ECT ECT sensor Turn the ignition switch to the ON position ECT 20°C {68°F} 3.04- 3.14
  • ECT sensor
  • Related wiring harness
ECT 80°C {176°F} 0.76- 0.83
2AI - - - - -
2AJ - - - - -
2AK TP sensor 1 TP sensor No. 1 Turn the ignition switch to the ON position Accelerator pedal released Approx. 0.6
  • TP sensor No. 1
  • Related wiring harness
Accelerator pedal depressed Approx. 4.2
2AL TP sensor 2 TP sensor No. 2 Turn the ignition switch to the ON position Accelerator pedal released Approx. 4.4
  • TP sensor No. 2
  • Related wiring harness
Accelerator pedal depressed Approx. 0.8
2AM CMP power CMP sensor Turn the ignition switch to the ON position B+
  • Related wiring harness
Turn the ignition switch to off (after 10 s) Below 1.0
2AN TP sensor GND TP sensor Under any condition Below 1.0
  • Related wiring harness
2AO - - - - -
2AP - - - - -
2AQ CKP power CKP sensor Turn the ignition switch to the ON position B+
  • Related wiring harness
Turn the ignition switch to off Below 1.0
2AR Constant voltage (Vref) TP sensor Turn the ignition switch to the ON position Approx. 5.0
  • Related wiring harness
2AS HO2S GND HO2S Under any condition Below 1.0
  • Related wiring harness
2AT EGR valve control EGR valve Idle B+
  • EGR valve
  • Related wiring harness
2AU Constant voltage (Vref) MAP sensor, variable tumble shutter valve switch Turn the ignition switch to the ON position Approx. 5.0
  • Related wiring harness
2AV Sensor GND MAP sensor, ECT sensor, variable tumble shutter valve switch Under any condition Below 1.0
  • Related wiring harness
2AW EGR valve control EGR valve Idle Below 1.0
  • EGR valve
  • Related wiring harness
2AX EGR valve control EGR valve Idle Below 1.0
  • EGR valve
  • Related wiring harness
2AY - - - - -
2AZ Fuel injection (#4) Fuel injector No. 4
  • Fuel injector No. 4
  • Related wiring harness
2BA EGR valve control EGR valve Idle B+
  • EGR valve
  • Related wiring harness
2BB Fuel injection (#1) Fuel injector No. 1
  • Fuel injector No. 1
  • Related wiring harness
2BC Fuel injection (#2) Fuel injector No. 2
  • Fuel injector No. 2
  • Related wiring harness
2BD Fuel injection (#3) Fuel injector No. 3
  • Fuel injector No. 3
  • Related wiring harness
2BE Throttle valve actuator control (+) Throttle body (throttle valve actuator) Idle (after warm up) B+
  • Throttle valve actuator
  • Related wiring harness
2BF Throttle valve actuator control (-) Throttle body (throttle valve actuator) Idle (after warm up) 3.5-5.5
  • Throttle valve actuator
  • Related wiring harness
2BG OCV control OCV Turn the ignition switch to the ON position B+
  • OCV
  • Related wiring harness
2BH - - - - -
(1) With cruise control system
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