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Home >> Mazda >> 2021 >> CX-3 FWD >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Pcm Inspection >> Without Using the M-MDS (With Coolant Control Valve)
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Without Using the M-MDS (With Coolant Control Valve)

NOTE:
  • Because the PCM uses a waterproof connector, the inspection for the voltage/wave pattern cannot be performed. The following values are for reference.

Terminal voltage table (Reference)

G12184593Courtesy of MAZDA MOTORS CORP.

-: Not applicable

Terminal Signal Connected to Test condition Voltage (V) Inspection item
1A CAN_2H CAN system related modules Because this terminal is for CAN, integrity determination by terminal voltage is not possible.
  • Related wiring harness
1B CAN_2L CAN system related modules Because this terminal is for CAN, integrity determination by terminal voltage is not possible.
  • Related wiring harness
1C - - - - -
1D Constant voltage (Vref) Engine oil pressure sensor, engine oil temperature sensor, coolant control valve position sensor, exhaust shutter valve position sensor Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
1E Constant voltage (Vref) CKP sensor Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
1F CKP CKP sensor (See CKP SIGNAL .)
  • CKP sensor
  • Related wiring harness
1G - - - - -
1H - - - - -
1I Coolant control valve position Coolant control valve position sensor Because this terminal is for SENT signal, integrity determination by terminal voltage is not possible.
  • Coolant control valve position sensor Related wiring harness
1J Constant voltage (Vref) MAP sensor Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
1K Constant voltage (Vref) Fuel pressure sensor Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
1L Constant voltage (Vref) TP sensor No. 1, TP sensor No. 2 Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
1M A/F A/F sensor Ignition switched ON (engine off) Approx. 5.0
  • A/F sensor
  • Related wiring harness
Idle (after warm up) Approx. 4.1
1N GND Sensor shield Under any condition Below 1.0
  • Related wiring harness
1O TP (No. 1) TP sensor No. 1 Ignition switched ON (engine off) Accelerator pedal released Approx. 1.11
  • TP sensor No. 1
  • Related wiring harness
Accelerator pedal depressed Approx. 4.59
1P - - - - -
1Q IAT (No. 2) IAT sensor No. 2 Ignition switched ON (engine off) IAT 20°C {68°F} Approx. 3.57
  • IAT sensor No. 2
  • Related wiring harness
IAT 40°C {104°F} Approx. 2.70
IAT 60°C {140°F} Approx. 1.87
1R GND TP sensor No. 1, TP sensor No. 2 Under any condition Below 1.0
  • Related wiring harness
1S A/F A/F sensor Idle (after warm up): 0 mA
  • A/F sensor
  • Related wiring harness
1T A/F A/F sensor Idle (after warm up) Approx. 4.1
  • A/F sensor
  • Related wiring harness
1U GND Sensor shield Under any condition Below 1.0
  • Related wiring harness
1V TP (No. 2) TP sensor No. 2 Ignition switched ON (engine off) Accelerator pedal released Approx. 3.92
  • TP sensor No. 1
  • Related wiring harness
Accelerator pedal depressed Below 1.0
1W Fuel pressure Fuel pressure sensor Idle (ECT 80°C{176°F}) Approx. 1.4
  • Fuel pressure sensor
  • Related wiring harness
1X MAP MAP sensor Ignition switched ON (engine off) Approx. 4.07
  • MAP sensor
  • Related wiring harness
Idle (after warm up) Approx. 1.37
Racing (Engine speed: 2, 000 RPM) Approx. 0.92
1Y Knocking (+) KS Ignition switched ON (engine off) (Use digital type voltmeter, because measurement voltage will be detected less than true voltage when using analog type voltmeter) Approx. 2.45
  • KS
  • Related wiring harness
1Z Knocking (-) KS Ignition switched ON (engine off) (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
1AA - - - - -
1AB GND ECT sensor No. 1, ECT sensor No. 2, engine oil pressure sensor, engine oil temperature sensor Under any condition Below 1.0
  • Related wiring harness
1AC - - - - -
1AD Electric variable valve timing driver (diagnostic) Electric variable valve timing driver (See ELECTRIC VARIABLE VALVE TIMING DRIVER (DIAGNOSTIC) SIGNAL .)
  • Electric variable valve timing driver
  • Related wiring harness
1AE Ion (No. 2) Ion sensor No. 2 Idle (after warm up) Approx. 4.4
  • Ion sensor No. 2
  • Related wiring harness
1AF Ion (No. 4) Ion sensor No. 4 Idle (after warm up) Approx. 4.4
  • Ion sensor No. 4
  • Related wiring harness
1AG Generator output voltage Generator (See GENERATOR OUTPUT VOLTAGE .)
  • Generator
  • Related wiring harness
1AH ECT ECT sensor No. 1 Ignition switched ON (engine off) ECT 20°C {68°F} Approx. 3.10
  • ECT sensor No. 1
  • Related wiring harness
ECT 40°C {104°F} Approx. 2.16
ECT 60°C {140°F} Approx. 1.40
ECT 80°C {176°F} Approx. 0.87
ECT 100°C {212°F} Approx. 0.54
1AI GND Intake CMP sensor, exhaust CMP sensor Under any condition Below 1.0
  • Related wiring harness
1AJ - - - - -
1AK Ion (No. 3) Ion sensor No. 3 Idle (after warm up) Approx. 4.4
  • Ion sensor No. 3
  • Related wiring harness
1AL Ion (No. 1) Ion sensor No. 1 Idle (after warm up) Approx. 4.4
  • Ion sensor No. 1
  • Related wiring harness
1AM ECT ECT sensor No. 2 Ignition switched ON (engine off) ECT 20°C {68°F} Approx. 3.10
  • ECT sensor No. 2
  • Related wiring harness
ECT 40°C {104°F} Approx. 2.16
ECT 60°C {140°F} Approx. 1.40
ECT 80°C {176°F} Approx. 0.87
ECT 100°C {212°F} Approx. 0.54
1AN Engine oil temperature Engine oil temperature sensor Ignition switched ON (engine off) Approx. 3.21
  • Engine oil temperature sensor
  • Related wiring harness
1AO - - - - -
1AP GND CKP sensor Under any condition Below 1.0
  • Related wiring harness
1AQ - - - - -
1AR - - - - -
1AS Engine oil pressure Engine oil pressure sensor Ignition switched ON (engine off) Below 1.0
  • Engine oil pressure sensor
  • Related wiring harness
Idle (after warm up) 1.07-1.47
1AT GND Sensor shield Under any condition Below 1.0
  • Related wiring harness
1AU - - - - -
1AV - - - - -
1AW Purge control Purge solenoid valve (See PURGE CONTROL .)
  • Purge solenoid valve
  • Related wiring harness
1AX - - - - -
1AY - - - - -
1AZ(1) Back up light Back up light switch Shift lever is at R position Below 1.0
  • Back up light switch
  • Related wiring harness
Shift lever is not at R position B+
1BA - - - - -
1BB - - - - -
1BC IGT1 Ignition coil No. 1 (See IGT1, IGT2, IGT3, IGT4 CONTROL .)
  • Ignition coil No. 1
  • Related wiring harness
1BD - - - - -
1BE - - - - -
1BF(1) Neutral position Neutral switch Shift lever is at neutral position Below 1.0
  • Neutral switch
  • Related wiring harness
Shift lever is not at neutral position B+
1BG GND Coolant control valve position sensor Under any condition Below 1.0
  • Related wiring harness
1BH GND MAP sensor, IAT sensor No. 2, fuel pressure sensor Under any condition Below 1.0
  • Related wiring harness
1BI IGT2 Ignition coil No. 2 (See IGT1, IGT2, IGT3, IGT4 CONTROL .)
  • Ignition coil No. 2
  • Related wiring harness
1BJ - - - - -
1BK - - - - -
1BL - - - - -
1BM Electric variable valve timing motor (rotation pulse) Electric variable valve timing motor (See ELECTRIC VARIABLE VALVE TIMING MOTOR (ROTATION PULSE) SIGNAL .)
  • Electric variable valve timing motor
  • Related wiring harness
1BN Electric variable valve timing motor (rotation direction) Electric variable valve timing motor (See ELECTRIC VARIABLE VALVE TIMING MOTOR (ROTATION DIRECTION) SIGNAL .)
  • Electric variable valve timing motor
  • Related wiring harness
1BO IGT3 Ignition coil No. 3 (See IGT1, IGT2, IGT3, IGT4 CONTROL .)
  • Ignition coil No. 3
  • Related wiring harness
1BP Generator field coil control Generator (See GENERATOR FIELD COIL CONTROL SIGNAL .)
  • Generator
  • Related wiring harness
1BQ - - - - -
1BR GND Sensor shield Under any condition Below 1.0
  • Related wiring harness
1BS - - - - -
1BT Intake CMP Intake CMP sensor (See INTAKE CMP SIGNAL .)
  • Intake CMP sensor
  • Related wiring harness
1BU IGT4 Ignition coil No. 4 (See IGT1, IGT2, IGT3, IGT4 CONTROL .)
  • Ignition coil No. 4
  • Related wiring harness
1BV Electric variable valve timing control Electric variable valve timing driver (See ELECTRIC VARIABLE VALVE TIMING CONTROL SIGNAL .)
  • Electric variable valve timing driver
  • Related wiring harness
1BW - - - - -
1BX - - - - -
1BY - - - - -
1BZ Exhaust CMP Exhaust CMP sensor (See EXHAUST CMP SIGNAL .)
  • Exhaust CMP sensor
  • Related wiring harness
1CA - - - - -
1CB A/F sensor heater control A/F sensor heater (See A/F SENSOR HEATER CONTROL SIGNAL .)
  • A/F sensor heater
  • Related wiring harness
1CC - - - - -
1CD - - - - -
1CE - - - - -
1CF - - - - -
1CG - - - - -
1CH - - - - -
1CI - - - - -
1CJ - - - - -
1CK Engine oil control Engine oil solenoid valve (See ENGINE OIL CONTROL SIGNAL .)
  • Engine oil solenoid valve
  • Related wiring harness
1CL - - - - -
1CM - - - - -
1CN - - - - -
1CO Hydraulic variable valve timing control OCV (See HYDRAULIC VARIABLE VALVE TIMING CONTROL SIGNAL .)
  • OCV
  • Related wiring harness
1CP - - - - -
1CQ Drive-by-wire control (+) Throttle valve actuator (See DRIVE-BY-WIRE CONTROL (+) SIGNAL .)
  • Throttle valve actuator
  • Related wiring harness
1CR Drive-by-wire control (-) Throttle valve actuator Idle (after warm up) Because the drive-by-wire control (-) terminal value varies depending on the vehicle, examination using only the ICQ terminal is not possible. When performing the inspection, perform it together with the ICR terminal.
  • Type A - B+
  • Type B - Approx. 0
  • Throttle valve actuator
  • Related wiring harness
1CS - - - - -
1CT - - - - -
1CU Fuel injection control (+) Fuel injector No. 3 (See FUEL INJECTION CONTROL (+) SIGNAL .)
  • Fuel injector No. 3
  • Related wiring harness
1CV Fuel injection control (-) Fuel injector No. 3 (See FUEL INJECTION CONTROL (-) SIGNAL .)
  • Fuel injector No. 3
  • Related wiring harness
1CW Coolant control valve control (+) Coolant control valve Ignition switched ON (engine off) B+
  • Coolant control valve
  • Related wiring harness
1CX Coolant control valve control (-) Coolant control valve Ignition switched ON (engine off) B+
  • Coolant control valve
  • Related wiring harness
1CY Fuel injection control (+) Fuel injector No. 2 (See FUEL INJECTION CONTROL (+) SIGNAL .)
  • Fuel injector No. 2
  • Related wiring harness
1CZ Fuel injection control (-) Fuel injector No. 2 (See FUEL INJECTION CONTROL (-) SIGNAL .)
  • Fuel injector No. 2
  • Related wiring harness
1DA - - - - -
1DB - - - - -
1DC Fuel injection control (+) Fuel injector No. 4 (See FUEL INJECTION CONTROL (+) SIGNAL .)
  • Fuel injector No. 4
  • Related wiring harness
1DD Fuel injection control (-) Fuel injector No. 4 (See FUEL INJECTION CONTROL (-) SIGNAL .)
  • Fuel injector No. 4
  • Related wiring harness
1DE - - - - -
1DF - - - - -
1DG Fuel injection control (+) Fuel injector No. 1 (See FUEL INJECTION CONTROL (+) SIGNAL .)
  • Fuel injector No. 1
  • Related wiring harness
1DH Fuel injection control (-) Fuel injector No. 1 (See FUEL INJECTION CONTROL (-) SIGNAL .)
  • Fuel injector No. 1
  • Related wiring harness
1DI High pressure fuel pump control (+) High pressure fuel pump (See HIGH PRESSURE FUEL PUMP CONTROL (+) SIGNAL .)
  • High pressure fuel pump
  • Related wiring harness
1DJ High pressure fuel pump control (-) High pressure fuel pump (See HIGH PRESSURE FUEL PUMP CONTROL (-) SIGNAL .)
  • High pressure fuel pump
  • Related wiring harness
2A Battery voltage Battery Ignition switched ON (engine off) B+
  • Fuel injector relay
  • Related wiring harness
2B Main relay control Main relay Ignition switched ON (engine off) Below 1.0
  • Main relay
  • Related wiring harness
2C - - - - -
2D Fuel pump control Fuel pump control module (See FUEL PUMP CONTROL SIGNAL .)
  • Fuel pump control module
  • Related wiring harness
2E - - - - -
2F Ignition (IG1) IG1 relay Ignition switched ON (engine off) B+
  • IG1 relay
  • Related wiring harness
2G - - - - -
2H Starter cutoff control Starter relay, start stop unit Ignition switched ON (engine off) Selector lever position is not P or N position B+
  • Starter relay
  • Start stop unit
  • Related wiring harness
Selector lever position is P or N position Below 1.0
2I Fan control Fan control module Switch ignition ON (engine off) Approx. 0.61
  • Fan control module
  • Related wiring harness
2J - - - - -
2K - - - - -
2L - - - - -
2M - - - - -
2N - - - - -
2O - - - - -
2P Brake (No. 2) Brake switch (No. 2 signal) Brake pedal released Below 1.0
  • Brake switch (No. 2 signal)
  • Related wiring harness
Brake pedal depressed B+
2Q - - - - -
2R Ambient temperature Ambient temperature sensor Ignition switched ON (engine off) AAT 20°C {68°F} Approx. 2.70
  • Ambient temperature sensor
  • Related wiring harness
AAT 30°C {104°F} Approx. 1.80
2S CAN_H CAN system related modules Because this terminal is for CAN, integrity determination by terminal voltage is not possible.
  • Related wiring harness
2T CAN_L CAN system related modules Because this terminal is for CAN, integrity determination by terminal voltage is not possible.
  • Related wiring harness
2U - - - - -
2V - - - - -
2W - - - - -
2X - - - - -
2Y - - - - -
2Z - - - - -
2AA - - - - -
2AB Brake (No. 1) Brake switch (No. 1 signal) Brake pedal released Below 1.0
  • Brake switch (No. 1 signal)
  • Related wiring harness
Brake pedal depressed B+
2AC - - - - -
2AD - - - - -
2AE - - - - -
2AF A/C cut-off control A/C relay A/C relay OFF B+
  • A/C relay
  • Related wiring harness
A/C relay ON Below 1.0
2AG - - - - -
2AH (1) CPP CPP switch, start stop unit Clutch pedal fully depressed Below 1.0
  • CPP switch
  • Start stop unit
  • Related wiring harness
Clutch pedal released B+
2AI GND MAF sensor, IAT sensor No. 1, refrigerant pressure sensor, ambient temperature sensor Under any condition Below 1.0
  • Related wiring harness
2AJ (2) 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
2AK - - - - -
2AL (2) CV solenoid control CV solenoid valve Ignition switched ON (engine off) B+
  • CV solenoid valve
  • Related wiring harness
Idle (CV solenoid valve not operating) B+
Idle (CV solenoid valve operating) Below 1.0
2AM Cooling fan control Cooling fan relay Cooling fan operating Below 1.0
  • Cooling fan relay
  • Related wiring harness
Cooling fan not operating B+
2AN - - - - -
2AO Constant voltage (Vref) APP sensor No. 2 Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
2AP (1) Clutch stroke sensor Clutch stroke sensor Clutch pedal depressed Below 1.0
  • Clutch stroke sensor
  • Related wiring harness
Clutch pedal released Approx. 4.5
2AQ - - - - -
2AR - - - - -
2AS - - - - -
2AT Constant voltage (Vref) MAF sensor, IAT sensor No. 1 Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
2AU Constant voltage (Vref) Clutch stroke sensor, fuel tank pressure sensor Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
2AV Refrigerant pressure Refrigerant pressure sensor Refrigerant pressure: 1.0 MPa {10 kgf/cm2 , 145 psi} Approx. 1.58
  • Refrigerant pressure sensor
  • Related wiring harness
Refrigerant pressure: 1.1 MPa {11 kgf/cm2 , 160 psi} Approx. 1.75
Refrigerant pressure: 1.2 MPa {12 kgf/cm2 , 174 psi} Approx. 1.88
2AW Fuel pump control Fuel pump relay Ignition switched ON (engine off) B+
  • Fuel pump relay
  • Related wiring harness
Idle (after warm up) Below 1.0
2AX Fuel pump control module (diagnostic) Fuel pump control module (See FUEL PUMP CONTROL MODULE (DIAGNOSTIC) SIGNAL .)
  • Fuel pump control module
  • Related wiring harness
2AY - - - - -
2AZ Constant voltage (Vref) Refrigerant pressure sensor Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
2BA Constant voltage (Vref) APP sensor No. 1 Ignition switched ON (engine off) Approx. 5.0
  • Related wiring harness
2BB APP (No. 2) APP sensor No. 2 Ignition switched ON (engine off) Accelerator pedal released Approx. 0.38
  • APP sensor No. 2
  • Related wiring harness
Accelerator pedal depressed Approx. 2.05
2BC - - - - -
2BD Selector lever position TCM, start stop unit Selector lever position is not P or N position B+
  • TCM
  • Start stop unit
  • Related wiring harness
Selector lever position is P or N position Below 1.0
2BE Intake air MAF sensor, IAT sensor No. 1 Because this terminal is for SENT signal, integrity determination by terminal voltage is not possible.
  • MAF sensor, IAT sensor No. 1 Related wiring harness
2BF - - - - -
2BG GND APP sensor No. 2 Under any condition Below 1.0
  • Related wiring harness
2BH GND APP sensor No. 1 Under any condition Below 1.0
  • Related wiring harness
2BI - - - - -
2BJ HO2S heater control HO2S heater (See HO2S HEATER CONTROL SIGNAL .)
  • HO2S heater
  • Related wiring harness
2BK HO2S (+) HO2S Idle (after warm up) Approx. 2.15
  • HO2S
  • Related wiring harness
2BL HO2S (-) HO2S Idle (after warm up) Approx. 2.05
  • HO2S
  • Related wiring harness
2BM GND Sensor shield Under any condition Below 1.0
  • Related wiring harness
2BN APP (No. 1) APP sensor No. 1 Ignition switched ON (engine off) Accelerator pedal released Approx. 0.75
  • APP sensor No. 1
  • Related wiring harness
Accelerator pedal depressed Approx. 4.1
2BO Main power supply Main relay Ignition switched ON (engine off) B+
  • Main relay
  • Related wiring harness
2BP - - - - -
2BQ GND GND Under any condition Below 1.0
  • Related wiring harness
2BR Main power supply Main relay Ignition switched ON (engine off) B+
  • Main relay
  • Related wiring harness
2BS - - - - -
2BT GND GND Under any condition Below 1.0
  • Related wiring harness
*1: ATX
(1) MTX
(2) U.S.A. and Canada specs.

*4: If equipped
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