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Home >> Mazda >> 2010 >> 5 Touring, 2.3 3 >> Repair and Diagnosis >> Engine Performance >> Engine Control Systems >> Engine Control System [L3] >> Pcm Inspection >> Without Using M-MDS

Without Using M-MDS

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
    G05543201Courtesy of MAZDA MOTORS CORP.
TERMINALS REFERENCE

Terminal Signal Connected to Test condition Voltage (V) Inspection item
1A Main relay control Main relay Ignition switch OFF Below 1.0
  • Main relay
  • Related wiring harness
Ignition switch ON B+
1B - - - - -
1C Back-up power supply Battery (positive terminal) Under any condition B+
  • Battery
  • Related wiring harness
1D - - - - -
1E Ground Ground Under any condition Below 1.0
  • Related wiring harness
1F Ground Ground Under any condition Below 1.0
  • Related wiring harness
1G Ground Ground Under any condition Below 1.0
  • Related wiring harness
1H - - - - -
1I A/C A/C relay Idle A/C operating Below 1.0
  • A/C relay
  • Related wiring harness
A/C not operating B+
1J - - - - -
1K - - - - -
1L 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+
1M - - - - -
1N - - - - -
1O - - - - -
1P Sensor ground MAF sensor Under any condition Below 1.0
  • Related wiring harness
1Q Main relay control Main relay Ignition switch OFF B+
  • Main relay
  • Related wiring harness
Ignition switch ON Below 1.0
1R Cooling fan control Fan control module
  • Fan control module
  • Related wiring harness
1S - - - - -
1T - - - - -
1U - - - - -
1V - - - - -
1W - - - - -
1X 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+
1Y - - - - -
1Z - - - - -
1AA - - - - -
1AB Brake Brake switch Brake pedal released Below 1.0
  • Brake switch
  • Related wiring harness
Brake pedal depressed B+
1AC - - - - -
1AD - - - - -
1AE - - - - -
1AF - - - - -
1AG - - - - -
1AH - - - - -
1AI CAN (L) Instrument cluster, ABS HU/CM Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible. -
1AJ - - - - -
1AK MAF MAF sensor Ignition switch ON Approx. 0.7
  • MAF sensor
  • Related wiring harness
Idle (after warm up) Approx. 1.2
1AL Constant voltage (Vref) APP sensor Ignition switch ON Approx. 5.0
  • Related wiring harness
1AM CAN (H) Instrument cluster, ABS HU/CM Because this terminal is for CAN, good/no good judgment by terminal voltage is not possible. -
1AN - - - - -
1AO APP (No. 2) APP sensor (No. 2)
  • Inspect using the wave profile.

(See INSPECTION USING AN OSCILLOSCOPE (REFERENCE) )
  • APP sensor
  • Related wiring harness
1AP APP (No. 1) APP sensor (No. 1) Ignition switch to the ON position Accelerator pedal released Approx. 0.4
  • APP sensor
  • Related wiring harness
Accelerator pedal depressed Approx. 3.3
1AQ Cruise control switch Cruise control switch Ignition switch to the ON position Cruise main switch ON Approx. 0
  • Cruise control switch
  • Related wiring harnesses
Cancel switch ON Approx. 1.8
Set/Cost switch ON Approx. 3.8
Res/Ace switch ON Approx. 4.6
Other Approx. 5.0
1AR - - - - -
1AS - - - - -
1AT IAT IAT sensor Ignition switch ON IAT 20 °C {68 °F} Approx. 2.38
  • IAT sensor
  • Related wiring harness
IAT 60 °C {140 °F} Approx. 0.89
1AU - - - - -
1AV Sensor ground APP sensor, IAT sensor Under any condition Below 1.0
  • Related wiring harness
1AW Refrigerant pressure switch (high and low) Refrigerant pressure switch (high and low) Idle A/C operation Below 1.0
  • A/C relay
  • Related wiring harness
A/C not operation B+
1AX Refrigerant pressure switch (middle) Refrigerant pressure switch (middle) A/CON Refrigerant pressure is above 1.52 MPa {15.5 kgf/cm2 , 220 psi} Below 1.0
  • Refrigerant pressure switch (middle)
  • Related wiring harness
Refrigerant pressure is below 1.23 MPa {12.5 kgf/cm2 , 178 psi} B+
1AY Ignition switch Ignition switch Ignition switch off Below 1.0
  • Ignition switch
  • Related wiring harness
Ignition switch to the ON position B+
1AZ Drive-by-wire relay control Drive-by-wire relay Ignition switch off B+
  • Drive-by-wire relay
  • Related wiring harness
Ignition switch to the ON position Below 1.0
1BA - - - - -
1BB Starter relay control Starter relay Under any condition Below 1.0
  • Starter relay
  • Related wiring harness
1BC(1) Neutral position Neutral switch Shift lever is at neutral position Below 1.0
  • Neutral switch
  • Related wiring harness
1BD(1) Clutch operation CPP switch Clutch pedal depressed Below 1.0
  • CPP switch
  • Related wiring harness
Clutch pedal released B+
1BE Ground Ground Under any condition Below 1.0
  • Main relay
  • Related wiring harness
1BF Drive-by-wire relay power supply Drive-by-wire relay Ignition switch OFF Below 1.0
  • Drive-by-wire relay
  • Related wiring harness
Ignition switch to the ON position B+
1BG Fuel pump control Fuel pump relay Ignition switch ON 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 Purge control Purge solenoid valve
  • Purge solenoid valve
  • Related wiring harness
2D - - - - -
2E OCV OCV
  • OCV
  • Related wiring harness
2F - - - - -
2G IGT1 Ignition coil (No. 1 cylinders)
  • Ignition coil
  • Related wiring harness
2H IGT4 Ignition coil (No. 4 cylinders)
  • Ignition coil
  • Related wiring harness
2I Variable tumble control Variable tumble solenoid valve ECT below 63 °C {145 °F} and engine speed below 3,750 rpm B+
  • Variable tumble solenoid valve
  • Related wiring harness
ECT above 63 °C {145 °F} or engine speed above 3,750 rpm Below 1.0
2J Variable intake air control Variable intake air solenoid valve Engine speed: below 4,600 rpm Below 1.0
  • Variable intake air solenoid valve
  • Related wiring harness
Engine speed: above 4,600 rpm B+
2K IGT2 Ignition coil (No. 2 cylinders)
  • Ignition coil
  • Related wiring harness
2L IGT3 Ignition coil (No. 3 cylinders)
  • Ignition coil
  • Related wiring harness
2M - - - - -
2N - - - - -
2O - - - - -
2P - - - - -
2Q HO2S HO2S Idle (after warm up) Alternates between 0 and 1.0
  • HO2S
  • Related wiring harness
2R(3) Variable tumble shutter valve monitor Variable tumble shutter valve switch ECT below 63 °C {145 °F} and engine speed below 3,750 rpm B+
  • Variable tumble shutter valve switch
  • Related wiring harness
2S CMP CMP sensor
  • CMP sensor
  • Related wiring harness
2T - - - - -
2U Knocking (+) KS 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
  • KS
  • Related wiring harness
2V Knocking (-) KS 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
  • KS
  • Related wiring harness
2W CKP CKP sensor
  • CKP sensor
  • Related wiring harness
2X Shield wire A/F sensor, KS Under any condition Below 1.0
  • Related wiring harness
2Y - - - - -
2Z A/F sensor power supply A/F sensor Idle (after warm up) Approx. 4.1
  • A/F sensor
  • Related wiring harness
2AA Generator field coil control Generator
  • 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(2) Variable tumble shutter valve monitor Variable tumble shutter valve switch ECT below 63 °C {145 °F} and engine speed below 3,750 rpm B+
  • Variable tumble shutter valve switch
  • Related wiring harness
ECT above 63 °C {145 °F} or engine speed above 3,750 rpm Below 1.0
2AF Generator output voltage Generator
  • Generator
  • Related wiring harness
2AG Manifold absolute pressure MAP sensor Ignition switch ON (at sea level) Approx. 4.1
  • MAP sensor
  • Related wiring harness
Idle Approx. 1.4
2AH ECT ECT sensor Ignition switch ON 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(No. 1) TP sensor (No. 1) Ignition switch ON CTP Approx. 0.6
  • TP sensor
  • Related wiring harness
WOT Approx. 4.4
2AL TP (No. 2) TP sensor (No. 2) Ignition switch ON CTP Approx. 4.4
  • TP sensor
  • Related wiring harness
WOT Approx. 0.6
2AM Constant voltage (Vref) CMP sensor Ignition switch ON B+
  • Related wiring harness
2AN - - - - -
2AO Constant voltage (Vref) TP sensor Under any condition Approx. 5.0
  • Related wiring harness
2AP Sensor ground TP sensor under any condition Below 1.0
  • Related wiring harness
2AQ Constant voltage (Vref) CKP sensor Ignition switch ON B+
  • Related wiring harness
2AR - - - - -
2AS(3) HO2S GND HO2S Under any condition Below 1.0
  • Related wiring harness
2AT EGR valve #3 coil control EGR valve Idle B+
  • EGR valve
  • Related wiring harness
2AU Constant voltage (Vref) MAP sensor Ignition switch ON B+
  • Related wiring harness
2AV Sensor ground ECT sensor, MAP sensor, HO2S, variable tumble shutter valve switch under any condition Below 1.0
  • Related wiring harness
2AW EGR valve #4 coil control EGR valve Idle B+
  • EGR valve
  • Related wiring harness
2AX EGR valve #1 coil 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 #2 coil 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) Ignition switch ON 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(3) OCV control OCV Ignition switch ON B+
  • OCV
  • Related wiring harness
2BH - - - - -
(1) MTX
(2) TYPE A
(3) TYPE B
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