2005 Mazda MX-5 Miata Base, AutomaticFACTORY OEM SERVICE PROCEDURE

Using SST (WDS or Equivalent): BP

PCM TERMINALS REFERENCE (BP)

Monitor item (Definition) Unit/Condition Condition/Specification (Reference) ACTION PCM terminal
ACCS (A/C relay) ON/OFF A/C operating: ON
Ignition switch ON: OFF
  • Inspect following PIDs: RPM, TP, ECT, ACSW.
  • Inspect A/C relay

    (See RELAY INSPECTION )

 2K
ACSW (Refrigerant pressure switch) ON/OFF Refrigerant pressure switch and fan switch ON: ON
Refrigerant pressure switch OFF: OFF		 4F
ALTF (Generator field coil control duty value) % Ignition switch ON: 0%
Idle: 0-100%
Generator operating --> E/L ON:
Duty value rise		 3M
ALTT V (Generator output voltage) V Ignition switch ON: 1.0 V or less
Idle: Approx.14V		 4T
ARPMDES (Target engine speed) RPM Idle (after warm up and no load): 750-850 rpm --
BARO (Barometric pressure) kPa Hg Below 400 m {0.25 mile} above sea level: 99-103 kPa {29-30 inHg} 4AE
V Below 400 m {0.25 mile} above sea level: 4.1-4.3 V
With pressure gauge:
  • Vacuum reading -26.6 kPa {-200 mmHg, -7.85 inHg}: 3.0-3.4 V
 4AE
BOO (Brake switch) ON/OFF Brake pedal depressed: ON
Brake pedal released: OFF		 4B
CDCV (EVAP leak detection pump) ON/OFF Ignition switch ON: OFF
Idle: OFF		 4AH
CHRGLP (Generator warning light) ON/OFF Ignition switch ON: ON
Idle: OFF		 3U
CPP (Clutch switch) ON/OFF Clutch pedal depressed: ON
Clutch pedal released: OFF		 4I
CPP/PNP (MT) (Neutral switch) Neutral/Drive Shift position at neutral: Neutral
Others: Drive		 4H
ECT (Engine coolant temperature) °C °F ECT 20°C {68°F}: 20°C {68°F}
ECT 60°C {140°F}: 60°C {140°F}		 4P
V ECT 20°C {68°F}: 3.0-3.1 V
After warm up: Below 1.0 V		 4P
EGRCHK (EGR boost sensor solenoid valve) ON/OFF Ignition switch ON: OFF
Idle: OFF		 3D
EVAPCP (Purge solenoid valve duty value) % Ignition switch ON: 0% 3C
FAN2 (Condenser fan control) ON/OFF Condenser fan operating (ECT above 108°C {226°F}) or terminal TEN grounded and throttle valve open or A/C relay ON: ON
Others: OFF
  • Inspect following PIDs: RPM, TP, ECT, ACSW, TEST.
  • Inspect condenser fan relay

    (See RELAY INSPECTION )

 2C
FAN3 (Cooling fan control) ON/OFF Cooling fan operating (ECT above 97°C {207°F}) or terminal TEN grounded and throttle valve open or A/C relay ON: ON
Others: OFF
  • Inspect following PIDs: RPM, TP, ECT, ACSW.
  • Inspect cooling fan relay

    (See RELAY INSPECTION )

 2B
FP (Fuel pump relay) ON/OFF Idle: ON
Cranking: ON		 2M
FTL V (Fuel tank level signal voltage) V Idle condition
  • Fuel tank full: 0.2-0.5 V
  • Fuel tank empty: 3.4-4.4 V
  • Fuel tank half: 1.8-2.8 V
NOTE:
  • The voltages above will be measured when the battery voltage is between 12 V and 14 V.
 4AD
FUELPW1 (Fuel injection duration) ms Ignition switch ON: 0 ms
Idle: 1.5-4.0 ms		 2A, 2D, 2G, 2J
HTR11 (Heated oxygen sensor heater (Front)) ON/OFF Always: ON 3J
HTR12 (Heated oxygen sensor heater (Rear)) ON/OFF ECT above 70°C {158°F}: ON
ECT below 70°C {158°F}: OFF		 3P
IAC (Idle air control valve) % Idle: Approx.30% 2P, 2Q
IAT (Intake air temperature) °C °F IAT 20°C {68°F}: 20°C {68°F} 4N
V IAT 20°C {68°F}: 2.3-2.4 V
IAT 30°C {86°F}: 1.9 V		 4N
IMRC (VTCS solenoid valve) ON/OFF ECT below 60°C {140°F} while idling: ON 2N
IMRCM (VTCS vacuum switch) ON/OFF ECT below 60°C {140°F} while idling: ON 4J
KNOCKR (Knocking retard) ° Ignition switch ON: 0°
Idle: 0°		 4M
LOAD (Calculated engine load) % Idle: 15.0-23.0% (MT), 14.0-23.0 (AT) Indicator engine load --
LONGFT1 (Current long term fuel trim adjustment) % Idle: -20-20% --
MAF (Intake MAF) g/s lb/min Idle: 2.6-3.3 g/s {0.3-0.4 lb/min} (MT), 2.4-3.4 g/s {0.3-0.4 lb/min} (AT) 4X
V Ignition switch ON: 0.9-2.0 V
Idle: 1.7-2.4 V		 4X
MIL (Malfunction indicator lamp) ON/OFF Ignition switch ON: ON
DTC output: ON
No DTC output: OFF		 2R
MTSW (MA/AT discrimination signal) 1/0 MT: 1
AT: 0		 -- 4I
O2S11 (Heated oxygen sensor (Front)) V Ignition switch ON: 0-1.0 V
After warm up: 0-1.0 V
Acceleration: 0.5-1.0 V
Deceleration: 0-0.5 V		 4W
O2S12 (Heated oxygen sensor (Rear)) V Ignition switch ON: 0-1.0 V
Idle (After warm up): 0-1.0 V
Idle (Engine cold): 0-0.5 V
Accelerate: 0.5-1.0 V
Decelerate: 0-0.5 V		 4AA
PSP (PSP switch) High/Low Steering wheel is at straight ahead position: Low
Steering wheel is fully turned: High		 4C
RFCFLAG (Fuel learning correction set flag) ON/OFF Adaptive memory exists: ON
No adaptive memory: OFF		 -- --
RPM (Engine speed) RPM Idle (After warm up and no load): 750-850 rpm 3Y
SEGRP (EGR valve (stepping motor) position) step Ignition switch ON: 0 step
Idle: 0 step
Cranking: 0-60 steps		 2E, 2F, 2H, 2I
SHRTFT1 (Short term trim) % Idle: -25-25% --
SORK TIME (Engine sork time) MIN -- -- --
SPARKADV (Ignition timing) ° Idle: BTDC 6-18°
Idle (Terminal TEN GND): BTDC
9-11°
Cranking: Approx.6°
  • Inspect following PIDs: MAF, IAT, RPM, TP, ECT, PSP, PNP, CPP, ACSW, TEST, CMP sensor.
  • Perform engine tune-up

    (See ENGINE TUNE-UP )

 3V
Test (TEN terminal (DLC)) ON/OFF Open terminal TEN: OFF
Shorted terminal TEN: ON
  • Inspect the DLC TEN terminal and PCM connector terminal 4E
 4E
TP (Throttle position sensor signal voltage) V Closed TP: 0.1-1.1 V
WOT: 3.0-4.6 V		 4V
VPWR (Battery positive voltage) V Ignition switch ON: B+ 4AF
VSS (Vehicle speed) KPH MPH Vehicle speed 20 km/h {12.5 mph}: 20 km/h {12.5 mph}
Vehicle speed 40 km/h {25 mph}: 40 km/h {25 mph}		 3T
VT ACT (Actual valve timing) ° 4,500-5,000 rpm: 20° - 15° 4D, 4R
VT TGT (Target valve timing) ° 4,500-5,000 rpm: 20° - 15° --
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  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
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