Pcm Inspection: Notes

Connect the WDS or equivalent to the DLC-2.
Turn the ignition switch to ON position.
Measure the PID value.
- If PID value is not within the specification, follow the instructions in Action column.
  
  Fig 1: Locating DLC-2 Connector
  Courtesy of MAZDA MOTORS CORP.

PID/DATA MONITOR table (Reference)

PID/DATA MONITOR REFERENCE

Monitor item (Definition)

Unit/Condition

Condition/Specification (Reference)

Inspection item (s)

PCM terminal

AAT
(Ambient air temperature)

°C or °F

Ignition switch at ON position:
Indicate the ambient air temperature

IAT sensor
(See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION ).

AC REQ (A/C switch)

On/Off

A/C switch and fan switch ON at ignition switch ON: On A/C switch OFF at ignition switch ON: Off

A/C switch
(See CLIMATE CONTROL UNIT INSPECTION [L3, AJ] ).
Refrigerant pressure switch
(See REFRIGERANT PRESSURE CHECK [L3, AJ] ).

1AN

ACCS (A/C relay)

On/Off

A/C is operating: On
Ignition switch is ON: Off

Inspect following PIDs: ECT, RPM, TP REL
A/C switch
(See CLIMATE CONTROL UNIT INSPECTION [L3, AJ] ).

1AW

ALTF (Generator field coil control duty value)

Ignition switch is ON: 0% Idling, E/L is operating: Duty value rises

Inspect following PIDs: ALTT V, ECT, IAT, RPM

2AP

ALTT V (Generator output voltage)

Ignition switch is ON: 0 V
Idling: 14-16 V

Generator
(See GENERATOR INSPECTION [L3, AJ] ).

2AU

APP (Accelerator pedal position)

CTP: Approx. 0%
WOT: Approx. 99.2%

Inspect following PIDs: APP1, APP2
APP sensor
(See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION ).

1AP, 1AO

APP1 (APP sensor No.1)

AP is released: 31.0-32.4%
AP is depressed: 69.8-81.8%

APP sensor
(See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION ).

1AO

AP is released: 1.55-1.62 V
AP is depressed: 3.49-4.09 V

APP2 (APP sensor No.2)

AP is released: 20.2-21.4%
AP is depressed: 58.8-70.8%

APP sensor
(See ACCELERATOR PEDAL POSITION (APP) SENSOR INSPECTION ).

1AP

AP is released: 1.01-1.07 V
AP is depressed: 2.94-3.54 V

ARPMDES (Target engine speed)

RPM

Idling (no load): 700-800 RPM

Inspect following PIDs: ALTT V, ECT, IAT, INGEAR, MAF, MAP, RPM, PSP, TP REL
CKP sensor
(See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION ).

BARO (Barometric pressure)

kPa, Bar, psi

Ignition switch is ON at sea level: Approx. 101 kPa {1.01 Bar, 14.6 psi}

EGR boost sensor
(See EGR BOOST SENSOR INSPECTION ).

1AL

Ignition switch is ON at sea level: Approx. 4.1 V

BARO/EGR (EGR boost sensor solenoid valve)

On/Off

Ignition switch is ON:
Off Idling: Off

EGR boost sensor solenoid valve
(See EGR BOOST SENSOR SOLENOID VALVE INSPECTION [AJ] ).

1AX

BOO (Brake switch No.1)

On/Off

Brake pedal is depressed: On
Brake pedal is released: Off

Brake switch
(See BRAKE SWITCH INSPECTION ).

1AJ

BPA (Brake switch No.2)

On/Off

Brake pedal is depressed: Off
Brake pedal is released: On

Brake switch
(See BRAKE SWITCH INSPECTION ).

1AF

CATT11_DSD
(Estimated catalytic converter temperature)

°C or °F

Idling after warm-up: indicate the WU-TWC (RH) forecast temperature

Perform applicable DTC troubleshooting
(See DTC TABLE ).

CATT21_DSD
(Estimated catalytic converter temperature)

°C or °F

Idling after warm-up: indicate the WU-TWC (LH) forecast temperature

Perform applicable DTC troubleshooting
(See DTC TABLE ).

CHRGLP (Generator warning light)

On/Off

Ignition switch is ON: On
Idling: Off

Perform applicable DTC troubleshooting
(See DTC TABLE ).

COLP (Refrigerant pressure switch - middle)

On/Off

Idling, refrigerant pressure switch (middle) is on: On
Idling, refrigerant pressure switch (middle) is off: Off

Refrigerant pressure switch
(See REFRIGERANT PRESSURE CHECK [L3, AJ] ).

1AH

CPP⁽¹⁾
(Clutch pedal position)

On/Off

Clutch pedal is depressed: On
Clutch pedal is released: Off

Clutch switch
(See CLUTCH PEDAL POSITION (CPP) SWITCH INSPECTION ).

1AB

CPP/PNP⁽¹⁾
(Shift lever position)

Neutral/Drive

Gear is neutral position: Neutral
Gear is not neutral position: Drive

Neutral switch
(See NEUTRAL SWITCH INSPECTION ).

DTCCNT
(Number of DTC detected)

Perform applicable DTC troubleshooting.
(See DTC TABLE ).

ECT
(Engine coolant temperature)

°C or °F

Indicate the engine coolant temperature

ECT sensor
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION ).

2AQ

ECT is 20°C {68°F}: 2.9-3.1 V After warm-up: 0.2-1.0 V

EQ_RAT11_DSD (Front oxygen sensor)

Idling after warm-up: Approx. 1

Perform applicable DTC troubleshooting
(See DTC TABLE ).

ETC_ACT
(Electronic throttle control actual)

Accelerator pedal is released: Approx. 7.4°
Accelerator pedal is released: Approx. 74.3°

TP sensor
(See THROTTLE POSITION (TP) SENSOR INSPECTION ).

2AI, 2AM

ETC_DSD
(Electronic throttle control desired)

Throttle valve is closed --> open: PID value changes smoothly

Inspect following PIDs: APP1, APP2, ETC ACT
TP sensor
(See THROTTLE POSITION (TP) SENSOR INSPECTION ).

2AI, 2AM

Accelerator pedal is released: Approx. 0°
Accelerator pedal is released: Approx. 74°

EVAPCP
(Purge solenoid valve duty value)

Ignition switch is ON: 0%

Inspect following PIDs: BARO, ECT, IAT, MAF, O2S11, O2S21, RPM, TP REL

1BF

FAN_DUTY
(Fan control signal)

ECT is below 100°C {212°F}: 0%
ECT is above 100°C {212°F}:
50-100%

Inspect following PIDs: COLP, ECT

FLI (Fuel level)

FP
(Fuel pump relay)

On/Off

Ignition switch is ON: Off
Idling: On
Cranking: On

Inspect following PID: RPM
Fuel pump relay
(See RELAY INSPECTION ).

FUELPW
(Fuel injection duration)

Ignition switch is ON: 0 ms
Idling: 1.5-3.0 ms

Inspect following PIDs: ACSW, ALTT V, ECT, IAT, INGEAR, MAF, MAP, O2S11, O2S12, O2S21, O2S22, PSP, RPM, TP REL, VBAT
Fuel injector
(See FUEL INJECTOR INSPECTION [AJ] ).

2G, 2E, 2J, 2F, 2K 21

FUEL SYS1
(Fuel system status)

OL/CL/OL-Drive/OL-Fault/CL-Fault

Ignition switch is ON: CL
Idling after warm-up: CL

Inspect following PIDs: ALTT V, ECT, IAT, INGEAR, MAF, MAP, O2S11, 02S12, O2S21, O2S22, PSP, RPM, TP REL
Fuel injector
(See FUEL INJECTOR INSPECTION [AJ] ).

FUEL SYS2
(Fuel system status)

OL/CL/OL-Drive/OL-Fault/CL-Fault

Ignition switch is ON: CL
Idling after warm-up: CL

Inspect following PIDs: ALTT V, ECT, IAT, INGEAR, MAF, MAP, O2S11, O2S12, O2S21, O2S22, PSP, RPM, TP REL
Fuel injector
(See FUEL INJECTOR INSPECTION [AJ] ).

GENVDSD
(Generator voltage desired)

Ignition switch is ON: 0 V
Idling, E/L is not operating:
Approx. 14.9 V

Perform applicable DTC troubleshooting
(See DTC TABLE ).

HTR11
(HO2S heater - RF)

On/Off

Idle after warm-up: On and Off

Inspect following PIDs: ECT, MAF, RPM, TP REL

2AW

HTR12
(HO2S heater - RR)

On/Off

Idling: On
Engine speed is above 4,000 RPM: Off

Inspect following PIDs: ECT, MAF, RPM, TP REL

2AT

HTR21
(HO2S heater - LF)

On/Off

Idle after warm-up: On and Off

Inspect following PIDs: ECT, MAF, RPM, TP REL

2AS

HTR22
(HO2S heater - LR)

On/Off

Idling: On
Engine speed is above 4,000 RPM: Off

Inspect following PIDs: ECT, MAF, RPM, TP REL

2AO

IASV
(VAD control solenoid valve)

On/Off

TP opening angle is less than 60% and engine speed is 6,000 RPM or above: On
TP opening angle is 60% or above and engine speed is 4,800 RPM or above: On
Others: Off

Inspect following PIDs: ECT, RPM, TP REL

1BB

IAT
(Intake air temperature)

°C or °F

Indicate the intake-air temperature

IAT sensor
(See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION ).

1AT

IAT is 20°C {68°F}: 2.4-2.6 V
IAT is 30°C {86°F}: 1.7-1.9 V

INGEAR⁽¹⁾
(Load/no load condition)

On/Off

Gear is not neutral position and clutch pedal is released: On
Gear is neutral position: Off
Clutch pedal is depressed: Off

Inspect following PIDs: CPP, CPP/PNP
Perform applicable DTC troubleshooting.
(See DTC TABLE ).

1AB, 2X

IVS
(CTP condition)

Idle/Off Idle

CTP: Idle
Others: Off Idle

Perform applicable DTC troubleshooting
(See DTC TABLE ).

2AI, 2AM

KNOCKR
(Knocking retard)

Ignition switch is ON: 0°
Idling: 0°

KS
(See KNOCK SENSOR (KS) INSPECTION ).

2AF, 2AC

LDP_EVAPCP
(EVAP system leak detection pump detect incorrect purge flow)

Indicate the EVAP control system incorrect purge flow detection value

Perform applicable DTC troubleshooting
(See DTC TABLE ).

LDP_IDL (EVAP system leak detection pump idle current)

Indicate the EVAP system leak detection pump idle current

Perform applicable DTC troubleshooting
(See DTC TABLE ).

LDP_MON (EVAP system leak detection pump monitoring current)

Indicate the EVAP system leak detection pump monitoring current

Perform applicable DTC troubleshooting
(See DTC TABLE ).

LDP_REF (EVAP system leak detection pump reference current)

Indicate the EVAP system leak detection pump reference current

Perform applicable DTC troubleshooting
(See DTC TABLE ).

LDP_SLDV (EVAP system small leak detection value)

Indicate the EVAP control system small leak detection value

Perform applicable DTC troubleshooting
(See DTC TABLE ).

LDP_VSL_FV⁽²⁾
(EVAP system small leak detection value)

mA/sec

Indicate the EVAP control system vary small leak detection value

Perform applicable DTC troubleshooting.
(See DTC TABLE ). -

LDP_VSL_SV⁽²⁾
(EVAP system small leak detection value)

mA/sec

Indicate the EVAP control system vary small leak detection value

Perform applicable DTC troubleshooting.
(See DTC TABLE ).

LDP_VSLDV⁽²⁾
(EVAP system small leak detection value)

mA/sec

Indicate the EVAP control system vary small leak detection value

Perform applicable DTC troubleshooting
(See DTC TABLE ).

LOAD
(Engine load)

MTX
Idling: Approx. 16.8%
Engine speed is 2,500 RPM:
Approx. 14.6%
ATX
Idling: Approx. 17.5%
Engine speed is 2,500 RPM:
Approx. 15.2%

Inspect following PIDs: ECT, IAT, MAF, MAP, RPM, TP REL

LONGFT1
(Long term fuel trim - RH)

Idling: -20-20%

Perform applicable DTC troubleshooting
(See DTC TABLE ).

LONGFT2
(Long term fuel trim - LH)

Idling: -20-20%

Perform applicable DTC troubleshooting
(See DTC TABLE ).

MAF (Mass airflow)

g/s

MTX
Idling: 3.6-3.8 g/s
Engine speed is 2,500 RPM:
10.5-11.2 g/s
ATX
Idling: 3.8-4.0 g/s
Engine speed is 2,500 RPM:
10.6-11.4 g/s

MAF sensor
01-40C-32 MASS AIR FLOW (MAF) SENSOR INSPECTION [AJ]).

1AK

Idling: Approx. 1.3 V
Engine speed is 2,500 RPM:
Approx. 1.9 V

MIL
(Malfunction indicator light)

On/Off

Ignition switch is ON: On
Idling: Off

Perform applicable DTC troubleshooting
(See DTC TABLE ).

MIL_DIS (Travelled distance since the MIL illuminated)

km or mile

No DTC: 0 km {0 mile}
DTC detected: Not 0 km {0 mile}

Perform applicable DTC troubleshooting
(See DTC TABLE ).

NUMKEYS
(Number of keys stored in module)

Indicate the number of keys stored in module

O2S11 (HO2S - RF)

Idling after warm-up: 0-1.0 V
Acceleration: 0.5-1.0 V
Deceleration: 0-0.5 V

HO2S (RF)
(See HEATED OXYGEN SENSOR (HO2S) INSPECTION ).

2AK

O2S12
(HO2S - RR)

Ignition switch is ON: 0-1.0 V
Idling after warm-up: 0-1.0 V
Acceleration: 0.5-1.0 V
Deceleration: 0-0.5 V

HO2S (RR)
(See HEATED OXYGEN SENSOR (HO2S) INSPECTION ).

2AG

O2S21
(HO2S - LF)

Idling after warm-up: Approx. 0.6 V

HO2S (LF)
(See HEATED OXYGEN SENSOR (HO2S) INSPECTION ).

2AL

O2S22
(HO2S - LR)

Idling after warm-up: Approx. 0.6 V

HO2S (LR)
(See HEATED OXYGEN SENSOR (HO2S) INSPECTION ).

2AH

PSP
(PSP switch)

High/Low

Steering wheel is in straight ahead position: Low
Steering wheel is turned: High

PSP switch
(See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION ).

RFCFLAG
(Readiness Function Code)

Learnt/Not Learnt

RFC exists: Learnt
No RFC: Not Learnt

Perform DRIVE MODE 1
(See OBD-II DRIVE MODE ).

RO2FT1
(HO2S (RR) fuel trim)

Idling after warm-up: Approx. -0.03-0.03

Perform applicable DTC troubleshooting
(See DTC TABLE ).

RO2FT2
(HO2S (RL) fuel trim)

Idling after warm-up: Approx. -0.03-0.03

Perform applicable DTC troubleshooting
(See DTC TABLE ).

RPM
(Engine speed)

RPM

Idling (no load): 700-800 RPM

CKP sensor
(See CRANKSHAFT POSITION (CKP) SENSOR INSPECTION ).

2Z, 2Y

SCCS
(Cruise control switch)

Press ON/OFF: Approx. 0 V
Press CALCEL: Approx. 1.2 V
Press SET/COAST: Approx. 3.2 V
Press RES/ACCEL: Approx. 4.2 V Others: Approx. 5.0 V

Cruise control switch
(See CRUISE CONTROL SWITCH INSPECTION [L3, AJ] ).

1AS

SEGRP
(EGR valve position)

No. of step

Ignition switch is ON: 0 step
Idling: 0 step
Cranking: 0-60 steps

Inspect following PIDs: ECT, IAT, MAF, RPM, VSS
EGR valve
(See EGR VALVE INSPECTION [AJ] ).

SEGRP DSD
(Desired EGR valve position)

Ignition switch is ON: 0%
Idling: 0%
Cranking: 0-100%

Inspect following PIDs: ECT, IAT, MAF, RPM, VSS

SHRTFT1
(Short term fuel trim - RH)

Idling: -20-20%

Perform applicable DTC troubleshooting.
(See DTC TABLE ).

SHRTFT11
(Short term fuel trim - RF)

Idling: -20-20%

Perform applicable DTC troubleshooting
(See DTC TABLE ).

SHRTFT12
(Short term fuel trim - LF)

Idling: -20-20%

Perform applicable DTC troubleshooting
(See DTC TABLE ).

SHRTFT2
(Short term fuel trim - LH)

Idling: -20-20%

Perform applicable DTC troubleshooting
(See DTC TABLE ).

SHRTFT21
(Short term fuel trim - RR)

Idling: -20-20%

Perform applicable DTC troubleshooting
(See DTC TABLE ).

SHRTFT22 (Short term fuel trim - LR)

Idling: -20-20%

Perform applicable DTC troubleshooting
(See DTC TABLE ).

SPARKADV
(Ignition timing)

° (BTDC)

Ignition switch is ON: 0° (BTDC)
Idling: Approx. 10° (BTDC)

Inspect following PIDs: ALTT V, CPP, CPP/PNP, ECT, KNOCKR, MAF, PSP, RPM, TP REL, VSS
Perform engine tune-up
(See ENGINE TUNE-UP ).

test (Test mode)

On/Off

TIRESIZE (Tire revolution per mile)

rev/mile

Indicate the tire revolution per a mile

TPREL
(Relative throttle position)

Throttle valve is closed --> open:
PID value changes smoothly

TP sensor
(See THROTTLE POSITION (TP) SENSOR INSPECTION ).

2AI, 2AM

TP1
(TP sensor No.1 signal voltage)

Ignition switch is ON and accelerator pedal not depressed: 13-24%
Ignition switch is ON and WOT: Approx. 78%

TP sensor
(See THROTTLE POSITION (TP) SENSOR INSPECTION ).

2AM

Ignition switch is ON and accelerator pedal not depressed: 3.8-4.35 V
Ignition switch is ON and WOT: Approx. 1.1 V

TP2
(TP sensor No.2 signal voltage)

Ignition switch is ON and accelerator pedal not depressed: 15-36%
Ignition switch is ON and WOT: Approx. 88%

TP sensor
(See THROTTLE POSITION (TP) SENSOR INSPECTION ).

2AI

Ignition switch is ON and accelerator pedal not depressed: 0.75-1.8 V
Ignition switch is ON and WOT: Approx. 4.4 V

TPCT
(Relative throttle position)

Ignition switch is ON: 0 V

TP sensor
(See THROTTLE POSITION (TP) SENSOR INSPECTION ).

2AI, 2AM

VPWR
(Battery positive voltage)

Ignition switch is ON: B+

Battery
(See BATTERY INSPECTION [L3 WITH TC] ).

VSS
(Vehicle speed)

KPH or MPH

Vehicle speed is 20 km/h {12 mph}:20 KPH {12MPH}
Vehicle speed is 40 km/h {25 mph}: 40 KPH {25 MPH}

Perform applicable DTC troubleshooting
(See DTC TABLE ).

VT ACT1
(Actual valve timing - RH)

Idling: 0°

Inspect following PIDs: ECT, RPM, TP REL
OCV(RH)
(See OIL CONTROL VALVE (OCV) INSPECTION ).

2AE, 2AD

VT ACT2
(Actual valve timing - LH)

Idling: 0°

Inspect following PIDs: ECT, RPM, TP REL
OCV (LH)
(See OIL CONTROL VALVE (OCV) INSPECTION ).

2AB, 2AA

VT DIFF1
(Difference between actual and target valve timing - RH)

Idling: 0°

Inspect following PIDs: ECT, RPM, TP REL
OCV (RH)
(See OIL CONTROL VALVE (OCV) INSPECTION ).

2AE, 2AD

VT DIFF2
(Difference between actual and target valve timing - LH)

Idling: 0°

Inspect following PIDs: ECT, RPM, TP REL
OCV(LH)
(See OIL CONTROL VALVE (OCV) INSPECTION ).

2AB, 2AA

VT DUTY1
(OCV control signal - RH)

Idling: 0%

Inspect following PIDs: ECT, RPM, TP REL
OCV (RH)
(See OIL CONTROL VALVE (OCV) INSPECTION ).

2AE, 2AD

VT DUTY2
(OCV control signal - LH)

Idling: 0%

Inspect following PIDs: ECT, RPM, TP REL
OCV (LH)
(See OIL CONTROL VALVE (OCV) INSPECTION ).

2AB, 2AA

⁽¹⁾

MTX

⁽²⁾	California emission regulation applicable model