Mazda 3 Service Manual: PCM Inspection [Mzr 2.0, Mzr 2.5]

Monitor item (Definition)

Unit/Condition

Condition/Specification (Reference)

Inspection item

PCM terminal

AAT

(Ambient air temperature)

°C

°F

Indicates the ambient air temperature

IAT sensor

1AT

AC_REQ

(A/C request signal)

OFF/ON

A/C switch OFF: OFF

A/C switch ON: ON

Perform applicable

DTC troubleshooting

—

ACCS

(A/C relay)

OFF/ON

A/C relay OFF: OFF

A/C relay ON: ON

A/C relay

Inspect following PIDs: RPM, TP REL, ECT.

1I

AFR

(Target air fuel ratio)

—

Target air fuel ratio is displayed

A/F sensor

2Z

2AC

2AD

AFR_ACT

(Actual air fuel ratio)

—

Actual air fuel ratio is displayed

A/F sensor

2Z

2AC

2AD

ALTF

(Generator field coil control duty value)

%

Just after A/C switch ON and fan switch ON at idle: Duty value rises

Generator

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

2AA

ALTT V

(Generator output voltage)

V

Switch the ignition to ON: 0 V

Idle: approx. 14 V*1 (E/L not operating)

Generator

2AF

APP

(APP sensor)

%

• Accelerator pedal released: approx. 0 %

• Accelerator pedal depressed: approx. 100 %

APP sensor

1X

1AP

APP 1

(APP sensor No.1)

%

• Accelerator pedal released: approx. 15 %

• Accelerator pedal depressed: approx. 80 %

APP sensor

1AP

V

• Accelerator pedal released: approx. 0.4 V

• Accelerator pedal depressed: approx. 3.3 V

APP 2

(APP sensor No.2)

%

• Accelerator pedal released: approx. 7.5 %

• Accelerator pedal depressed: approx. 42 %

APP sensor

1X

V

• Accelerator pedal released: approx. 0.4 V

• Accelerator pedal depressed: approx. 2.0 V

ARPMDES

(Target engine speed)

RPM

• Indicate the target engine speed

Inspect following PIDs: IAT, RPM, MAP, ECT, MAF, TP REL, INGEAR, ALTT V.

—

BARO

(Barometric pressure)

kPa, psi, Bar

Indicate the BARO

BARO sensor

—

V

• Switch the ignition to ON (at sea level): approx. 4.1 V

BOO

(Brake switch)

OFF/ON

Brake pedal depressed: ON

Brake pedal released: OFF

Brake switch No.1

1AB

BPA

(Brake pressure applied switch)

OFF/ON

Brake pedal depressed: ON

Brake pedal released: OFF

Brake switch No.2

—

CATT11_DSD

(Desired catalyst temperature bank one, sensor one)

°C

Indicate the estimated catalytic converter temperature

Perform applicable DTC troubleshooting.

—

CHRGLP

(Generator warning light)

OFF/ON

Switch the ignition to ON: ON

Idle: OFF

Perform applicable DTC troubleshooting.

—

COLP

(Refrigerant pressure sensor)

OFF/ON

Refrigerant pressure is above 1.96 Mpa {20.0kgf/cm2, 284 psi}: ON

Refrigerant pressure sensor

—

CPP*2

(Clutch pedal position)

OFF/ON

Clutch pedal depressed: ON

Clutch pedal released: OFF

CPP switch

1BD

CPP/PNP*2

(Shift lever position)

OFF/ON

Neutral position: ON

Others: OFF

Neutral switch

1BC

ECT

(Engine coolant temperature No.1)

°C

°F

Indicate the ECT No.1

ECT sensor No.1

2AH

V

ECT 20 °C {68 °F}: 3.04—3.14 V

ECT 80 °C {176 °F}: 0.76—0.83 V

ECT2

(Engine coolant temperature No.2)

°C

°F

Indicate the ECT No.2

ECT sensor No.2

2AO

V

ECT 20 °C {68 °F}: 3.04—3.14 V

ECT 80 °C {176 °F}: 0.76—0.83 V

EQ_RAT11

(Equivalence ratio (lambda))

—

Idling after warm-up: approx. 1

Perform applicable DTC troubleshooting.

2Z

2AC

2AD

EQ_RAT11_DSD

(Desired equivalence ratio (lambda))

—

Idling after warm-up: approx. 1

Perform applicable DTC troubleshooting.

—

ETC_ACT

(Electronic throttle control actual)

°

Indicate the desired TP by angle

Perform applicable DTC troubleshooting.

2BE, 2BF

ETC_DSD

(Electronic throttle control desired)

%

Indicate the desired TP by percent

TP sensor

Inspect following PIDs:APP1, APP2, ETC_ACT.

—

°

Indicate the desired TP by angle

EVAPCP

(Purge solenoid valve duty value)

%

Switch the ignition to ON: 0%

Idle: 0%

Inspect following PIDs: IAT, RPM, ECT, MAF, O2S11, INGEAR, VPWR.

1BA

EVAPCV

(Evaporative emission canister vent valve)

OFF/ON

Simulation item (EVAPCV) is ON: ON

CV solenoid valve

1M

FAN_DUTY

(Fan control module)

%

• When all of following condition are met: 50%

• Test mode ON

• WOT

Fan control module

1R

FCL

(Fuel cap warning light)

OFF/ON

• Fuel cap warning light not illuminated: OFF

• Fuel cap warning light illuminated: ON

Perform applicable DTC troubleshooting.

—

FLI

(Fuel level)

%

• Fuel gauge level F: approx. 100%

• Fuel gauge level E: approx. 0%

Perform applicable DTC troubleshooting.

—

FP

(Fuel pump relay)

OFF/ON

Switch the ignition to ON: OFF

Idle: ON

Cranking: ON

Fuel pump relay

Inspect following PIDs: RPM.

1BG

FTP

(Fuel tank pressure sensor)

kPa, psi, Bar

Indicate the fuel tank pressure

Fuel tank pressure sensor

1AH

V

Fuel tank pressure is equal to barometric pressure: approx. 2.625 V

FUELPW

(Fuel injector duration)

sec

Idle (after warm up): approx. 2.2 ms

Fuel injector

Inspect following PIDs: IAT, MAF, TP REL, MAP, ECT, RPM, O2S11, O2S12, INGEAR, VPWR, ALTT V.

2AZ

2BB

2BC

2BD

FUELSYS

(Fuel system status)

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

Idle (after warm up): CL

Fuel injector

Inspect following PIDs: IAT, MAF, TP REL, MAP, ECT, RPM, O2S11, O2S12, INGEAR, VPWR, ALTT V.

—

HTR11

(A/F sensor heater)

OFF/ON

Idle (after warm up): ON⇔OFF

A/F sensor

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

2A

HTR12

(HO2S heater)

OFF/ON

Idle (after warm up): ON⇔OFF

HO2S heater

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

2B

IAT

(Intake air temperature)

°C

°F

Indicate the IAT

IAT sensor

1AC

V

IAT 20 °C {68 °F}: approx. 2.38 V

IAT 60 °C {140 °F}: approx. 0.89 V

IMRC

(Variable tumble solenoid valve)

OFF/ON

• ECT below 60 °C {140 °F} (MZR 2.0) / 63 °C {145 °F} (MZR 2.5) and engine speed below 3,750 rpm : On

• ECT above 60 °C {140 °F} (MZR 2.0) / 63 °C {145 °F} (MZR 2.5) while idling.: Off

Variable tumble solenoid valve

Inspect following PIDs: TP REL, ECT, RPM.

2I

IMRC_POS

(Variable tumble shutter valve switch)

V

• ECT below 60 °C {140 °F} (MZR 2.0) / 63 °C {145 °F} (MZR 2.5) and engine speed below 3,750 rpm : 3.408—4.432 V

• ECT above 60 °C {140 °F} (MZR 2.0) / 63 °C {145 °F} (MZR 2.5) while idling.: 0.808—1.832 V

Variable tumble shutter valve switch

2R

IMTV

(Variable Intake air control solenoid valve)

OFF/ON

Engine speed is below approx. 4,400 rpm (MZR 2.0) / 4,600rpm (MZR 2.5): On

Others: Off

Variable intake air control solenoid valve

Inspect following PIDs: RPM.

2J

INGEAR

(Load/no load condition)

OFF/ON

MTX

• When the following conditions are satisfied: On

• Other than neutral

• Clutch pedal released

• Except above: Off

CPP switch

Neutral switch

1BC

IBD

ATX

• Driving range: On

• Except above: Off

TR switch

—

ISC_FBK

(ISC feedback value)

—

ISC feedback value is displayed

PCM

—

ISC_FBK_LRN

(ISC feedback learning value)

—

ISC feedback learning value is displayed.

PCM

—

IVS

(CTP condition)

Idle/Off_Idle

• CTP: Idle

• Others: Off Idle

Perform applicable DTC troubleshooting.

—

KNOCKR

(Knocking retard)

°

Switch the ignition to ON: 0°

Idle: 0°

KS

2U

2V

LOAD

(Engine load)

%

Switch the ignition to ON: 0%

Idle (after warm up): approx.15%

Inspect following PIDs: MAP, IAT, MAF, RPM.

—

LONGFT1

(long term fuel trim (A/F sensor))

%

Idle (after warm up): –15—20%

Perform applicable DTC troubleshooting.

—

LONGFT12

(long term fuel trim (HO2S))

%

Indicate the fuel learning correction amount (HO2S)

Perform applicable DTC troubleshooting.

—

MAF

(Mass airflow)

g/sec

Indicate the MAF

MAF sensor

1AK

V

Switch the ignition to ON: approx. 0.7 V

Idle (after warm up): approx. 1.2 V

MAP

(Manifold absolute pressure)

kPa, psi, Bar

Indicate the MAP

MAP sensor

2AG

V

• Switch the ignition to ON (at sea level): approx. 4.1 V

• Idle: approx. 1.2 V

MIL

(Malfunction indicator lamp)

OFF/ON

• DTC stored: On

• DTC not stored: Off

Perform applicable DTC troubleshooting.

—

MIL_DIS

(Travelled distance since the MIL illuminated)

km

miles

Indicate the travelled distance since the MIL illuminated

O2S11

(A/F sensor)

A

Idle (After warm up): approx. 0 mA

A/F sensor

2Z

2AC

2AD

O2S12

(HO2S)

V

Idle (After warm up): 0—1.0 V

HO2S

2Q

RO2FT1

(HO2S fuel trim)

%

Idle (after warm up): approx. –0.03—0.03

Perform applicable DTC troubleshooting.

—

RPM

(Engine speed)

RPM

Indicate the engine speed

CKP sensor

2W

SC_CANCEL*3

(CANCEL switch)

Inactive/Active

CANCEL switch pressed in: Active

Except above: Inactive

Cruise control switch

1AQ

SC_OFF*3

(ON/OFF switch)

Inactive/Active

ON/OFF switch pressed in (OFF): Active

Except above: Inactive

Cruise control switch

1AQ

SC_ON*3

(ON/OFF switch)

Inactive/Active

ON/OFF switch pressed in (ON): Active

Except above: Inactive

Cruise control switch

1AQ

SC_RES*3

(RESUME switch)

Inactive/Active

RESUME switch pressed in: Active

Except above: Inactive

Cruise control switch

1AQ

SC_SET-*3

(SET(-) switch)

Inactive/Active

SET(-) switch pressed in: Active

Except above: Inactive

Cruise control switch

1AQ

SC_SET+*3

(SET(+) switch)

Inactive/Active

SET(+) switch pressed in: Active

Except above: Inactive

Cruise control switch

1AQ

SCCS*3

(Cruise control switch)

V

ON/OFF switch pressed in (OFF): approx. 0 V

CANCEL switch pressed in: approx. 1.3 V

SET(-) switch pressed in: approx. 2.4 V

SET(+) switch pressed in: approx. 3.2 V

RESUME switch pressed in: approx. 3.9 V

ON/OFF switch pressed in (ON): approx. 4.3 V

Cruise control switch

1AQ

SEGRP

(EGR valve (stepping motor) position)

—

Switch the ignition to ON: 0

Idle: 0 step

Cranking: 0—52

EGR valve

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

2AT, 2AX, 2AW, 2BA

SEGRP DSD

(Desired EGR valve position)

%

Indicate the desired EGR valve position

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

—

SHRTFT1

(Short term fuel trim (A/F sensor))

%

Idle (after warm up): approx.–25—25%

Perform applicable DTC troubleshooting.

—

SHRTFT12

(Short term fuel trim (HO2S))

%

Indicate the fuel feedback correction amount (HO2S)

Perform applicable DTC troubleshooting.

—

SPARKADV

(Ignition timing)

°

Indicate the ignition timing

Inspect following PIDs: MAF, TP REL, ECT, RPM, INGEAR, VPWR.

2G,

2H,

2K,

2L

Test

(Test mode)

OFF/ON

Test mode ON: On

Test mode OFF: Off

—

—

THM_1 (Thermostat monitor engine coolant temperature No.1)

°C

°F

Indicates engine coolant temperature No.1 when thermostat monitoring is finished

Thermostat

—

THM_2 (Thermostat monitor engine coolant temperature No.2)

°C

°F

Indicates engine coolant temperature No.2 when thermostat monitoring is finished

Thermostat

—

THM_MAX_2 (Thermostat monitor engine coolant temperature No.2 max limit)

°C

°F

Indicates upper limit of engine coolant temperature No.2 for thermostat monitoring execution

Thermostat

—

THM_MIN_1 (Thermostat monitor engine coolant temperature No.1 min limit)

°C

°F

Indicates lower limit of engine coolant temperature No.1 for thermostat monitoring execution

Thermostat

—

THM_MIN_2 (Thermostat monitor engine coolant temperature No.2 min limit)

°C

°F

Indicates lower limit of engine coolant temperature No.2 for thermostat monitoring execution

Thermostat

—

TP REL

(Relative throttle position)

%

Accelerator pedal released: approx. 3%

Accelerator pedal depressed: approx. 75%

TP sensor

2AK

2AL

TP 1

(TP sensor No.1)

%

Accelerator pedal released: approx. 12%

Accelerator pedal depressed: approx. 84%

TP sensor

2AK

V

Accelerator pedal released: approx. 0.7 V

Accelerator pedal depressed: approx. 4.4 V

TP 2

(TP sensor No.2)

%

Accelerator pedal released: approx. 12%

Accelerator pedal depressed: approx. 84%

TP sensor

2AL

V

Accelerator pedal released: approx. 4.3 V

Accelerator pedal depressed: approx. 0.6 V

TPCT

(TP sensor voltage at CTP)

V

approx. 0.5 V

TP sensor

2AK

2AL

VPWR

(Battery positive voltage)

V

Switch the ignition to ON: B+

Battery

1C

VSS

(Vehicle speed)

KPH

Indicate the vehicle speed

Perform applicable DTC troubleshooting.

—

VT ACT1

(Actual valve timing)

°

Idle: approx. 0°

Racing after warm up: 0—25°

CMP sensor

2S

VT DIFF1

(Difference between target and actual valve timing)

°

Idle: approx. 0°

CMP sensor

OCV

Inspect following PIDs: TP REL, ECT, RPM.

2E

2S

VT DUTY1

(Oil control valve duty value)

%

Idle: approx. 11.5%

OCV

Inspect following PIDs: TP REL, ECT, RPM.

2E

Terminal

Signal

Connected to

Test condition

Voltage (V)

inspection item

1A

Power supply

Main relay

Switch the ignition to off

Below 1.0

• Related wiring harness

Switch the ignition to ON

B+

1B

Power supply

Main relay

Switch the ignition to off

Below 1.0

• Related wiring harness

Switch the ignition to ON

B+

1C

Back-up power supply

Battery

(positive terminal)

Switch the ignition to ON

B+

• Battery

• Related wiring harness

1D

—

—

—

—

—

1E

GND

Ground

Under any condition

Below 1.0

• Related wiring harness

1F

GND

Ground

Under any condition