Mazda 6. Manual - part 128

F–48

CONTROL SYSTEM 

End Of Sie

KNOCKR (Knocking 
retard)

ANGLE

Ignition switch ON: 0 DEG
Idle: 0 DEG

Inspect knock sensor.
(See 

F–56 KNOCK SENSOR 

INSPECTION

)

2P, 2S

LOAD (Engine load)

%

Ignition switch ON: 0%
Idle (after warm up): approx.19%

Inspect MAF sensor.
(See 

F–51 MASS AIR FLOW (MAF) 

SENSOR INSPECTION

)

—

LONGFT1 (long term 
fuel trim)

%

Idle (after warm up): approx.–14—
14%

Perform applicable DTC 
troubleshooting.
(See 

F–67 DTC TABLE

)

—

MAF (Mass airflow)

g/s

Ignition switch ON: approx. 0 g/s
Idle (after warm up): 1.5 g/s

Inspect MAF sensor.
(See 

F–51 MASS AIR FLOW (MAF) 

SENSOR INSPECTION

1P

V

Ignition switch ON: approx. 0.7 V
Idle (after warm up): 1.3 V

MAP (Manifold 
absolute pressure)

Pressure

Ignition switch ON (at sea level): 
approx 101 kPa

Inspect MAP sensor.
(See 

F–52 MANIFOLD ABSOLUTE 

PRESSURE (MAP) SENSOR 
INSPECTION

)

1J

V

Ignition switch ON (at sea level): 
approx 4.1 V

MIL (Malfunction 
indicator lamp)

ON/OFF

Ignition switch ON: ON
Idle: OFF

Perform applicable DTC 
troubleshooting.
(See 

F–67 DTC TABLE

)

—

MIL_DIS (Trabelled 
distance since the MIL 
illuminated)

Distance

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

Perform applicable DTC 
troubleshooting.
(See 

F–67 DTC TABLE

)

—

O2S11 (Front oxygen 
sensor)

V

Ignition switch ON: 0—1.0 V
Idle (After warm up): 0—1.0 V
Acceleration (After warm up):
 0.5—1.0 V
Deceleration (After warm up):
 0—0.5 V

Inspect HO2S (front).
(See 

F–56 HEATED OXYGEN 

SENSOR (HO2S) INSPECTION

)

1AB

O2S12 (Rear oxygen 
sensor)

V

Idle (After warm up): approx 0.6 V

Inspect HO2S (rear).
(See 

F–56 HEATED OXYGEN 

SENSOR (HO2S) INSPECTION

)

1Y

PSP (Power steering 
pressure switch)

ON/OFF

Steering wheel in straight ahead 
position: OFF
Others: ON

Inspect PSP switch.
(See 

F–58 POWER STEERING 

PRESSURE (PSP) SWITCH 
INSPECTION

)

1Z

RFCFLAG (Readness 
function code)

ON/OFF

Before running PCM adaptive 
memory procedure drive mode: ON
After running PCM adaptive memory 
procedure drive mode: OFF

Run PCM adaptive memory 
procedure drive mode.
(See 

F–67 DTC TABLE

)

—

RO2FT1 (Rear oxygen 
sensor fuel trim)

%

Idle (after warm up): approx.–14—
14%

Perform applicable DTC 
troubleshooting.
(See 

F–67 DTC TABLE

)

—

RPM (Engine speed)

rpm

L8

No load: 650—750 rpm
E/L operating: 650—750 rpm
P/S operating: 700—800 rpm
A/C ON: 700—800 rpm

LF MTX and L3 MTX

No load: 600—700 rpm
E/L operating: 650—750 rpm
P/S operating: 650—750 rpm
A/C ON: 700—800 rpm

LF ATX

No load: 650—750 rpm
E/L operating: 650—750 rpm
P/S operating: 650—750 rpm
A/C ON: 650—750 rpm*

2

, 700—

800 rpm*

3

Inspect CKP sensor.
(See 

F–54 CRANKSHAFT POSITION 

(CKP) SENSOR INSPECTION

)

2D, 2G

Monitor item 

(Definition)

Unit/

Condition

Condition/Specification 

(Reference)

Action

PCM 

terminal

CONTROL SYSTEM 

F–48–1

F

F–48FUEL AND EMISSION CONTROL SYSTEMS

PCM INSPECTION

A6E394018880W02A

*

1

: Calculated value; differs from terminal voltage

*

2

: Refrigerant pressure switch (middle) turns on when the refrigerant pressure is 1.69—1.84 MPa {17.3—18.7 

kgf/cm2, 247—265 psi}

*

3

: Refrigerant pressure switch (middle) turns off when the refrigerant pressure is 1.26—1.49 MPa {12.9—15.1 

kgf/cm2, 184—214 psi}

*

4

: L3 and L8, LF (Intensely hot area) models

*

5

: Immobilizer system equipped

*

6

: Immobilizer system not equipped

• Following PIDs are for the ATX models. If inspects for following PIDs, see 

K–110 PID/DATA MONITOR 

INSPECTION

.

PIDs for the ATX models
— GEAR
— LINEDES
— LPS
— OP_SW_B
— SSA/SS1
— SSB/SS2
— SSC/SS3
— TCS
— TFT
— TFTV
— THOP
— TR
— TR_SENS
— TSS

CONTROL SYSTEM

Monitor item 

(Definition)

Unit/

Condition

Condition/Specification 

(Reference)

Action

PCM 

terminal

SHRTFT1 (Short term 
fuel trim)

%

Idle (after warm up): approx.–30—
25%

Perform applicable DTC 
troubleshooting.
(See 

F–67 DTC TABLE

)

—

SPARKADV (Ignition 
timing)

BTC

Ignition switch ON: BTDC 0

°

Idle: BTDC approx. 10

°

Inspect following PIDs: MAF, TP, 
ECT, RPM, INGEAR, TR, PSP, 
ACSW, VPWR.
Inspect ignition timing.
(See 

F–8 IGNITION TIMING 

INSPECTION

)

2J

2M

TEST (Test mode)

ON/OFF

—

—

—

TP (TP)

%

CTP: 13—23%
WOT: 86—96%

Inspect TP sensor.
(See 

F–51 THROTTLE POSITION 

(TP) SENSOR INSPECTION

)

2A

V

CTP: 0.65—1.15 V
WOT: 4.3—4.8 V

TPCT
(TP sensor voltage at 
CTP )

V

0.65—1.15 V

Inspect TP sensor.
(See 

F–51 THROTTLE POSITION 

(TP) SENSOR INSPECTION

)

2A

VPWR (Battery positive 
voltage)

V

Ignition switch ON: B+

Inspect main relay.
(See 

T–24 RELAY INSPECTION

)

Inspect battery.
(See 

G–4 BATTERY INSPECTION

)

2Y, 2Z

VSS (Vehicle speed)

km/h

MPH

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

Perform applicable DTC 
troubleshooting.
(See 

F–67 DTC TABLE

)

—

VT DUTY1

ANGLE

Idle: 0

°

Inspect following PIDs: TP, ECT, 
RPM.
Inspect OCV.
(See 

B–33 OIL CONTROL VALVE 

(OCV) INSPECTION

)

2I, 2L

%

Idle: 0%

CONTROL SYSTEM 

F–48–2

Without Using the SST

Caution

• The PCM terminal voltages vary with change in measuring conditions and vehicle conditions. 

Always carry out a total inspection of the input systems, output systems, and PCM to determine 
the cause of trouble. Otherwise, a wrong diagnosis will be made.

1. Measure the voltage at each terminal.

• If any incorrect voltage is detected, inspect the related system(s), wiring harnesses and connector(s) 

referring to the Action column in the terminal voltage table.

Terminal voltage table (Reference)

Terminal

Signal

Connected to

Test condition

Voltage 

(V)

Action

1A

IGT1

Ignition coil (No. 1, 
4 cylinders)

• Inspect using the wave profile.

(See 

F–48–10 Inspection Using An 

Oscilloscope (Reference)

.)

• Inspect ignition coil

(See 

G–9 IGNITION 

COIL INSPECTION

)

• Inspect related 

harness

1B

IGT2

Ignition coil (No. 2, 
3 cylinders)

• Inspect using the wave profile.

(See 

F–48–10 Inspection Using An 

Oscilloscope (Reference)

.)

• Inspect ignition coil

(See 

G–9 IGNITION 

COIL INSPECTION

)

• Inspect related 

harness

1C

GND

GND

Under any condition

Below 1.0

• Inspect related 

harness

1D

GND

GND

Under any condition

Below 1.0

• Inspect related 

harness

1E

—

—

—

—

—

1F

—

—

—

—

—

1G

Atmospheric 
pressure

BARO sensor

Ignition switch ON (Engine OFF 
at sea level)

Approx. 

4.0

• Inspect BARO sensor

(See 

F–60 

BAROMETRIC 
PRESSURE (BARO) 
SENSOR 
INSPECTION

)

• Inspect related 

harness

Ignition switch OFF

Below 1.0

1H

—

—

—

—

—

1I

—

—

—

—

—

1J

Manifold absolute 
pressure

MAP sensor

Ignition switch ON (Engine OFF 
at sea level)

Approx. 

4.1

• Inspect MAP sensor

(See 

F–52 

MANIFOLD 
ABSOLUTE 
PRESSURE (MAP) 
SENSOR 
INSPECTION

)

• Inspect related 

harness

Idle (at sea level)

Approx. 

1.5

1K

Brake

Brake switch

Brake pedal depressed

B+

• Inspect brake switch

• Inspect related 

harness

Brake pedal released

Below 1.0

1L

—

—

—

—

—

1B

1A

1E

1D

1C

1H

1G

1J

1F

1I

1M

1L

1N 1K

1T 1Q

1P

1S

1O

1R

1W

1V

1Z

1Y

1X

1AC

1AB

1AA

1AD

1U

2B

2A

2E

2D

2C

2H

2G

2J

2F

2I

2M

2L

2N 2K

2T 2Q

2P

2S

2O

2R

2W

2V

2Z

2Y

2X

2AC

2AB

2AA

2AD

2U

3B

3A

3E

3D

3C

3H

3G

3J

3F

3I

3M

3L

3N 3K

3T 3Q

3P

3S

3O

3R

3W

3V

3Z

3Y

3X

3AA

3U

4B

4A

4E

4D

4C

4H

4G

4J

4F

4I

4M

4L

4N 4K

4T 4Q

4P

4S

4O

4R

4W

4V

4Z

4Y

4X

4AC

4AB

4AA

4AD

4U

A6A3940W002

CONTROL SYSTEM 

F–48–3

F

1M

ECT

ECT sensor

Ignition switch 
ON

ECT 20 

°C 

{68 

°F}

3.04—

3.14

• Inspect ECT sensor

(See 

F–53 ENGINE 

COOLANT 
TEMPERATURE 
(ECT) SENSOR 
INSPECTION

)

• Inspect related 

harness

ECT 60 

°C 

{140 

°F}

1.29—

1.39

1N

—

—

—

—

—

1O

—

—

—

—

—

1P

MAF

MAF sensor

Ignition switch ON

Approx. 

0.7

• Inspect MAF sensor

(See 

F–51 MASS AIR 

FLOW (MAF) 
SENSOR 
INSPECTION

)

• Inspect related 

harness

Idle (after warm up)

Approx. 

1.3

1Q

Refrigerant 
pressure switch 
(middle)

Refrigerant 
pressure switch 
(middle)

A/C ON

Refrigerant 
pressure is 
above 1.52 
MPa {15.5 kgf/
cm

2

, 220 psi}

Below 1.0

• Inspect refrigerant 

pressure switch

• Inspect related 

harness

Refrigerant 
pressure is 
below 1.23 
MPa {12.5 kgf/
cm

2

, 178 psi}

B+

1R*

1

Clutch operation

Clutch switch

Clutch pedal depressed

Below 1.0

• Inspect clutch switch

(See 

F–59 CLUTCH 

SWITCH 
INSPECTION

)

• Inspect related 

harness

Clutch pedal released

B+

1S

—

—

—

—

—

1T

—

—

—

—

—

1U

—

—

—

—

—

1V

—

—

—

—

—

1W

Neutral position*

1

Neutral switch

Shift lever is at neutral position

Below 1.0

• Inspect neutral switch

(See 

F–59 NEUTRAL 

SWITCH 
INSPECTION

)

• Inspect related 

harness

Shift lever is not at neutral 
position

B+

Selector lever 
position*

2

TR switch 
(terminal C)

Ignition switch 
ON

P range

Approx. 

4.6

• Inspect TR switch

• Inspect related 

harness

R range

Approx. 

3.9

N range

Approx. 

3.2

D range*

3

M range*

4

Approx. 

2.5

S range*

3

Approx. 

1.7

L range*

3

Approx. 

0.94

1X

—

—

—

—

—

1Y

HO2S (rear)

HO2S (rear)

Ignition switch ON

Approx. 0

• Inspect HO2S (rear)

(See 

F–56 HEATED 

OXYGEN SENSOR 
(HO2S) 
INSPECTION

)

• Inspect related 

harness

Idle (after warm up)

0—1.0

Terminal

Signal

Connected to

Test condition

Voltage 

(V)

Action