Pcm Inspection - Mazda Mazda6 Workshop Manual Supplement

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PCM INSPECTION

Using WDS or Equivalent
Caution
• The PCM terminal voltage 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, diagnosis will be incorrect.
Note
• For replace the PCM, setup the WDS and perform the following.
— "PCM configuration" (See
— "Correction after Parts Installation" (See
1. Connect the WDS or equivalent to the DLC-2. (See
2. Turn the engine switch to ON.
3. Measure the PID value.
• If PID value is not within the specification, follow the instructions in ACTION column.
PID Monitor Table
Monitor item (Definition)
ACCS
(A/C relay)
ACSW
(A/C switch)
APS1
(Accelerator position sensor
No.1 signal voltage)
APS2
(Accelerator position sensor
No.2 signal voltage)
BARO
(BARO)
BARO
(BARO signal voltage)
BOO
(Brake switch)
CPP
(Clutch switch)
CPP/PNP
(neutral switch)
CRUISESW
(Cruise control switch)
DTCCNT
(DTC count)
ECT
(ECT)
ECT
(ECT signal voltage)
FAN2
(Cooling fan relay No.2)
FAN3
(Cooling fan relay No.1)
CONTROL SYSTEM
F2–68 PCM CONFIGURATION.)
F2–34 Correction after Parts
Unit/ Condition/Specification
Condition (Reference)
• A/C operating: ON
ON/OFF
• Engine switch is on: OFF
• A/C switch is on: ON
ON/OFF
• A/C switch is off: OFF
• Accelerator pedal depressed:
3.35—4.03 V
V
• Accelerator pedal released: 0.4—
0.7 V
• Accelerator pedal depressed:
3.35—4.03 V
V
• Accelerator pedal released: 0.4—
0.7 V
• Elevation 0—400 m {0—1310 ft}:
kPa inHg
100—103 kPa {29.5—30.4 inHg} Replace PCM.
• Elevation 0—400 m {0—1310 ft}:
V
approx. 4.0 V
• Brake pedal depressed: ON
ON/OFF
• Brake pedal released: OFF
• Clutch pedal depressed: ON
ON/OFF
• Clutch pedal released: OFF
• Gear is neutral position: Neutral
Neutral/Drive
• Gear is not neutral position: Drive
• Cruise control switch is on: ON
ON/OFF
• Cruise control switch is off: OFF
• Number of output DTC
–
• ECT is 20°C {68°F}: 20°C
{68°F}
°C °F
• ECT is 85°C {185°F}: 85°C
{185°F}
• ECT is 20°C {68°F}: 3.0—3.2 V
V
• ECT is 85°C {185°F}: 0.7—0.9 V
• Engine coolant temperature is
ON/OFF above 100°C {212°F}: ON
• Others: OFF
• Engine coolant temperature is
above 108°C {226°F}: ON
ON/OFF
• A/C switch is on: ON
• Others: OFF
F2–85 ON-BOARD DIAGNOSTIC
Inspect A/C relay.
(See
INSPECTION)
Inspect A/C switch.
Inspect accelerator position
sensor.
(See
ACCELERATOR POSITION
SENSOR
Inspect accelerator position
sensor.
(See
ACCELERATOR POSITION
SENSOR
(See
REMOVAL/INSTALLATION)
Inspect brake switch.
Inspect clutch switch.
(See
SWITCH
Inspect neutral switch.
(See
SWITCH
Inspect cruise control switch.
Follow DTC inspection.
(See
Inspect ECT sensor.
(See
COOLANT TEMPERATURE
(ECT) SENSOR
INSPECTION)
Inspect cooling fan relay
No.2.
Inspect cooling fan relay
No.1.
A6E404018881208
Installation.)
TEST.)
PCM
Action
terminal
T–19 RELAY
F2–72
INSPECTION)
F2–72
INSPECTION)
F2–64 PCM
F2–68 CLUTCH
INSPECTION)
F2–69 NEUTRAL
INSPECTION)
F2–87 DTC TABLE)
F2–76 ENGINE
102
F2–65
F2
73
84
10
88
–
7
33
56
64
–
87
76