Mazda CX 7. Manual — part 12

ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–3

01-02

ON-BOARD DIAGNOSTIC WIRING DIAGRAM[L3 WITH TC]

id010239800100

a

a

f

b

b

b

b

c

c

d

e

1BE

1P

1BA

1AY

1AK

1AR

1AV

1AZ

1M

1Y

1Q

2BG

2BB

2BH

2BD

2BC

2BF

2BE

2AZ

1BF

1AX

1AE

1AO

2Q

2C

2D

2N

2I

2R

2P

2M

2Z

2Y

2X

2W

2S

1B

1R

1K

1I

1H

1AW

1AJ

1AC

2AY

2AH

2AV

2AG

2AD

2AC

2AU

1U

1AT

1AA

1BC

PCM

MAF
SENSOR

APP
SENSOR

IAT SENSOR

FUEL PRESSURE SENSOR

ECT SENSOR

MAP
SENSOR

BOOST AIR TEMPERATURE
SENSOR

HO2S (REAR)

HO2S
(FRONT)

CKP SENSOR

CMP SENSOR

FUEL INJECTOR
NO.1

FUEL INJECTOR
NO.4

FUEL INJECTOR
NO.3

FUEL INJECTOR
NO.2

FUEL INJECTOR RELAY

HO2S HEATER (FRONT)

HO2S HEATER (REAR)

FAN CONTROL MODULE NO.1

COOLING FAN
RELAY NO.1

FAN CONTROL MODULE NO.2

COOLING FAN
RELAY NO.2

A/C RELAY

FUEL PUMP SPEED CONTROL RELAY

FUEL PUMP RESISTOR

FUEL PUMP RELAY

MAIN RELAY

STARTER RELAY

DRIVE-BY-WIRE-RELAY

BATTERY

IGNITION
SWITCH

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–4

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f

d

e

b

2V

2U

1V

2T

1J

1AS

2AB

2AA

2AS

2AF

2E

2B

2A

2H

2F

2G

1AB

1AF

1AU

2AE

2AK

2AP

2AL

2AO

2AQ

2AM

2AR

2AN

1BB

1BG

1BD

1BH

2BA

2AW

2AX

2AT

2AI

2AJ

1AQ

1AM

1AI

KS

TP SENSOR

BRAKE SWITCH NO.1

BRAKE SWITCH NO.2

VARIABLE SWIRL SHUTTER VALVE SWITCH

REFRIGERANT PRESSURE SWITCH (HIGH, LOW)

REFRIGERANT PRESSURE SWITCH (MIDDLE)

PSP SWITCH

CRUISE CONTROL SWITCH

GENERATOR

CAN

EGR VALVE

EVAP SYSTEM LEAK
DETECTION PUMP

PURGE SOLENOID VALVE

WASTEGATE CONTROL
SOLENOID VALVE

VARIABLE SWIRL
SOLENOID VALVE

OCV

THROTTLE
ACTUATOR

SPILL VALVE CONTROL
SOLENOID VALVE

IGNITION COIL NO.1

IGNITION COIL NO.2

IGNITION COIL NO.3

IGNITION COIL NO.4

GENERATOR

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–5

01-02

MONITORING SYSTEM AND CONTROL SYSTEM DEVICE RELATIONSHIP CHART[L3 WITH TC]

id010239800200

×: Applicable

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Component

Input

Battery

x

x

x

Ignition switch

x

x

x

A/C switch, refrigerant pressure switch (high, low pressure)

x

x

TP sensor

x

x

x

x

x

x

ECT sensor

x

x

x

x

x

x

x

x

IAT sensor

x

x

x

x

x

x

MAF sensor

x

x

x

x

x

x

x

HO2S (front)

x

x

x

x

HO2S (rear)

x

x

x

x

Fuel gauge sender unit

x

BARO sensor

x

x

MAP sensor

x

CMP sensor

x

CKP sensor

x

x

x

x

x

x

x

x

VSS

x

x

x

x

Output

Fuel injector

x

HO2S heater (front)

x

HO2S heater (rear)

x

EGR valve

x

Purge solenoid valve

x

x

x

x

EVAP system leak detection pump

x

MIL

x

x

x

x

x

x

x

x

DLC-2

x

x

x

x

x

x

x

x

Oxygen sensor monitor

Oxygen sensor heater monitor

Catalyst monitor

Misfire monitor

Fuel system monitor

Ev

apor

ativ

e system monitor

EGR system monitor

Engine cooling system

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ON-BOARD DIAGNOSTIC [L3 WITH TC]

01-02–6

FOREWORD[L3 WITH TC]

id010239800300

• When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL) indication and

diagnostic trouble code (DTC), then diagnose the malfunction according to the following flowchart.

— If a DTC exists, diagnose the applicable DTC inspection. (See 01-02-13 DTC TABLE[L3 WITH TC].)

— If a DTC does not exist and the MIL does not illuminate or flash, diagnose the applicable symptom

troubleshooting. (See 01-03-8 QUICK DIAGNOSTIC CHART[L3 WITH TC].)

*: Malfunction Indicator Lamp (MIL), Generator Warning Light, Security Light

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OBD-II PENDING TROUBLE CODE[L3 WITH TC]

id010239800400

• These appear when a problem is detected in a monitored system. The code for a failed system is stored in the

PCM memory in the first drive cycle. This code is called the pending code. If the PCM determines that the
system has returned to normal or the problem was mistakenly detected, it deletes the pending code. If the
problem is found in the second drive cycle, too the PCM determines that the system is malfunctioning, and the
DTC is stored.

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OBD-II FREEZE FRAME DATA[L3 WITH TC]

id010239800500

• This is technical data which indicates the engine condition at the time of the first malfunction. This data will

remain in the memory even if another emission-related DTC is stored, with the exception of the Misfire or Fuel
System DTCs. Once freeze frame data for the Misfire or Fuel System DTC is stored, it will overwrite any
previous data and the freeze frame will not be overwritten again.

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OBD-II ON-BOARD SYSTEM READINESS TEST[L3 WITH TC]

id010239800600

• This shows the OBD-II systems operating status. If any monitor function is incomplete, the M-MDS will identify

which monitor function has not been completed. Misfires, Fuel System and Comprehensive Components
(CCM) are continuous monitoring-type functions. The catalyst, EGR system, evaporation system and oxygen
sensor will be monitored under drive cycles. The OBD-II diagnostic system is initialized by performing the DTC
cancellation procedure or disconnecting the negative battery cable.

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OBD-II READ/CLEAR DIAGNOSTIC TEST RESULTS[L3 WITH TC]

id010239800800

• This retrieves all stored DTCs in the PCM and clears the DTC, Freeze Frame Data, On-Board Readiness Test

Results, Diagnostic Monitoring Test Results and Pending Trouble Codes.

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OBD-II PARAMETER IDENTIFICATION (PID) ACCESS[L3 WITH TC]

id010239800900

• The PID mode allows access to certain data values, analog and digital inputs and outputs, calculated values

and system status information. Since PID values for output devices are PCM internal data values, inspect each
device to identify which output devices are malfunctioning.

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CUSTOMER ARRIVES

WARNING LIGHT*
ON/FLASHING

CHECK FOR
PRIORITIZED DTC

NO WARNING LIGHT*
WITH SYMPTOM

•CHECK DTC
•IGNITION ON TEST, IDLING TEST

DIAGNOSE BY DTC
(ON-BOARD DIAGNOSTIC)
•DTC TABLE
•DTC
TROUBLESHOOTING
FLOW

DIAGNOSE BY SYMPTOM
(SYMPTOM TROUBLESHOOTING)
1. DIAGNOSTIC INDEX
2. QUICK DIAGNOSIS CHART
3. SYMPTOM TROUBLESHOOTING

DTC

WITHOUT DTC

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