Mazda CX 7. Manual — part 76

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–1

01-03

01-03

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

SYMPTOM TROUBLESHOOTING WIRING

DIAGRAM[L3 WITH TC] . . . . . . . . . . . . 01-03–2

FOREWORD[L3 WITH TC] . . . . . . . . . . . 01-03–4
ENGINE SYMPTOM

TROUBLESHOOTING
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–5

CONTROL SYSTEM DEVICE AND

CONTROL RELATIONSHIP CHART
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–6

QUICK DIAGNOSTIC CHART

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–8

NO.1 MELTING OF MAIN OR OTHER

FUSES[L3 WITH TC] . . . . . . . . . . . . . . 01-03–15

NO.2 MIL ILLUMINATES

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–16

NO.3 WILL NOT CRANK

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–17

NO.4 HARD TO START/LONG

CRANK/ERRATIC START/ERRATIC
CRANK[L3 WITH TC]. . . . . . . . . . . . . . 01-03–20

NO.5 ENGINE STALLS-AFTER

START/AT IDLE[L3 WITH TC] . . . . . . . 01-03–23

NO.6 CRANKS NORMALLY BUT WILL

NOT START[L3 WITH TC] . . . . . . . . . . 01-03–28

NO.7 SLOW RETURN TO IDLE

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–32

NO.8 ENGINE RUNS ROUGH/ROLLING

IDLE[L3 WITH TC] . . . . . . . . . . . . . . . . 01-03–34

NO.9 FAST IDLE/RUNS ON

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–37

NO.10 LOW IDLE/STALLS DURING

DECELERATION[L3 WITH TC] . . . . . . 01-03–39

NO.11 ENGINE STALLS/QUITS,

ENGINE RUNS ROUGH, MISSES,
BUCK/JERK, HESITATION/STUMBLE,
SURGES[L3 WITH TC] . . . . . . . . . . . . . 01-03–41

NO.12 LACK/LOSS OF POWER

(ACCELERATION/CRUISE)
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–46

NO.13 KNOCKING/PINGING

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–50

NO.14 POOR FUEL ECONOMY

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–53

NO.15 EMISSION COMPLIANCE

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–56

NO.16 HIGH OIL

CONSUMPTION/LEAKAGE
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–59

NO.17 COOLING SYSTEM

CONCERNS-OVERHEATING
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–60

NO.18 COOLING SYSTEM

CONCERNS-RUNS COLD
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–61

NO.19 EXCESSIVE BLACK SMOKE

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . 01-03–62

NO.20 FUEL ODOR (IN ENGINE

COMPARTMENT)[L3 WITH TC] . . . . . . 01-03–65

NO.21 ENGINE NOISE

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–66

NO.22 VIBRATION CONCERNS (ENGINE)

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–67

NO.23 A/C DOES NOT WORK

SUFFICIENTLY[L3 WITH TC] . . . . . . . . 01-03–68

NO.24 A/C IS ALWAYS ON OR A/C

COMPRESSOR RUNS CONTINUOUSLY
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–69

NO.25 A/C IS NOT CUT OFF UNDER

WIDE OPEN THROTTLE CONDITIONS
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–70

NO.26 EXHAUST SULPHUR SMELL

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–70

NO.27 FUEL REFILL CONCERNS

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–71

NO.28 FUEL FILLING SHUT

OFF ISSUES[L3 WITH TC] . . . . . . . . . . 01-03–72

NO.29 SPARK PLUG CONDITION

[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–73

INTERMITTENT CONCERN

TROUBLESHOOTING
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–76

Vibration Method . . . . . . . . . . . . . . . . . . 01-03–76
Water Sprinkling Method . . . . . . . . . . . . 01-03–77

ENGINE CONTROL SYSTEM

OPERATION INSPECTION
[L3 WITH TC] . . . . . . . . . . . . . . . . . . . . . 01-03–78

Input Signal System

Investigation Procedure . . . . . . . . . . . 01-03–78

Main Relay Operation Inspection . . . . . 01-03–81
Intake Manifold

Vacuum Inspection. . . . . . . . . . . . . . . 01-03–82

Electronic Throttle Control

System Inspection . . . . . . . . . . . . . . . 01-03–82

Variable Swirl System

Operation Inspection . . . . . . . . . . . . . 01-03–83

Fuel Injector

Operation Inspection . . . . . . . . . . . . . . 01-03–84

Fuel Cut Control

System Inspection. . . . . . . . . . . . . . . . 01-03–85

Fuel Pump Operation Inspection. . . . . . 01-03–85
Fuel Pump Control

System Inspection. . . . . . . . . . . . . . . . 01-03–86

Fuel Pump Speed

Control Inspection . . . . . . . . . . . . . . . 01-03–86

Spark Test . . . . . . . . . . . . . . . . . . . . . . . 01-03–87
EGR Control

System Inspection. . . . . . . . . . . . . . . . 01-03–87

Purge Control System Inspection . . . . . 01-03–88
A/C Cut-off Control

System Inspection . . . . . . . . . . . . . . . 01-03–89

Cooling Fan Control

System Inspection. . . . . . . . . . . . . . . . 01-03–89

Wastegate Control System

Operation Inspection . . . . . . . . . . . . . . 01-03–90

Variable Valve Timing Control

System Operation Inspection . . . . . . . 01-03–90

Evaporative Emission (EVAP)

System Leak Inspection . . . . . . . . . . . 01-03–91

End of Toc

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–2

WM: SYMPTOM TROUBLESHOOTING (ENGINE CONTROL SYSTEM)

SYMPTOM TROUBLESHOOTING WIRING DIAGRAM[L3 WITH TC]

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a

a

f

b

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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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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–3

01-03

End Of Sie

f

d

e

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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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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–4

FOREWORD[L3 WITH TC]

id010339800300

• 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 no DTC exists 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

End Of Sie

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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