Mazda CX 7. Manual - part 77

 

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Mazda CX 7. Manual - part 77

 

 

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–5

01-03

ENGINE SYMPTOM TROUBLESHOOTING[L3 WITH TC]

id010339800500

• Verify malfunction symptoms using the following diagnostic index, then go to the appropriate troubleshooting 

chart.

 Diagnostic Index

End Of Sie

No.

TROUBLESHOOTING ITEM

DESCRIPTION

1

Melting of main or other fuses

— 

2

MIL illuminates

MIL is illuminated.

3

Will not crank

Starter does not work.

4

Hard to start/long crank/erratic start/erratic 
crank

Starter cranks engine at normal speed but engine requires excessive 
cranking time before starting.

5

Engine stalls.

After start/at idle

Engine stops unexpectedly at idle or after start or both.

6

Cranks normally but will not start

Starter cranks engine at normal speed but engine will not run.

7

Slow return to idle

Engine takes more time than normal to return to idle speed.

8

Engine runs rough/rolling idle

Engine speed fluctuates between specified idle speed and lower 
speed and engine shakes excessively.

9

Fast idle/runs on

Engine speed continues at fast idle after warm-up.
Engine runs after ignition switch is turned off.

10

Low idle/stalls during deceleration

Engine stops unexpectedly at beginning of deceleration or recovery 
from deceleration.

11

Engine stalls/quits.

Acceleration/cruise

Engine stops unexpectedly at beginning of acceleration or during 
acceleration.
Engine stops unexpectedly while cruising.

Engine runs rough.

Acceleration/cruise

Engine speed fluctuates during acceleration or cruising.

Misses

Acceleration/cruise

Engine misses during acceleration or cruising.

Buck/jerk

Acceleration/cruise/ 
deceleration

Vehicle bucks/jerks during acceleration, cruising, or deceleration.

Hesitation/stumble

Acceleration

Momentary pause at beginning of acceleration or during acceleration

Surges

Acceleration/cruise

Momentary minor irregularity in engine output

12

Lack/loss of power

Acceleration/cruise

Performance is poor under load.
 (e.g., power down when climbing hills)

13

Knocking/pinging

Acceleration/cruise

Sound is produced when air/fuel mixture is ignited by something other 
than spark plug. (e.g., hot spot in combustion chamber)

14

Poor fuel economy

Fuel economy is unsatisfactory.

15

Emission compliance

Fails emissions test.

16

High oil consumption/leakage

Oil consumption is excessive.

17

Cooling system 
concerns

Overheating

Engine runs at higher than normal temperature/overheats.

18

Cooling system 
concerns

Runs cold

Engine does not reach normal operating temperature.

19

Exhaust smoke

Blue, black, or white smoke from exhaust system

20

Fuel odor (in engine compartment)

Gasoline fuel smell or visible leakage

21

Engine noise

Engine noise from under hood

22

Vibration concerns (engine)

Vibration from under hood or driveline

23

A/C does not work sufficiently.

A/C compressor magnetic clutch does not engage when A/C is turned 
on.

24

A/C is always on or A/C compressor runs 
continuously.

A/C compressor magnetic clutch does not disengage.

25

A/C is not cut off under WOT conditions.

A/C compressor magnetic clutch does not disengage under WOT.

26

Exhaust sulphur smell

Rotten egg smell (sulphur) from exhaust

27

Fuel refill concerns

Fuel tank does not fill smoothly.

28

Fuel filling shut off issues

Fuel does not shut off properly.

29

Spark plug condition

Incorrect spark plug condition

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–6

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

id010339800200

X: Applied

Item

Input device

IAT  sensor

X

X

X

X

X

X

X

X

X

MAF  sensor

X

X

X

X

X

X

X

X

X

X

X

X

X

TP sensor No.1, No.2

X

X

X

X

X

X

X

X

APP sensor No.1, 
No.2

X

X

X

X

X

X

X

X

X

X

MAP sensor

X

X

X

X

X

ECT  sensor

X

X

X

X

X

X

X

X

X

X

X

X

X

CMP  sensor

X

X

X

X

X

CKP  sensor

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

X

KS

X

HO2S (front, rear)

X

X

X

BARO sensor

X

X

X

X

X

X

X

Neutral switch

X

X

X

X

X

X

X

X

X

CPP switch

X

X

X

X

X

X

X

X

X

Brake switch

X

X

X

X

Instrument cluster (A/
C on request signal)

X

X

X

Refrigerant pressure 
switch 
(low pressure switch, 
high pressure switch)

X

X

X

Refrigerant pressure 
switch (medium 
pressure switch)

X

X

Battery

X

X

X

X

X

X

X

X

X

X

X

Generator (Terminal 
P: starter coil)

X

X

Vehicle speed signal

X

X

X

X

X

X

X

X

X

Cruise control switch

X

Instrument cluster 
(CAN signal)

X

X

X

X

X

X

X

Ignition switch 

X

X

X

X

X

X

X

Fuel pressure sensor

X

X

X

X

Boost air temperature 
sensor

X

X

X

X

X

Output device

Throttle actuator

X

X

X

Drive-by-wire-relay

X

ELECTR

ONIC THR

O

TTLE 

CONTR

OL

IA

C

V

ARIABLE SWIRL CONTR

OL

V

ARIABLE V

A

L

VE 

TIMING 

CONTR

OL

FUEL INJECTION CONTR

OL

FUEL PUMP CONTR

OL

ESA CONTR

OL

EGR CONTR

OL

EV

APORA

TIVE PURGE CONTR

OL

HO2S HEA

TER CONTR

OL

A/C CUT

-OFF CONTR

OL

ELECTRICAL F

AN CONTR

OL

ST

AR

TER CUT

-OFF CONTR

OL

GENERA

T

OR CONTR

OL

CR

UISE CONTR

OL

CAN

HIGH PRESSURE FUEL PUMP CONTR

OL 

W

ASTEGA

TE CONTR

OL

FUEL PUMP SPEED CONTR

OL

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–7

01-03

End Of Sie

Variable swirl shutter 
valve actuator

X

OCV

X

Injector driver module

X

Fuel pump relay

X

Ignition coil

X

EGR valve

X

Purge solenoid valve

X

HO2S heater (front, 
rear)

X

A/C relay

X

Fan control module

X

Starter relay

X

X

Generator (Terminal 
D: field coil)

X

ABS HU/CM (With 
ABS) (CAN signal)

X

Instrument cluster 
(CAN signal)

X

Spill valve control 
solenoid valve

X

Wastegate control 
solenoid valve

X

Fuel pump speed 
control relay

X

Item

ELECTR

ONIC THR

O

TTLE 

CONTR

OL

IA

C

V

ARIABLE SWIRL CONTR

OL

V

ARIABLE V

A

L

VE 

TIMING 

CONTR

OL

FUEL INJECTION CONTR

OL

FUEL PUMP CONTR

OL

ESA CONTR

OL

EGR CONTR

OL

EV

APORA

TIVE PURGE CONTR

OL

HO2S HEA

TER CONTR

OL

A/C CUT

-OFF CONTR

OL

ELECTRICAL F

AN CONTR

OL

ST

AR

TER CUT

-OFF CONTR

OL

GENERA

T

OR CONTR

OL

CR

UISE CONTR

OL

CAN

HIGH PRESSURE FUEL PUMP CONTR

OL 

W

ASTEGA

TE CONTR

OL

FUEL PUMP SPEED CONTR

OL

1871-1U-06B(01-03).fm  7 ページ  2006年3月15日 水曜日 午前10時36分

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–8

QUICK DIAGNOSTIC CHART[L3 WITH TC]

id010339800600

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x

x
x

x

x

x
x
x

x
x

x

x

x

x

x

x

x

x

Possible factor

Troubleshooting item

Melting of main or other fuses

MIL illuminates

Will not crank

Hard  start/long crank/erratic start/erratic crank

Engine stalls

After start/at idle

Cranks normally but will not start

Slow return to idle

Engine runs rough/rolling idle

Fast/idle runs on

Low idle/stalls during deceleration

Engine stalls/quits

Engine runs rough

Misses

Buck/jerk

Hesitation/stumble

Surges

Acceleration/cruise

Acceleration/cruise/
deceleration

Acceleration/cruise

Acceleration/cruise

Acceleration/cruise

Acceleration/cruise

Poor fuel economy

Emission compliance

High oil consumption/leakage

Cooling system concerns

Cooling system concerns

Overheating

Runs cold

Exhaust smoke

Fuel odor (in engine compartment)

Engine noise

Vibration concerns (engine)

A/C does not work sufficiency

A/C  always on or A/C compressor 
runs continuously.

  A/C does not cut off under wide open throttle 

Exhaust sulphur smell

Fuel refill concerns

Fuel filling shut off issues

Spark plug condition

Knocking/pinging

Lack/loss of power

1
2

3

4

5

6

7

8

9

10

11

12

13

14

15

16

20

21

22

23

25

26

27

28

29

17

18

19

24

X: Applied

Starter motor malfunction (Mechanical or electrical)

Starter circuit including ignition switch is open

Improper engine oil level

Low or dead battery

Charging system malfunction

Improper engine compression

Improper dipstick

Base engine malfunction

Flywheel is seized

Improper tension or damaged drive belts

Improper engine coolant level

Water and anti-freeze mixture is improper

Cooling system malfunction (Radiator, 

hoses,overflow system, thermostat, etc.)

Cooling fan system malfunction

Acceleration/cruise

Acceleration/cruise

acxuuw00000310

1871-1U-06B(01-03).fm  8 ページ  2006年3月15日 水曜日 午前10時36分

 

 

 

 

 

 

 

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