Mazda CX 7. Manual — part 78
SYMPTOM TROUBLESHOOTING [L3 WITH TC]
01-03–9
01-03
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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
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24
X: Applied
Engine or tr
ansaxle mounts are improper
ly installed.
Improper engine oil viscosity
Improper v
alv
e timing
Fuel quality
Cooling f
an or condenser f
an seats are improper
.
Coolant leakage (inter
nal, turbocharger
, e
xter
nal)
V
a
riab
le tumb
le control system malfunction
Air cleaner element clogging or restr
iction
Air suction in intak
e-air system
Intak
e-air system restr
iction
Air leakage from intak
e-air system (loose
tubes
, cr
ac
ks
, gask
ets b
loc
kage)
V
a
riab
le v
alv
e timing system malfunction
Oil leakage (inter
nal, turbocharger
, e
xter
nal)
Improper oil or fluid le
v
e
l
Engine o
v
erheating
Acceleration/cruise
Acceleration/cruise
acxuuw00000311
1871-1U-06B(01-03).fm 9 ページ 2006年3月15日 水曜日 午前10時36分
SYMPTOM TROUBLESHOOTING [L3 WITH TC]
01-03–10
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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
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24
X: Applied
Electronic throttle control improper oper
ation
Fuel pump (lo
w-pressure side) malfunction (Mechanically
or electr
ically)
Improper oper
ation of w
astegate system
Pressure regulator (b
uilt-in fuel pump unit at fuel tank)
Inadequate fuel pressure (High-pressure side)
Inadequate fuel pressure (Lo
w-pressure side)
Fuel line restr
iction or clogging
Ignition coil malfunction (e
.g.
open, shor
t or cr
ac
ks)
Initial ignition timing misadjustment (CKP and pulse wheel
misadjustment)
Charge air cooler malfunction
Spar
k plug malfunction
T
urbocharger malfunction
V
acuum leakage (V
acuum hose damage
, misrouting)
Throttle body malfunction
Acceleration/cruise
Acceleration/cruise
acxuuw00000312
1871-1U-06B(01-03).fm 10 ページ 2006年3月15日 水曜日 午前10時36分
SYMPTOM TROUBLESHOOTING [L3 WITH TC]
01-03–11
01-03
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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
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25
26
27
28
29
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18
19
24
X: Applied
Fuel filters restriction or clogging
Fuel injector malfunction (inoperative)
Fuel pump resister or related circuit malfunction
Improper air/fuel ratio mixture control
Exhaust
system or catalytic converter restriction
EGR system malfunction
EVAP control system malfunction
PCV valve malfunction
Fuel leakage at fuel line
High pressure fuel pump malfunction
Fuel pressure limiter malfunction (b
uilt-in common r
ail)
Spill v
alv
e control solenoid v
alv
e malfunction (b
uilt-in high
pressure fuel pump)
Incorrect fuel injection timing or amount
Catalytic con
v
e
rter malfunction
Exhaust gas leakage
Acceleration/cruise
Acceleration/cruise
acxuuw00000313
1871-1U-06B(01-03).fm 11 ページ 2006年3月15日 水曜日 午前10時36分
SYMPTOM TROUBLESHOOTING [L3 WITH TC]
01-03–12
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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
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24
X: Applied
Nonretur
n v
alv
e malfunction
Fuel shut off v
alv
e malfunction
No batter
y po
w
er supply to PCM
P
oor PCM g
round or v
ehicle g
round (open)
Electr
ical connector disconnection
ECT sensor or related circuit malfunction
Br
ak
e s
witch or related circuit malfunction
F
ront or rear HO2S sensor or related circuit malfunction
Fuel pressure sensor or related circuit malfunction
MAP sensor or related circuit malfunction
IA
T sensor 1 (integ
rated in MAF sensor) or related circuit
malfunction
Boost air temper
ature sensor (integ
rated in MAP sensor)
or related circuit malfunction
Constant v
oltage supply circuit malfunction
Main rela
y malfunction (mechanically or electr
ically)
Acceleration/cruise
Acceleration/cruise
acxuuw00000314
1871-1U-06B(01-03).fm 12 ページ 2006年3月15日 水曜日 午前10時36分
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