Mazda CX 7. Manual - part 79

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–13

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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X: Applied

MAF sensor or related circuit malfunction

Knock sensor or 

related circuit 

malfunction

TP sensor or related circuit malfunction

Accelerator position sensor or related circuit 

malfunction

Improper refrigerant charging amount

A/C relay (A/C control signal circuit) malfunction

A/C system improper operation

P/S pressure switch or related circuit malfunction

Improper vehicle speed signal

CMP sensor damaged (e

.g.open or shor

t circuit)

CMP sensor pulse wheel (camshaft) is damaged

lmproper gap betw

een CKP sensor and pulse wheel

Cr

uise control system oper

ation improper

ly

CKP sensor pulse wheel damaged

CKP sensor damaged (e

.g.open or shor

t circuit)

Acceleration/cruise

Acceleration/cruise

TR s

witch misadjustment

P/N position s

witch in 

TR s

witch open

acxuuw00000315

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–14

End Of Sie

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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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A/C compressor magnetic clutch malfunction

Improper balance of wheels and tires

Immobiliz

er system oper

ating proper

ly

Immobiliz

er system or related circuit malfunction

Adv

anced k

e

yless entr

y system malfunction

Dr

iv

e line malfunction

Suspension malfunction

Br

ak

e dr

agging

Loose par

ts

Acceleration/cruise

Acceleration/cruise

A

TX related par

ts malfunction

Improper A

TF le

v

e

l

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–15

01-03

NO.1 MELTING OF MAIN OR OTHER FUSES[L3 WITH TC]

id010339800700

1

MELTING OF MAIN OR OTHER FUSES

[TROUBLESHOOTING HINTS]
Inspect condition of fuse.

Damaged fuse

Related wiring harness

MAIN

MAIN fuse

• Starter

• Generator

IGN 1

IGN 1 fuse

• Room fuse

• Ignition switch

— Starter relay

— Starter relay No.2

— PCM

IGN 2

IGN 2 fuse

• Ignition switch

• Starter relay

— Engine fuse

— Meter fuse

— Starter

ENGINE (15A)

ENGINE fuse (15A)

• Fuel pump speed control relay

• Fuel pump relay

• Injector relay

• Ignition coil

— PCM

ENGINE (30A)

ENGINE fuse (30A)

• Main relay

FAN 1

FAN 1 fuse

• Cooling fan relay No.1

— Fan control module main

FAN 2

FAN 2 fuse

• Cooling fan relay No.2

— PCM

— Fan control module sub

FUEL

FUEL fuse

• Fuel pump resistor

• Fuel pump speed control relay

— Fuel pump relay

— Fuel pump unit

METER

METER fuse

• Starter relay No.2

— TCM

ROOM

ROOM fuse

• DLC-2

INJ

INJ fuse

• Injector relay

— PCM

Shorted wiring harness

Repair shorted wiring harness and replace fuse

Fuse

Deterioration

Replace fuse

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SYMPTOM TROUBLESHOOTING [L3 WITH TC]

01-03–16

End Of Sie

NO.2 MIL ILLUMINATES[L3 WITH TC]

id010339800800

Diagnostic procedure

End Of Sie

ETC

ETC fuse

• PCM

• Drive-by-wire relay

ECM

ECM fuse

• PCM

• Drive-by-wire relay

• Cooling fan relay No.1

• Cooling fan relay No.2

ENG BAR 1

ENG BAR 1 fuse

• Evapo system leak detection pump

• Mass air flow sensor

• Purge solenoid

• Waste gate control valve

• Variable swirl solenoid valve

• Camshaft position sensor

• Crankshaft position sensor

• PCM

• Oil control valve

• EGR valve

ENG BAR 2

ENG BAR 2 fuse

• HO2S (front)

ENG BAR 3

ENG BAR 3 fuse

• HO2S (rear)

— PCM

Damaged fuse

Related wiring harness

2

MIL ILLUMINATES

DESCRIPTION

MIL illuminates incorrectly.

POSSIBLE CAUSE

• PCM illuminates for emission-related concern (DTC is stored in PCM)

• Instrument cluster malfunction

Note

• If the MIL blinks at a steady rate, a misfire condition could possibly exist.

STEP

INSPECTION

RESULTS

ACTION

1

Connect the M-MDS to the DLC.
Turn the ignition switch to the ON position.
Retrieve any DTCs.
Is a DTC displayed?

Yes

DTC is displayed:

• Go to the appropriate DTC test.

(See01-02-13 DTC TABLE[L3 WITH TC].)

No

No DTC is displayed:

• Inspect for an open or short to circuit between 

instrument cluster terminal 2T and PCM terminal 
1AI

• Inspect for an open or short to circuit between 

instrument cluster terminal 2R and PCM terminal 
1AM
(See09-22-3 INSTRUMENT CLUSTER 
INSPECTION.)

2

Verify test results.

• If normal, return to the diagnostic index to service any additional symptoms.

• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the 

repair or diagnosis.

— If the vehicle is repaired, troubleshooting is completed.

— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later 

calibration is available. Retest.

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