Mazda Protege 5. Manual — part 88

SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]

01–03A–5

01–03A

Inspection Method for Switch Connectors or Wires

1. Connect WDS or equivalent to DLC-2.
2. Turn ignition key to ON (Engine OFF).

Note

•

If engine starts and runs, perform the following steps at idle.

3. Access PIDs for the switch you are inspecting.
4. Turn switch on manually.
5. Shake each connector or wire harness a bit vertically and horizontally while monitoring the PID.

•

If PID value is unstable, check for poor connection.

Inspection Method for Sensor Connectors or Wires

1. Connect WDS or equivalent to DLC-2.
2. Turn ignition key to ON (Engine OFF).

Note

•

If engine starts and runs, perform the following steps at idle.

3. Access PIDs for the switch you are inspecting.
4. Shake each connector or wire harness a bit vertically and horizontally while monitoring the PID.

•

If PID value is unstable, check for poor connection.

Inspection Method for Sensors

1. Connect WDS or equivalent to DLC-2.
2. Turn ignition key to ON (Engine OFF).

Note

•

If engine starts and runs, perform the following steps at idle.

3. Access PIDs for the switch you are inspecting.
4. Vibrate the sensor slightly with your finger.

•

If PID value is unstable or malfunction occurs, check for poor connection and/or poorly mounted sensor.

YMU103WC0

YMU103WC1

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]

01–03A–6

Inspection Method for Actuators or Relays

1. Connect WDS or equivalent to DLC-2.
2. Turn ignition key to ON (Engine OFF).

Note

•

If engine starts and runs, perform the following steps at idle.

3. Prepare the SIMULATION TEST for actuators or relays that you are inspecting.
4. Vibrate the actuator or relay with your finger for 3 seconds after SIMULATION TEST is activated.

•

If variable click sound is heard, check for poor connection and/or poorly mounted actuator or relay.

Note

•

Vibrating relays too strongly may result in
open relays.

Water Sprinkling Method
If malfunction occurs only during high humidity or rainy/snowy weather, perform the following steps.

Caution

••••

Indirectly change the temperature and humidity by spraying water onto the front of the radiator.

••••

If a vehicle is subject to water leakage, the leakage may damage the control module. When testing
a vehicle with a water leakage problem, special caution must be used.

1. Connect WDS or equivalent to DLC-2 if you are inspecting sensors or switches.
2. Turn ignition key to ON (Engine OFF).

Note

•

If engine starts and runs, perform the following steps at idle.

3. Access PIDs for sensor or switch if you are inspecting sensors or switches.

•

If you are inspecting the switch, turn it on manually.

4. Spray water onto the vehicle or run it through a car wash.

•

If PID value is unstable or malfunction occurs, repair or replace part as necessary.

End Of Sie

YMU103WC2

Y5U103WA6

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]

01–03A–7

01–03A

SYMPTOM DIAGNOSTIC INDEX [ZM]

A3U010318881W41

•

Confirm trouble symptom using the following diagnostic index, then go to appropriate troubleshooting chart.

Diagnostic Index

No.

TROUBLESHOOTING ITEM

DESCRIPTION

PAGE

1

Melting of main or other fuses

—

(See 01–03A–13 NO.1
MELTING OF MAIN OR
OTHER FUSES [ZM].)

2

MIL illuminates

MIL is illuminated incorrectly.

(See 01–03A–14 NO.2 MIL
ILLUMINATES [ZM].)

3

Will not crank

Starter does not work.

(See 01–03A–14 NO.3 WILL
NOT CRANK [ZM].)

4

Hard start/long crank/erratic start/
erratic crank

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

(See 01–03A–15 NO.4 HARD
TO START/LONG CRANK/
ERRATIC START/ERRATIC
CRANK [ZM].)

5

Engine stalls.

After start/at idle

Engine stops unexpectedly at idle and/or
after start.

(See 01–03A–18 NO.5
ENGINE STALLS-AFTER
START/AT IDLE [ZM].)

6

Cranks normally but will not start

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

(See 01–03A–21 NO.6
CRANKS NORMALLY BUT
WILL NOT START [ZM].)

7

Slow return to idle

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

(See 01–03A–24 NO.7 SLOW
RETURN TO IDLE [ZM].)

8

Engine runs rough/rolling idle

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

(See 01–03A–25 NO.8
ENGINE RUNS ROUGH/
ROLLING IDLE [ZM].)

9

Fast idle/runs on

Engine speed continues at fast idle after
warm-up. Engine runs after ignition key is
turned to OFF.

(See 01–03A–27 NO.9 FAST
IDLE/RUNS ON [ZM].)

10

Low idle/stalls during deceleration

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

(See 01–03A–28 NO.10 LOW
IDLE/STALLS DURING
DECELERATION [ZM].)

11

Engine stalls/
quits.

Acceleration/
cruise

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

(See 01–03A–29 NO.11
ENGINE STALLS/QUITS,
ENGINE RUNS ROUGH,
MISSES, BUCK/JERK,
HESITATION/STUMBLE,
SURGES [ZM].)

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).

(See 01–03A–32 NO.12 LACK/
LOSS OF
POWER-ACCELERATION/
CRUISE [ZM].)

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).

(See 01–03A–34 NO.13
KNOCKING/
PINGING-ACCELERATION/
CRUISE [ZM].)

14

Poor fuel economy

Fuel economy is unsatisfactory.

(See 01–03A–35 NO.14 POOR
FUEL ECONOMY [ZM].)

15

Emission compliance

Fails emissions test

(See 01–03A–37 NO.15
EMISSION COMPLIANCE
[ZM].)

16

High oil consumption/leakage

Oil consumption is excessive.

(See 01–03A–38 NO.16 HIGH
OIL CONSUMPTION/
LEAKAGE [ZM].)

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]

01–03A–8

End Of Sie

17

Cooling system
concerns

Overheating

Engine runs at higher than normal
temperature/overheats.

(See 01–03A–39 NO.17
COOLING SYSTEM
CONCERNS-OVERHEATING
[ZM].)

18

Cooling system
concerns

Runs cold

Engine does not reach normal operating
temperature.

(See 01–03A–40 NO.18
COOLING SYSTEM
CONCERNS-RUNS COLD
[ZM].)

19

Exhaust smoke

Blue, black, or white smoke from exhaust
system

(See 01–03A–41 NO.19
EXHAUST SMOKE [ZM].)

20

Fuel odor (in engine compartment)

Gasoline fuel smell or visible leakage

(See 01–03A–43 NO.20 FUEL
ODOR (IN ENGINE
COMPARTMENT) [ZM].)

21

Engine noise

Engine noise from under hood

(See 01–03A–44 NO.21
ENGINE NOISE [ZM].)

22

Vibration concerns (engine)

Vibration from under hood or driveline

(See 01–03A–45 NO.22
VIBRATION CONCERNS
(ENGINE) [ZM].)

23

A/C does not work sufficiently.

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

(See 01–03A–45 NO.23 A/C
DOES NOT WORK
SUFFICIENTLY [ZM].)

24

A/C is always ON/A/C compressor
runs continuously.

A/C compressor magnetic clutch does not
disengage.

(See 01–03A–46 NO.24 A/C IS
ALWAYS ON/A/C
COMPRESSOR RUNS
CONTINUOUSLY [ZM].)

25

A/C does not cut off under wide open
throttle conditions.

A/C compressor magnetic clutch does not
disengage under wide open throttle.

(See 01–03A–47 NO.25 A/C
DOES NOT CUT OFF UNDER
WIDE OPEN THROTTLE
CONDITIONS [ZM].)

26

Exhaust sulphur smell

Rotten egg smell (sulphur) from exhaust

(See 01–03A–47 NO.26
EXHAUST SULPHUR SMELL
[ZM].)

27

Fuel refill concerns

Fuel tank does not fill smoothly.

(See 01–03A–48 NO.27 FUEL
REFILL CONCERNS [ZM].)

28

Fuel filling shut off issues

Fuel does not shut off properly.

(See 01–03A–49 NO.28 FUEL
FILLING SHUT OFF ISSUES
[ZM].)

29

Intermittent concerns

Symptom occurs randomly and is difficult to
diagnose.

(See 01–03A–49 NO.29
INTERMITTENT CONCERNS
[ZM].)

30

Constant voltage

Incorrect constant voltage

(See 01–03A–50 NO.30
CONSTANT VOLTAGE [ZM].)

31

Spark plug condition

Incorrect spark plug condition

(See 01–03A–52 NO.31
SPARK PLUG CONDITION
[ZM].)

32

ATX concerns

Upshift/downshift/
engagement

ATX concerns not related to engine
performance

(See 05–03–7 AUTOMATIC
TRANSAXLE SYMPTOM
TROUBLESHOOTING ITEM
TABLE.)

No.

TROUBLESHOOTING ITEM

DESCRIPTION

PAGE

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