Mazda Protege 5. Manual — part 87

SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]

01–03A–1

01–03A

01–03A SYMPTOM TROUBLESHOOTING [ENGINE
CONTROL SYSTEM (ZM)]

CONTROL SYSTEM DEVICE AND

RELATIONSHIP CHART [ZM] . . . . . . . 01–03A–2

Engine Control System . . . . . . . . . . . . 01–03A–2

FOREWORD [ZM] . . . . . . . . . . . . . . . . . . 01–03A–4
INTERMITTENT CONCERN

TROUBLESHOOTING [ZM] . . . . . . . . . 01–03A–4

Vibration Method . . . . . . . . . . . . . . . . . 01–03A–4
Water Sprinkling Method . . . . . . . . . . . 01–03A–6

SYMPTOM DIAGNOSTIC INDEX [ZM]. . 01–03A–7
SYMPTOM QUICK DIAGNOSIS

CHART [ZM] . . . . . . . . . . . . . . . . . . . . . 01–03A–9

NO.1 MELTING OF MAIN OR OTHER

FUSES [ZM] . . . . . . . . . . . . . . . . . . . . . 01–03A–13

NO.2 MIL ILLUMINATES [ZM] . . . . . . . . 01–03A–14
NO.3 WILL NOT CRANK [ZM] . . . . . . . . 01–03A–14
NO.4 HARD TO START/LONG

CRANK/ERRATIC START/ERRATIC
CRANK [ZM] . . . . . . . . . . . . . . . . . . . . . 01–03A–15

NO.5 ENGINE STALLS-AFTER

START/AT IDLE [ZM] . . . . . . . . . . . . . . 01–03A–18

NO.6 CRANKS NORMALLY BUT

WILL NOT START [ZM] . . . . . . . . . . . . 01–03A–21

NO.7 SLOW RETURN TO IDLE [ZM] . . . 01–03A–24
NO.8 ENGINE RUNS

ROUGH/ROLLING IDLE [ZM]. . . . . . . . 01–03A–25

NO.9 FAST IDLE/RUNS ON [ZM] . . . . . . 01–03A–27
NO.10 LOW IDLE/STALLS DURING

DECELERATION [ZM] . . . . . . . . . . . . . 01–03A–28

NO.11 ENGINE STALLS/QUITS,

ENGINE RUNS ROUGH, MISSES,
BUCK/JERK, HESITATION/STUMBLE,
SURGES [ZM] . . . . . . . . . . . . . . . . . . . . 01–03A–29

NO.12 LACK/LOSS OF POWER-

ACCELERATION/CRUISE [ZM] . . . . . . 01–03A–32

NO.13 KNOCKING/PINGING-

ACCELERATION/CRUISE [ZM] . . . . . . 01–03A–34

NO.14 POOR FUEL ECONOMY [ZM]. . . 01–03A–35
NO.15 EMISSION COMPLIANCE [ZM] . 01–03A–37
NO.16 HIGH OIL

CONSUMPTION/LEAKAGE [ZM] . . . . . 01–03A–38

NO.17 COOLING SYSTEM

CONCERNS-OVERHEATING [ZM] . . . 01–03A–39

NO.18 COOLING SYSTEM

CONCERNS-RUNS COLD [ZM] . . . . . . 01–03A–40

NO.19 EXHAUST SMOKE [ZM] . . . . . . . . 01–03A–41
NO.20 FUEL ODOR

(IN ENGINE COMPARTMENT) [ZM] . . . 01–03A–43

NO.21 ENGINE NOISE [ZM] . . . . . . . . . . 01–03A–44
NO.22 VIBRATION CONCERNS

(ENGINE) [ZM] . . . . . . . . . . . . . . . . . . . . 01–03A–45

NO.23 A/C DOES NOT WORK

SUFFICIENTLY [ZM] . . . . . . . . . . . . . . . 01–03A–45

NO.24 A/C IS ALWAYS

ON/A/C COMPRESSOR RUNS
CONTINUOUSLY [ZM] . . . . . . . . . . . . . . 01–03A–46

NO.25 A/C DOES NOT CUT OFF

UNDER WIDE OPEN THROTTLE
CONDITIONS [ZM] . . . . . . . . . . . . . . . . . 01–03A–47

NO.26 EXHAUST SULPHUR

SMELL [ZM] . . . . . . . . . . . . . . . . . . . . . . 01–03A–47

NO.27 FUEL REFILL

CONCERNS [ZM] . . . . . . . . . . . . . . . . . . 01–03A–48

NO.28 FUEL FILLING SHUT OFF

ISSUES [ZM] . . . . . . . . . . . . . . . . . . . . . 01–03A–49

NO.29 INTERMITTENT

CONCERNS [ZM] . . . . . . . . . . . . . . . . . . 01–03A–49

NO.30 CONSTANT VOLTAGE [ZM] . . . . 01–03A–50
NO.31 SPARK PLUG

CONDITION [ZM] . . . . . . . . . . . . . . . . . . 01–03A–52

ENGINE CONTROL SYSTEM OPERATION

INSPECTION [ZM] . . . . . . . . . . . . . . . . . 01–03A–55

Evaporative System Leak Inspection

Using Leak Tester . . . . . . . . . . . . . . . . 01–03A–55

Evaporative System Leak Inspection

Using Vacuum Pump . . . . . . . . . . . . . 01–03A–56

Main Relay Operation Inspection . . . . . 01–03A–56
Intake Manifold Vacuum Inspection . . . 01–03A–57
Idle Air Control (IAC) Inspection . . . . . . 01–03A–57
Variable Tumble Control System

(VTCS) Inspection. . . . . . . . . . . . . . . . 01–03A–58

Pressure Regulator Control Inspection . 01–03A–59
Fuel Injector Operation Inspection . . . . 01–03A–60
Spark Test . . . . . . . . . . . . . . . . . . . . . . . 01–03A–60

End of Toc

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]

01–03A–2

CONTROL SYSTEM DEVICE AND RELATIONSHIP CHART [ZM]

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Engine Control System

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]

01–03A–3

01–03A

Monitoring System

End Of Sie

Y3U103WA6

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (ZM)]

01–03A–4

FOREWORD [ZM]

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•

When the customer reports a vehicle malfunction, check the malfunction indicator light (MIL) and diagnostic
trouble code (DTC), then diagnose the malfunction according to following flowchart.
— If the DTC exists, diagnose the applicable DTC inspection. (See 01–02A–15 DTC TABLE [ZM].)
— If the DTC does not exist and the MIL does not illuminate or flash, diagnose the applicable symptom

troubleshooting. (See 01–03A–7 SYMPTOM DIAGNOSTIC INDEX [ZM].)

*

: Malfunction Indicator Light (MIL), Generator Warning Light, Security Light

End Of Sie

INTERMITTENT CONCERN TROUBLESHOOTING [ZM]

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Vibration Method

•

If malfunction occurs or becomes worse while driving on a rough road or when engine is vibrating, perform the
steps below.

Note

•

There are several reasons vehicle or engine vibration could cause an electrical malfunction. Some of the
things to check for are:
— Connectors not fully seated.
— Wire harnesses not having full play.
— Wires laying across brackets or moving parts.
— Wires routed too close to hot parts.

•

An improperly routed, improperly clamped, or loose harness can cause wiring to become pinched
between parts.

•

The connector joints, points of vibration, and places where wire harnesses pass through the firewall, body
panels, etc. are the major areas to be checked.

Y3U103WA7

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