Mazda Protege 5. Manual — part 102

SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]

01–03B–1

01–03B

01–03B SYMPTOM TROUBLESHOOTING [ENGINE
CONTROL SYSTEM (FS)]

CONTROL SYSTEM DEVICE AND CONTROL

RELATIONSHIP CHART [FS]. . . . . . . . 01–03B–2

Engine Control System . . . . . . . . . . . . 01–03B–2
Monitoring System . . . . . . . . . . . . . . . . 01–03B–3

FOREWORD [FS] . . . . . . . . . . . . . . . . . . 01–03B–4
INTERMITTENT CONCERN

TROUBLESHOOTING [FS]. . . . . . . . . . 01–03B–4

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

SYMPTOM DIAGNOSTIC INDEX [FS] . . 01–03B–7
SYMPTOM QUICK DIAGNOSIS CHART

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–9

NO.1 MELTING OF MAIN OR OTHER

FUSES [FS] . . . . . . . . . . . . . . . . . . . . . . 01–03B–13

NO.2 MIL ILLUMINATES [FS] . . . . . . . . 01–03B–14
NO.3 WILL NOT CRANK [FS] . . . . . . . . 01–03B–14
NO.4 HARD START/LONG CRANK/ERRATIC

START/ERRATIC CRANK [FS] . . . . . . 01–03B–15

NO.5 ENGINE STALLS-AFTER START/AT IDLE

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–17

NO.6 CRANKS NORMALLY BUT WILL NOT START

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–20

NO.7 SLOW RETURN TO IDLE [FS] . . . 01–03B–22
NO.8 ENGINE RUNS ROUGH/ROLLING IDLE

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–23

NO.9 FAST IDLE/RUNS ON [FS] . . . . . . 01–03B–26
NO.10 LOW IDLE/STALLS DURING

DECELERATION [FS]. . . . . . . . . . . . . . 01–03B–26

NO.11 ENGINE STALLS/QUITS, ENGINE RUNS

ROUGH, MISSES, BUCK/JERK, HESITATION/
STUMBLE, SURGES [FS]. . . . . . . . . . . 01–03B–28

NO.12 LACK/LOSS OF POWER-ACCELERATION/

CRUISE [FS] . . . . . . . . . . . . . . . . . . . . . 01–03B–31

NO.13 KNOCKING/PINGING-ACCELERATION/

CRUISE [FS] . . . . . . . . . . . . . . . . . . . . . 01–03B–33

NO.14 POOR FUEL ECONOMY [FS] . . . 01–03B–34
NO.15 EMISSION COMPLIANCE [FS] . . 01–03B–36
NO.16 HIGH OIL CONSUMPTION/LEAKAGE

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–37

NO.17 COOLING SYSTEM

CONCERNS-OVERHEATING [FS] . . . . 01–03B–38

NO.18 COOLING SYSTEM CONCERNS-RUNS

COLD [FS] . . . . . . . . . . . . . . . . . . . . . . . 01–03B–40

NO.19 EXHAUST SMOKE [FS] . . . . . . . . 01–03B–41
NO.20 FUEL ODOR (IN ENGINE COMPARTMENT)

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–42

NO.21 ENGINE NOISE [FS] . . . . . . . . . . . 01–03B–43
NO.22 VIBRATION CONCERNS (ENGINE)

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–44

NO.23 A/C DOES NOT WORK SUFFICIENTLY

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–44

NO.24 A/C IS ALWAYS ON OR A/C COMPRESSOR

RUNS CONTINUOUSLY [FS] . . . . . . . . 01–03B–45

NO.25 A/C IS NOT CUT OFF UNDER WIDE OPEN

THROTTLE CONDITIONS [FS] . . . . . . . 01–03B–46

NO.26 EXHAUST SULPHUR SMELL

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–46

NO.27 FUEL REFILL CONCERNS

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–47

NO.28 FUEL FILLING SHUT OFF ISSUES

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–48

NO.29 INTERMITTENT CONCERNS

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–48

NO.30 REFERENCE VOLTAGE [FS] . . . 01–03B–49
NO.31 SPARK PLUG CONDITION

[FS] . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–51

ENGINE CONTROL SYSTEM OPERATION

INSPECTION [FS] . . . . . . . . . . . . . . . . . 01–03B–54

Evaporative System Leak Inspection Using Leak

Tester . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–54

Evaporative System Leak Inspection Using Vacuum

Pump. . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–55

Main Relay Operation Inspection . . . . . 01–03B–55
Intake Manifold Vacuum Inspection . . . 01–03B–56
Idle Air Control (IAC) Inspection . . . . . . 01–03B–56
VICS Operation Inspection . . . . . . . . . . 01–03B–57
Variable Tumble Control System (VTCS) Inspection

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 01–03B–57

Pressure Regulator Control Inspection . 01–03B–58
Fuel Injector Operation Inspection . . . . 01–03B–59
Spark Test . . . . . . . . . . . . . . . . . . . . . . 01–03B–59

End of Toc

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]

01–03B–2

CONTROL SYSTEM DEVICE AND CONTROL RELATIONSHIP CHART [FS]

A3U010318881W01

Engine Control System

Component

Input

Brake switch

x

x

Refrigerant pressure switch, A/C
switch, blower fan switch and A/C
amplifier

x

x

x

x

x

PSP switch

x

x

x

x

DLC in engine compartment (TEN)

x

x

x

x

x

Neutral switch (MTX)

x

x

x

x

Clutch switch (MTX)

x

x

x

x

TR switch (ATX)

x

x

x

x

CKP sensor

x

x

x

x

x

x

x

x

x

x

x

x

x

CMP sensor

x

x

x

VSS

x

x

x

x

x

MAF sensor

x

x

x

x

x

x

x

ECT sensor

x

x

x

x

x

x

x

x

x

x

x

IAT sensor

x

x

x

x

x

x

x

x

TP sensor

x

x

x

x

x

x

x

x

x

x

EGR boost sensor

x

x

x

x

Battery positive voltage

x

x

x

x

x

Generator

x

x

x

HO2S (front)

x

x

HO2S (rear)

Output

IAC valve

x

A/C relay

x

Cooling fan relay

x

Condencer fan relay

x

Fuel pump relay

x

PRC solenoid valve

x

Purge solenoid valve

x

VTCS solenoid valve

x

EGR valve

x

HO2S heater

x

x

Ignition coils

x

Fuel injectors

x

Generator (field coil)

x

Generator warning light

x

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]

01–03B–3

01–03B

Monitoring System

End Of Sie

Y3U103WA6

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SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]

01–03B–4

FOREWORD [FS]

A3U010318881W02

•

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 01–02B–15 DTC TABLE [FS].)
— If the DTC does not exist and the MIL does not illuminate or flash, diagnose the applicable symptom

troubleshooting. (See 01–03B–7 SYMPTOM DIAGNOSTIC INDEX [FS].)

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

End Of Sie

INTERMITTENT CONCERN TROUBLESHOOTING [FS]

A3U010318881W03

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 fire wall, body
panels, etc. are the major areas to be checked.

YMU102WBX

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