Mazda MX-5 1990 Workshop Manual page 161

TROUBLESHOOTING GUIDE
Troubleshooting chart
7 CRANKS NORMALLY BUT HARD TO START - AFTER WARM·UP
• Engine cranks at normal speed but requires excessive cranking time (more than 5 sec.) before starting after
OESeRlp· running and hot soaked
TION • Battery is normal condition
• Engine starts normally when cold
[TROUBLESHOOTING HINTS]
CD
Air/Fuel mixture too rich
• Insufficient fuel injection control
• Injector fuel leakage
STEP INSPECTION
Check if "00" is displayed on Self-Diagnosis
Checker with ignition switch
ON
a
page F-78
SELECT SW A
2
DESCRIPTION:
®
Vapor lock
• Fuel pressure is not held in fuel line after engine stops
• High RVP (winter) fuel is used in warm weather
ACTION
Yes Go to next step
No Malfunction Code No. displayed
Check for cause (Refer to specified
check sequence)
"00" flashes
Check ECU terminal 1 F voltage
Voltage: Approx. 12V
(Ignition switch ON)
r::::r page F-78
r::::r page F-128
c;:,
If OK. replace ECU r::::r page F-127
¢
If not
OK.
check wiring between
ECU and Self-Diagnosis Checker
0"
page F-7
F
05UOFX-015
Further describes the symptom. Confirm that the chart addresses the actual symptom before beginning
troubleshooting.
TROUBLESHOOTING HINTS:
This describes the possible point of malfunction.
STEP:
This shows the order of troubleshooting. Proceed with troubleshooting as indicated.
INSPECTION=
This describes an inspection to quickly determine the malfunction of parts. If a detailed procedure is necessary
to perform the INSPECTION, refer to the page shown by the
"c::::r"
mark.
ACTION:
This recommends the appropriate action to take as a result (Yes/No) of the INSPECTION. How to perform
the action is described on the reference page shown by the'
'L7"
mark.
05UOFX-016
F-17