Mazda MX-5 1990 Workshop Manual page 209

TROUBLESHOOTING GUIDE
STEP INSPECTION
4 Check if fuel cut operation is OK during de-
celeration
Fuel cut: Above 1,900 rpm after warm-up
5 Run engine several minutes at idle and check if
fuel line pressure is held after ignition switch
turned OFF
6
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Fuel line pressure: More than 147. kPa
(1.5 kg/cm
2 ,
21 psi) for 5 min.
Check if air cleaner element is clean
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7 Try known good ECU and check if condition im-
proves
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ACTION
Yes Go to next step
•
No Try known good ECU
Yes Go to next step
No Check injector for fuel leakage
Yes Go to next step
No Replace
F
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F-113
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05UOFX-043
F-65