Mazda MX-5 1990 Workshop Manual page 169

TROUBLESHOOTING GUIDE
F
STEP INSPECTION
ACTION
4
With condition of step 3, check if fuel line pres- Yes Go to Step 6
sure is held after ignition switch is turned OFF
L7
page F-102
Fuel line pressure: More than 147 kPa
(1.5 kg/cm
2
,
21 psi) for 5 min.
PRESSURE
No
Go to Step 5
MINIMUM
-----------------~
-
--
- - -
I
I
I
I ,
I
IGNITION
5 MIN.
TIME
SWITCH OFF
5 Gheck if fuel line pressure is held after ignition Yes Replace pressure regulator
c:::T
page F-112
switch is turned OFF and blocking outlet of pres-
No Check fuel pump hold pressure
c:::r
page F-107
sure regulator
C7
page F-111
9 If OK, check injector for fuel
Fuel line pressure:
leakage
c::::r
page F-113
More than 147 kPa (1.5 kg/cm
2
,
21 psi)
c:!>
If not OK, replace fuel pump
c:::r
page F-108
for 5 min.
6
Try
known good ECU and check if condition Yes
Replace ECU
improves
c:::r
page F-127
No Change fuel to another brand
05UOFX-021
F-25