GENERAL SYSTEM DIAGNOSTICS
SERVICE MANUAL NUMBER 23
90-861326--1 MARCH 1999 Page 5E-75
Chart A-4 (4 of 5): Fuel System DiagnosisContinued)
7
1. Ignition “OFF” for 10
seconds.
2. Ignition “ON.”
3. Block fuel pressure
line between the fuel
pump and fuel rail us-
ing fuel shut-off valve
tool.
Does fuel pressure
hold?
–
Go to
Step
18
Go to
Step
8
8
1. Ignition “OFF” for 10
seconds.
2. Ignition “ON.”
3. Block fuel return line
using fuel shut-off
valve tool.
Does fuel pressure
hold?
–
Go to
Step
16
Go to
Step
15
9
Is fuel pressure below
specified value?
34 psi (234 kPa)
Go to
Step
10
Go to
Step
12
10
Check for restricted fuel
lines. If a problem is
found, repair as neces-
sary.
Was a problem found?
–
Go to
OBD
System Check
Go to
Step
11
11
1. Ignition “OFF”
2. Block fuel return line
using fuel shut-off
valve tool.
3. Ignition “ON.”
Does fuel pressure rise
above the specified
value?
38 psi (262 kPa)
Go to
Step
16
Go to
Step
18
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