SERVICE MANUAL NUMBER 23
FUEL INJECTION SYSTEM TROUBLESHOOTING
Page 5D-25
90-861326--1 MARCH 1999
Rough, Unstable, or Incorrect Idle, Stalling Symptom (Continued)
11
1. Check for fuel in pressure regulator
vacuum hose.
2. If fuel is present, replace the fuel
pressure regulator assembly.
•
Refer to
Fuel Metering System in
“Description and System Operation”
section.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
11-16
Volts
Go to
OBD
System
Check
Go to
Step
12
12
1. Check for intermittent opens or short
to grounds in the ECT sensor, MAP
sensor and TP sensor circuits. Also
check or throttle linkage sticking,
binding or worn.
2. An intermittent failure may not store
a DTC.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
13
13
1. Check ECM grounds for being
clean, tight and in their proper loca-
tions.
2. Also check that battery cables and
ground straps are clean nd secure.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
14
14
1. Check fuel delivery system items
that can cause the engine to run rich.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
15
15
1. Check fuel delivery system items
that can cause the engine to run
lean.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
16
16
1. Check or proper alternator voltage
output.
2. The voltage should be between spe-
cified values.
3. If a problem is found, repair as nec-
essary.
Was a problem found?
11-16
Volts
Go to
OBD
System
Check
Go to
Step
17
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