SERVICE MANUAL NUMBER 23
FUEL INJECTION SYSTEM TROUBLESHOOTING
Page 5D-29
90-861326--1 MARCH 1999
Dieseling, Run-On Symptom
Step Action Value(s) Yes No
Definition: Engine continues to run after key is turned “OFF,” but runs very rough. If
engine runs smooth, check ignition switch and adjustment.
1
Was the “On-Board Diagnostic” (OBD)
System Check performed?
-
Go to
Step
2
Go to
OBD
System Check
2
Was visual/physical check performed?
-
Go to
Step
3
Go to
Visual/
Physical
Check
3
1. Check for leaking fuel injectors.
•
Refer to
Table A-4 in “General Sys-
tem Diagnostics” section.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
4
4
1. Check for proper operation of Igni-
tion Control (IC) circuit and the
Knock Sensor (KS) circuit.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
5
5
1. Check for obvious overheating
problems:
• Loose water pump belt.
• Faulty or incorrect water pump.
• Restriction in cooling system.
• Faulty or incorrect thermostat.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
6
6
1. Check for proper operation of the
EFI system relay.
•
Refer to
Table A-6 in “General Sys-
tem Diagnostics” section.
2. If a problem is found, repair as nec-
essary.
Was a problem found?
-
Go to
OBD
System
Check
Go to
Step
7
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