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EFI SYSTEM —
Troubleshooting
FI-9
TROUBLESHOOTING
TROUBLESHOOTING HINTS
1.
Engine troubles are usually not caused by the EFI system.
When troubleshooting, always first check the condition
of the other systems.
(a)
Electronic source
• Battery
• Fusible links
• Fuses
(b)
Body ground
(c)
Fuel supply
• Fuel leakage
• Fuel filter
• Fuel pump
(d)
Ignition system
• Spark plugs
• High-tension cords
• Distributor
• Ignition coil
• Igniter
(e)
Air induction system
• Vacuum leaks
(f)
Emission control system
• PCV system
• EG R system
• Al system
(g)
Others
• Ignition timing (ESA system)
• Idle speed (ISC system)
• etc.
2.
The most frequent cause of problems is simply a bad
contact in wiring connectors. Always check that connec-
tions are secure.
When inspecting the connector, pay particular attention
to the following points:
(a)
Check to see that the terminals are not bent.
(b)
Check to see that the connector is pushed in com-
pletely and locked.
(c)
Check to see that there is no signal change when the
connector is slightly tapped or wiggled.
3.
Sufficiently troubleshoot for other causes before replac-
ing the ECU, as the ECU is of high quality and it is
expensive.
N
ProCarManuals.com
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