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3-20 FUEL SYSTEM (DFI)
Troubleshooting the DFI System
○
There are two ways to inspect the DFI system. One is
voltage Check Method and the other is Resistance Check
Method
.
(Voltage Check Method)
○
This method is conducted by measuring the input voltage
[B] to
a sensor [A] first, and then the output voltage [C]
from the sensor.
○
Sometimes this method can detect a fault of the ECU.
•
Refer
to each sensor inspection section for detail in this
chapter.
•
Use a fully charged battery and a digital meter [D] which
can b
e read two decimal places voltage or resistance.
(Resistance Check Method)
○
This method is simple. No need for a fully charged battery
and the needle adapter. Just do the following especially
when a sensor [A] is suspect.
•
Turn the ignition switch OFF and disconnect the connec-
tors.
•
Inspect the sensor resistance, using a digital meter (see
each sensor inspection in this chapter).
•
Inspect the wiring and connectors [B] for continuity, using
the hand tester [C] (analog tester) rather than a digital
meter.
Special Tool - Hand Tester: 57001–1394
If the sensor, the wiring and connections are good, in-
spect the ECU for its ground and power supply (see this
chapter). If the ground and power supply are good, the
ECU is suspect. Replace the ECU.