DR ALL-TERRAIN Service Manual download pdf (Page 88)

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3-24 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 s ensor [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 be 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).

•

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, inspect

the ECU for its ground and power supply (see ECU Power

Supply Inspection).

If the ground and power supply are good, the ECU is sus-

pect. Replace the ECU.

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DR ALL-TERRAIN Service Manual Page 88

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