Файл: 92FWD_8A.pdf

GENERAL DESCRIPTION/INFORMATION

Another way of diagnosing charging system problems can be accomplished using the On Board Diagnostic System Fault Codes.

A Fault Code shows a potential problem in a monitored circuit,

or a condition caused by a faulty component. A Fault Code can be retrieved by turning the ignition switch ON-OFF-ON-OFF-ON without starting the engine, and counting the number of flashes of the CHECK ENGINE LAMP in the instrument cluster.

EXAMPLES:

²If the Check Engine Lamp flashes four times, pauses, and flashes one more time, a Code 41 is shown. The first set of four flashes indicates number four. The second set of one flash indicates one.

²If the Check Engine Lamp flashes four times, pauses, and flashes six more times, a Code 46 is shown. The first set of four flashes indicates number four. The second set of six flashes indicates six.

²If the Check Engine Lamp flashes four times, pauses, and flashes seven more times, a Code 47 is

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shown. The first set of four flashes indicates number four. The second set of seven flashes indicates seven.

ENGINE CONTROLLER

The Engine Controller is equipped with On Board Diagnostic features and monitors all engine control circuits during a run/drive period. If a circuit or sys-

Fig. 6 Engine Control Computer

tem does not perform properly, the Engine Controller will file in memory a preset Fault Code. This can be used to help in diagnosing a problem. After 50 to 100 ignition switch ON/RUN cycles, the memory will be erased if the fault does not reoccur.

The Engine Controller is located in the engine compartment outboard of the battery (Fig. 6).

Refer to Fig. 7 Alternator Fault Codes Chart for relationships of alternator/charging system Fault Code numbers.

DIAGNOSTIC TESTING USING FAULT CODES

For diagnostic testing when using the fault codes, refer to Fig.8 through 12.

DRB II DIAGNOSTIC TESTER

TESTING FAULT CODES

A more accurate device to retrieve fault codes is Diagnostic Tool (DRB II). This diagnostic tool, plugged into the diagnostic connector (Fig. 6) located near the battery, will display fault descriptions. The DRB II also can test various circuits and component functions. Refer to the instructions provided with the (DRB II) tool being used. Descriptions of Fault Codes for other vehicle systems can be found in the General Diagnosis sections of Group 14, Fuel System.