Feedback Carburetor (FBC) System
FEEDBACK CARBURETOR SYSTEMInspection
If FBC system components (sensors, carburetor control unit computer, solenoid, etc.) fail. One of the following situations may be encountered.
1. Engine is hard to start or does not start at all.
2. Unstable idle.
3. Poor driveability.
If any of above conditions is noted, first perform basic engine checks (ignition system malfunctions, incorrect engine adjustment, etc. The FBC system can be checked by use of FBC checker and FBC harness connector. Inspection procedure is as follows.
CAUTION
(a) Before battery terminals are disconnected, make sure that ignition switch is OFF. If battery terminals are disconnected while engine is running or when ignition switch is in ON position, malfunction of computer could result.
(b) Disconnect battery cables before charging battery.
(c) When battery is connected, be sure not to reverse polarity.
(d) Make sure that harness connectors are securely connected. Take care not to allow entry of water or oil into connectors.
1. Turn ignition switch to OFF.
2. Remove the harness connector "A" (13 poles) and connector "B" (7 poles) from carburetor control unit (computer).
3. Set check switch of FBC checker to OFF.
4. Set select switch of checker to A.
5. Connect the FBC harness connector to the connectors of FBC checker, and then connect FBC harness connector to carburetor control unit and harness connectors. Place FBC checker on front passenger's seat.
6. Perform checks according to the "FBC System Check Procedure Chart".
7. If check shows any departure from specifications, check corresponding sensor and related electrical wiring, repair or replace.
8. After repair or replacement, recheck with FBC checker to confirm that repaired or replaced parts is performing well.
9. Set check switch of FBC checker to OFF.
10. Turn the ignition switch to OFF.
11. Disconnect connectors of FBC checker and FBC harness connector from carburetor control unit and body side harness connectors.
12. Connect body side harness connector to carburetor control unit.
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Part 2 Of 2:
Check Procedure Chart