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Diagnostic Circuit Check

NOTE: If battery terminals are disconnected while engine is running or when ignition switch is in "ON" position, malfunction of computer or damage to semi-conductors could result.
  1. Turn ignition switch to "OFF" position. Remove harness connectors "A" and "B" from Carburetor Control Unit (CCU). See Fig 1 .
  2. Set check switch of Feedback Carburetor Checker (09341-21000) to "OFF" position.See Fig 2 .
  3. Set select switch of checker to "A" position. See Fig 3 . Connect FBC wiring harness connector to connectors of FBC checker.
  4. Connect FBC connector to CCU connectors. Perform checks according to FBC Systems Check Chart.
  5. If checker shows variation from specifications, check defective sensor and electrical wiring. Repair or replace defective components.
  6. After repair or replacement of defective components, recheck system with checker. Set check switch of checker to "OFF" position.
  7. Set ignition switch to "OFF" position. Disconnect all harness connectors and reinstall in proper harness connectors.
Fig 1: Feedback Carburetor (FBC) System
G61513
Fig 2: FBC Systems Check Procedure Chart
G61514
Fig 3: Carburetor Control Unit Connectors
G61516
Fig 4: FBC Checker & Harness Connectors
G48148
Fig 5: FBC Checker
G48149
Fig 6: Oxygen Sensor Checker
G61518
Fig 7: Jet Mixture Solenoid Checker
G61517
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