ELECTRONIC CONTROL SYSTEM 1. Before removing EFI wiring connectors, terminals, etc., first disconnect the power by either turning the ignition switch OFF or disconnecting the battery terminals. HINT: Always check the diagnosis code before disconnecting the battery terminal. 2. When installing the battery, be especially careful not to incorrectly connect the positive and negative cables. 3. Do not jolt parts during removal or installation. Handle all EFI parts carefully, especially the ECU. 4. Do not be careless during troubleshooting as there are numerous transistor circuits and contact with terminals can cause further trouble. 5. Do not open the ECU cover. 6. When inspecting during rainy weather, take care to prevent water from entering. Also, when washing the engine compartment, prevent water from getting on EFI parts and wiring connectors. 7. Parts should be replaced as an assembly. 8. Care is required when pulling out the inserting wiring connectors. (a) Release the lock and pull out the connector. Pull on the connectors, not the wiring. (b) Fully insert the connector and check that it is locked. 9. When inspecting a connector with a circuit tester. (a) Carefully take out the water-proofing rubber if it is a water-proof type connector.