EFI Control Unit
- Remove jumper wire from exhaust gas sensor terminal and leave connector at sensor disconnected. Start engine and operate at 2000 RPM under no-load condition.
- With exhaust gas sensor harness disconnected, monitor lamp on control unit should not glow. With harness connector terminal grounded, monitor lamp should glow.
- If monitor lamp does not operate as described, replace control unit. If good, proceed to "EXHAUST GAS OXYGEN SENSOR ".