Nissan Sentra/Pulsar/NX 1982-1996 Repair Guide

Electronic Controlled Carburetor (ECC) Engines


See Figures 1, 2 and 3

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Fig. Fig. 1: ECC inspection connector location

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Fig. Fig. 2: ECC inspection lamp location

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Fig. Fig. 3: ECC inspection lamp diagnostic chart

Engines equipped with an electronically controlled carburetor use an ECM that does not store trouble codes. However, the system does provide some self-diagnostic capabilities. By observing the ECC system inspection lamp, located on the instrument panel, some basic system operating information can be obtained. Use the following procedure to evaluate system operation.

  1. Check the ECU and oxygen sensor harness connector for damage or corrosion.
  3. Verify the ECC the inspection harness connector is disconnected.
  5. Turn the ignition switch ON and check the ECC inspection light on the instrument panel. If the bulb does not light, replace the bulb or repair wiring.
  7. If the light stays ON , start the engine and warm.
  9. Run the engine to 2000 rpm, for about 5 minutes. If the light goes OFF , there is no trouble.
  11. If the light stays ON , turn the engine OFF and connect the Electronic Controlled Carburetor (ECC) test connector near the wiper motor.
  13. Run the engine at idle to receive lighting intervals. If no light exists, check for an opening in the oxygen sensor circuit.
  15. If the light comes ON , check the lighting intervals and compare the reading to the ECC inspection lamp diagnostic chart.
  17. Proceed with testing of the appropriate components, according to the results received in Step 7.