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Whilst perusing the pages of my treasured Nissan '87 Pulsar Factory Service Manual, I discovered a 'fail-safe' to the E16i:
If, for any reason, you find that your TBI-equipped car won't go beyond 2400-2500 RPMs, it is because your heated airflow sensor has failed. When this happens, your ECM will store a Code 12 in the Mode III Diagnostic memory bank and it will tell the Throttle Position Sensor to take over for the failed component. Your RPMs will be limited to 2400-2500 RPMs to tell you this has occurred. Kewl, eh?
If, for any reason, you find that your TBI-equipped car won't go beyond 2400-2500 RPMs, it is because your heated airflow sensor has failed. When this happens, your ECM will store a Code 12 in the Mode III Diagnostic memory bank and it will tell the Throttle Position Sensor to take over for the failed component. Your RPMs will be limited to 2400-2500 RPMs to tell you this has occurred. Kewl, eh?