1993 Toyota 4Runner Engine Diagnostic tests

1993 TOYOTA 4RUNNER
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FBARR60
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I recently purchased a tool to perfom a basic review of any service codes necessary for my 3.0 V6 engine. The tool worked perfectly, revealing the same codes produced when I took the truck to the local dealership for a diagnostic test. The service codes revealed problems with the Mass Air-flow meter, O2 sensor and Intake Air Temp Sensor. The MAF and O2 sensors have been replaced and I am awaiting delivery of the IAT sensor. Per the instructions that came with tool, the procedure for resetting the Emissions computer is to pull the 15A fuse for 30 secs, warm up the engine and retest the engine diagnostics. When I perform these steps, and upon placing the tool in it correct diagnostic position, the Check Engine light flashes continuously without any pauses. Can you share any light as to what has happened?

Thanks,
Frank
Jan 4, 2006 at 6:17 AM
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STRAILER
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Yes, the check engine light will blink continually because there are no trouble codes to report.
Jan 4, 2006 at 6:19 AM
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FBARR60
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Thank you for the quick response - the manual that came with the tool did not mention what can be anticipated when there are no codes to report.
Jan 4, 2006 at 6:25 AM
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STRAILER
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No problem. ! :D
Jan 4, 2006 at 6:38 AM
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Suggested Repair

No repair is needed for the continuous check-engine-light flashing. After the emissions computer reset, a steady flash with no pauses indicates that no trouble codes are stored.

Conversation Summary

The owner of a 1993 Toyota 4Runner used a diagnostic tool that reported the same codes found by the dealership for the mass airflow meter, oxygen sensor, and intake air temperature sensor. After replacing the MAF and oxygen sensors and resetting the emissions computer by pulling the 15A fuse, the check engine light flashed continuously without pauses. The expert explained that continuous flashing means there are no trouble codes to report, and the owner noted that the tool manual had not described this no-code indication.

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