Firebird V6-3.8L VIN K (1995)
Engine Control Module: Component Tests and General Diagnostics
To read and clear diagnostic trouble codes, use a scan tool.
NOTE: Use of a scan tool is recommended to clear diagnostic trouble codes from the PCM memory. Diagnostic trouble codes can also be cleared by
turning "OFF" the ignition and disconnecting the battery power from the PCM for 30 seconds, but this method will also cause all diagnostic information
in the PCM memory to be cleared and all the diagnostic tests will have to be re-run.
If a diagnostic chart indicates that the PCM connections or PCM is the cause of a problem and the PCM is replaced, but does not correct the problem,
one of the following may be the reason:
^
There is a problem with the PCM terminal connections. The diagnostic chart will say PCM connections or PCM. The terminals may have to be
removed from the connector in order to check them properly.
^
EEPROM program is not correct for the application. Incorrect components may cause a malfunction and may or may not set a DTC.
^
The problem is intermittent. This means that the problem is not present at the time the system is being checked. In this case, refer to
Symptoms and make a careful physical inspection of all portions of the system involved. See: Powertrain Management/Computers and
Control Systems/Testing and Inspection
^
Shorted solenoid, relay coil, or harness. Solenoids and relays are turned "ON" and "OFF" by the PCM using internal electronic switches called
drivers. Each driver is part of a group of seven called Output Driver Modules. A shorted solenoid, relay coil, or harness will not damage the
PCM but will cause the solenoid or relay to be inoperative. The J 34636 tester, or equivalent, provides a fast, accurate means of checking for a
shorted coil or a short to battery voltage.
