Trooper LS V6-3.5L (1998)
Engine Control Module: Component Tests and General Diagnostics
EEPROM Functional Check
1. Perform the On-Board Diagnostic System Check.
2. Start the engine and run for one minute.
3. Scan for DTCs using the scan tool.
Powertrain Control Module (PCM) Diagnosis
To read and clear diagnostic trouble codes, use a scan tool.
IMPORTANT: 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 the ignition "OFF" and disconnecting the battery power from the PCM for 30 seconds. Turning off the ignition and disconnecting
the battery power from the PCM will cause all diagnostic information in the PCM memory to be cleared. Therefore, all the diagnostic tests will have to
be re-run.
Since the PCM can have a failure which may affect only one circuit, following the diagnostic procedures will determine which circuit has a problem
and where it is.
If a diagnostic chart indicates that the PCM connections or the PCM is the cause of a problem, and the PCM is replaced, but this does not correct the
problem, one of the following may be the reason:
-
There is a problem with the PCM terminal connections. 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 or reprogramming the PCM with the wrong EEPROM program 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 the Symptoms
portion of the manual and make a careful physical inspection of all component and wiring associated with the affected system.
-
There is a shorted solenoid, relay coil, or harness. Solenoids and relays are turned "ON" and "OFF" by the PCM using internal electronic switches
called drivers. A shorted solenoid, relay coil, or harness will not damage the PCM but will cause the solenoid or relay to be inoperative.
