B3000 V6-3.0L (2007)
Engine Control Module: Programming and Relearning
Powertrain Control Module (PCM) Reset
Powertrain Control Module (PCM) Reset
Description
All OBD-II scan tools support the PCM reset.
The PCM reset allows the scan tool to command the PCM to clear all emission-related diagnostic information. When resetting the PCM, a DTC P1000
will be stored in the PCM until all the OBD II system monitors or components have been tested to satisfy a drive cycle, without any other faults
occurring. For more information about a drive cycle, See DRIVE CYCLES. See: Computers and Control Systems/Testing and Inspection/Monitors,
Trips, Drive Cycles and Readiness Codes/Drive Cycles
The following events occur when a PCM reset is performed:
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Clears the number of DTCs
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Clears the DTCs
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Clears the freeze frame data
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Clears diagnostic monitoring test results
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Resets status of the OBD II system monitors
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Sets DTC P1000
NOTE: When using the IDS or equivalent tester to perform a PCM reset, press the CLEAR button. This function is performed only after retrieval of
continuous DTCs.
Resetting Keep Alive Random Access Memory (RAM)
Resetting Keep Alive Random Access Memory (RAM)
Resetting keep alive RAM will return PCM memory to its default setting. Adaptive learning contents such as idle and fuel trim are included.
After keep alive RAM has been reset, the vehicle may exhibit certain driveability concerns. It will be necessary to drive the vehicle to allow the PCM to
releam values for optimum driveability and performance.
A keep alive RAM reset is done as follows:
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During KOEO with the IDS or equivalent tester, use the reset keep alive memory function. This is found in the Active Command Modes menu on
the IDS or equivalent tester.
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If a generic scan tool is used, this function may not be supported. See scan tool manufacturer's instruction manual.
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If an error message is received or the scan tool does not support this function, disconnecting the negative battery cable for a minimum of 5
minutes may be used as an alternative procedure.
Resetting Keep Alive Memory (KAM)
Resetting Keep Alive Memory (KAM)
Resetting keep alive memory will return PCM memory to its default setting. Adaptive learning contents such as idle speed, refueling event, and fuel trim
are included. A PCM reset is also part of a KAM reset. Both can be useful in post repair retest.
After keep alive memory has been reset, the vehicle may exhibit certain driveability concerns. It will be necessary to drive the vehicle to allow the PCM
to releam values for optimum driveability and performance. This function may not be supported by all scan tools. See the IDS or equivalent tester
manufacturer instruction manual.
If an error message is received or the scan tool does not support this function, disconnecting the battery ground cable for a minimum of 5 minutes may
be used as an alternative procedure.
