Misfire History Cyl. #1 - #8
The scan tool displays in counts. This parameter displays the total level of cylinder misfires that have
been calculated for each cylinder by the control module. This parameter will not update or show activity
until a misfire DTC has become active. The misfire history counters will update every 200 cylinder firing
events.
Not Run Counter
The scan tool displays the number of times a DTC diagnostic has not reached the predetermined criteria
in order to run since the first DTC run failure.
Pass Counter
The scan tool displays the number of times a DTC has run and passed.
PCM Reset
The scan tool displays Yes or No. This parameter indicates when the internal PCM resets. The scan tool
displays YES when an internal PCM reset occurred. The scan tool displays NO under the normal
operating conditions.
PCM/VCM in VTD Fail Enable
The scan tool displays Yes or No. The scan tool displays Yes if the body control module (BCM) and the
control module lose communications with each other after the BCM sends the correct password. The scan
tool displays No if the BCM is communicating the correct password to the PCM.
Power Enrichment
Scan tool displays ACTIVE or INACTIVE. ACTIVE displayed indicates that the control module has
detected conditions appropriate to operate in Power Enrichment mode. The control module commands
Power Enrichment mode when a large increase in throttle position and load is detected. While in Power
Enrichment, the control module will increase the amount of fuel delivered by entering Open Loop and
increasing the injector pulse width.
Reduced Engine Power
The scan tool displays Active or Inactive. The scan tool displays Active when the control module receives
a signal from the TAC module that a throttle actuator control system fault is occurring. The scan tool
displays inactive when the engine is operating normally.
Short Term FT Avg. Bn1
The scan tool displays %. This parameter indicates the average short term fuel trim for this bank. The
scan tool will display a value more than 0 if the time is being added to the injector pulse width, increasing
the amount of fuel to that bank of the engine to compensate for a lean condition sensed by the oxygen
2004 Hummer H2
2004 ENGINE PERFORMANCE Engine Controls (Diagnostic Information & Procedures) - 4.8L, 5.3L, and 6.0L -
Hummer H2