VUE FWD V6-3.6L Hybrid (2009)
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Auxiliary transmission fluid pump (ATFP) control module
These modules diagnose their own operation and determine when a fault condition is present. Diagnostic status is communicated to the HPCM through
the following circuits:
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APM utilizes the GM Hi-speed, Hybrid LAN communication circuit
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BECM utilizes the GM Hi-speed, Hybrid LAN communication circuit
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Each MCM and the HPCM exchange information and commands on the SPI bus internal communication circuit as well as the hi-speed hybrid
GMLAN communication circuit.
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ATFP control module utilizes a dedicated diagnostic status circuit
In the event a hosted module communicates a fault condition, the HPCM will determine if hybrid operation is effected and notify the vehicle operator by
requesting the MIL illuminate and/or by displaying a hybrid service required message. In addition, the HPCM will store the associated DTC information
for retrieval by a scan tool. Some hosted modules may require an ignition cycle to clear certain DTCs from the HPCM.
Circuit Inputs
In addition to GMLAN parameters, the HPCM directly monitors the following signal circuits:
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Transmission shift selector internal mode switch (IMS) Direction and Park/Neutral switch signals
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Engine crankshaft position (CKP) sensor signal
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ATFP diagnostic circuit
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High voltage interlock circuit (HVIC)
Circuit Outputs
In addition to GMLAN and SPI bus commands, the HPCM directly controls the following output circuits:
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ATFP control circuit
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BECM high voltage contactor relay pulse width modulated (PWM) control circuit
Motor Control Module (MCM) 1 and 2
Location
Each electric motor generator located within the transmission assembly is controlled by its own motor control module (MCM) flash-programmable,
micro-processor. Each MCM is contained within the PIM. Also contained within the PIM is the hybrid powertrain control module (HPCM)
micro-processor.
Operating Functions
Each MCM operates the applicable electric motor generator based upon HPCM commands. Each MCM controls the speed, direction and output torque
of its respective traction motor through the sequencing actuation of high current switching transistors called insulated gate bipolar transistors (IGBTs).
Communication and Hosted Diagnostics
In addition to the internal SPI bus communication circuit between the HPCM and each MCM, the MCMs also communicate on the Hi-speed and Hybrid
GMLAN communication circuits. The MCM does not store its own diagnostic trouble code (DTC) information. The HPCM will store MCM associated
DTC information for retrieval by a scan tool. The scan tool can communicate directly with each MCM in order to retrieve data parameters only.
Circuit Inputs
In addition to GMLAN parameters, each MCM monitors its respective motor generator for voltage, current, speed, direction and temperature.
Additionally, the MCM monitors the IGBT components for temperature and proper operation. Some of the MCM operation data is shared with the
HPCM.
Circuit Outputs
Each MCM controls its respective IGBT driver board that in-turn controls each motor generator. The motor generators operate using three-phase
alternating current (AC) electricity. Three cables connect each motor generator to the PIM. Each individually shielded cable is orange in color to alert
the technician that the potential for high voltage is present.
Accessory DC Power Control Module (APM)
Location
