Journey FWD V6-3.5L (2009)
Sensor Return - PCM Input
SENSOR RETURN - PCM INPUT
The sensor return circuit provides a low electrical noise ground reference for all of the systems sensors. The sensor return circuit connects to internal
ground circuits within the Powertrain Control Module (PCM).
PCM Replacement
PCM REPLACEMENT
DESCRIPTION
Use the scan tool to reprogram the new pcm with the vehicle's original identification number (vin) and the vehicle's original mileage. If this step
is not done a Diagnostic Trouble Code (DTC) may be set.
PCM Ground
PCM GROUND
Ground is provided through multiple pins of the PCM connector. Depending on the vehicle there may be as many as two different ground pins. There are
power grounds and sensor grounds.
The power grounds are used to control the ground side of relays, solenoids, ignition coil or injectors. The signal ground is used for any input that uses
sensor return for ground, and the ground side of any internal processing component.
The PCM case is shielded to prevent RFI and EMI. The PCM case is grounded and must be firmly attached to a good, clean body ground.
Internally all grounds are connected together, however there is noise suppression on the sensor ground. For EMI and RFI protection the housing and
cover are also grounded via the mounting screws AND bracket to the chassis, separately from the ground pins.
