Grand Caravan L4-2.4L DOHC (1996)
Control Module: Description and Operation
Circuit Operation
CIRCUIT OPERATION
Power for the Transmission Control Module (TCM) is supplied from three sources. One is a direct battery feed on circuit A5. This circuit is
protected by a 20 amp fuse located in the Power Distribution Center (PDC) cavity 14. This circuit is also spliced and supplies power for the
transmission control relay.
Power is also supplied, to the TCM, on circuit F45. This is the power supply is for the engine starter relay, coil side, and is HOT in the START
position only. The F45 circuit is protected by a 3 amp Positive Temperature Coefficient (PTC) located in PTC cavity 10 of the junction block.
Power for the PTC is supplied on circuit A41 from the ignition switch. Battery voltage for the A41 circuit is supplied by circuit Al when the
ignition switch is in the START position.
The A1 circuit originates in the Power Distribution Center (PDC) and is protected by a 40 amp fuse located in cavity 5.
Circuit F11 also supplies power to the TCM and is HOT when the ignition switch is in the OFF/RUN/START position. This circuit is protected by
a 10 amp fuse located in the cavity 2 of the junction block. Power for the fuse is supplied on circuit A81. This circuit, A81, is powered by circuit
M1 from the PDC.
Circuit M1 is protected by a 10 amp fuse located in cavity 10 of the PDC.
Ground for the TCM is supplied on the Z13 circuit, which is a power ground, and circuit Z14, which is a signal ground. These ground circuits are
spliced in with several other ground circuits and terminate at the body ground under the battery tray and the engine ground located on the engine
block.
The CCD Data Bus is used to allow the controller to communicate with other controllers and the universal data link connector. The circuits
involved are, D1 for CCD (+), and D2 for CCD (-).
Circuits D6 and D21 are also used to allow the TCM to communicate with other controllers and the universal data link connector.
