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4LHD/4LHDX Application Manual
Powertrain Control Solutions
REV 1.1
2.5.2 Vehicle Electrical Interface and Diagnostics
TCM Connector(s)
TCMs will have one or more connectors depending upon:
1. Number of wires necessary for vehicle installation
2. Customer requirements for wiring harness design
3. TCM enclosure sealing
4. Wiring harness orientation
TCM Power Supply and Fusing
The TCM shall have an exclusive connection to vehicle battery power and switched ignition power.
The TCM shall not share electrical fusing with any other vehicle system.
The TCM typically assumes centralized load dump protection.
Vehicle/Service Tool Serial Data Interface
The TCM is accessed via a serial data interface and a laptop.
The Serial Data interface device is provided by PCS with each TCM.
Two typical vehicle service tool interfaces are:
• 2 X CAN 2.0b
• 1x RS-232, 1 x J1850
All PCS TCMs are based on the PCS proprietary real-time operating system which contains the functionality to control
nearly any automatic transmission with PCS controls and includes diagnostics.
The customer shall be responsible for service tool system testing and certication.
Diagnostic System Interface
When using TCMs, coordination of powertrain diagnostic system reporting becomes very important. PCS will work with
the customer to ensure the TCM meets applicable specications.
PCS shall be responsible for TCM unit testing to applicable diagnostic system specications. The customer shall be
responsible for vehicle-level certication.
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