owners manual Mitsubishi Eclipse

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1-54 ENGINE - Control System 5 volt supply Biasing N7lAU52AA Both bus circuits are biased (supplied voltage) to 4 approximately 2.5 volts. The Bus+ and Bus- circuits‘& are biased through a series circuit (see the illustration at left). The bus current travels from a 5 volt source 13kQ through a 13k ohm resistor to Bus-, then through resistor a 120 ohm termination resistor to Bus+, and then { to ground through a 13k ohm resistor. Bus bias isj the voltage required to operate the bus. If the system is functioning normally, the Bus- circuit voltage is slightly higher than the Bus+ circuit voltage. This is normal, and is caused by the 120 ohm termina- tion resistor. The operating bus bias range is approxi- mately 1.5 - 3.5 volts. At voltage above or below Termination this range, the bus has difficulty communicating cor- resistor rectly. Termination 13k&2 The termination resistors are provided both the inside resistor of PCM and the inside of TCM. 7757 For the bus circuit to be complete, at least one termina- AFUOOBG tion point must exist. The resistance in the bus circuit is due to the termina- tion resistors. It can be measured with an ohmmeter at the data linkconnector by attaching the two ohmme- ter leads to the two bus wires. The ohmmeter will read 100 to 140 ohms for one controller with termina- t d tion and 40 to 80 ohms for two controllers with termina- tion. The termination points are inside of a controller but outside the communication chip. Inputs and Outputs N71AK53AA Messages sent over the communication system can be considered both inputs and outputs. Output mes- sages from any one module are used as input mes- sages to the other modules on the communication system. Input messages are used by the modules to imple- ment specific features. This arrangement allows more than one module to use information from the same sensor. Another example of output messages are those sent to the scan tool for diagnostic purposes.

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