KIT-SEAL 8S4680 - Caterpillar

System Operation Description:The Electronic Control Module (ECM) receives four input signals from the Engine Control Switch (ECS). The input signals allow the control to determine the mode of operation. The ECS can operate in four modes: OFF/RESET, MAN/START, COOLDOWN/STOP and AUTO.When the ECS is set to the OFF/RESET position, the start/run/stop input to the ECM and the auto input to the ECM are open. The ECM is not powered. Engine operation will stop when the ECS is switched to this position.When the ECS is set to the AUTO position, the start/run/stop input to the ECM is open and the auto input to the ECM is low. The ECM is powered. If the remote start/run/stop switch is closed, the engine start sequence will begin.When the ECS is set to the MAN/START position, the start/run/stop input to the ECM is low and the ECS in auto input to the ECM is open. The ECM will begin the engine start sequence.When the ECS is set to the COOLDOWN/STOP position, the start/run/stop input to the ECM is open and the ECS in auto input is open. After the engine cooldown, the ECM will shut down the engine.If the signals from the start/run/stop input to the ECM are in opposite states, the ECM determines that one of the signals is faulty. The ECM ignores the signals until power is cycled to the ECM. If this occurs, the engine must be cranked manually. Use the "Manual Crank Switch" which is located inside the electronic instrument panel. When the engine is shutdown, the ECS must be placed in the OFF/RESET position. This will disconnect power to the ECM. A CID-FMI will be active until the ECM is powered down. The status for the ignition switch will display "ABNORMAL DATA" until power to the ECM is cycled. If the engine is running and the signals from the start/run/stop input to the ECM change to opposite states, the engine will continue to run. The ECM generates a diagnostic code that will remain active until power to the ECM is cycled. When the engine is shutdown, the ECS must be placed in the OFF/RESET position. This will disconnect power to the ECM.If you close the remote start/stop switch, and the ECS is in the AUTO position, the engine will start. The status for the switch will display "ON" or "OFF". This status of the remote start/stop switch is available on the Caterpillar Electronic Technician (ET) when the ECS is in the AUTO position.
Illustration 1 g01021043
Typical exampleTest Step 1. Check for Connector Damage.
Turn the keyswitch to the OFF position.
Thoroughly inspect the ECM connector J1/P1 and