ENGINE STOP AND DERATING SYSTEM OPERATION IN ENGINE STOP The engine stop is achieved by the "open" or "closed" operation of the fuel shutoff valve controlled by ECM (Electronic Control Module). OPERATION IN ENGINE DERATING For the purpose of reducing the input torque during the clutch slip when a shuttle shift is done, engine derating is to be used. When the shuttle shift is occurring, the contacts points "30" and "87" of the engine derating relay (7) are closed due to the signal of the transmission controller (10). Then the control signal flows from the No.23 terminal of ECM (8) to the No.9 and 10 terminals.
In accordance with this, the engine RPM will be dropped down for maximum 0.7 seconds. (The operating time is set automatically in dependent of vehicle speed.) S0802195K Page 12 Electrical System