Safety Mode:
- Safety Mode Valve
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When the first 1-2 shift occurs, the safety mode valve shifts from the released position to the applied position and remains there until the engine is switched OFF. If safety mode occurs - no TCM signal to the shift solenoid valve, the transmission will shift to safety - fifth gear. If the engine is then switched OFF and ON, still with no TCM signal, the safety mode valve will return to, and remain in, the released position. Line pressure fluid will pass through the safety mode valve into the line safety mode fluid circuit. Line safety mode fluid is routed to the 4-5 shift valve train.
- 4-5 Shift Valve and 4-5 Shift Control Valve
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Line safety mode fluid forces the 4-5 shift valve to downshift to the fourth gear position allowing - after the engine has been switched OFF, a fourth gear start - instead of fifth, in the event of safety mode.