Hardware Limited Operation Strategy

HLOS is a system of alternate circuitry that provides minimal engine operation if the PCM or EEPROM fails. During HLOS, all self-test function will stop and system will be controlled by electronic hardware.

HLOS Allowable Output Functions:

• Spark Output Controlled Directly By CKP Signal
• Fixed Fuel Pulse Width Synchronized With CKP Signal
• Fuel Pump Relay Energized
• Idle Speed Control Output Signal Functional

HLOS Disabled Outputs To Default State:

• EGR Solenoids
• No Torque Converter Clutch Lock-Up