Hardware Limited Operation Strategy (HLOS)

This system of special circuitry provides minimal engine operation should the PCM [mainly the central processing unit (CPU) or FEEPROM] stop functioning correctly. All modes of self-test are not functional at this time. Electronic hardware is in control of the system while in HLOS.

HLOS Allowable Output Functions:

• spark output controlled directly by the CKP signal
• fixed fuel pulse width synchronized with the CKP signal
• fuel pump relay energized
• idle cruise control output signal functional

HLOS Disabled Outputs To Default State:

• EGR solenoids
• no torque converter clutch lock-up

PCM Location:

• Behind instrument panel (cowl), center to both driver and passenger sides