B2300 SE Regular Cab 2WD L4-2.3L VIN A (1997)
Engine Control Module: Description and Operation
Hardware Limited Operation Strategy
HLOS - HARDWARE LIMITED OPERATION STRATEGY
HLOS is a PCM function. HLOS provides minimal engine operation should the PCM stop functioning correctly. All modes of self-test are not
functional and electronic hardware is in control of system.
HLOS allowable output functions:
-
Spark output controlled directly by PIP signal.
-
Fixed fuel pulse width synchronized with PIP signal.
-
Fuel pump energized.
-
Idle speed control output signal functional.
HLOS disabled outputs to default state:
-
EGR solenoids
-
No converter lock-up.
