Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Powertrain Control Module (PCM) Hardware Limited Operation Strategy (HLOS)
This system of special circuitry provides minimal engine operation should the PCM, mainly the central processing unit (CPU) or electronically erasable programmable read only memory (EEPROM), stop functioning correctly. All modes of self-test are not functional at this time. The 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
PCM Location - The PCM is located behind the instrument panel (cowl), center to both driver and passenger sides (access from the engine compartment).
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.