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.
Scan Tool Data Definitions
Change Engine Oil Lamp: The scan tool displays On/Off. The state of the CHANGE OIL SOON indicator in the DIC as commanded by the PCM.
ECT Sensor: The scan tool displays -40-151°C (-40-304°F). The PCM monitors the voltage at the signal circuit of the engine coolant temperature sensor. The voltage is inversely proportional to the engine coolant temperature.
Engine Hot Lamp Command: The scan tool displays On/Off. The state of the TEMP indicator as commanded by the PCM.
Engine Oil Level Switch: The scan tool displays OK/Low. The PCM monitors the signal circuit of the engine oil level switch, where an open switch is displayed as Low.
Engine Oil Life Remaining: The scan tool displays 0-100%. The PCM calculates the remaining engine oil life.
Engine Speed: The scan tool displays 0-9999 RPM. Engine speed is computed by the PCM from the 3X reference input. It should remain close to desired idle under various engine loads with the engine idling.
Fuel Tank Level Remaining: The scan tool displays 0-100%. The PCM calculates the amount of fuel remaining in the tank based on the input from the fuel level sensor.
Generator Lamp Command: The scan tool displays On/Off. The state of the charge indicator as commanded by the PCM.
Ignition 1 Signal: The scan tool displays 0-25.5 volts. The PCM displays the voltage at the ignition 1 input.
Low Oil Lamp Command: The scan tool displays On/Off. The state of the Low Oil Level indicator as commanded by the PCM.
MIL Command: The scan tool displays On/Off. The state of the MIL indicator as commanded by the PCM.
Vehicle Speed Sensor: The scan tool displays 0-255 km/h (0-155 mph). The PCM monitors the voltage at the signal circuit of the vehicle speed sensor. The voltage is proportional to the vehicle speed.
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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.