Check Engine Light, Events and Troubleshooting

The Role of Scan Tool Graphing in Complex Auto Mechanic Diagnostics

Automotive Training Centre

JUNE 25, 2025

When today’s vehicles roll into the garage with a check engine light or a strange misfire, gone are the days of relying on guesswork. Graphing brings those events to light. Complex auto mechanic diagnostic problems now require high-level tools and skills, and one of the most valuable is scan tool graphing.

Mechanic

Mechanic Check Engine Light Auto Mechanic Training Automotive

Throttle-By-Wire Diagnostics

Tomorrow's Technician

NOVEMBER 29, 2023

During events like increased loads on the alternator caused by electric power steering, the throttle angle will keep the engine speed constant. The other advantage to throttle-by-wire is the ability to manage power from the engine during ABS, ESC and traction corrections. Codes P0120-P0124 are for sensor A.

Engineering

Engineering Check Engine Light Vehicle Troubleshooting

P0442: EVAP System Leak Detected (Small Leak)

RepairSmith

APRIL 25, 2024

An Illuminated Check Engine Light It’s almost impossible to physically detect an EVAP leak. So when the leak detection pump in the exhaust system suspects a small EVAP leak event, it immediately turns the Check Engine Light on.

Emissions Testing

Emissions Testing Check Engine Light Mechanic Engineering

Auto Repair Digest

The Role of Scan Tool Graphing in Complex Auto Mechanic Diagnostics

Throttle-By-Wire Diagnostics

P0442: EVAP System Leak Detected (Small Leak)

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