Auto Diagnostics and Codes

More Diagnostics

Understanding Engine Misfire Codes

When the fuel/air mixture ignites, many factors must be met to pass a misfire monitor.

Forcing OBD II Vehicle Emission Monitors

Some vehicles have readiness issues when it comes to setting all the OBD II monitors.

Auxiliary Water Pump Diagnostics

A car or truck comes into your shop with a complaint of poor heater performance- the issue may be the auxiliary water pump.

Ignition Coil Output

To see inductance inside the primary windings, use an amp probe placed around the positive wire for the ignition coil.

Rough Running GM Vehicle

This condition may be caused by an internal circuit board fault within the throttle body.

Using a Scope

Ignition coil and plug diagnostics.

Scope-diagnostics
Diagnostic Procedures For Stop/Start Systems

Stop/start technology is more than just a switch wired to the brake pedal and starter.

Auxiliary Cooling Pumps

An auxiliary cooling pump’s primary function is to circulate warm coolant to the heater core.

Battery Management Means Knowing How It Ages

The battery may be fully charged, but you also need to measure how low the voltages go while the engine is cranking.

Detecting Misfire And Knock Conditions

Knock sensors are mounted on the block near the base of the cylinder head.

Mercedes Ignition Coil Pack Diagnostics

Replacing a single coil might not be the best approach to curing an engine of a chronic misfire.

Chrysler’s Totally Integrated Power Module

The TIPM is on the CAN bus, any issues with the communication between the ECM, ABS and BCM can cause problems with the TIPM.