Magazine Archives - UnderhoodService
Chassis Control Modules After Reconnecting Battery

To resolve the issue, fully disconnect the negative lead from the battery terminal.

Understanding Coolants

All-season coolant used inorganic acid technology and worked great for almost 30 years.

Differentials And Diagnostics

A differential allows the two connected wheels to spin at different rates.

Honda Electronic Throttle Body Service Tips

Using care and following OEM procedures will help you to avoid unnecessary parts replacement and comebacks.

Determining Catalytic Converter Efficiency

Almost every part on the engine determines how long a catalytic converter will last.

New Oil Specifications

Many 0W16 oils have a new donut certification mark on the bottle called API SN-PLUS and SN-PLUS Resource Conserving.

Solving Intermittent Overheating

New cooling systems anticipate and influence changes in coolant temperature.

Alternator Testing For No Charge Conditions

Many alternator problems turn out to be nothing more than a bad connection at the alternator or a bad wiring harness.

Engineering Better Belt Systems

You might not be able to see it, but an accessory drive belt is always both speeding up and slowing down.

Do You Know The Cause Of A No-Spark Condition?

A no-spark condition could be the result of communication errors or missing data from a dead module.

Domestic Gasoline Engine Oil Specifications

If it’s been more than a year since last oil change, the IOLM will display a reminder message, regardless of mileage.

Starters & Alternators – Tips For Diagnostics

Here are 4 tips to follow when replacing starters and alternators.