Electrical Archives - Page 10 of 55 - UnderhoodService
Diagnosing Power Steering Loss on a 2008 Ford Escape

The vehicle in question is a 2008 Ford Escape with a 3.0-L engine. The customer complaints are as follows: The steering wheel will turn by itself; at times, usually when turning, the vehicle will lose all power steering assist; and occasionally, while turning, the vehicle’s steering seems shaky. The 2008 and newer Escape models use

Ford power steering
The Case of the Missing Starter

I was called last fall by a client who owns a heavy-duty diesel shop to diagnose a no-cranking condition on his father-in-law’s 2006 Chevrolet Tahoe. Because his work is mainly with heavy-duty trucks, my client knew he was lacking both in tooling and technical background when he didn’t hear the familiar click of a starter

Diagnostic Dilemmas
Remy Adds Delco Remy 38SI To Its High-Output Alternator Portfolio

Remy International has announced the launch of the Delco Remy 38SI, its latest high-output alternator. With this high-efficiency, mid-range amperage alternator, Remy offers customers a comprehensive portfolio of high-output products. With a number of innovative features, the 38SI is a unique product offering, according to Remy. Some of the features include: • Remote sense that

The Why, Where, When of TPMS Sensors

To understand any TPMS relearn procedure, you have to understand this: Sensors only transmit, they do not receive. No vehicle asks a sensor for information on how it is doing. I know you’re thinking a sensor does receive signals when the vehicle is in relearn mode and the technician holds a TPMS tool to the

Think Like Sherlock Holmes To Avoid The Wrong Diagnostic Conclusions

As a boy, I read most of the Sherlock Holmes mysteries. Sherlock Holmes was a genius-level detective who could break a case by analyzing seemingly insignificant clues like the ash from a cigar. In contrast, Inspector Lestrade, who was Holmes‘ competitor from Scotland Yard, would inevitably arrest the wrong person by jumping to a premature

Electrical Vehicle Diagnostics
Most Common Causes of Misfire Codes

A flashing check engine light and a P0301 to P0312 diagnostic trouble code (DTC) is a surefire indication that one or more cylinders are misfiring. Occasional misfires may pass unnoticed, but a steady misfire is hard to miss. The engine usually feels rough, lacks power and uses more gas than usual. Sometimes a misfire may

Spark Plug Worn Rings
Honda Electrical System Diagnostics

This month, we’ll be taking a look at the charging and starting system on the Honda line of vehicles. Hondas are always ­welcome at our shop, as they are good, reliable cars that fix well and for which there is good service information and parts availability. Honda charging systems won’t present many problems for the

Pattern Failures of MAF and MAP Sensors

Pattern failures are those failures that happen over and over again — and the same applies to how customers describe these failures. Customers might unknowingly give you the answer to their problem without needing to open the hood. In this article, we will look both at the failures of these sensors and the actual customer

MAP Sensor
Pulling Codes: Signal No Longer Detected, The Story of Code P0340

This article will document the infamous P0340 code — Camshaft Position Sensor Circuit Malfunction. This is a code that involves the CMP signal, and, in many situations, one may be tempted to replace the sensor right away. This article will attempt to provide a game plan of attack. It’s always wise to start with a

P034 code
Reflashing & Reprogramming Tools

In the first half of 2014, NHTSA has issued more than 15 recalls where the fix was to reflash a module on a vehicle. In the same time frame, more than 100 TSBs have also been issued where the solution is to reflash a module. These recalls and TSBs cover a wide variety of problems

Pulling Codes: An Advanced Misfire Story The Story of P0301

This article will document code P0301 — Misfire Activity on Cylinder No. 1 — a code many of you have run into, but sometimes we have case studies that are worthy of mention. Our subject vehicle is a 2007 Mercury Mountaineer. The vehicle has a P0301 stored in its memory. The lead tech working on this

Figure 1
Three AGM, Gel Cell Battery Myths

Have you noticed more batteries are moving into the trunks and under the seats of some vehicles? Chances are if the battery is not under the hood, it is an absorbent glass mat (AGM) or gel cell battery. AGM eliminates acid spilling in an accident because it is sealed. They can be installed at odd