AfterMarketNews AfterMarketNews Auto Care Pro AutoCareCareerHub Brake&Frontend BodyShopBusiness Counterman EngineBuilder Fleet Equipment ImportCar Motorcycle & Powersports News Servicio Automotriz Shop Owner Tire Review Tech Shop Tomorrow's Tech Underhood Service Speedville

No More Free Tire ­Rotations!

Tire rotation is a cornerstone of vehicle preventive maintenance and tire longevity. It is a well-proven fact that tire tread life can be greatly enhanced by regular and timely tire rotation. During rotation, each tire and wheel is ­removed from...

Read more...

ASE G1: How To Measure Cold Cranking Amps, Reserve Capacity

The ASE G1 test contains 55 scored, job-related questions, 15% of which will concern electrical maintenance and repairs. From the ASE G1 study guide, you will need to know how to: • Perform battery tests (load and capacitance); ­determine needed...

Read more...

ASE A5: Brake Fluid And Bleeding Sequence

The ASE A5 Test includes a portion on brake fluid, bleeding, flushing and leak testing. You must know how to: • Diagnose poor stopping, pulling, dragging, or incorrect pedal travel caused by problems in the brake fluid; determine needed repairs. •...

Read more...

Modern Charging Systems: Cover All The Bases During the Diagnostic Process

To quote a familiar situation: “My customer’s car is now on its third alternator in six months and my jobber store refuses to ­warranty a fourth.” In other words, the parts supplier believes that an underlying problem is causing these alternators...

Read more...

Audi Fuel System: MIL On/Multiple Low Fuel Pressure DTCs

Due to fuel intrusion into the low-pressure ­system fuel pressure sensor (G410), a false signal may be sent to the controller, resulting in a reading that is out of tolerance. Model: 2007 Audi A4 Sedan V6-3.2L Scenario: The MIL is on and one or...

Read more...

Toyota: Check Engine Light Leads To New Battery Temperature Sensor

Complaint: The customer states the check engine light is on. Cause: A scan tool finds code P0517 – Battery Temperature Sensor Circuit High. A road test, while using the scan tool to ­monitor live data, finds the battery temperature sensor signal...

Read more...

Toyota Avalon Alignment Spec: 2005-‘11

The Toyota Avalon is sometimes called the “Japanese Buick” due to its size and plush ride. However, the Avalon’s overall suspension design does not vary that much from Toyota’s smaller vehicle platforms. The Avalon comes in four trims:...

Read more...

BYOBP Brake Jobs: This Has To Stop

Recently, I was sent a link to a TV commercial on YouTube for a mobile brake business. I will post the link on BrakeandFrontEnd.com. The commercial featured a puppet claiming that the business could save a driver $500 on brakes because shops mark up brake...

Read more...

Brake NVH: Real World Applications

First know that all brakes make noise. When the friction material makes contact with the rotor, the coupling causes the brake pad and rotor to oscillate and vibrate. The components are locked as a combined system that will ­vibrate at the combined...

Read more...

Top 5 Tools: John Forro, AST, Automotive Service Technology in Hinckley, OH

John Forro AST, Automotive Service Technology Hinckley, OH ALLDATA Information System: I use this system daily for researching labor pricing, wiring schematics, circuit descriptions, torque specs, etc. One doesn’t need to memorize all the information...

Read more...

Phoenix Systems And NAPA Announce New Retail Agreement

Phoenix Systems has announced an agreement with NAPA/Balkamp to put Phoenix Systems products in their stores. As part of this agreement, NAPA locations will now have access to BrakeStrip Brake Fluid Test Strips and the New NAPA Service Tool 2104-B Reverse...

Read more...

MAHLE Service Solutions Unveils New Website

MAHLE Aftermarket, Service Solutions, formerly MAHLE RTI, has introduced its new website at www.servicesolutions.mahle.com. The site contains updated information on MAHLE Aftermarket’s newest division, providing visitors with a clean, user-friendly...

Read more...

Home Electrical Diagnostic Dilemmas: Approaching No-Code Diagnostics

Print Print Email Email

1997 toyota camryThanks to the increasing reliability of modern vehicles, most diagnostic technicians are seeing fewer pattern-failure driveability complaints.

For that reason, many techs won’t gamble expensive shop time chasing an illusive no-code driveability complaint.

Instead, many will write “no problem found” on the repair order and move on to the next vehicle.

Unfortunately, at some point in time, the intermittent, no-code driveability will either be solved or the vehicle will be traded or sold for scrap. This month’s Diagnostic Dilemma will discuss in detail how I approached the no-code, intermittent driveability complaint on three
different vehicles.

The Stalling Camry
Last summer, I encountered a customer with a no-code, intermittent stalling complaint on a 1997 Toyota Camry. According to the customer, the stall most often occurred during engine warm-up or would manifest itself as an occasional hesitation at road speeds. photo 1: the ect (green connector) appeared to be a frequent culprit in many stalling complaints.

Although well-maintained, this vehicle had rolled up in excess of 200,000 miles. At this point, the crankshaft position (CKP) sensor had been replaced with no result.

While I don’t believe in searching for silver bullets, I do believe in doing preliminary research by consulting a professional database for technical and anecdotal case-study information.

It didn’t take but a few minutes online to determine that a faulty engine coolant temperature sensor (ECT) was causing many Camry stalling complaints.

The simplest procedure might have been to replace the relatively inexpensive ECT and let the customer drive the vehicle to verify the repair.

”photo

The following two tabs change content below.

Gary Goms

Gary Goms is a former educator and shop owner who remains active in the aftermarket service industry. Gary is an ASE-certified Master Automobile Technician (CMAT) and has earned the L1 advanced engine performance certification. He also belongs to the Automotive Service Association (ASA) and the Society of Automotive Engineers (SAE).
Latest articles from our other sites:

Browse CARDONE's Fall Parts Guide

CARDONE says that the company's new fall parts guide highlights new products like the new CARDONE Ultra premium line of calipers and other hard-to-find parts. The guide also features links to several new...More

ASA/AASA Safety Inspection Forum Reveals Widespread Support For Vehicle Inspection Programs

On Friday, Nov. 14, the Automotive Service Association (ASA) and the Automotive Aftermarket Suppliers Association (AASA) hosted a Vehicle Safety Inspection and Maintenance Forum in East Norriton, Pa. Forum...More

Modern Charging Systems: Cover All The Bases During the Diagnostic Process

To quote a familiar situation: “My customer’s car is now on its third alternator in six months and my jobber store refuses to ­warranty a fourth.” In other words, the parts supplier believes...More

Audi Fuel System: MIL On/Multiple Low Fuel Pressure DTCs

Due to fuel intrusion into the low-pressure ­system fuel pressure sensor (G410), a false signal may be sent to the controller, resulting in a reading that is out of tolerance. Model: 2007 Audi A4 Sedan...More

Toyota Avalon Alignment Spec: 2005-‘11

The Toyota Avalon is sometimes called the “Japanese Buick” due to its size and plush ride. However, the Avalon’s overall suspension design does not vary that much from Toyota’s smaller vehicle...More

BYOBP Brake Jobs: This Has To Stop

Recently, I was sent a link to a TV commercial on YouTube for a mobile brake business. I will post the link on BrakeandFrontEnd.com. The commercial featured a puppet claiming that the business could save...More

MOTOSHOP Technology Tools Adds Subaru To MotoLOGIC Repair & Diagnostics

MOTOSHOP Technology Tools announced the addition of Subaru info to MotoLOGIC Repair & Diagnostics, a Web-based tool for automotive technicians. The addition of OE repair and diagnostics information...More

OptiCat LLC Announces 'OnLine Parts Research Catalog'

OptiCat has announced the launch of its new OptiCat OnLine parts research catalog, located at www.opticatonline.com. OptiCat OnLine allows suppliers, WDs, professional repair shops and consumers a high-quality...More