ECM / PCM Archives - Page 6 of 9 - TechShop Magazine
Tech Tips: FLASH Reprogramming – GM Crankshaft Variation Relearn Procedure

A Crankshaft Variation Relearn Procedure must be performed if on 1996 and newer GM vehicles if: the ECC was reprogrammed; the crankshaft position sensor has been replaced; or the ECC has been replaced.

Tech Feature: Taking it to the Streets

We have all seen in our industry that a “streetable” racing engine or a “raceable” street engine appeals to a broad spectrum of potential engine buyers because of its flexibility. Yet, everyday street driving is not the same thing as serious drag racing.

Tech Tip: Intermittent No-Start on Ford 5.4L V8 Truck Engine

When it won’t start, there is no communication with the Powertrain Control Module (PCM). The theft light is flashing rapidly with codes U1147 and U1262 in the Hybrid Electronic Cluster (HEC). Also, the odometer just shows dashes with the key on instead of the actual mileage.

Tech Tip: 2008-2009 Dodge Dakota Powertrain Control Module Removal and Installation

To prevent problems of DTCs and other items related to the VIN broadcast, it is recommended that you disconnect the ABS CAB (controller) temporarily when replacing the PCM.

Can do CAN: A Simple Look at a Complex System

Ever wonder how your cable TV comes into your home on that single coaxial cable? In simple terms… it’s like a CAN system. A good definition of a CAN system would be: High speed communication sent via data lines to and from components.

Tech Tip: Chevy Malibu Starts and Stalls

With some Chevrolet Malibus (1997-1999 2.4L, 1997-2003 3.1L and 2004 2.2L and 3.5L engines), the vehicle will start and then stall. A scan tool should indicate a DTC P1626, P1630 or P1631 stored in the Powertrain Control Module (PCM). The flow chart for each code will direct a scan tool to be used to access BCM codes. This is the best way to perform diagnostics on this problem.

Tech Tip: Audible Spark Knock, MIL On and DTC P0332 Set on GM Models

Some customers may comment on a mild to severe engine ping (commonly referred to as spark knock), usually worse during acceleration, and/or an illuminated MIL.

Tech Feature: Where Do You Start with Mercedes No-Start Diagnostics?

Hundreds of times a year, repair shops will get cars brought to them to repair a “No Start” fault. This article is going to discuss the process that it takes to make repairs when there are so many variables. Though this article will be focused on Mercedes-Benz, the steps can be used for any make or model.

Tech Tip: MIL On/DTC P2004 on Miata and MazdaSpeed Models

On some vehicles, after sitting overnight and being started, the MIL comes on and DTC P2004 sets into PCM memory. This occurs because vacuum (momentarily) does not flow into the Variable Tumble Control System (VTCS) shutter valve actuator.

Hyundai Tech Tip: No Spark, No Injector Pulse on 2002 Sonata 2.4 L Models

You may get a customer complaint that the vehicle died while in Drive, then wouldn’t start. There is no spark and no injector pulse, and no engine rpm on the scanner while cranking, and it’s setting a Crankshaft Position (CKP) sensor code P0335.

Engine Maintenance: OBD II Diagnostics, Misfire Codes, Fuel Trim Faults, Driveability and More

As automotive electronics diagnostics continues to evolve, so do the tools that are need to diagnose and repair today’s complex engine and electronics systems. This lineup will arm you will some diagnostic tips and give you some invaluable service advantages on Porsche, BMW, Hyundai and Mazda models.

Kia Tech Tip: DTC P0460 Update for Sephia Models

The original logic used for DTC P0460 (fuel level sensor circuit malfunction) in 2000 model year Sephias would illuminate the MIL and store a fault code for circuit-related problems (open or short), and for a fuel level input signal that failed to stay within the “plausibility” test limits stored in the ECM. “Plausibility” or “rationality” checks are frequently built into the ECM software to make sure that test results outside the normal range are detected as possible faults.