ECM/PCM Archives - Page 3 of 9 - Brake & Front End
Tech Tip: GMs, Hummers and Saabs May Experience Intermittent MIL with DTC P2138 and Reduced Power

Some customers may comment on an intermittent malfunction indicator lamp (MIL) being illuminated with a message or an indicator that displays Reduced Engine Power.

Tech Tip: Dodge Neon Sport Code P0340 Intermittently

Customer complains the vehicle bucks and misses intermittently while driving. Code P0340 is stored. This code may be caused by the camshaft position sensor.

Tech Tip: Honda Has MIL On with DTC P1457

The EVAP bypass solenoid valve can fail due to corrosion, caused by water getting inside. If the water contains road salt, the solenoid windings could corrode, causing the valve to fail. In a few rare instances, the corrosion could be severe enough to cause an internal short in the solenoid valve, which could damage the ECM/PCM. If this happens, both the bypass solenoid valve and the ECM/PCM would need to be replaced.

Diagnostic Dilemmas: 8 Simple Rules …

Many of the “Diagnostic Dilemmas” Gary Goms is called upon to solve aren’t really all that complicated – but were caused by basic oversights and incorrect assumptions on the part of the technician. This situation has largely been caused by a lack of training and, in some cases, poor training.

Diagnostic Solutions: The Relationship Between PCMs, Sensors and Actuators

Not that I recommend installing used PCMs, but I occasionally need a rebuildable core to replace a missing or badly damaged powertrain control module (PCM). But lately, I’ve noticed that it’s becoming increasingly difficult to find a used PCM for an older import at a local auto salvage yard. While it’s sheer speculation on my part, this apparent shortage of PCM cores might be caused by too many poorly trained technicians replacing PCMs to solve sensor-based problems. In most of these cases, the problem remains unsolved even as the original and fully functional PCM is casually tossed into the trash when the tech moves on to another job.

Tech Tip: Hyundai Has Check Engine Light On with Fuel System Lean Code

The check engine light is on with a post catalyst fuel system lean code P2096, an oxygen (O2) sensor stuck lean B1/S2 code P2270, and an O2 sensor no activity B1/S2 code P0140.

Tech Tip: Volkswagen MIL is On, with DTCs P0087/P1093 or P2293

The MIL is on, with DTC P0087 (Fuel Rail/System Pressure Too Low), P1093 (Fuel Trim 2, Bank 1 Malfunction) or P2293 (Fuel Pressure Regulator 2 Performance) stored in the ECM’s fault memory. This could be caused by excessive wear of the intake camshaft lobe that drives the high-pressure fuel pump. The wear limits maximum pump piston lift, causing fuel rail pressure fluctuations. The wear on the camshaft lobe can also lead to wear on the base of the high-pressure fuel pump cam follower.

Tech Tip: Nissan MIL On, DTC P0603 – ECM Power Supply

If you have a vehicle with the MIL on that has a DTC P0603 stored in the ECM, perform the diagnostic steps in this bulletin first.

Tech Tip: Tacoma’s MIL Is On with DTC P0705 Set

Some 2005-’09 model year Toyota Tacoma vehicles may exhibit an MIL On condition with DTC P0705 (Transmission Range Sensor Circuit Malfunction [PRNDL Input]) stored.

Tech Tip: Ford Traction Control Light On/No DTC, or DTC P1889

Some 2005-’07 Five Hundred, Freestyle and Montego vehicles equipped with all wheel drive (AWD) may exhibit the traction control warning lamp on.

Diagnostic Dilemmas: The Diagnostic Tail Gunner – Surviving in the Age of Information

One of the first survival skills my professor taught is called “preparatory set,” which is simply the act of preparing to do something. Each of us engages in preparatory set when we open our toolboxes each morning. The very act of opening our toolbox signals to our mind that we’re ready to go to work and deal with the day’s issues.

Tech Tip: Kia Has Intermittent MIL On with No Fault Code Stored

In affected vehicles, an intermittent short to ground in a circuit only intended for testing purposes may cause the MIL to illuminate and a DTC P1330 (Spark Timing Adjust) to be stored. As soon as the fault disappears, the MIL may turn off and the fault code can also be immediately erased by the engine management system, making it hard to diagnose the concern.