Aftermarket July/August 2022 Issue

JULY/AUGUST 2022 AFTERMARKET 29 www.aftermarketonline.net Fig.2 Fig.4 Fig.5 Fig.6 Fig.7 harness was running down the back of the engine, above the driveshaft. Further inspection showed that the connector had been rubbing on the driveshaft and was intermittently shorting the 5V reference circuit to ground, causing the drop out in the 5V supply to all the related sensors. Please refer to Fig.6 and Fig.7. A wiring repair, replacement pipe and EGR valve were installed, and this vehicle was then cured. The original EGR valve had seized, causing the engine management light to illuminate, but a poor attempt at repair led to a shorted 5v reference circuit. Keeping your eyes open for anything that seems out of the ordinary, like a completely missing pipe for example, is a good indicator that software tampering has occurred. This is becoming more and more frequent, making the diagnosis a lot more difficult due to pieces of the puzzle being taken away. If you are ever in doubt whether software tampering has occurred, having access to dealer equipment is advantageous in these circumstances; allowing us the ability to flash the correct/original files onto the computers so we can then continue with the diagnosis. Fig.3