WebSince the catalyst heater is crucial for exhaust emission reduction, a code P0429 should be considered severe. Symptoms of this code may include: Decreased fuel efficiency. A … WebMar 21, 2024 · Fault Code: 4156 SPN: 5746 FMI: 4 Aftertreatment 1 Diesel Exhaust Fluid Dosing Unit Heater Relay Circuit - Voltage Below Normal or Shorted to Low Source 1 Aftertreatment diesel exhaust fluid line heater relay SUPPLY voltage check 2 Aftertreatment diesel exhaust fluid dosing unit heater relay is malfunctioning

DEF pump diagnostics Vehicle Service Pros

Jul 26, 2016 · Web4375 4 DEF Pump Circuit Failed Low ... 5488 4 SCR Line Heater #5 Circuit Failed Low . ... ACM2.1 FAULT CODE DESCRIPTION GHG14 5488 5 SCR Line Heater #5 Circuit Failed Open 520242 9 NOX Mass Signal Not Available via CAN 520323 3 High Side Digital Output Supply Voltage Circuit Failed High how to make a golf league schedule

DEF Line Heater Voltage Above Normal Or Shorted High - Hot …

WebJan 19, 2024 · The speed sensor operates at 4.6 to 4.8V, and this signal is pulled to ground by the pump. To indicate the speed to the computer, please refer to Figure 1 again. I have also taken this pump apart to determine how many field coils it has, and on this model year with the B6.7, the pump has 12 field coils and is a diaphragm-type pump. WebJan 5, 2024 · STEP 2B: Check for an open circuit on the aftertreatment DEF dosing unit signal. Less than 10 ohms? STEP 2C: Check for an open circuit on the aftertreatment DEF dosing unit supply. Less than 10 ohms? STEP 2D: Check for a pin-to-ground short circuit on the aftertreatment DEF dosing unit signal. Greater than 100k ohms? STEP 2E: Check … WebAug 26, 2016 · For this code, the easiest thing to do unplug the DEF Supply Line Heater connector. With the scan tool hooked up, see if code P20B9 DEF Supply Line Heater Circuit High Input is now active after 15 … how to make a golf green in your yard