Search results

P2471 exh gas temp circuit high (4th from upstream). I monitored the DPR outlet temperature sensor from the BCU. (The ECM only showed one exhuast gas temperature, but it was for the EGR). In the BCU, The other DPR temperature sensors showed numbers that made sense, but the DPR outlet reads...

2014 Hino 338 with PTO and remote throttle switch installed (non-OEM). PTO turns keeps turning off. I monitored the PTO switch and remote throttle switch (scanner sees them as PTO switch 1 and PTO switch 2) and both switches show as "ON" when the problem occurs. So, there's no problem with the...

2014 Hino 338 with PTO and remote throttle switch installed (non-OEM). PTO turns keeps turning off. I monitored the PTO switch and remote throttle switch (scanner sees them as PTO switch 1 and PTO switch 2) and both switches show as "ON" when the problem occurs. So, there's no problem with...

I'm feeling generous since Hino 123 helped me resolve a problem. So, I'd like to pay it forward with a little tip. Did you know there's a little strainer inside a banjo bolt on the injection pump? One more place where fuel can be restricted. Customer's Hino crank, no start. Fuel rail...

No check engine light. No faults in any modules. After coming to a stop, engine is weak accelerating. Problem is random, but have become frequent enough that it happens about 50% of the time. When the lack of power occurs, it will randomly and suddenly go back to normal while trying to...

2014 Hino 338. I monitored the atomizer pressure and when it kicks on, it went as high as 103 PSI. Is this normal? I think I usually see around 90 PSI.

2014 Hino 338. What does this mean and how should I diagnose it? (I'm also getting P1405 in the BCU, high atomizer fuel pressure. Are they related?)

How do I do an injection quantity test? So, I understand you command the RPM to 1500. What am I looking for when I monitor the injectors? Am I also commanding the injectors to do something, like adjust fuel quantity?

I know the burner uses a CAV (combustion air valve) to turn air on and off to enter the burner. Where does that air come from? I thought it came from the air tank (for air brakes). But I read in another post that it comes from the turbo. Does the air get injected through the atomizer nozzle...

I'm watching "DEF pump pressure". Once the "SCR Fore Exhaust Gas Temperature" gets above 300 deg F, "DEF Dosing Device Control Mode" changes to "Urea Dosing Enabled State" and the pump kicks on. Pressure goes to around 130 PSI (I was told 120-140 PSI is normal). At this time, "Pump Opening"...

2013 Hino 338 I'm trying to get good at diagnosing bad NOx sensors. Sometimes it's obvious, like it's completely dead. But often, one may be giving a bad reading. 1) Monitoring "NOx sensor request state". Under what conditions does the NOx sensor request state change from "Not requested" to...

2013 Hino 338. DCU shows P206A malfunction in urea quality sensor. Also has P2045 urea tank temperature sensor 2 (hi). I know I need to replace the tank temperature sensor, but there's no such thing as a urea quality sensor on these trucks is there? Is it just making a guess based on some bad...