Today, I investigated a few potential issues with my Honda Pioneer, focusing on a high idle problem and addressing recent recall notices. Here’s a breakdown of the steps I took to diagnose the situation.
Addressing Honda Pioneer Recalls
First, I checked for any outstanding recalls on my Honda Pioneer using my VIN. I discovered two current recalls: one concerning the steering shaft and another related to the throttle pedal potentially sticking in the open position. It’s important to address these safety recalls promptly, so scheduling a service appointment with the dealer is definitely on my to-do list.
Despite the throttle pedal recall, I manually inspected the pedal joints and linkages. Everything appears to be moving freely and returning to the resting position as expected. There’s no immediate sign of the throttle sticking. I also verified the throttle cable, confirming it fully releases and allows the throttle body to close completely.
One component I haven’t yet fully investigated is the throttle release angle sensor, located on the pedal assembly. Accessing this sensor seems to require removing the entire gas pedal assembly, making it a task for another day. Information on the specific function of this sensor seems limited, so further research might be needed.
Investigating Injectors and Wiring
Next, I turned my attention to the fuel injectors and their wiring. I conducted a thorough check of the injector system and wiring, and everything appears to be in good working order. This eliminates the injectors and their electrical connections as likely causes of the high idle issue.
Examining the IACV Valve
Moving on to the Idle Air Control Valve (IACV), I removed and reinstalled it, taking a tip to ensure correct seating by running the valve all the way down during reinstallation. Unfortunately, this didn’t resolve the high idle problem when the engine is warm. However, this method is a useful way to rule out seating issues with the IACV.
While the IACV was removed, I performed another test and observed an interesting behavior. When the engine is cold and the key is turned on, the IACV barrel moves vertically on the spindle until it reaches the top. However, when the engine is warm, the barrel moves up and then drops back down approximately 3/8”. This could be normal operation for a warm engine, but it’s worth noting as a potential clue.
Considering the ECM
After these checks, I contacted the dealership to inquire about the Engine Control Module (ECM). They confirmed that the ECM for my Honda Pioneer is a plug-and-play unit. This means replacement should be straightforward – simply remove the old ECM and install the new one, without needing any dealer programming or calibration. Based on this information, I’ve ordered a new ECM, and it should arrive next week. I will provide an update on whether replacing the ECM resolves the high idle issue once the new unit is installed.
Thank you again for the helpful suggestions and information!
