Experiencing a no-start issue with your 2020 Honda Pioneer 700 after routine maintenance can be frustrating. This guide addresses a common scenario where a spark during battery installation potentially leads to starting problems. We’ll explore the troubleshooting steps taken and suggest possible causes and solutions for your Honda Pioneer 700 (SXS700M2 A).
Recently, a 2020 Honda Pioneer 700 owner performed preventative maintenance, including air filter, injector, fuel pump assembly, spark plugs, and oil change. Prior to this, the vehicle ran without issues. However, during battery installation, an accidental spark occurred when the positive wire contacted the battery while the ignition was on. This incident is suspected to have caused an electrical overload. Crucially, it’s noted that a green connector was missed during reconnection before the battery installation, although ground connectors were properly attached.
To diagnose the no-start condition, several components were checked and replaced. All fuses and relays were replaced, despite appearing functional initially. New spark plugs, matching the manual’s specifications, were installed. The fuel pump is confirmed to be working, and the fuel injector is spraying fuel correctly. The throttle body was also adjusted to factory settings and cleaned. Despite these efforts, the 2020 Honda Pioneer 700 still fails to start, although the dashboard illuminates when the ignition is turned on.
Valve adjustments were performed to the manual’s specifications, ruling out valve issues unless there’s a camshaft problem. Spark is confirmed at the spark plugs. A test involving pouring a small amount of fuel directly into the cylinders resulted in the engine firing briefly, suggesting a potential issue with fuel delivery or electrical current to the injectors, despite the injector test.
Given the electrical spark incident and the troubleshooting steps, the primary suspects are the wiring harness and the PGM-FI unit (ECU). The electrical overload could have damaged the wiring harness, causing a short circuit, or potentially damaged the ECU itself. Without specialized circuit testing tools or a mechanic’s computer, pinpointing the exact fault is challenging.
To proceed, consider a thorough inspection of the wiring harness for any visible damage or burnt wires, especially around the battery and ECU areas. If possible, using a circuit tester to check for continuity and shorts in the wiring harness would be beneficial. If these DIY steps don’t resolve the issue, seeking assistance from a qualified mechanic with diagnostic tools is recommended to further investigate the ECU and wiring harness of your 2020 Honda Pioneer 700.
