OBD-II Code P2A87 – Alternative Fuel Pump C Compression Stroke Valve Control Circuit/Open
As a mechanic, one of the most common challenges you face is diagnosing issues with a vehicle’s onboard diagnostics (OBD) system. OBD-II codes provide a way to troubleshoot and identify issues with a vehicle’s emissions control systems, among other things. One of the most commonly encountered OBD-II codes is P2A87 – Alternative Fuel Pump C Compression Stroke Valve Control Circuit/Open. In this article, we will explain what this code means and how to repair the issue.
What is OBD-II Code P2A87?
OBD-II Code P2A87 is a diagnostic trouble code (DTC) that is set when the powertrain control module (PCM) detects an issue with the alternative fuel pump circuit that controls the compression stroke valve. The alternative fuel pump circuit plays a crucial role in ensuring that the vehicle runs smoothly, and any problem related to it can lead to serious issues with engine performance.
The primary function of the alternative fuel pump is delivering fuel to the engine at high pressures to ensure proper combustion. The compression stroke valve, on the other hand, controls the pressure that is built up in the fuel injectors. If there is a problem with the valve, it can lead to increased fuel consumption and decreased fuel economy.
The P2A87 code is most commonly associated with hybrid or alternative fuel vehicles as they have alternative fuel pumps that are the primary fuel delivery system.
What causes OBD-II Code P2A87?
There are several reasons why this code might be set, including:
1. Open or short circuit within the alternative fuel pump c compression stroke valve control circuit. This can be due to various factors like wear and tear, loose connections, damaged wiring, or corrosion.
2. Faulty or damaged compression stroke valve. Various reasons can cause compression stroke valve damage, such as malfunctioning, dirt buildup, corrosion, and oil sludge buildup.
3. Malfunctioning Fuel Pump. A faulty fuel pump can cause a drop in pressure and a drop in fuel flow, which leads to P2A87 trouble code.
4. PCM Malfunction. If there is an issue with the PCM, it can cause incorrect readings about the alternative fuel pump circuit, leading to P2A87 code.
How to diagnose OBD-II Code P2A87?
When the P2A87 code is detected, a professional mechanic will use various diagnostic tools to identify the underlying cause of the issue. One of the first things to check out is the alternative fuel pump c compression stroke valve control circuit. The mechanic should visually inspect the wiring harness, connectors, and other components for any visible signs of damage, corrosion, or wear and tear.
The next step is to check the compression stroke valve using a diagnostic tool that can read live data. The mechanic should check the actual fuel pressure readings from the fuel pressure sensor during a cold start or when the engine is running. If the readings are erratic or irregular, it could indicate a faulty compression stroke valve.
The alternative fuel pump should also be checked with the fuel pressure gauge. If the gauge reading shows an irregular or low pressure, it might mean that the fuel pump is malfunctioning. The mechanic should also use the scan tool to check the PCM for any issues that might be causing the P2A87 code.
How to fix OBD-II Code P2A87?
After identifying the underlying cause of the P2A87 code, the mechanic should implement the following repairs:
1. Repair or replace any damaged wiring, connectors, or components in the alternative fuel pump c compression stroke valve control circuit.
2. Replace the compression stroke valve if found damaged or malfunctioning.
3. Replace the alternative fuel pump if it is faulty.
4. Replace the PCM if found to be the underlying cause of the issue.
5. Clear the code using an OBD-II scanner
Frequently asked questions
1. What does P2A87 trouble code mean?
P2A87 is a diagnostic trouble code that indicates an issue with the alternative fuel pump c compression stroke valve control circuit.
2. What causes P2A87 code?
The P2A87 code is caused by issues with the alternative fuel pump circuit, such as an open or short circuit, faulty compression stroke valve, malfunctioning fuel pump, or PCM malfunction.
3. How can I diagnose P2A87 code?
Diagnosis of the P2A87 code involves visual inspection of the components, live data check, scan tool check for PCM, and fuel pressure gauge check for fuel pump and compression stroke valve check.
4. How can I fix P2A87 code?
Fixing P2A87 code involves repairing and replacing damaged wiring and connectors, replacing the malfunctioning compression stroke valve or fuel pump, or replacing PCM upon malfunction detection.
5. Can I drive my vehicle with P2A87 code?
It is not recommended to drive your vehicle while P2A87 code is displayed because the engine’s performance will be compromised, decreasing fuel economy and increasing emissions in the vehicle’s environment.
Conclusion
The P2A87 code is a critical diagnostic code for hybrid or alternative fuel vehicles; this code might not affect fuel performance. However, it has a direct link to the fuel deliverability of the vehicle. An experienced mechanic should identify and repair the underlying issues to ensure safe and optimal vehicle efficiency. The importance of regularly scheduled vehicle maintenance is critical in identifying any issues before it becomes too severe and unplanned stress on the engine. Other related issues like loose connectors that might cause P2A87 and other engine troubles should be routinely checked.