The Actron Cp9580a Scan Tool is a valuable tool for diagnosing car problems, but sometimes it can encounter compatibility issues. This article explores troubleshooting steps when using a CP9580A scan tool on a 1997 Ford Ranger experiencing lean codes (P0171 and P0174). We’ll discuss the observed issues, potential causes, and solutions for fixing both the scan tool problem and the lean condition.
CP9580A Inconsistent Readings
When using the CP9580A on a ’97 Ranger with P0171 and P0174 codes, the scan tool displayed unusual readings. Short Term (ST) and Long Term (LT) fuel trims were stuck at -100, and oxygen (O2) sensor readings were 0.00V and -100. The tool functioned correctly on a 2003 Ford Windstar and a 1997 Ford Explorer, reading all values as expected. Interestingly, it also worked flawlessly on another 1997 Ranger (3.0L engine) displaying live data for trims and O2 sensors. This suggests a potential compatibility problem between the CP9580A and the specific configuration of the 1997 Ranger (4.0L, 2WD, 5-speed). The scan tool did capture a snapshot of the P0174 fault with LT fuel trim values in the high teens, but still no O2 sensor data. Attempting to run the O2 monitor test resulted in a “This feature is not supported by this vehicle” message.
Addressing the Lean Condition (P0171 and P0174)
Beyond the scan tool issues, the underlying lean condition needs to be addressed. The Mass Air Flow (MAF) sensor readings appear normal (0.45V at 800 RPM and 1.50V at 2500 RPM). Checking for vacuum leaks revealed a potential issue with the PCV valve hose. While no cracks were visible, the hose detached easily.
Potential Solutions
For the CP9580A issue:
- Software Update: Check for firmware updates for the CP9580A. An updated version might resolve compatibility problems with the 1997 Ranger.
- Alternative Scan Tool: Consider using a different scan tool specifically designed for Ford vehicles or known to be compatible with 1997 models. Professional-grade scan tools often have broader vehicle coverage.
- Consult Actron Support: Contact Actron directly for technical assistance. They may have specific insights into this compatibility issue.
For the Lean Condition:
- PCV System: Replace the PCV valve, hose, and grommet. A faulty PCV system can introduce unmetered air, causing lean codes.
- Intake Manifold Gaskets: Inspect and replace intake manifold gaskets, particularly the lower intake gasket, as they are a common source of vacuum leaks in older Ford engines. Plenum gaskets can also leak, but are less common.
- Oxygen Sensors: Given the mileage (127,000 miles), replacing the oxygen sensors is a good preventative maintenance step. While they haven’t thrown a specific code, aging O2 sensors can contribute to inaccurate fuel mixture calculations.
Conclusion
Troubleshooting car problems requires a systematic approach. While the CP9580A scan tool encountered compatibility issues with the 1997 Ford Ranger, alternative solutions like software updates or different scan tools can provide the necessary data. Addressing the lean condition likely involves replacing the PCV system components and potentially the intake manifold gaskets. Replacing aging oxygen sensors is also recommended. Thoroughly investigating each potential cause will lead to a successful repair.
