Decoding ’97 Probe OBD2 Codes: Your Comprehensive Guide

Navigating car troubles can be frustrating, especially when that check engine light illuminates on your dashboard. For owners of a ’97 Probe, understanding OBD2 (On-Board Diagnostics II) codes is the first crucial step towards diagnosing and resolving potential issues. This guide provides a detailed breakdown of OBD2 codes relevant to your ’97 Probe, helping you understand what these codes mean and how to approach troubleshooting.

OBD2 systems became standard in vehicles in the mid-1990s, including the ’97 Probe. This system is designed to monitor various aspects of your vehicle’s performance and emissions. When a problem is detected, the system generates a Diagnostic Trouble Code (DTC), often referred to as an OBD2 code. These codes are invaluable for pinpointing the source of a problem, saving time and potentially costly repairs.

This article focuses on a range of P-codes (Powertrain codes) that your ’97 Probe might display. These codes cover engine and transmission related issues. While this list isn’t exhaustive, it represents a significant portion of potential problems you might encounter. Remember, while this guide can help you understand the codes, professional diagnosis is always recommended for accurate repair and to ensure the longevity of your vehicle.

Let’s delve into the specifics of these OBD2 codes:

Understanding Common OBD2 Codes for Your ’97 Probe

The following is a list of OBD2 P-codes that may be relevant to your ’97 Probe. Each code description provides a starting point for understanding the potential issue.

• P1479 Fan Control (Condenser Primary) Circuit: This code indicates a problem within the fan control circuit, specifically related to the condenser primary fan. This could involve wiring issues, a faulty fan motor, or a malfunctioning control module. Overheating could be a symptom if this system is not functioning correctly.
• P1485 EGR Vacuum Solenoid Circuit: This points to an electrical fault in the Exhaust Gas Recirculation (EGR) vacuum solenoid circuit. The EGR system is crucial for reducing emissions, and a problem here might affect your vehicle’s emissions performance and potentially engine performance.
• P1486 EGR Vent Solenoid Circuit: Similar to P1485, this code indicates a fault in the EGR vent solenoid circuit. This solenoid is also part of the EGR system and its malfunction can lead to similar issues as P1485.
• P1487 EGR-CHK (Boost) Solenoid Circuit: This code refers to a problem within the EGR-CHK solenoid circuit, sometimes related to boost pressure control. This could be more relevant for turbocharged or supercharged vehicles, though the principle applies to EGR system monitoring.
• P1496 EGR Valve Motor Coil ‘1’ Open or Shorted: This code, and the following P1497, P1498, P1499, indicate issues with the EGR valve motor coils. Specifically, P1496 is for coil ‘1’ and suggests an open or short circuit within that coil. This directly impacts the EGR valve’s ability to function.
• P1497 EGR Valve Motor Coil ‘2’ Open or Shorted: This code, related to EGR valve motor coil ‘2’, similarly points to an open or short circuit in that specific coil, affecting EGR valve operation.
• P1498 EGR Valve Motor Coil ‘3 Open or Shorted: Continuing with the EGR valve motor coils, P1498 indicates an issue (open or short circuit) with coil ‘3’.
• P1499 EGR Valve Motor Coil ‘4’ Open or Shorted: Finally, P1499 signals a problem (open or short circuit) with EGR valve motor coil ‘4’. Issues with any of these EGR valve motor coils can disrupt the EGR system’s effectiveness.
• P1500 Vehicle Speed Sensor Intermittent Signal: This code suggests an intermittent signal from the Vehicle Speed Sensor (VSS). The VSS is crucial for various vehicle systems, including speedometer function, transmission control, and cruise control. Intermittent signals can lead to erratic behavior in these systems.
• P1501 Vehicle Speed Sensor Out of Self Test Range: This code indicates that the VSS signal is outside of the expected range during a self-test. This suggests a more significant issue with the VSS or its circuit than just an intermittent signal.
• P1502 Vehicle Speed Sensor Circuit Error: A general error within the VSS circuit is indicated by P1502. This could encompass wiring problems, sensor malfunction, or issues with the vehicle’s computer receiving the signal.
• P1504 Idle Air Control Solenoid Circuit Intermittent: This code points to an intermittent fault in the Idle Air Control (IAC) solenoid circuit. The IAC valve controls engine idle speed, and intermittent issues can cause unstable idling or stalling.
• P1505 Idle Air Control System at Adaptive Clip: This indicates that the IAC system has reached its adaptive limit. This often means the system is trying to compensate for another underlying issue, such as vacuum leaks or carbon buildup, that is affecting idle speed.
• P1506 Idle Air Control System Overspeed Detected: P1506 signifies that the engine idle speed is higher than expected, and the IAC system has detected an overspeed condition. This could be due to a sticky IAC valve, vacuum leaks, or other factors causing excessive air intake at idle.
• P1507 Idle Air Control System Underspeed Detected: Conversely, P1507 indicates that the engine idle speed is lower than expected, and the IAC system has detected an underspeed condition. This could be caused by a malfunctioning IAC valve, or issues restricting air intake at idle.
• P1508 Bypass Air Solenoid ‘1’ Circuit: This code points to a problem in the bypass air solenoid ‘1’ circuit. Bypass air solenoids are often used in emission control or intake air management systems.
• P1509 Bypass Air Solenoid ‘2 Circuit: Similar to P1508, this code indicates a fault in the bypass air solenoid ‘2’ circuit.
• P1512 VTCS Fault: VTCS stands for Variable Tumble Control System. P1512 indicates a fault within this system. VTCS is designed to improve combustion efficiency, particularly at lower engine speeds.
• P1521 VRIS Solenoid ‘1’ Circuit: VRIS is Variable Resonance Induction System. P1521 indicates a fault in the VRIS solenoid ‘1’ circuit. VRIS optimizes intake airflow for different engine speeds to improve performance.
• P1522 VRIS Solenoid ‘2 Circuit: Similar to P1521, P1522 points to a fault in the VRIS solenoid ‘2’ circuit.
• P1523 VICS Solenoid Circuit: VICS stands for Variable Intake Control System. P1523 indicates a fault in the VICS solenoid circuit, another system designed to optimize engine performance by controlling intake airflow.
• P1524 Charge Air Cooler Bypass Solenoid Circuit: This code is relevant for turbocharged or supercharged vehicles and indicates a problem in the charge air cooler bypass solenoid circuit. The charge air cooler reduces the temperature of intake air, and the bypass solenoid may control airflow around it.
• P1525 ABV Vacuum Solenoid Circuit: ABV stands for Air Bypass Valve. P1525 indicates a fault in the ABV vacuum solenoid circuit. ABV systems are often used in turbo or supercharged applications to manage boost pressure.
• P1526 ABV Vent Solenoid Circuit: Similar to P1525, this code points to a fault in the ABV vent solenoid circuit.
• P1529 L/C Atmospheric Balance Air Control Valve Circuit: L/C may refer to Lean Cruise. This code indicates an issue in the circuit for an atmospheric balance air control valve, possibly related to lean cruise control strategies for fuel efficiency.
• P1540 ABV System Fault: A more general fault within the ABV system is indicated by P1540. This could encompass various issues within the system beyond just the solenoid circuits.
• P1562 Powertrain Control Module +BB Voltage Low: This code indicates that the voltage supply (+BB) to the Powertrain Control Module (PCM) is low. This is a critical issue as the PCM needs stable power to function correctly. Low voltage can cause a wide range of problems.
• P1569 VTCS Circuit Low Input: This code related to the VTCS circuit, specifically indicates a low input signal, suggesting a problem with wiring, sensor, or the VTCS component itself.
• P1570 VTCS Circuit High Input: Conversely, P1570 for the VTCS circuit indicates a high input signal, also suggesting a circuit or component issue.
• P1601 Powertrain Control Module Communication Line to TCM Error: This code, and the following P1602, indicate communication errors between the PCM and the Transmission Control Module (TCM). P1601 is a general communication line error.
• P1602 Powertrain Control Module Communication Line to TCM Error: P1602 is another code indicating PCM-TCM communication errors. These errors can affect transmission performance and diagnostics.
• P1602 Immobilizer System Communication Error with Powertrain Control Module: (Note: repeated code number, but different description) This P1602 specifically indicates a communication error between the immobilizer system and the PCM. This is a security-related issue and can prevent the engine from starting.
• P1603 Immobilizer System Fault: A general fault within the immobilizer system is indicated by P1603.
• P1604 Immobilizer System Fault: P1604 is another code signaling a fault within the immobilizer system.
• P1605 Powertrain Control Module Keep Alive Memory Test Error: This code indicates a problem with the PCM’s Keep Alive Memory (KAM). KAM stores learned settings and adaptations, and errors here can affect engine and transmission performance.
• P1608 Powertrain Control Module (ECM CPU) DTC Test Fault: This code points to a fault during a diagnostic test of the Engine Control Module (ECM) CPU. This is an internal PCM/ECM issue.
• P1609 Powertrain Control Module (ECM CPU) Knock Sensor Circuit: This code indicates a problem in the knock sensor circuit monitored by the ECM CPU. Knock sensors detect engine knock or detonation, and issues here can impact engine protection systems.
• P1621 lmmobilizer System Fault: (Note: “lmmobilizer” likely a typo and should be “Immobilizer”) P1621 signals a fault within the immobilizer system.
• P1622 lmmobilizer System Fault: (Typo likely) P1622 also indicates an immobilizer system fault.
• P1623 lmmobilizer System Fault: (Typo likely) P1623 similarly points to an immobilizer system fault.
• P1624 lmmobilizer System Fault: (Typo likely) P1624 continues to indicate an immobilizer system fault. Multiple immobilizer fault codes might suggest a more complex issue within the security system.
• P1627 Powertrain Control Module (ECM/TCS) Line Communication Error: This code indicates a communication error on the line between the PCM/ECM and the Traction Control System (TCS).
• P1628 Powertrain Control Module (ECM/TCS) Any Line Communication Error: A more general communication error between the PCM/ECM and TCS is indicated by P1628.
• P1631 Generator Output Voltage Signal (No Output): This code points to a problem with the generator (alternator) not producing an output voltage signal. This is a charging system issue and will lead to battery drain and electrical problems.
• P1632 Battery Voltage Monitor Circuit: This code indicates a problem in the battery voltage monitor circuit. The vehicle monitors battery voltage to ensure proper system operation, and faults here can lead to inaccurate readings or system errors.
• P1633 Battery Overcharge Fault: P1633 signals a battery overcharge condition. Overcharging can damage the battery and other electrical components.
• P1634 Generator Terminal ‘B’ Circuit Open: This code indicates an open circuit in the ‘B’ terminal of the generator (alternator). The ‘B’ terminal is typically the main output terminal, and an open circuit will prevent charging.
• P1650 Power Steering Pressure Switch Out of Range Fault: This code indicates that the power steering pressure switch signal is out of the expected range. This switch is often used to inform the engine control system about power steering load.
• P1651 Power Steering Pressure Switch Circuit: A general fault in the power steering pressure switch circuit is indicated by P1651.
• P1652 Power Steering Pressure Switch Circuit: P1652 is another code indicating a fault within the power steering pressure switch circuit.
• P1701 Transmission Range Sensor Reverse Engagement Error: This code indicates an error related to the Transmission Range Sensor, specifically during reverse gear engagement. The range sensor tells the vehicle what gear is selected.
• P1702 Transmission Range Sensor Circuit Intermittent: An intermittent fault in the Transmission Range Sensor circuit is indicated by P1702.
• P1703 Brake On/Off Switch Out of Self Test Range: This code points to the Brake On/Off switch signal being out of range during a self-test. This switch is used for various systems, including cruise control and torque converter clutch control.
• P1705 Transmission Range Sensor out of Self Test Range: Similar to P1701, but indicating a general range issue during self-test, not just reverse engagement.
• P1709 Clutch Pedal Position Switch Circuit: This code is relevant for manual transmission vehicles and indicates a problem in the clutch pedal position switch circuit. This switch is used for engine control and potentially cruise control disengagement.
• P1711 Transmission Fluid Temperature Sensor Circuit out of Self Test Range: This code indicates that the Transmission Fluid Temperature (TFT) sensor signal is out of range during a self-test. TFT sensors are used for transmission control and protection.
• P1713 Transmission Fluid Temperature Sensor Circuit: A general fault in the TFT sensor circuit is indicated by P1713.
• P1714 Shift Solenoid ‘1’ Mechanical Fault: This code, and the following P1715, P1716, P1717, indicate mechanical faults in transmission shift solenoids. P1714 is for shift solenoid ‘1’. Mechanical faults could involve sticking or valve blockage.
• P1715 Shift Solenoid ‘2’ Mechanical Fault: P1715 indicates a mechanical fault in shift solenoid ‘2’.
• P1716 Shift Solenoid ‘3’ Mechanical Fault: P1716 indicates a mechanical fault in shift solenoid ‘3’.
• P1717 Shift Solenoid ‘4’ Mechanical Fault: P1717 indicates a mechanical fault in shift solenoid ‘4’. Shift solenoids are crucial for automatic transmission gear changes.
• P1718 Transmission Fluid Temperature Sensor Circuit: (Note: repeated code number, but different description from P1713) This P1718 again indicates a fault in the TFT sensor circuit, possibly a more specific type of fault than P1713.
• P1720 Vehicle Speed Sensor ‘2’ Signal Error: This code indicates a signal error from a secondary Vehicle Speed Sensor (‘2’). Some vehicles use multiple VSS for enhanced control.
• P1729 Transmission 4×4 Low Switch Error: This code is relevant for 4×4 vehicles and points to an error in the transmission 4×4 low switch circuit. This switch is used to engage low-range gearing.
• P1740 Torque Converter Clutch Solenoid Mechanical Fault: This code indicates a mechanical fault in the Torque Converter Clutch (TCC) solenoid. The TCC solenoid controls the engagement of the torque converter clutch, which improves fuel efficiency.
• P1741 Torque Converter Clutch Control Electrical Fault: An electrical fault in the TCC control circuit is indicated by P1741.
• P1742 Torque Converter Clutch Solenoid Shorted: P1742 specifically indicates a short circuit in the TCC solenoid.
• P1743 Torque Converter Clutch Failed On – TCIL is On: This code signifies that the torque converter clutch is stuck in the ‘on’ position, and the Transmission Control Indicator Lamp (TCIL) is illuminated (check transmission light).
• P1744 Torque Converter Clutch Solenoid Mechanical Fault: Another code indicating a mechanical fault with the TCC solenoid, possibly similar to P1740.
• P1746 Electronic Pressure Control Solenoid Circuit Open: This code points to an open circuit in the Electronic Pressure Control (EPC) solenoid circuit. The EPC solenoid controls transmission fluid pressure, crucial for smooth shifting.
• P1747 Electronic Pressure Control Solenoid Circuit: A general fault in the EPC solenoid circuit is indicated by P1747.
• P1749 Electronic Pressure Control Solenoid Circuit Low: P1749 specifically indicates a low circuit condition in the EPC solenoid circuit.
• P1751 Transmission Shift Solenoid ‘A’ Mechanical Fault: This code, and the following P1752, P1754, P1756, P1757, P1761, relate to transmission shift solenoids, using letter designations instead of numbers (A, B, etc.). P1751 is a mechanical fault in shift solenoid ‘A’.
• P1752 Transmission Shift Solenoid ‘A’ Circuit Shorted: P1752 indicates a short circuit in shift solenoid ‘A’ circuit.
• P1754 Transmission Coast Clutch Solenoid Electrical Fault: This code points to an electrical fault in the transmission coast clutch solenoid circuit. Coast clutches are used for specific transmission functions, like coasting or engine braking.
• P1756 Transmission Shift Solenoid ‘B’ Mechanical Fault: P1756 indicates a mechanical fault in shift solenoid ‘B’.
• P1757 Transmission Shift Solenoid ‘B’ Circuit Shorted: P1757 indicates a short circuit in shift solenoid ‘B’ circuit.
• P1761 Transmission Shift Solenoid ‘3’ Mechanical Fault: (Note: Number designation mixed with letter designations in previous codes) P1761 indicates a mechanical fault in shift solenoid ‘3’ (could be ‘C’ or another designation depending on the vehicle).
• P1762 Transmission SS3/SS4/OD Band Fault: This code indicates a fault with the transmission’s SS3 (Shift Solenoid 3), SS4 (Shift Solenoid 4), or Overdrive (OD) band. These are components within the automatic transmission related to gear selection and overdrive function.
• P1765 Transmission 3-2 Timing Solenoid Valve: This code points to a problem with the 3-2 timing solenoid valve in the transmission. This valve likely controls timing during 3rd to 2nd gear downshifts.
• P1767 Torque Converter Clutch Solenoid Circuit: (Note: Repeated code number, similar to P1741, but more general description) P1767 indicates a fault in the TCC solenoid circuit.
• P1771 Throttle Position Sensor Circuit Open to Transmission Control Module: This code indicates an open circuit in the Throttle Position Sensor (TPS) circuit specifically as it relates to the Transmission Control Module. The TCM uses TPS data for shift scheduling.
• P1772 Throttle Position Sensor Circuit Shorted to Transmission Control Module: Conversely, P1772 indicates a short circuit in the TPS circuit as it relates to the TCM.
• P1780 Transmission Control Switch Circuit: This code indicates a fault in the Transmission Control Switch circuit. This switch might be an overdrive on/off switch or a mode selector switch.
• P1780 Overdrive Off Switch not Cycled during the Self Test: (Note: repeated code number, but more specific description) This P1780 specifically indicates that the overdrive off switch was not cycled (activated and deactivated) during a self-test.
• P1781 Transmission 4×4 Low Switch out of Range Fault: Similar to P1729, but indicating an out-of-range signal from the 4×4 low switch, rather than just a general error.
• P1783 Transmission Fluid Temperature High Input: This code indicates that the TFT sensor is reporting a high temperature. Overheated transmission fluid can cause damage.
• P1788 3-2T/CCS Circuit Open: 3-2T/CCS likely refers to 3-2 Timing/Coast Clutch Solenoid. P1788 indicates an open circuit in this solenoid’s circuit.
• P1789 3-2T/CCS Circuit Shorted: P1789 indicates a short circuit in the 3-2 Timing/Coast Clutch Solenoid circuit.
• P1794 Powertrain Control Module Battery Direct Power Circuit: This code indicates a problem with the direct battery power supply circuit to the PCM. This is a critical power supply for the PCM’s memory and certain functions.
• P1797 P/N Switch Open or Short Circuit: P/N Switch stands for Park/Neutral switch. P1797 indicates an open or short circuit in the Park/Neutral switch circuit. This switch is used to inform the vehicle when it is in Park or Neutral, affecting starting and other functions.
• P1900 Turbine Speed Sensor Circuit Intermittent: This code indicates an intermittent signal from the Turbine Speed Sensor. Turbine speed sensors monitor input shaft speed in the transmission.
• P1901 Torque Converter Clutch Circuit Intermittent: P1901 indicates an intermittent fault in the Torque Converter Clutch circuit.

Diagnosing Your ’97 Probe with OBD2 Codes

When you encounter a check engine light in your ’97 Probe, the first step is to use an OBD2 scanner to retrieve the stored codes. These codes, like the ones listed above, provide valuable clues about potential problems.

Steps for using OBD2 and interpreting codes:

1. Connect an OBD2 Scanner: Locate the OBD2 port in your ’97 Probe (typically under the dashboard on the driver’s side). Plug in your OBD2 scanner.
2. Read the Codes: Turn the ignition key to the “ON” position (engine off). Follow your scanner’s instructions to read the stored codes.
3. Record the Codes: Write down all the codes that appear. Multiple codes can sometimes be related, but each should be investigated.
4. Research the Codes: Use resources like this guide or online databases to understand the meaning of each code. Focus on the descriptions relevant to your ’97 Probe and its systems.
5. Troubleshooting: Based on the code descriptions, you can begin troubleshooting. This might involve checking wiring, sensors, solenoids, or other components related to the code. However, for complex issues, professional diagnosis is highly recommended.
6. Clear the Codes (After Repair): Once you’ve addressed the issue, use your OBD2 scanner to clear the codes. This will turn off the check engine light.
7. Monitor: After clearing codes, monitor your ’97 Probe to ensure the check engine light does not reappear. If it does, the problem may not be fully resolved, or a new issue has arisen.

Importance of Professional Diagnosis

While OBD2 codes provide a great starting point, accurate diagnosis often requires professional expertise. A qualified mechanic can:

• Perform in-depth testing: Mechanics have specialized tools and knowledge to test components and circuits thoroughly.
• Consider vehicle-specific factors: Experience with ’97 Probes and similar vehicles helps them understand common issues and nuances.
• Accurately pinpoint the root cause: Codes can sometimes be misleading or indicate symptoms rather than the primary problem.
• Ensure proper repair: Professional repair ensures the problem is fixed correctly and avoids further damage.

Conclusion

Understanding OBD2 codes is empowering for ’97 Probe owners. This guide provides a foundation for interpreting potential issues indicated by these codes. By using this information in conjunction with professional advice when needed, you can effectively maintain your ’97 Probe and keep it running smoothly for years to come. Remember to prioritize safety and consult a qualified mechanic for accurate diagnosis and repair, especially when dealing with complex automotive systems.