For automotive enthusiasts and DIY mechanics, diagnosing car troubles can often feel like deciphering a complex code. While modern vehicles utilize OBD2 systems, older models, particularly those from Chrysler, operate on OBD1. The challenge arises when you own an OBD2 scanner and need to troubleshoot a classic Chrysler. Fortunately, solutions exist, and the Actron Obd1 And Obd2 Scanner, when paired with the right adapter, becomes a powerful tool for bridging this diagnostic gap.
The original poster in a forum thread highlighted a game-changing discovery: an Actron 9145 OBD2 scanner, a tool many already own for their newer vehicles, can also read OBD1 codes on older Chrysler models. This is achieved by using a specific adapter cable, such as the Actron CP9129 Chrysler adapter. For around $25, this adapter unlocks a hidden layer of functionality in your existing scanner, allowing it to interface with the OBD1 diagnostic port typically found near the Engine Control Unit (ECU) in older Chryslers.
But the question arises: does this setup simply replicate the basic code reading achievable through the ignition key trick on older vehicles? The answer is a resounding no. Utilizing the Actron scanner with the OBD1 adapter goes far beyond basic code retrieval. It unlocks a suite of advanced diagnostic features that empower you to delve deeper into your Chrysler’s systems.
This user’s exploration revealed a range of impressive capabilities after connecting their Actron scanner to their Chrysler with the adapter. Beyond just reading and resetting fault codes, the Actron scanner provides access to real-time data and diagnostic tests that are invaluable for pinpointing issues. Among the tested features are:
- Battery Temperature: Monitors the battery’s thermal condition, crucial for battery health and charging system diagnostics.
- Charging Voltage: Displays the voltage output of the charging system, essential for identifying alternator or voltage regulator problems.
- A/C Clutch Relay Operation: Tests the functionality of the air conditioning clutch relay, aiding in A/C system troubleshooting.
- Brake Switch Operation: Verifies the brake switch’s functionality, important for brake light and cruise control system diagnosis.
- Actuator Tests: Checks the operation of ECU-controlled relays, allowing for component-level diagnostics.
- Idle Speed Test: Provides the ability to vary engine RPM for idle speed adjustments and diagnostics.
- Simulates Closed / Open Loop Operation: Allows for testing in both closed and open loop modes to diagnose fuel and emissions systems.
- ASD Relay Operation & Shut-Down Voltage: Tests the Automatic Shutdown (ASD) relay and its voltage, critical for engine management system diagnostics.
- Sensor Output Voltage Tests (IAT, CPS, AIT, MAP, etc.): Enables voltage readings from various sensors like Intake Air Temperature (IAT), Crankshaft Position Sensor (CPS), Air Intake Temperature (AIT), and Manifold Absolute Pressure (MAP), crucial for sensor-related fault finding.
The Actron scanner, when used in OBD1 Chrysler mode, requires vehicle-specific programming via intuitive drop-down menus. These menus extend back to 1989 models, suggesting compatibility with a wide range of older Chrysler vehicles equipped with the 6-pin diagnostic connector. This broad compatibility makes it a versatile tool for owners of classic Chrysler, Dodge, and Jeep vehicles.
It’s important to note a key limitation: Renix systems, found in some older Jeep models, are not compatible with this OBD1 adapter approach. Renix systems utilize different diagnostic connectors and protocols, requiring specialized dealership tools like the DRB analyzer with a Renix interface card. Therefore, owners of Renix-equipped vehicles will need to explore alternative diagnostic methods.
In conclusion, for owners of compatible older Chrysler vehicles, combining an Actron OBD2 scanner with an OBD1 Chrysler adapter like the CP9129 unlocks a powerful and cost-effective diagnostic solution. It transcends basic code reading, offering a range of advanced features that rival professional-grade diagnostic tools, making it an invaluable asset for troubleshooting and maintaining your classic Chrysler.
