what does check engine light code C1231 mean for my Toyota RAV4

Solution

1. Preparation

• Gather necessary tools and parts.
• Park the vehicle on a flat surface and engage the parking brake.
• Disconnect the vehicle's battery to ensure safety while working on electrical components.

2. Inspect ABS Sensors

• Remove the wheel covers or tires if necessary to access the ABS sensors.
• Disconnect the electrical connector from each ABS sensor.
• Visually inspect each sensor for damage or dirt; clean if necessary.
• Use a multimeter to check the resistance of each sensor; it should be within manufacturer specifications.

3. Inspect ABS Module and Wiring

• Locate the ABS control module, typically near the master cylinder or under the dashboard.
• Check for loose connections or corrosion; clean connections with electrical contact cleaner if needed.
• Inspect the wiring harness for any signs of wear, fraying, or damage that may cause intermittent signals.

4. Test ABS Pump

• Reconnect the battery and use an OBD-II scanner to perform a functional test of the ABS pump.
• If the pump does not activate, further testing may be needed to isolate the issue, such as checking power and ground circuits to the pump.

5. Clear Codes and Test Drive

• After completing the repairs, clear the C1231 code using the OBD-II scanner.
• Perform a test drive to ensure the ABS system is functioning properly and the check engine light does not reappear.