modulator common shorted to ground SPN 802

The code SPN 802 FMI 4 indicates a modulator common shorted to ground. This fault typically points to an issue with the ABS module or its wiring. Here are some steps to troubleshoot this issue:

1. Check the ABS Modulator Relays and Wiring: Inspect the relays and wiring for any visible damage or loose connections.

2. Perform a Pin-to-Pin Continuity Test: This test helps identify any excessive resistance or short circuits in the wiring.

3. Inspect the ABS Module Harness: Look for any signs of rubbing or damage that could cause a short.

4. Check Ground Connections: Ensure that all ground connections are secure and free from corrosion.

5. Test the ABS Module: If the above steps don't resolve the issue, the ABS module itself might be faulty and may need replacement.

If you're not comfortable performing these checks yourself, it might be best to consult a professional mechanic.