51A6-Fault Present In Engine Controller: Testing

WARNING: This page is about a different car, the 2009 Dodge Sprinter. However, it is still accessible from the selected car via links, so may be relevant.

ENGINE CONTROL MODULE
1. Check for any TSBs that may apply to this fault code.
2. Verify that the Engine Control Module is at the latest calibration level.
3. Check the Engine Control Module ground circuits with a test light connected to B+.
4. Check the Engine Control Module Fused B+ circuit with a test light connected to ground.
5. Check the Engine Control Module Main Relay circuits with a test light connected to ground.
  Do the ECM power and ground circuits light the test light brightly.
  
  Yes
  - Replace and program the Engine Control Module in accordance with the Service Information.
  - Perform the ECM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .
  No
  - Repair the circuit for an open or shorted condition.
  - Perform the ECM VERIFICATION TEST. Refer to DTC-Based Diagnostics/MODULE, Engine Control (ECM) - Standard Procedure .