X26 - FC/LFC Circuit Fault Isolation Check

- Key "OFF".

- Breakout box installed, Powertrain Control Module (PCM) disconnected.

- Reconnect Constant Control Relay Module (CCRM).

- Key "ON", engine "OFF".

- Jumper test pin 13 to test pin 40 or 60 at the breakout box.

- Does fan continue to run?

Yes -- Key "OFF". Remove jumper. If Diagnostic Trouble Code (DTC) 563 was also present with the 564, go to X150. X150 - Check HFC Circuit For Short to Ground

If not, replace CCRM. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- Replace PCM. Remove breakout box and jumper. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)