KF5 - Check Continuity of LFC/HFC Circuit

- Key "OFF".

- Low Fan Control (LFC) or High Fan Control (HFC) relay disconnected.

- Disconnect Powertrain Control Module (PCM). Inspect for damaged or pushed out pins, corrosion, loose wires, etc. Service as necessary.

- Install breakout box, leave PCM disconnected.

- For Diagnostic Trouble Code (DTC) 563:

- Measure resistance between test pin 31 at the breakout box and HFC circuit at the HFC relay vehicle harness connector.

- For DTC 564:

- Measure resistance between test pin 35 at the breakout box and LFC circuit at the LFC relay vehicle harness connector.

- Is resistance less than 5.0 ohms?

Yes -- Go to KF6. KF6 - Check LFC/HFC Circuit For Shorts to Power

No -- Service open circuit. Remove breakout box. Reconnect all components. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)