KF2 - Check For LFC/HFC Circuit Cycling

- Enter Output State test mode. Refer to Quick Test (Extracting and Clearing Codes)/Output State Diagnostic Test Mode. Output State Diagnostic Test Mode

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

- Digital Volt/Ohm Meter (DVOM) on 20 volt scale.

- Connect DVOM positive test lead to the VPWR circuit and the negative test lead to the LFC or HFC circuit at the LFC/HFC relay vehicle harness connector.

- Depress and release throttle to cycle outputs off.

- While observing DVOM, depress throttle again. For LFC, wait until the Malfunction Indicator Light (MIL) flashes once (10 seconds). For HFC, wait until the MIL flashes twice (15 seconds). Release throttle. The LFC or HFC output is now "on." To cycle "off," depress and release throttle.

- Does voltage cycle high and low (about 1.0 volt change)?

Yes -- Replace LFC or HFC relay. Remove jumper. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)

No -- With DTC 563, remain in Output State test mode. Leave DVOM connected. Go to KF3. KF3 - Verify Dual Function A/C Pressure Switch Not Closed

With DTC 564, go to KF4. KF4 - Check Continuity of LFC/HFC Circuit