X166 - Check LFP Relay
- Key "OFF".
- Low Speed Fuel Pump (LFP) relay disconnected.
- Digital Volt/Ohm Meter (DVOM) on 200 ohm scale.
Fuel Pump Relay Connector:
- Measure LFP relay coil resistance between the LFP pin and VPWR pin at the fuel pump relay. Resistance should be between 40 and 85 ohms.
- DVOM on 10,000 ohm scale.
- Check LFP relay for internal shorts: Measure resistance between the LFP pin and both the power-to-pump and B(+) pins. Both resistances should be greater than 10,000 ohms.
- Are all resistance checks OK?
Yes -- Go to X167. X167 - Check LFP Circuit For Short to Power
No -- Replace LFP relay. Rerun quick test. Quick Test Appendix (Detailed Testing Instructions)