Modules, Relays & Solenoids: Relays
Turn ignition off. Disconnect fuel pump relay. Set DVOM on 200-ohm scale. On ISO relays, measure resistance between terminals No. 85 and 86. See Fig 1 . On all other relays, measure resistance between VPWR pin and FUEL PUMP circuit pin at fuel pump relay. On all relays, both readings should be 40-85 ohms. Set DVOM to 10-k/ohm scale. On ISO relays, measure resistance between terminal No. 85 and terminals No. 30 and 87. On all other relays, measure resistance between FUEL PUMP circuit terminal and both POWER-TO-PUMP and B+ pins at fuel pump relay. On all relays, if all readings are more than 10,000 ohms, relay is okay. If any reading is 10,000 ohms or less, replace fuel pump relay.