toyota Workshop Repair Guides

Toyota Workshop Service and Repair Manuals

Circuit Opening Relay <--> [Fuel Pump Relay] > < Fuel Pump Speed Control Relay <--> [Fuel Pump Ballast Resistor Relay]|Description and Operation
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Fuel Pump Speed Control Relay: Testing and Inspection

FUEL PUMP RELAY:

1. Unplug electrical connector from Fuel Pump Relay.
2. Using an Ohmmeter, check that there is continuity between terminals 1 and 3.

Checking Fuel Pump Relay

3. Check that there is continuity between terminals 2 and 3.
4. Check that there is NO continuity between terminals 3 and 4.
5. If not as specified, replace Fuel Pump Relay.
6. Connect battery current across terminals 1 and 3.

Checking Fuel Pump Relay Operation - Current Applied

7. Check that there is NO continuity between terminals 2 and 3.
8. Check that there is continuity between terminals 3 and 4.
9. If not as specified, replace Fuel Pump Relay.

10. Reconnect connector to Fuel Pump Relay.

FUEL PUMP RESISTOR:

1. Unplug the resistor, located in the rear of the engine compartment.
2. Using an Ohmmeter, measure the resistance between the terminals.

Measuring Fuel Pump Resistor Resistance

Resistance:

approx. 0.73 Ohms

3. If resistance is not as specified, replace the Fuel Pump Resistor.
4. Reconnect the resistor electrical plug.

Circuit Opening Relay <--> [Fuel Pump Relay] > < Fuel Pump Speed Control Relay <--> [Fuel Pump Ballast Resistor Relay]|Description and Operation