INSPECTION PROCEDURE 1. INSPECT FUEL PUMP (a) Inspect the resistance of the fuel pump. (1) Measure the resistance according to the value(s) in the table below. Standard Resistance:
If the result is not as specified, replace the fuel pump. (b) Inspect the operation of the fuel pump. (1) Connect the battery's positive (+) lead to terminal 1 of the connector, and the negative (-) lead to terminal 2. Check that the fuel pump operates. NOTICE:
If the result is not as specified, replace the fuel pump. |
Toyota Tundra Service Manual > Sfi System: ECM Power Source Circuit
DESCRIPTION When the ignition switch is turned to ON, the battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes a current to flow to the coil, closing the contacts of the integration relay (EFI relay) and supplying power to terminals + ...