REMOVAL PROCEDURE 1. PRECAUTION NOTICE: After
turning the ignition switch off, waiting time may be required before
disconnecting the cable from the battery terminal. Therefore, make sure
to read the disconnecting the cable from the battery terminal notice
before proceeding with work (See page 2. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL CAUTION: Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system. NOTICE: Some systems need to be initialized after the cable is reconnected (See page
3. REMOVE V-BANK COVER SUB-ASSEMBLY 4. REMOVE NO. 1 ENGINE UNDER COVER 5. REMOVE AIR CLEANER ASSEMBLY 6. REMOVE FAN AND GENERATOR V BELT 7. DRAIN POWER STEERING FLUID 8. DISCONNECT WIRE HARNESS CLAMP
9. DISCONNECT NO. 1 OIL RESERVOIR TO PUMP HOSE
10. DISCONNECT POWER STEERING OIL PRESSURE SENSOR CONNECTOR
11. DISCONNECT PRESSURE FEED TUBE
(b) Remove the gasket. 12. REMOVE VANE PUMP ASSEMBLY
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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 + ...