INSTALLATION PROCEDURE 1. INSTALL WATER PUMP ASSEMBLY
2. INSTALL WATER PUMP PULLEY (a) Temporarily install the water pump pulley with the 4 bolts.
3. INSTALL WATER INLET HOUSING (a) Install a new gasket to the water pump assembly.
4. CONNECT NO. 5 WATER BY-PASS HOSE
5. CONNECT NO. 8 WATER BY-PASS HOSE
6. INSTALL NO. 1 WATER BY-PASS HOSE
7. INSTALL WATER INLET SUB-ASSEMBLY WITH THERMOSTAT (See page
8. INSTALL FAN SHROUD (See page
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Toyota Tundra Service Manual > Sfi System: Fuel Pump Control Circuit
DESCRIPTION The fuel pump circuit consists of the ECM, fuel pump and fuel pump ECU (which operates the fuel pump). Based on the engine output, the ECM determines the fuel pump speed. The speed is then converted to a duty signal and sent to the fuel pump ECU. Based on the signal sent from the ECM, th ...