Inspection Procedure

1. OK: Go to step   7 . 
2. NG: Go To Next Step. 

PREPARATION: 

1. Remove the luggage compartment trim cover (See FUEL PUMP ECU ).
2. Disconnect the fuel pump ECU connector.
3. Turn the ignition switch ON.

CHECK: 

Measure the voltage between terminal 10 of the fuel pump ECU connector and body ground.

OK: 

1. Voltage: 9 to 14 V 

Fig 1: Checking Voltage Between Terminal 10 Of Fuel Pump ECU Connector & Body Ground

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. NG: Check for open and short in harness and connector between EFI main relay (Marking: EFI) and fuel pump ECU (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
2. OK: Go To Next Step. 

PREPARATION: 

1. Remove the luggage compartment trim cover (See FUEL PUMP ECU ).
2. Disconnect the fuel pump ECU connector.

CHECK: 

Measure the voltage between terminals 5 and 8 of the fuel pump ECU connector when the ignition switch is turned to the START position.

OK: 

1. Voltage: 3.3 to 4.3 V 

Fig 2: Checking Voltage Between 5 & 8 Fuel Pump ECU Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. OK: Go to step   5 . 
2. NG: Go To Next Step. 

1. NG: Repair or replace harness or connector. 
2. OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 

1. NG: Repair or replace fuel pump. 
2. OK: Go To Next Step. 

1. NG: Repair or replace harness or connector. 
2. OK: Replace fuel pump ECU. 

1. NG: Repair or replace harness or connector. 
2. OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ).