LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Lexus >> 2008 >> GS 450h >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - DTC P0136 - P0560 >> DTC P0230 Fuel Pump Primary Circuit >> Inspection Procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Inspection Procedure

  1. PERFORM ACTIVE TEST USING TECHSTREAM 
    1. Connect the Techstream to the DLC3.
    2. Turn the power switch on (IG) and turn the Techstream on.
    3. Enter the following menus: Powertrain / Engine and ECT / Active Test / Active the Fuel Pump Speed Control.
    4. Check the operation of the relay while operating it using the Techstream.

    OK: 

    Operating noise can be heard from the relay. 

    OK: CHECK FOR INTERMITTENT PROBLEMS 

    NG: Go to next step 

  2. INSPECT RELAY (Marking: F/PMP) 
    1. Remove the F/PMP relay from the engine room No. 1 relay block.
    2. Measure the resistance of the F/PMP relay.

    Standard resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    3 - 4 Below 1 Ω
    3 - 4 10 kΩ or more (when battery voltage is applied to terminals 1 and 2)
    Fig 1: Inspecting Relay (Marking F/PMP)
    G04942765Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE RELAY 

    OK: Go to next step 

  3. CHECK HARNESS AND CONNECTOR (F/PMP RELAY - ECM) 
    1. Remove the F/PMP relay from the engine room No. 1 relay block.
    2. Disconnect the A53 ECM connector.
    3. Measure the resistance.

    Standard resistance 

    TESTER CONNECTION AND SPECIFIED CONDITION

    Tester Connection Specified Condition
    F/PMP relay (2) - FPR (A53-6) Below 1 Ω
    F/PMP relay (2) or FPR (A53-6) - Body ground 10 kΩ or higher
    Fig 2: Identifying (F/PMP) Relay
    G05302366Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE ECM 

scientia non olet · About LEMON Manuals