Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Inspection Procedure
- PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE C/OPN RELAY)
- Connect the Techstream to the DLC3.
- Turn the ignition to switch to ON.
- Turn the Techstream on.
- Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump / Speed.
- Check whether the fuel pump operation sound occurs when performing the Active Test on the tester.
OK: Fuel pump operating sound occurs .
NG: Go to step 2
OK: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE (See PROBLEM SYMPTOMS TABLE )
- INSPECT FUSE (IGN FUSE)
- Remove the IGN fuse from the driver side junction block.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition IGN fuse Always Below 1 Ω - Reinstall the IGN fuse.
NG: CHECK FOR SHORTS IN ALL HARNESSES AND CONNECTORS CONNECTED TO FUSE AND REPLACE FUSE
OK: Go to next step
- INSPECT DRIVER SIDE JUNCTION BLOCK (C/OPN RELAY)
- Disconnect the driver side junction block connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition 2A-8 - 2B-11 Always 10 kΩ or higher Apply battery voltage to terminals 2B-10 and 2B-9 Below 1 Ω - Reconnect the driver side junction block connector.
NG: REPLACE DRIVER SIDE JUNCTION BLOCK (C/OPN RELAY)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)
- Disconnect the ECM connector.
- Disconnect the driver side junction block connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open)
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition 2B-10 - A37-7 (FC) Always Below 1 Ω Standard Resistance (Check for Short)
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition 2B-10 or A37-7 (FC) - Body ground Always 10 kΩ or higher - Reconnect the ECM connector.
- Reconnect the driver side junction block connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - ECM)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (C/OPN RELAY - INTEGRATION RELAY (EFI MAIN RELAY))
- Remove the integration relay from engine room junction block.
- Disconnect the integration relay connector.
- Disconnect the driver side junction block connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open)
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition 2B-11 - 1B-4 Always Below 1 Ω Standard Resistance (Check for Short)
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition 2B-11 or 1B-4 - Body ground Always 10 kΩ or higher - Reconnect the driver side junction block connector.
- Reconnect the integration relay connector.
- Reinstall the integration relay.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - INTEGRATION RELAY (EFI MAIN RELAY))
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP)
- Disconnect the fuel pump connector.
- Disconnect the driver side junction block connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance (Check for Open)
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition 2A-8 - L13-4 Always Below 1 Ω Standard Resistance (Check for Short)
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition 2A-8 or L13-4 - Body ground Always 10 kΩ or higher - Reconnect the fuel pump connector.
- Reconnect the driver side junction block connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (C/OPN RELAY - FUEL PUMP)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
OK: Go to next step
- CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)
- Disconnect the fuel pump connector.
- Measure the resistance according to the value(s) in the table below.
Standard Resistance
TESTER CONNECTION SPECIFIED CONDITION CHARTTester Connection Condition Specified Condition L13-5 - Body ground Always Below 1 Ω - Reconnect the fuel pump connector.
NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PUMP - BODY GROUND)
OK: Go to next step
- INSPECT FUEL PUMP ASSEMBLY
- Inspect the fuel pump assembly (See
INSPECTION
).
NG: REPLACE FUEL PUMP ASSEMBLY (See REMOVAL )
OK: Go to next step
- Inspect the fuel pump assembly (See
INSPECTION
).
- CHECK ECM POWER SOURCE CIRCUIT
- Check the ECM power source circuit (See
ECM POWER SOURCE CIRCUIT ).
NG: REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT
OK: REPLACE ECM (See REMOVAL )
- Check the ECM power source circuit (See
ECM POWER SOURCE CIRCUIT ).
Use the Manual With the Right Hardware
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.