Fuel Pump Control Circuit: Procedure

WARNING: This page is about a different car, the 2010 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST USING TECHSTREAM (OPERATE C/OPN RELAY)
1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON and turn the Techstream on.
3. Select the following menu items: Powertrain / Engine / Active Test / Control the Fuel Pump / Speed.
4. Check whether the fuel pump operation sound occurs when performing the Active Test on the tester.
  OK
  
  Fuel pump operating sound occurs.
NG → See step 3

OK → See step 2
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE
CHECK ECM POWER SOURCE CIRCUIT
1. Check the ECM power source circuit. Refer to ECM Power Source Circuit .
NG → REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT

OK: Go to next step

INSPECT ENGINE ROOM JUNCTION BLOCK (C/OPN RELAY)

Remove the engine room junction block from the engine room relay block.

Fig 1: Identifying Engine Room Junction Block & Engine Room Relay Block
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Inspect the C/OPN relay.

Measure the C/OPN relay resistance.

Standard resistance

Tester Connections	Condition	Specified Conditions
1E-7 - 1E-13	Always	10 kΩ or higher
1E-7 - 1E-13	Always	Below 1 Ω (Apply battery voltage between terminals 1D-12 and 1E-8)

Reinstall the integration relay.

NG → REPLACE ENGINE ROOM JUNCTION BLOCK

OK: Go to next step

INSPECT ECM (FC VOLTAGE)

Disconnect the ECM connectors.

Fig 2: Identifying A55 And C55 ECM Connectors
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
Turn the ignition switch to ON.

Measure the voltage between the terminals of the A55 and C55 ECM connectors.

Standard voltage

Tester Connection	Condition	Specified Condition
FC (A55-7) - E1 (C55-81)	Ignition switch ON	11 to 14 V

Reconnect the ECM connectors.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (ECM - BATTERY)

OK: Go to next step

INSPECT FUEL PUMP
1. Inspect the fuel pump. Refer to INSPECTION .
NG → See step 9

OK: Go to next step

CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP - BODY GROUND)

Check the harness and the connectors between the engine room relay block and the fuel pump.

Fig 3: Checking Harness And Connector (C/OPN Relay - Fuel Pump - Body Ground)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Disconnect the engine room junction block connector.
Disconnect the fuel pump connector.

Measure the resistance.

Standard resistance (Check for open)

Tester Connections	Condition	Specified Conditions
1E-13 - N10-4 (Fuel pump)	Always	Below 1 Ω

Standard resistance (Check for short)

Tester Connections	Condition	Specified Conditions
1E-13 or N10-4 (Fuel pump) - Body ground	Always	10 kΩ or higher

Check the harness and the connectors between the fuel pump and body ground.

Disconnect the fuel pump connector.

Measure the resistance.

Standard resistance (Check for open)

Tester Connection	Condition	Specified Condition
N10-5 (Fuel pump) - Body ground	Always	Below 1 Ω

Reconnect the engine room junction block connector.
Reconnect the fuel pump connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 8

REPLACE ECM. Refer to REMOVAL
REPLACE FUEL PUMP. Refer to REMOVAL