Fuel Pump Control Circuit 2ZR-FXE

Fuel Pump Control Circuit

Description

Wiring diagram

Inspection procedure

Perform active test using intelligent tester (control the fuel pump/speed)

Inspect no. 2 integration relay (c/opn relay)

Check harness and connector (no. 2 integration relay (c/opn relay) - ecm)

Check harness and connector (no. 2 integration relay (c/opn relay - ig2 relay))

Check harness and connector (no. 2 integration relay (c/opn relay) - fuel pump)

Check harness and connector (fuel pump - body ground)

Inspect fuel pump

Check ecm power source circuit

Description

When the NE signal is input to the ECM, Tr is turned on, current flows to the coil of the C/OPN (circuit opening) relay, the relay switches on, power is supplied to the fuel pump and the fuel pump operates. While the NE signal is generated (engine running), the ECM keeps Tr on (C/OPN relay on) and the fuel pump also keeps operating.

Wiring diagram

Inspection procedure

NOTICE:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (CONTROL THE FUEL PUMP/SPEED)

1. Connect the intelligent tester to the DLC3.

2. Turn the power switch on (IG).

3. Turn the tester on.

4. Enter the following menus: Powertrain / Engine and ECT / Active Test / Control the Fuel Pump/Speed.

5. 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 SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

2.INSPECT NO. 2 INTEGRATION RELAY (C/OPN RELAY)

1. Inspect the No. 2 integration relay (C/OPN relay ) .

NG	REPLACE NO. 2 INTEGRATION RELAY

OK

3.CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (C/OPN RELAY) - ECM)

1. Disconnect the ECM connector.

2. Remove the No. 2 integration relay from the engine room relay block.

3. Disconnect the No. 2 integration relay connector.

4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   1B-7 - A60-8 (FC)	Always	Below 1 ?
   1B-7 or A60-8 (FC) - Body ground	Always	10 k? or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

4.CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (C/OPN RELAY - IG2 RELAY))

1. Remove the No. 2 integration relay from the engine room relay block.

2. Disconnect the No. 2 integration relay connector.

3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   1A-4 - 1B-6	Always	Below 1 ?
   1A-4 or 1B-6 - Body ground	Always	10 k? or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

5.CHECK HARNESS AND CONNECTOR (NO. 2 INTEGRATION RELAY (C/OPN RELAY) - FUEL PUMP)

1. Disconnect the fuel pump connector.

2. Remove the No. 2 integration relay from the engine room relay block.

3. Disconnect the No. 2 integration relay connector.

4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   1B-8 - P9-4	Always	Below 1 ?
   1B-8 or P9-4 - Body ground	Always	10 k? or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

6.CHECK HARNESS AND CONNECTOR (FUEL PUMP - BODY GROUND)

1. Disconnect the fuel pump connector.

2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance:

   Tester Connection	Condition	Specified Condition
   P9-5 - Body ground	Always	Below 1 ?

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

7.INSPECT FUEL PUMP

1. Inspect the fuel pump .

NG	REPLACE FUEL PUMP

OK

8.CHECK ECM POWER SOURCE CIRCUIT

1. Check the ECM power source circuit .

NG	REPAIR OR REPLACE ECM POWER SOURCE CIRCUIT

OK
REPLACE ECM