2NZ-FE ENGINE CONTROL  SFI SYSTEM  Fuel Pump Control Circuit  


DESCRIPTION

When the engine is cranked, the starter (ST NO. 1) relay drive signal output from the ignition or starter switch assembly is input into the STA terminal of the ECM, and the NE signal generated by the crankshaft position sensor is also input into the NE+ terminal. The ECM interprets that the engine is cranked, and turns transistor Tr1 in the ECM internal circuit on. Current flows to the C/OPN relay by turning Tr1 on. Then, the fuel pump operates.

While the NE signal is input into the ECM with the engine running, the ECM turns Tr1 on continuously.

WIRING DIAGRAM

A325080E05
2.104,2.094 4.469,2.333 2.365,0.24 10 false Ignition Switch Assembly 2.594,3.74 2.938,3.958 0.344,0.219 10 false IG2 2.24,4.406 3.01,4.677 0.771,0.271 10 false EFI-MAIN 2.927,4.927 3.698,5.198 0.771,0.271 10 false EFI-MAIN 4.073,4.542 5.135,4.844 1.063,0.302 10 false C/OPN NO. 1 0.479,5.74 1.25,6.01 0.771,0.271 10 false FL MAIN 0.656,6.667 1.427,6.938 0.771,0.271 10 false Battery 2.75,6.448 3.521,6.719 0.771,0.271 10 false Fuel Pump 3.75,5.979 5.427,6.281 1.677,0.302 10 false from STA Signal Circuit 3.729,6.583 5.26,6.99 1.531,0.406 10 false from Crankshaft Position Sensor 0.823,3.313 1.167,3.531 0.344,0.219 10 false IG2 0.49,2.01 0.885,2.26 0.396,0.25 10 false AM2 2.406,1.5 2.802,1.75 0.396,0.25 10 false AM2 2.979,1.5 3.323,1.719 0.344,0.219 10 false IG2 2.26,1.49 2.656,1.74 0.396,0.25 10 false 4 3.281,1.49 3.677,1.74 0.396,0.25 10 false 3 2.344,3.042 2.74,3.302 0.396,0.26 10 false 3 2.344,3.365 2.74,3.625 0.396,0.26 10 false 2 3.042,3.031 3.438,3.292 0.396,0.26 10 false 5 3.031,3.365 3.427,3.625 0.396,0.26 10 false 1 2.854,4.135 3.25,4.396 0.396,0.26 10 false 5 2.865,4.583 3.26,4.844 0.396,0.26 10 false 2 3.531,4.125 3.927,4.385 0.396,0.26 10 false 3 3.531,4.594 3.927,4.854 0.396,0.26 10 false 1 3.927,3.76 4.323,4.021 0.396,0.26 10 false 1 3.927,4.125 4.323,4.385 0.396,0.26 10 false 5 4.615,3.74 5.01,4 0.396,0.26 10 false 2 4.604,4.135 5,4.396 0.396,0.26 10 false 3 2.438,5.865 2.833,6.115 0.396,0.25 10 false 4 2.427,6.083 2.823,6.333 0.396,0.25 10 false B 2.427,6.594 2.823,6.844 0.396,0.25 10 false E 2.448,6.833 2.844,7.094 0.396,0.26 10 false 5 2.75,6.292 3.521,6.563 0.771,0.271 10 false L20 2.104,1.938 4.469,2.177 2.365,0.24 10 false E4 5.792,3.844 6.563,4.115 0.771,0.271 10 false A56 5.802,4.698 6.573,4.969 0.771,0.271 10 false A56 5.802,5.979 6.573,6.25 0.771,0.271 10 false A56 5.802,6.5 6.573,6.771 0.771,0.271 10 false B56 5.813,6.833 6.583,7.104 0.771,0.271 10 false B56 5.813,6.667 6.583,6.938 0.771,0.271 10 false 121 5.813,6.323 6.583,6.594 0.771,0.271 10 false 122 5.844,5.802 6.615,6.073 0.771,0.271 10 false 48 5.854,4.51 6.625,4.781 0.771,0.271 10 false 44 5.875,3.667 6.646,3.938 0.771,0.271 10 false 7 6.135,3.75 6.906,4.021 0.771,0.271 10 false FC 6.646,3.688 7.156,3.958 0.51,0.271 10 false Tr1 6.146,4.698 6.917,4.969 0.771,0.271 10 false MREL 6.156,6 6.927,6.271 0.771,0.271 10 false STA 6.156,6.51 6.927,6.781 0.771,0.271 10 false NE+ 6.146,6.854 6.917,7.125 0.771,0.271 10 false NE- 6.365,7.198 7.135,7.469 0.771,0.271 10 false ECM

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.PERFORM ACTIVE TEST USING GTS (CONTROL THE FUEL PUMP / SPEED)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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

Powertrain > Engine and ECT > Active Test
Tester Display
Control the Fuel Pump / Speed
50004 234 5

e.

Check whether the fuel pump operating sounds occurs when performing the Active Test on the GTS.


Result:
Result Proceed to
Fuel pump operating sound does not occur A
Fuel pump operating sound occurs B



A

2.CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN NO. 1 RELAY)

B

10.READ VALUE USING GTS (STARTER SIGNAL)
2.CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN NO. 1 RELAY)
A314191C01
0.146,0.146 0.458,0.302 0.313,0.156 10 false *1 0.302,1.927 0.615,2.083 0.313,0.156 10 false *2
*1 Engine Room Relay Block and Junction Block Assembly
*2 C/OPN NO. 1 Relay


a.

Remove the C/OPN NO. 1 relay from the engine room relay block and junction block assembly.


b.

Turn the ignition switch to ON.


c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
1 (C/OPN NO. 1 relay) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

3.INSPECT C/OPN NO. 1 RELAY

NG

9.CHECK HARNESS AND CONNECTOR (C/OPN NO. 1 RELAY - IG2 RELAY)
3.INSPECT C/OPN NO. 1 RELAY
a.

Inspect the C/OPN NO. 1 relay.

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>RELAY>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (C/OPN NO. 1 RELAY - ECM)

NG

REPLACE C/OPN RELAY

4.CHECK HARNESS AND CONNECTOR (C/OPN NO. 1 RELAY - ECM)
a.

Remove the C/OPN NO. 1 relay from the engine room relay block and junction block assembly.


b.

Disconnect the ECM connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
2 (C/OPN NO. 1 relay) - A56-7 (FC) Always Below 1 Ω
2 (C/OPN NO. 1 relay) or A56-7 (FC) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (C/OPN NO. 1 RELAY - FUEL PUMP)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK HARNESS AND CONNECTOR (C/OPN NO. 1 RELAY - FUEL PUMP)
a.

Remove the C/OPN NO. 1 relay from the engine room relay block and junction block assembly.


b.

Disconnect the fuel pump connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
3 (C/OPN NO. 1 relay) - L20-4 (B) Always Below 1 Ω
3 (C/OPN NO. 1 relay) or L20-4 (B) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Disconnect the fuel pump connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
L20-5 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

7.INSPECT FUEL PUMP

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.INSPECT FUEL PUMP
a.

Inspect the fuel pump.

Click hereEngine / Hybrid System>2NZ-FE FUEL>FUEL PUMP>INSPECTION


Result:
Proceed to
OK
NG



OK

8.CHECK HARNESS AND CONNECTOR (C/OPN NO. 1 RELAY - EFI-MAIN RELAY)

NG

REPLACE FUEL PUMP

Click hereEngine / Hybrid System>2NZ-FE FUEL>FUEL PUMP>REMOVAL


8.CHECK HARNESS AND CONNECTOR (C/OPN NO. 1 RELAY - EFI-MAIN RELAY)
a.

Remove the C/OPN NO. 1 relay and EFI-MAIN relay from the engine room relay block and junction block assembly.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
5 (C/OPN NO. 1 relay) - 3 (EFI-MAIN relay) Always Below 1 Ω
5 (C/OPN NO. 1 relay) or 3 (EFI-MAIN relay) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

GO TO ECM POWER SOURCE CIRCUIT

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>SFI SYSTEM>ECM Power Source Circuit


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK HARNESS AND CONNECTOR (C/OPN NO. 1 RELAY - IG2 RELAY)
a.

Remove the C/OPN NO. 1 relay and IG2 relay from the engine room relay block and junction block assembly.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
1 (C/OPN NO. 1 relay) - 5 (IG2 relay) Always Below 1 Ω
1 (C/OPN NO. 1 relay) or 5 (IG2 relay) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

GO TO ECM POWER SOURCE CIRCUIT

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>SFI SYSTEM>ECM Power Source Circuit


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.READ VALUE USING GTS (STARTER SIGNAL)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Starter Signal.

Powertrain > Engine and ECT > Data List
Tester Display
Starter Signal
50003 234 118

e.

Check the result when the ignition switch is ON and the engine starts.

OK:
Condition Starter Signal
Ignition switch ON OFF
Engine Started ON



Result:
Proceed to
OK
NG



OK

11.READ VALUE USING GTS (ENGINE SPEED)

NG

CHECK STARTER SIGNAL CIRCUIT

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>SFI SYSTEM>Starter Signal Circuit


11.READ VALUE USING GTS (ENGINE SPEED)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine and ECT / Data List / All Data / Engine Speed.

Powertrain > Engine and ECT > Data List
Tester Display
Engine Speed
50003 234 9

e.

Read the values displayed on the GTS while cranking.

OK:

Values are displayed continuously.



Result:
Proceed to
OK
NG



OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>SFI SYSTEM>PROBLEM SYMPTOMS TABLE


NG

CHECK CRANKSHAFT POSITION SENSOR CIRCUIT

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>SFI SYSTEM>P0335