RM3660EC _51 Engine / Hybrid System _080778 8ZR-FXE ENGINE CONTROL _0393982 SFI SYSTEM J

8ZR-FXE ENGINE CONTROL  SFI SYSTEM  Fuel Pump Control Circuit  


DESCRIPTION

When the engine is being cranked, the start request signal output from the hybrid vehicle control ECU is input to the ECM, and the NE signal generated by the crankshaft position sensor is also input to the ECM. Thus, the ECM interprets that the engine is being cranked, and turns an internal transistor on, causing current to flow to the C/OPN relay. The fuel pump then operates the NE signal is input into the ECM with the engine running, the ECM keeps the transistor on.

WIRING DIAGRAM

A531799E09
0.563,4.406 1.115,4.802 0.552,0.396 10 false Auxiliary Battery 0.385,3.302 1.292,3.573 0.906,0.271 10 false MAIN 0.583,2.271 1.802,2.625 1.219,0.354 10 false EFI-MAIN NO. 1 0.75,1 1.458,1.26 0.708,0.26 10 false IGP-MAIN 2.948,1.458 3.865,1.74 0.917,0.281 10 false IGP-MAIN 5.5,0.417 7.031,1.198 1.531,0.781 10 false Certification ECU (Smart Key ECU Assembly) 2.729,2.698 4.021,2.938 1.292,0.24 10 false EFI-MAIN NO. 1 5.906,2.333 6.219,2.531 0.313,0.198 10 false 27 6.135,2.333 6.75,2.531 0.615,0.198 10 false MREL 5.896,4.521 6.208,4.719 0.313,0.198 10 false 29 6.146,4.521 6.458,4.719 0.313,0.198 10 false FC 6.042,5.042 6.5,5.24 0.458,0.198 10 false A46 6.417,5.063 6.875,5.26 0.458,0.198 10 false ECM 3.021,4.344 3.792,4.542 0.771,0.198 10 false C/OPN 2.875,3.979 3.073,4.219 0.198,0.24 10 false 2 3.531,3.958 3.688,4.156 0.156,0.198 10 false 1 2.865,3.646 3.021,3.844 0.156,0.198 10 false 5 3.531,3.635 3.688,3.833 0.156,0.198 10 false 3 1.49,3.948 1.646,4.146 0.156,0.198 10 false 4 1.427,4.198 1.583,4.396 0.156,0.198 10 false B 1.427,4.698 1.594,4.938 0.167,0.24 10 false E 1.469,4.927 1.625,5.125 0.156,0.198 10 false 5 3.667,4.24 5.031,4.521 1.365,0.281 10 false ECU-IGP NO. 1 1.875,4.281 2.292,4.615 0.417,0.333 10 false O44 1.885,4.479 3.198,4.802 1.313,0.323 10 false Fuel Pump 3.552,2.333 3.75,2.573 0.198,0.24 10 false 1 2.844,2.333 3,2.531 0.156,0.198 10 false 2 3.552,1.979 3.708,2.177 0.156,0.198 10 false 3 2.844,1.979 3,2.177 0.156,0.198 10 false 5 3.552,0.74 3.708,0.938 0.156,0.198 10 false 3 2.854,0.76 3.01,0.958 0.156,0.198 10 false 5 2.865,1.083 3.063,1.323 0.198,0.24 10 false 2 3.563,1.094 3.719,1.292 0.156,0.198 10 false 1 6.646,2.375 6.917,2.719 0.271,0.344 10 false IC

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 (ACTIVATE THE CIRCUIT RELAY)
a.

Connect the GTS to the DLC3.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.

Powertrain > Engine > Active Test
Tester Display
Activate the Circuit Relay
50004 372 38

e.

According to the display on the GTS, perform the Active Test and check that fuel pump operating sounds can be heard.

OK:

Operating sounds can be heard from the fuel pump.


Result:
Proceed to
OK
NG




OK

2.READ VALUE USING GTS (ENGINE SPEED)

NG

3.INSPECT RELAY (C/OPN RELAY)
2.READ VALUE USING GTS (ENGINE SPEED)
a.

Connect the GTS to the DLC3.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Put the engine in Inspection Mode (Maintenance Mode).

Powertrain > Hybrid Control > Utility
Tester Display
Inspection Mode
50005 397 2103

e.

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

Powertrain > Engine > Data List
Tester Display
Engine Speed
50003 372 211

f.

Read the values displayed on the GTS while the engine is 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>8ZR-FXE (ENGINE CONTROL)>SFI SYSTEM>PROBLEM SYMPTOMS TABLE


NG

CHECK CRANKSHAFT POSITION SENSOR CIRCUIT

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>SFI SYSTEM>DIAGNOSTIC TROUBLE CODE CHART


3.INSPECT RELAY (C/OPN RELAY)
a.

Inspect the C/OPN relay.

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

4.CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY)

NG

REPLACE RELAY (C/OPN RELAY)

4.CHECK TERMINAL VOLTAGE (POWER SOURCE OF C/OPN RELAY)
a.

Remove the C/OPN relay from the No. 2 relay block assembly.


b.

Turn the power switch on (IG).


c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
1 (C/OPN relay) - Body ground Power switch on (IG) 11 to 14 V
3 (C/OPN relay) - Body ground Power switch on (IG) 11 to 14 V



Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)

NG

9.CHECK HARNESS AND CONNECTOR (IGP-MAIN RELAY - C/OPN RELAY)
5.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - ECM)
a.

Remove the C/OPN relay from the No. 2 relay 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 relay) - A46-29 (FC) Always Below 1 Ω
2 (C/OPN relay) or A46-29 (FC) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

6.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

6.CHECK HARNESS AND CONNECTOR (C/OPN RELAY - FUEL PUMP)
a.

Remove the C/OPN relay from the No. 1 engine room relay block and No. 1 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
5 (C/OPN relay) - O44-4 (B) Always Below 1 Ω
5 (C/OPN relay) or O44-4 (B) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

7.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
O44-5 (E) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

8.INSPECT FUEL PUMP

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

9.CHECK HARNESS AND CONNECTOR (IGP-MAIN RELAY - C/OPN RELAY)
a.

Remove the IGP-MAIN relay from the No. 1 junction block and No. 1 relay block assembly.


b.

Remove the C/OPN relay from the No. 2 relay block assembly.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
3 (IGP-MAIN) - 1 (C/OPN relay) Always Below 1 Ω
3 (IGP-MAIN) or 1 (C/OPN relay) - Body ground and other terminals Always 10 kΩ or higher



HINT:

If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.


Result:
Proceed to
OK
NG



OK

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

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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

Remove the EFI-MAIN NO. 1 relay from the No. 1 junction block and No. 1 relay block assembly.


b.

Remove the C/OPN relay from the No. 2 relay block assembly.


c.

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

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



HINT:

If a short is detected in any of the above circuits, there may be a malfunction in the circuit of a connected ECU.


Result:
Proceed to
OK
NG



OK

GO TO ECM POWER SOURCE CIRCUIT

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>SFI SYSTEM>ECM Power Source Circuit


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR