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

8ZR-FXE ENGINE CONTROL  SFI SYSTEM  VC Output Circuit  


DESCRIPTION

The ECM constantly generates 5 V power source voltage from the auxiliary battery voltage supplied to the +B, +B2 (BATT) terminal of the ECM to operate the microprocessor. The ECM also provides this power source voltage to the sensors through the VC output circuit.

A531727
1.323,0.823 3.135,1.125 1.813,0.302 10 false from EFI NO. 1 Fuse 0.917,1.177 2.677,1.531 1.76,0.354 10 false from EFI-MAIN NO. 1 Relay 0.604,2.021 2.573,2.448 1.969,0.427 10 false to Throttle Position Sensor, etc. (Sensors which have an IC) 0.135,2.646 2.563,3.031 2.427,0.385 10 false to Engine Coolant Temperature Sensor, Intake Air Temperature Sensor, etc. 5.021,3.083 6.521,3.406 1.5,0.323 10 false ECM 2.885,0.677 3.563,1 0.677,0.323 10 false BATT 2.823,1.042 3.49,1.292 0.667,0.25 10 false +B, +B2 3.063,2.021 3.427,2.25 0.365,0.229 10 false VC 4.396,0.875 6.188,1.229 1.792,0.354 10 false 5 V Constant Voltage Circuit 5.365,1.76 6.354,2.115 0.99,0.354 10 false Microprocessor 4.073,2.844 4.333,3.063 0.26,0.219 10 false R

When the VC circuit has a short circuit, the microprocessor in the ECM and sensors that are supplied power through the VC circuit are deactivated because power is not supplied from the VC circuit. When the system is in this condition, it will not start.

HINT:

Under normal conditions, the MIL is illuminated when the power switch is turned on (IG). The MIL goes off when the power switch is turned on (READY).


WIRING DIAGRAM

·

For the circuit diagram of the ECM power source refer to the ECM power source circuit.

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

·

VC Output Circuit

A531715
0.438,0.875 1.281,1.708 0.844,0.833 10 false Throttle Body Assembly 0.438,0.698 2.667,0.948 2.229,0.25 10 false C20 1.865,0.74 2.208,0.948 0.344,0.208 10 false VC 1.885,1.104 2.229,1.313 0.344,0.208 10 false E2 1.792,1.479 2.135,1.688 0.344,0.208 10 false VTA 1.729,1.833 2.125,2.042 0.396,0.208 10 false VTA2 2.177,0.646 2.479,0.833 0.302,0.188 10 false 5 2.198,1.01 2.5,1.198 0.302,0.188 10 false 3 2.198,1.375 2.5,1.563 0.302,0.188 10 false 6 2.208,1.729 2.51,1.917 0.302,0.188 10 false 4 4.823,0.76 5.26,0.979 0.438,0.219 10 false C155 4.844,7.531 5.177,7.771 0.333,0.24 10 false A46 0.448,2.573 2.677,2.823 2.229,0.25 10 false C10 0.448,2.74 1.573,3.542 1.125,0.802 10 false Camshaft Position Sensor 1.875,2.594 2.219,2.802 0.344,0.208 10 false VC 1.781,2.958 2.125,3.167 0.344,0.208 10 false VVI- 1.76,3.302 2.104,3.51 0.344,0.208 10 false VVI+ 2.208,2.531 2.51,2.719 0.302,0.188 10 false 3 2.219,2.875 2.521,3.063 0.302,0.188 10 false 2 2.219,3.208 2.521,3.396 0.302,0.188 10 false 1 4.865,0.563 5.167,0.75 0.302,0.188 10 false 134 4.854,0.938 5.156,1.125 0.302,0.188 10 false 133 4.865,1.292 5.167,1.479 0.302,0.188 10 false 135 4.875,1.656 5.177,1.844 0.302,0.188 10 false 101 5.208,0.615 5.604,0.833 0.396,0.219 10 false VCTA 5.208,0.979 5.604,1.198 0.396,0.219 10 false ETA 5.208,1.49 5.604,1.708 0.396,0.219 10 false VTA1 5.188,1.844 5.583,2.063 0.396,0.219 10 false VTA2 4.865,2.427 5.167,2.615 0.302,0.188 10 false 114 5.208,2.521 5.604,2.74 0.396,0.219 10 false VCV1 5.208,2.875 5.604,3.094 0.396,0.219 10 false VV1- 5.208,3.344 5.604,3.563 0.396,0.219 10 false VV1+ 4.875,2.802 5.177,2.99 0.302,0.188 10 false 113 4.875,3.167 5.177,3.354 0.302,0.188 10 false 110 0.438,4.104 2.667,4.354 2.229,0.25 10 false C150 0.448,4.271 1.563,5.073 1.115,0.802 10 false Manifold Absolute Pressure Sensor 1.885,4.115 2.229,4.323 0.344,0.208 10 false VC 1.906,4.438 2.25,4.646 0.344,0.208 10 false E2 1.833,4.823 2.177,5.031 0.344,0.208 10 false PIM 2.198,4 2.5,4.188 0.302,0.188 10 false 3 2.198,4.365 2.5,4.552 0.302,0.188 10 false 1 2.208,4.729 2.51,4.917 0.302,0.188 10 false 2 4.906,3.938 5.208,4.125 0.302,0.188 10 false 89 4.906,4.302 5.208,4.49 0.302,0.188 10 false 88 4.906,4.667 5.208,4.854 0.302,0.188 10 false 87 5.198,4.01 5.688,4.198 0.49,0.188 10 false VCPM 5.198,4.385 5.688,4.573 0.49,0.188 10 false EPIM 5.188,4.833 5.677,5.021 0.49,0.188 10 false PIM 0.427,7.146 2.656,7.396 2.229,0.25 10 false O133 0.417,7.313 1.344,8.063 0.927,0.75 10 false Canister Pump Module 1.771,7.177 2.115,7.385 0.344,0.208 10 false VCC 1.688,7.531 2.146,7.781 0.458,0.25 10 false SGND 1.698,7.906 2.146,8.146 0.448,0.24 10 false VOUT 2.177,7.063 2.479,7.25 0.302,0.188 10 false 6 2.177,7.427 2.479,7.615 0.302,0.188 10 false 8 2.188,7.792 2.49,7.979 0.302,0.188 10 false 7 4.896,6.99 5.177,7.156 0.281,0.167 10 false 56 4.896,7.344 5.177,7.51 0.281,0.167 10 false 55 4.896,7.729 5.177,7.896 0.281,0.167 10 false 40 5.208,7.073 5.854,7.26 0.646,0.188 10 false VCPP 5.198,7.427 5.958,7.646 0.76,0.219 10 false EPPM 5.198,7.885 5.938,8.083 0.74,0.198 10 false PPMP 5.708,8.344 6.198,8.531 0.49,0.188 10 false ECM 6.208,0.542 6.49,0.74 0.281,0.198 10 false 5 V 0.406,5.708 2.635,5.958 2.229,0.25 10 false O178 0.406,5.896 1.625,6.74 1.219,0.844 10 false Fuel Tank Pressure Sensor 1.854,5.656 2.198,5.865 0.344,0.208 10 false VC 1.875,6.031 2.219,6.24 0.344,0.208 10 false E2 1.688,6.385 2.417,6.74 0.729,0.354 10 false PTNK 2.177,5.563 2.948,5.75 0.771,0.188 10 false 1 2.177,6.271 2.781,6.479 0.604,0.208 10 false 3 2.177,5.917 2.917,6.094 0.74,0.177 10 false 2 4.896,5.479 5.198,5.667 0.302,0.188 10 false 54 4.896,6.208 5.198,6.396 0.302,0.188 10 false 38 4.885,5.844 5.188,6.031 0.302,0.188 10 false 53 5.208,5.552 5.844,5.74 0.635,0.188 10 false VPTK 5.198,6.375 5.813,6.573 0.615,0.198 10 false PTNK 5.208,5.917 5.823,6.104 0.615,0.188 10 false EPTK 4.823,1.125 5.271,1.365 0.448,0.24 10 false C155 4.823,1.49 5.281,1.677 0.458,0.188 10 false C155 4.823,1.854 5.344,2.031 0.521,0.177 10 false C155 4.833,2.604 5.26,2.823 0.427,0.219 10 false C155 4.823,2.969 5.271,3.198 0.448,0.229 10 false C155 4.823,3.333 5.302,3.563 0.479,0.229 10 false C155 4.823,4.115 5.25,4.354 0.427,0.24 10 false C155 4.823,4.479 5.281,4.698 0.458,0.219 10 false C155 4.823,4.844 5.344,5.115 0.521,0.271 10 false C155 4.844,5.656 5.333,5.854 0.49,0.198 10 false A46 4.844,6.031 5.354,6.26 0.51,0.229 10 false A46 4.844,6.385 5.333,6.604 0.49,0.219 10 false A46 4.844,7.167 5.177,7.406 0.333,0.24 10 false A46 4.854,7.896 5.188,8.135 0.333,0.24 10 false A46

A546088
0.51,0.854 1.906,1.427 1.396,0.573 10 false Mass Air Flow Meter Sub-assembly 0.51,0.656 0.969,0.854 0.458,0.198 10 false C26 1.885,0.677 2.344,0.875 0.458,0.198 10 false VCC 1.896,1.052 2.354,1.25 0.458,0.198 10 false E2G 1.958,1.406 2.271,1.604 0.313,0.198 10 false FG 1.906,1.75 2.365,1.948 0.458,0.198 10 false THA 4.927,0.677 5.542,0.875 0.615,0.198 9 false C155 4.917,1.052 5.531,1.25 0.615,0.198 9 false C155 4.917,1.406 5.531,1.604 0.615,0.198 9 false C155 4.917,1.76 5.531,1.958 0.615,0.198 9 false C155 4.917,2.531 5.531,2.729 0.615,0.198 9 false C155 4.917,2.896 5.531,3.094 0.615,0.198 9 false C155 4.917,3.26 5.531,3.458 0.615,0.198 9 false C155 4.917,4.031 5.469,4.208 0.552,0.177 9 false C155 4.917,4.396 5.469,4.573 0.552,0.177 9 false C155 4.917,4.75 5.469,4.927 0.552,0.177 9 false C155 0.521,2.688 1.844,3.104 1.323,0.417 10 false Crankshaft Position Sensor 0.531,2.49 0.99,2.688 0.458,0.198 10 false C13 1.969,2.51 2.313,2.719 0.344,0.208 10 false VC 1.938,2.875 2.396,3.073 0.458,0.198 10 false NE- 1.906,3.25 2.365,3.448 0.458,0.198 10 false NE+ 2.292,2.417 2.448,2.615 0.156,0.198 10 false 1 2.281,2.75 2.438,2.948 0.156,0.198 10 false 2 2.281,3.146 2.438,3.344 0.156,0.198 10 false 3 4.99,2.333 5.302,2.531 0.313,0.198 10 false 82 5,2.719 5.313,2.917 0.313,0.198 10 false 81 5,3.083 5.313,3.281 0.313,0.198 10 false 80 5.271,2.427 5.885,2.625 0.615,0.198 10 false VCNE 5.281,2.781 5.594,2.979 0.313,0.198 10 false NE- 5.292,3.24 6.063,3.438 0.771,0.198 10 false NE+ 5.281,0.573 5.896,0.771 0.615,0.198 10 false VCVG 5.292,0.938 5.75,1.135 0.458,0.198 10 false E2G 5.292,1.396 5.604,1.594 0.313,0.198 10 false VG 5.292,1.76 5.75,1.958 0.458,0.198 10 false THA 4.948,0.479 5.406,0.677 0.458,0.198 10 false 108 4.958,0.854 5.417,1.052 0.458,0.198 10 false 107 4.969,1.229 5.427,1.427 0.458,0.198 10 false 140 4.969,1.594 5.427,1.792 0.458,0.198 10 false 139 0.51,4.021 1.125,4.219 0.615,0.198 10 false C152 0.51,4.219 1.906,4.646 1.396,0.427 10 false Differential Pressure Sensor 1.979,4.021 2.292,4.219 0.313,0.198 10 false VC 2,4.396 2.313,4.594 0.313,0.198 10 false E2 1.906,4.75 2.365,4.948 0.458,0.198 10 false PEX 2.271,3.927 2.427,4.125 0.156,0.198 10 false 3 2.26,4.26 2.417,4.458 0.156,0.198 10 false 1 2.26,4.635 2.417,4.833 0.156,0.198 10 false 2 4.958,3.833 5.417,4.031 0.458,0.198 10 false 122 4.979,4.219 5.438,4.417 0.458,0.198 10 false 121 5.01,4.573 5.323,4.771 0.313,0.198 10 false 90 5.281,3.917 5.896,4.115 0.615,0.198 10 false VCPX 5.281,4.292 5.896,4.49 0.615,0.198 10 false EPEX 5.281,4.74 5.74,4.938 0.458,0.198 10 false PEX 2.292,0.552 2.448,0.75 0.156,0.198 10 false 4 2.281,0.906 2.438,1.104 0.156,0.198 10 false 2 2.281,1.292 2.438,1.49 0.156,0.198 10 false 3 2.271,1.667 2.427,1.865 0.156,0.198 10 false 1


CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.CHECK GTS
a.

Connect the GTS to the DLC3.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.



Result:
Result Proceed to
Communication is not possible A
Communication is possible B



A

2.CHECK EFI NO. 2 FUSE VOLTAGE

B

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>SFI SYSTEM>PROBLEM SYMPTOMS TABLE


2.CHECK EFI NO. 2 FUSE VOLTAGE
A533563C01
2.667,2.24 2.958,1.063 true 0.604,2.01 0.917,2.167 0.313,0.156 10 false *1 2.99,0.958 3.302,1.115 0.313,0.156 10 false *2
*1 No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly
*2 EFI NO. 2 Fuse


a.

Turn the power switch on (IG).


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
1 (EFI NO. 2 fuse) - Body ground Power switch on (IG) 11 to 14 V


HINT:
·

Check the fuse with it installed to the No. 1 engine room relay block and No. 1 junction block assembly.

·

If the result is not as specified, since current is not flowing to the +B and +B2 terminals of the ECM, the system may not be started.




Result:
Proceed to
OK
NG



OK

3.CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR)

NG

GO TO ECM POWER SOURCE CIRCUIT

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


3.CHECK CONNECTION BETWEEN GTS AND ECM (THROTTLE POSITION SENSOR)
a.

Disconnect the throttle body assembly connector.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.



Result:
Result Proceed to
Communication is not possible A
Communication is possible B


HINT:

Perform "Inspection After Repair" after replacing the throttle body assembly.

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



A

4.CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR)

B

REPLACE THROTTLE BODY ASSEMBLY

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>THROTTLE BODY>REMOVAL


4.CHECK CONNECTION BETWEEN GTS AND ECM (CAMSHAFT POSITION SENSOR)
a.

Disconnect the camshaft position sensor connector.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.



Result:
Result Proceed to
Communication is not possible A
Communication is possible B



A

5.CHECK CONNECTION BETWEEN GTS AND ECM (MANIFOLD ABSOLUTE PRESSURE SENSOR)

B

REPLACE CAMSHAFT POSITION SENSOR

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>CAMSHAFT POSITION SENSOR>REMOVAL


5.CHECK CONNECTION BETWEEN GTS AND ECM (MANIFOLD ABSOLUTE PRESSURE SENSOR)
a.

Disconnect the manifold absolute pressure sensor connector.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.



Result:
Result Proceed to
Communication is not possible A
Communication is possible B



A

6.CHECK CONNECTION BETWEEN GTS AND ECM (CANISTER PUMP MODULE)

B

REPLACE MANIFOLD ABSOLUTE PRESSURE SENSOR

Click hereEngine / Hybrid System>8ZR-FXE (EMISSION CONTROL)>VACUUM SENSOR>REMOVAL


6.CHECK CONNECTION BETWEEN GTS AND ECM (CANISTER PUMP MODULE)
a.

Disconnect the canister pump module connector.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.



Result:
Result Proceed to
Communication is not possible A
Communication is possible B



A

7.CHECK CONNECTION BETWEEN GTS AND ECM (FUEL TANK PRESSURE SENSOR)

B

REPLACE CANISTER PUMP MODULE

Click hereEngine / Hybrid System>8ZR-FXE (EMISSION CONTROL)>CANISTER>REMOVAL


7.CHECK CONNECTION BETWEEN GTS AND ECM (FUEL TANK PRESSURE SENSOR)
a.

Disconnect the fuel tank pressure sensor connector.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Check the communication between the GTS and ECM.

HINT:

Communication can be checked by using the Data List item Engine.



Result:
Result Proceed to
Communication is not possible A
Communication is possible B



A

8.CHECK CONNECTION BETWEEN TECHSTREAM AND ECM (CRANKSHAFT POSITION SENSOR)

B

REPLACE FUEL TANK PRESSURE SENSOR

Click hereEngine / Hybrid System>8ZR-FXE (EMISSION CONTROL)>FUEL TANK PRESSURE SENSOR>REMOVAL


8.CHECK CONNECTION BETWEEN TECHSTREAM AND ECM (CRANKSHAFT POSITION SENSOR)
a.

Disconnect the crankshaft position sensor connector.


b.

Turn the power switch on (IG).


c.

Turn the Techstream on.


d.

Check the communication between the Techstream and ECM.

HINT:

Communication can be checked by using the Data List item Engine.



Result:
Result Proceed to
Communication is not possible A
Communication is possible B



A

9.CHECK CONNECTION BETWEEN TECHSTREAM AND ECM (MASS AIR FLOW METER SUB-ASSEMBLY)

B

REPLACE CRANKSHAFT POSITION SENSOR

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>CRANKSHAFT POSITION SENSOR>REMOVAL


9.CHECK CONNECTION BETWEEN TECHSTREAM AND ECM (MASS AIR FLOW METER SUB-ASSEMBLY)
a.

Disconnect the mass air flow meter sub-assembly connector.


b.

Turn the power switch on (IG).


c.

Turn the Techstream on.


d.

Check the communication between the Techstream and ECM.

HINT:

Communication can be checked by using the Data List item Engine.



Result:
Result Proceed to
Communication is not possible A
Communication is possible B


HINT:

Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



A

10.CHECK CONNECTION BETWEEN GTS AND ECM (DIFFERENTIAL PRESSURE SENSOR)

B

REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>MASS AIR FLOW METER>REMOVAL


10.CHECK CONNECTION BETWEEN GTS AND ECM (DIFFERENTIAL PRESSURE SENSOR)
a.

Disconnect the differential pressure sensor connector.


b.

Turn the power switch on (IG).


c.

Turn the GTS on.


d.

Check the communication between the GTS and ECM.

HINT:

It can be checked using the "Engine" item of the Data List.


Result:
Result Proceed to
Communication is not possible A
Communication is possible B




A

11.CHECK HARNESS AND CONNECTOR

B

REPLACE DIFFERENTIAL PRESSURE SENSOR

Click hereEngine / Hybrid System>8ZR-FXE (EMISSION CONTROL)>DIFFERENTIAL PRESSURE SENSOR>REMOVAL


11.CHECK HARNESS AND CONNECTOR
a.

Disconnect the throttle body assembly connector.


b.

Disconnect the crankshaft position sensor connector.


c.

Disconnect the manifold absolute pressure sensor connector.


d.

Disconnect the canister pump module connector.


e.

Disconnect the fuel tank pressure sensor connector.


f.

Disconnect the ECM connectors.


g.

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

Standard Resistance:
Tester Connection Condition Specified Condition
C155-134 (VCTA) - Body ground Always 10 kΩ or higher
C155-114 (VCV1) - Body ground Always 10 kΩ or higher
C155-89 (VCPM) - Body ground Always 10 kΩ or higher
A46-56 (VCPP) - Body ground Always 10 kΩ or higher
A46-54 (VPTK) - Body ground Always 10 kΩ or higher
C155-108 (VCVG) - Body ground Always 10 kΩ or higher
C155-82 (VCNE) - Body ground Always 10 kΩ or higher
C155-122 (VCPX) - Body ground Always 10 kΩ or higher
A46-2 (+B) - 1 (EFI NO. 2 fuse) Always Below 1 Ω
A46-3 (+B2) - 1 (EFI NO. 2 fuse) Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>8ZR-FXE (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR