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

8ZR-FXE ENGINE CONTROL  SFI SYSTEM  ECM Power Source Circuit  


DESCRIPTION

When the power switch is turned on (IG), auxiliary battery voltage is applied to the IGSW terminal of the ECM. The output signal from the MREL terminal of the ECM causes current to flow to the coil of the No. 1 integration relay (EFI-MAIN relay), closing the contacts of the EFI-MAIN relay and supplying power to terminals +B and +B2 of the ECM.

WIRING DIAGRAM

A533703E06
0.563,4.844 1.833,5.125 1.271,0.281 10 false Auxiliary Battery 0.375,3.917 1.292,4.167 0.917,0.25 10 false MAIN 1.677,3.458 2.75,3.74 1.073,0.281 10 false EFI-MAIN NO. 1 3.219,4.042 4.333,4.323 1.115,0.281 10 false EFI-MAIN NO. 1 3.438,2.698 4.354,2.948 0.917,0.25 10 false IGP-MAIN 1.854,2.135 2.771,2.385 0.917,0.25 10 false IGP-MAIN 5.292,1.167 7.083,1.625 1.792,0.458 10 false Certification ECU (Smart Key ECU Assembly) 5.292,1 6.365,1.229 1.073,0.229 10 false I197*1 O187*2 5.792,0.479 6.708,0.729 0.917,0.25 10 false IGPD 5.531,0.365 6.448,0.615 0.917,0.25 10 false 24 4.552,2.104 5.656,2.354 1.104,0.25 10 false ECU-IGP NO. 1 4.802,2.552 5.906,2.802 1.104,0.25 10 false EFI NO. 2 5.792,3.625 6.438,3.906 0.646,0.281 10 false MREL 5.573,3.615 5.99,3.917 0.417,0.302 10 false 27 5.823,1.865 6.469,2.146 0.646,0.281 10 false IGP 5.594,1.865 6.24,2.146 0.646,0.281 10 false 41 5.823,2.833 6.469,3.115 0.646,0.281 10 false +B 5.823,3.302 6.469,3.583 0.646,0.281 10 false +B2 5.646,3.188 6.292,3.469 0.646,0.281 10 false 3 5.646,2.729 6.292,3.01 0.646,0.281 10 false 2 5.823,4.229 6.469,4.51 0.646,0.281 10 false E1 5.563,4.156 5.969,4.396 0.406,0.24 10 false 17 6.302,4.677 6.698,4.948 0.396,0.271 10 false ECM 5.969,4.677 6.615,4.958 0.646,0.281 10 false A46 6.354,3.729 6.552,4.031 0.198,0.302 10 false IC 3.26,3.177 3.427,3.375 0.167,0.198 10 false 5 3.26,3.604 3.417,3.802 0.156,0.198 10 false 2 4.802,2.281 4.958,2.479 0.156,0.198 10 false 1 4.083,3.177 4.24,3.375 0.156,0.198 10 false 3 3.26,2.271 3.417,2.469 0.156,0.198 10 false 2 3.26,1.854 3.417,2.052 0.156,0.198 10 false 5 4.083,1.854 4.24,2.052 0.156,0.198 10 false 3 4.083,2.26 4.24,2.458 0.156,0.198 10 false 1 5.156,2.281 5.313,2.479 0.156,0.198 10 false 2 4.083,3.604 4.24,3.802 0.156,0.198 10 false 1 3.833,5.135 5.385,5.375 1.552,0.24 10 false *1: for TFTM made 3.833,5.427 5.385,5.667 1.552,0.24 10 false *2: for GTMC made

CAUTION / NOTICE / HINT

NOTICE:

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


PROCEDURE

1.CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)
a.

Disconnect the ECM connector.


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A46-17 (E1) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

2.CHECK TERMINAL VOLTAGE (IGP TERMINAL VOLTAGE)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

2.CHECK TERMINAL VOLTAGE (IGP TERMINAL VOLTAGE)
a.

Disconnect the ECM connector.


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
A46-41 (IGP) - Body ground Power switch on (IG) 11 to 14 V



Result:
Proceed to
OK
NG



OK

3.INSPECT EFI-MAIN NO. 1 RELAY

NG

6.INSPECT IGP-MAIN RELAY
3.INSPECT EFI-MAIN NO. 1 RELAY

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

Result:
Proceed to
OK
NG



OK

4.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - ECM)

NG

REPLACE EFI-MAIN NO. 1 RELAY

4.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 1 RELAY - ECM)
a.

Remove the EFI-MAIN NO. 1 relay, EFI-MAIN NO.2 relay and EFI-MAIN NO.3 relayfrom the No. 1 engine room relay block and No. 1 junction block assembly.

HINT:

Remove the EFI-MAIN NO. 2 relay and EFI-MAIN NO. 3 relay connected between the checked terminals as the coil inside the relay influences the measurement value.



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
1 (EFI-MAIN NO. 1 relay) - A46-27 (MREL) Always Below 1 Ω
3 (EFI-MAIN NO. 1 relay) - A46-2 (+B) Always Below 1 Ω
3 (EFI-MAIN NO. 1 relay) - A46-3 (+B2) Always Below 1 Ω
1 (EFI-MAIN NO. 1 relay) or A46-27 (MREL) - Body ground and other terminals Always 10 kΩ or higher
3 (EFI-MAIN NO. 1 relay), A46-2 (+B) or A46-3 (+B2) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

5.CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.CHECK TERMINAL VOLTAGE (POWER SOURCE OF EFI-MAIN NO. 1 RELAY)
a.

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


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
5 (EFI-MAIN NO. 1 relay) - Body ground Always 11 to 14 V
2 (EFI-MAIN NO. 1 relay) - Body ground Always 11 to 14 V



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 (AUXILIARY BATTERY - EFI-MAIN NO. 1 RELAY)

6.INSPECT IGP-MAIN RELAY

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

Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (IGP-MAIN RELAY - ECM)

NG

REPLACE IGP-MAIN RELAY

7.CHECK HARNESS AND CONNECTOR (IGP-MAIN RELAY - ECM)
a.

Disconnect the ECM connector.


b.

Remove the IGP-MAIN relay from the No. 1 engine room relay block and No. 1 junction 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 relay) - A46-41 (IGP) Always Below 1 Ω
3 (IGP-MAIN relay) or A46-41 (IGP) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

8.CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGP-MAIN RELAY)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

8.CHECK TERMINAL VOLTAGE (POWER SOURCE OF IGP-MAIN RELAY)
a.

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


b.

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

Standard Voltage:
Tester Connection Condition Specified Condition
5 (IGP-MAIN relay) - Body ground Always 11 to 14 V



Result:
Proceed to
OK
NG



OK

9.CHECK HARNESS AND CONNECTOR (IGP-MAIN RELAY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - IGP-MAIN RELAY)

9.CHECK HARNESS AND CONNECTOR (IGP-MAIN RELAY - BODY GROUND)
a.

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


b.

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

Standard Resistance:
Tester Connection Condition Specified Condition
2 (IGP-MAIN relay) - Body ground Always Below 1 Ω



Result:
Result Proceed to
OK A
NG B



A

10.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IGP-MAIN RELAY)

B

REPAIR OR REPLACE HARNESS OR CONNECTOR

10.CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - IGP-MAIN RELAY)
a.

Disconnect the certification ECU (smart key ECU assembly) connector.


b.

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


c.

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

Standard Resistance (for TFTM made):
Tester Connection Condition Specified Condition
I197-24 (IGPD) - 1 (IGP-MAIN relay) Always Below 1 Ω
I197-24 (IGPD) or 1 (IGP-MAIN relay) - Body ground and other terminals Always 10 kΩ or higher


Standard Resistance (for GTMC made):
Tester Connection Condition Specified Condition
O187-24 (IGPD) - 1 (IGP-MAIN relay) Always Below 1 Ω
O187-24 (IGPD) or 1 (IGP-MAIN relay) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

GO TO SMART KEY SYSTEM

Click hereVehicle Interior>THEFT DETERRENT / KEYLESS ENTRY>SMART ENTRY AND START SYSTEM (for Start Function, HV Model)>HOW TO PROCEED WITH TROUBLESHOOTING


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR