NETWORKING  CAN COMMUNICATION SYSTEM  ECM Communication Stop Mode  


DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode Either condition is met:
·

"ECM (Engine)" is not displayed on the CAN Bus Check screen of the GTS

Click here(Click here)

·

Communication system DTCs (DTCs that start with U) that correspond to "ECM Communication Stop Mode" in "DTC Combination Table" are output

Click here(Click here)


·

Power source circuit of ECM

·

ECM main line or connector

·

ECM ground circuit

·

ECM



WIRING DIAGRAM

C304928E03
3.292,3.052 3.292,2.01 3.292,2.01 3.448,2.01 false 2.125,4.563 2.125,5.26 2.125,5.26 2.281,5.26 false 0.094,0.115 3.583,0.354 3.49,0.24 12 false V Bus (for 1ZR-FE): 1.281,0.594 5.26,0.792 3.979,0.198 10 false : CAN Main Bus Line (CANH) 1.281,0.948 5.26,1.146 3.979,0.198 10 false : CAN Main Bus Line (CANL) 1.281,1.281 5.26,1.479 3.979,0.198 10 false : CAN Branch Line (CANH) 1.281,1.625 3.104,1.896 1.823,0.271 10 false : CAN Branch Line (CANL) 3.521,1.906 5.552,2.198 2.031,0.292 10 false No. 1 CAN Junction Connector 2.365,5.167 4.396,5.458 2.031,0.292 10 false No. 2 CAN Junction Connector 1.813,2.344 2.604,2.729 0.792,0.385 10 false DLC3 0.271,3.708 1.063,4.094 0.792,0.385 10 false 120 Ω 5.031,3.74 5.823,4.125 0.792,0.385 10 false 120 Ω 0.167,4.552 1.354,5.01 1.188,0.458 10 false Combination Meter Assembly 4.719,4.583 5.573,4.813 0.854,0.229 10 false ECM 4.948,5.021 5.802,5.25 0.854,0.229 10 false Trouble Area 4.365,3.281 5.219,3.51 0.854,0.229 10 false CANH 4.365,4.135 5.219,4.365 0.854,0.229 10 false CANL 4.031,4.021 4.458,4.229 0.427,0.208 10 false A56 4.031,3.385 4.458,3.594 0.427,0.208 10 false A56 5.521,2.99 5.948,3.198 0.427,0.208 10 false A56 5.51,3.385 5.938,3.594 0.427,0.208 10 false A56 5.521,3.938 5.948,4.146 0.427,0.208 10 false A56 5.521,4.354 5.948,4.563 0.427,0.208 10 false B56 4.125,3.208 4.479,3.49 0.354,0.281 10 false 8 4.125,4.219 4.479,4.5 0.354,0.281 10 false 9 5.583,2.813 5.938,3.094 0.354,0.281 10 false 1 5.594,3.219 5.948,3.5 0.354,0.281 10 false 2 5.563,3.771 5.917,4.052 0.354,0.281 10 false 27 5.521,4.188 5.875,4.469 0.354,0.281 10 false 105 5.271,4.365 6.125,4.594 0.854,0.229 10 false E1 5.073,3.958 5.927,4.188 0.854,0.229 10 false IGSW 5.26,3.396 6.115,3.625 0.854,0.229 10 false +B 5.188,3 6.042,3.229 0.854,0.229 10 false +B2 6.188,4.115 6.927,4.51 0.74,0.396 10 false IGN Fuse 6.188,3.146 6.844,3.667 0.656,0.521 10 false EFI NO. 1 Fuse

C302663E04
1.906,4.552 1.906,5.281 1.906,5.281 2.188,5.281 false 3.406,3.052 3.406,1.875 3.406,1.875 3.688,1.875 false 0.125,0.104 3.615,0.344 3.49,0.24 12 false V Bus (for 2ZR-FE): 1.292,0.583 5.271,0.781 3.979,0.198 10 false : CAN Main Bus Line (CANH) 1.292,0.927 5.271,1.125 3.979,0.198 10 false : CAN Main Bus Line (CANL) 1.292,1.271 5.271,1.469 3.979,0.198 10 false : CAN Branch Line (CANH) 1.292,1.604 5.271,1.802 3.979,0.198 10 false : CAN Branch Line (CANL) 1.813,2.354 2.438,2.833 0.625,0.479 10 false DLC3 0.24,3.698 0.865,4.177 0.625,0.479 10 false 120 Ω 0.188,4.563 1.354,5.271 1.167,0.708 10 false Combination Meter Assembly 3.781,1.781 5.771,2.104 1.99,0.323 10 false No. 1 CAN Junction Connector 2.26,5.188 4.25,5.51 1.99,0.323 10 false No. 2 CAN Junction Connector 5.135,5.052 6.073,5.417 0.938,0.365 10 false Trouble Area 4.698,4.563 5.635,4.927 0.938,0.365 10 false ECM 4.083,3.208 4.813,3.552 0.729,0.344 10 false 13 4.083,4.229 4.813,4.573 0.729,0.344 10 false 26 4.042,4.031 4.771,4.375 0.729,0.344 10 false A40 4.042,3.396 4.771,3.74 0.729,0.344 10 false A40 5.51,2.99 6.24,3.333 0.729,0.344 10 false A40 5.521,3.385 6.25,3.729 0.729,0.344 10 false A40 5.521,3.948 6.25,4.292 0.729,0.344 10 false A40 5.51,4.354 6.24,4.698 0.729,0.344 10 false B64 4.385,3.281 5.323,3.646 0.938,0.365 10 false CANH 4.396,4.146 5.333,4.51 0.938,0.365 10 false CANL 5.01,3.74 5.635,4.219 0.625,0.479 10 false 120 Ω 5.552,4.167 6.281,4.51 0.729,0.344 10 false 59 5.573,3.74 6.302,4.083 0.729,0.344 10 false 6 5.594,3.219 6.323,3.563 0.729,0.344 10 false 2 5.604,2.813 6.333,3.156 0.729,0.344 10 false 3 5.188,3 5.917,3.344 0.729,0.344 10 false +B2 5.26,3.385 5.99,3.729 0.729,0.344 10 false +B 5.073,3.948 5.802,4.292 0.729,0.344 10 false IGSW 5.281,4.354 6.01,4.698 0.729,0.344 10 false E1 6.135,3.146 6.813,3.583 0.677,0.438 10 false EFI NO. 1 Fuse 6.167,4.104 6.844,4.365 0.677,0.26 10 false IG2 Relay

C304928E04
3.292,3.052 3.292,2.01 3.292,2.01 3.448,2.01 false 2.125,4.563 2.125,5.26 2.125,5.26 2.281,5.26 false 0.094,0.115 3.583,0.354 3.49,0.24 12 false V Bus (for 2NZ-FE): 1.281,0.594 5.26,0.792 3.979,0.198 10 false : CAN Main Bus Line (CANH) 1.281,0.948 5.26,1.146 3.979,0.198 10 false : CAN Main Bus Line (CANL) 1.281,1.281 5.26,1.479 3.979,0.198 10 false : CAN Branch Line (CANH) 1.281,1.625 3.104,1.896 1.823,0.271 10 false : CAN Branch Line (CANL) 3.521,1.906 5.552,2.198 2.031,0.292 10 false No. 1 CAN Junction Connector 2.365,5.167 4.396,5.458 2.031,0.292 10 false No. 2 CAN Junction Connector 1.813,2.344 2.604,2.729 0.792,0.385 10 false DLC3 0.271,3.708 1.063,4.094 0.792,0.385 10 false 120 Ω 5.031,3.74 5.823,4.125 0.792,0.385 10 false 120 Ω 0.167,4.552 1.354,5.01 1.188,0.458 10 false Combination Meter Assembly 4.719,4.583 5.573,4.813 0.854,0.229 10 false ECM 4.948,5.021 5.802,5.25 0.854,0.229 10 false Trouble Area 4.365,3.281 5.219,3.51 0.854,0.229 10 false CANH 4.365,4.135 5.219,4.365 0.854,0.229 10 false CANL 4.031,4.021 4.458,4.229 0.427,0.208 10 false A56 4.031,3.385 4.458,3.594 0.427,0.208 10 false A56 5.521,2.99 5.948,3.198 0.427,0.208 10 false A56 5.51,3.385 5.938,3.594 0.427,0.208 10 false A56 5.521,3.938 5.948,4.146 0.427,0.208 10 false A56 5.521,4.354 5.948,4.563 0.427,0.208 10 false B56 4.083,3.208 4.438,3.49 0.354,0.281 10 false 41 4.083,4.219 4.438,4.5 0.354,0.281 10 false 49 5.583,2.813 5.938,3.094 0.354,0.281 10 false 1 5.594,3.219 5.948,3.5 0.354,0.281 10 false 2 5.563,3.771 5.917,4.052 0.354,0.281 10 false 28 5.521,4.188 5.875,4.469 0.354,0.281 10 false 104 5.271,4.365 6.125,4.594 0.854,0.229 10 false E1 5.073,3.958 5.927,4.188 0.854,0.229 10 false IGSW 5.26,3.396 6.115,3.625 0.854,0.229 10 false +B 5.188,3 6.042,3.229 0.854,0.229 10 false +B2 6.188,4.094 6.833,4.458 0.646,0.365 10 false IGN Fuse 6.229,3.125 6.885,3.646 0.656,0.521 10 false EFI NO. 1 Fuse

CAUTION / NOTICE / HINT

CAUTION:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.


NOTICE:
·

Before measuring the resistance of the CAN bus, turn the ignition switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

·

After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>PRECAUTION

·

Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>HOW TO PROCEED WITH TROUBLESHOOTING

·

After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

·

DTC check procedure: Turn the ignition switch to ON and wait for 1 minute or more. Then operate the suspected malfunctioning system and drive the vehicle at 60 km/h (37 mph) or more for 5 minutes or more.

·

After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

Click herePower Source / Network>NETWORKING>CAN COMMUNICATION SYSTEM>DIAGNOSIS SYSTEM

·

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



HINT:
·

Operating the ignition switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

·

Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.



PROCEDURE

1.CHECK FOR OPEN IN CAN BUS LINES (ECM MAIN LINE)
a.

Disconnect the cable from the negative (-) battery terminal.


b.

Disconnect the A40 or A56 ECM connector.


c.
C294589C07
1.615,0.104 2.031,0.438 0.417,0.333 1.719,2.177 2.135,2.51 0.417,0.333 2.51,1.104 2.646,0.25 2.646,0.25 2.729,0.25 true 2.802,0.667 2.719,0.667 2.719,0.667 2.51,1.198 true 2.229,3.135 2.552,2.448 2.552,2.448 2.667,2.448 true 2.323,3.135 2.635,2.667 2.635,2.667 2.771,2.667 true 2.667,4.365 2.573,4.365 2.573,4.365 2.5,3.646 true 2.5,3.531 2.635,4.146 2.635,4.146 2.719,4.146 true 0.104,0.094 0.417,0.292 0.313,0.198 10 false *a 1.708,0.156 2.167,0.354 0.458,0.198 10 false A40 2.094,0.156 2.406,0.354 0.313,0.198 10 false *A 2.792,0.156 3.427,0.521 0.635,0.365 10 false CANH*A 2.865,0.573 3.427,0.906 0.563,0.333 10 false CANL*A 2.729,2.354 3.385,2.646 0.656,0.292 10 false CANH*B 2.833,2.573 3.427,2.979 0.594,0.406 10 false CANL*B 1.802,2.24 2.26,2.438 0.458,0.198 10 false A56 2.177,2.24 2.604,2.458 0.427,0.219 10 false *B*C 2.771,4.052 3.427,4.344 0.656,0.292 10 false CANH*C 2.719,4.271 3.333,4.594 0.615,0.323 10 false CANL*C
*A for 2ZR-FE
*B for 1ZR-FE
*C for 2NZ-FE
*a Front view of wire harness connector
(to ECM)


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

Standard Resistance:
for 2ZR-FE
Tester Connection Condition Specified Condition
A40-13 (CANH) - A40-26 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

for 1ZR-FE
Tester Connection Condition Specified Condition
A56-8 (CANH) - A56-9 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω

for 2NZ-FE
Tester Connection Condition Specified Condition
A56-41 (CANH) - A56-49 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω



Result:
Result
OK
NG



OK

2.CHECK ECM POWER SOURCE CIRCUIT

NG

REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (ECM MAIN LINE)

2.CHECK ECM POWER SOURCE CIRCUIT
a.

Check the ECM power source circuit.

·

for 1ZR-FE

Click hereEngine / Hybrid System>1ZR-FE ENGINE CONTROL>SFI SYSTEM>ECM Power Source Circuit

·

for 2ZR-FE

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

·

for 2NZ-FE

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



Result:
Result Proceed to
OK (for 1ZR-FE) A
OK (for 2ZR-FE) B
OK (for 2NZ-FE) C
NG D



A

REPLACE ECM

Click hereEngine / Hybrid System>1ZR-FE ENGINE CONTROL>ECM>REMOVAL


B

REPLACE ECM

Click hereEngine / Hybrid System>2ZR-FE ENGINE CONTROL>ECM>REMOVAL


C

REPLACE ECM

Click hereEngine / Hybrid System>2NZ-FE ENGINE CONTROL>ECM>REMOVAL


D

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)