NETWORKING  CAN COMMUNICATION SYSTEM  Power Steering ECU Communication Stop Mode  


DESCRIPTION

Detection Item Symptom Trouble Area
Power Steering ECU Communication Stop Mode Either condition is met:
·

"Power Steering (EPS)" is not displayed on the CAN Bus Check screen of the GTS

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·

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

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·

Power steering ECU assembly branch line or connector

·

Power source circuit of power steering ECU assembly

·

Power steering ECU assembly ground circuit

·

Power steering ECU assembly



WIRING DIAGRAM

C290862E07
2.656,1.281 2.521,0.76 2.521,0.76 2.438,0.76 false 3.74,1.281 3.49,0.302 3.49,0.302 3.417,0.302 false 0.073,0.073 1.177,0.313 1.104,0.24 12 false V Bus: 4.615,0.542 5.229,0.74 0.615,0.198 10 false DLC3 1.458,0.198 5.74,0.396 4.281,0.198 10 false No. 2 CAN Junction Connector 0.469,0.656 4.75,0.854 4.281,0.198 10 false No. 1 CAN Junction Connector 0.698,2.188 1.469,2.385 0.771,0.198 10 false 120 Ω 6.146,2.188 6.917,2.385 0.771,0.198 10 false 120 Ω 0.604,2.813 1.063,3.01 0.458,0.198 10 false ECM 5.802,2.802 7,3.531 1.198,0.729 10 false Combination Meter Assembly 4.156,3.156 4.615,3.354 0.458,0.198 10 false E40 3.76,3.156 4.219,3.354 0.458,0.198 10 false E40 3.146,3.708 3.604,3.906 0.458,0.198 10 false E40 4.844,3.719 5.302,3.917 0.458,0.198 10 false A25 3.75,2.958 3.906,3.156 0.156,0.198 10 false 7 4.333,2.958 4.49,3.156 0.156,0.198 10 false 8 3.323,3.49 3.479,3.688 0.156,0.198 10 false 1 4.813,3.521 4.969,3.719 0.156,0.198 10 false 2 3.604,3.354 4.219,3.552 0.615,0.198 10 false CANH 4.125,3.354 4.74,3.552 0.615,0.198 10 false CANL 3.51,3.708 3.823,3.906 0.313,0.198 10 false IG 4.344,3.708 4.958,3.906 0.615,0.198 10 false PGND 5.615,3.844 6.667,4.354 1.052,0.51 10 false Trouble Area 3.052,4.333 6.094,4.875 3.042,0.542 10 false Power Steering ECU Assembly 2.229,3.885 3.385,4.188 1.156,0.302 10 false ECU-IG NO. 5 1.438,4.99 5.417,5.188 3.979,0.198 10 false : CAN Main Bus Line (CANH) 1.438,5.396 5.417,5.594 3.979,0.198 10 false : CAN Main Bus Line (CANL) 4.406,4.99 6.469,5.385 2.063,0.396 10 false : CAN Branch Line (CANH) 4.396,5.396 6.208,5.688 1.813,0.292 10 false : CAN Branch Line (CANL)

CAUTION / NOTICE / HINT

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 at least 5.34 seconds, and then drive the vehicle at a speed of 20 km/h (12 mph) or more for 300 seconds 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 (POWER STEERING ECU ASSEMBLY BRANCH LINE)
a.

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


b.

Disconnect the E40 power steering ECU assembly connector.


c.
C289282C08
0.583,1.729 1,2.01 0.417,0.281 1.354,2.896 1.5,2.896 1.5,2.896 1.781,2.333 true 2.302,2.906 2.167,2.906 2.167,2.906 1.948,2.333 true 0.073,0.094 0.385,0.292 0.313,0.198 10 false *a 0.667,1.76 0.979,1.958 0.313,0.198 10 false E40 0.927,2.792 1.542,2.99 0.615,0.198 10 false CANH 2.365,2.813 2.979,3.01 0.615,0.198 10 false CANL
*a Front view of wire harness connector
(to Power Steering ECU Assembly)


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

Standard Resistance:
Tester Connection Condition Specified Condition
E40-7 (CANH) - E40-8 (CANL) Cable disconnected from negative (-) battery terminal 54 to 69 Ω



Result:
Result
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

NG

REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (POWER STEERING ECU ASSEMBLY)

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.

Disconnect the A25 power steering ECU assembly connector.


b.
C289274C05
1.51,0.167 1.938,0.458 0.427,0.292 2.073,1.26 2.469,1.865 2.469,1.865 2.604,1.865 true 0.073,0.063 0.385,0.26 0.313,0.198 10 false *a 1.604,0.208 1.917,0.406 0.313,0.198 10 false A25 2.656,1.771 3.271,1.969 0.615,0.198 10 false PGND
*a Front view of wire harness connector
(to Power Steering ECU Assembly)


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

Standard Resistance:
Tester Connection Condition Specified Condition
A25-2 (PGND) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω



c.

Reconnect the cable to the negative (-) battery terminal.


d.
C289282C09
0.583,1.729 1,2.01 0.417,0.281 1.01,2.667 1.156,2.667 1.156,2.667 1.438,2.104 true 0.073,0.094 0.385,0.292 0.313,0.198 10 false *a 0.667,1.76 0.979,1.958 0.313,0.198 10 false E40 0.823,2.563 1.438,2.76 0.615,0.198 10 false IG
*a Front view of wire harness connector
(to Power Steering ECU Assembly)


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

Standard Voltage:
Tester Connection Condition Specified Condition
E40-1 (IG) - Body ground Ignition switch ON 11 to 14 V



Result:
Result
OK
NG



OK

REPLACE POWER STEERING ECU ASSEMBLY

Click hereSteering>POWER ASSIST SYSTEMS>POWER STEERING ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT)