RM35X0E _57 Power Source / Network _078518 NETWORKING _0381088 CAN COMMUNICATION SYSTEM J

NETWORKING  CAN COMMUNICATION SYSTEM  Urea Pump Control ECU Communication Stop Mode  


DESCRIPTION

Detection Item Symptom Trouble Area
Urea Pump Control ECU Communication Stop Mode Communication stop for "Reductant Control Module" is indicated on the "Communication Bus Check" screen of the GTS.
(Click here)
·

Urea pump control ECU branch wire or connector

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Power source circuit of urea pump control ECU

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Urea pump control ECU ground circuit

·

Urea pump control ECU



WIRING DIAGRAM

C414317
5.833,6.302 6.146,6.5 0.313,0.198 10 false E02 5.823,5.917 6.5,6.115 0.677,0.198 10 false E03 5.542,0.448 5.917,0.656 0.375,0.208 10 false 27 5.51,0.927 5.854,1.125 0.344,0.198 10 false 26 5.552,2.125 5.865,2.323 0.313,0.198 10 false 30 5.542,3.573 5.917,3.917 0.375,0.344 10 false 1 1.604,0.948 1.917,1.146 0.313,0.198 10 false 15 1.625,0.438 1.938,0.635 0.313,0.198 10 false 4 5.5,3.969 5.813,4.167 0.313,0.198 10 false 19 5.521,5.75 5.833,5.948 0.313,0.198 10 false 50 5.521,6.219 5.833,6.417 0.313,0.198 10 false 51 5.521,6.635 5.833,6.833 0.313,0.198 10 false 52 5.792,4.042 6.292,4.26 0.5,0.219 10 false +BU3 5.781,3.708 6.281,3.927 0.5,0.219 10 false +BU4 5.833,3.281 6.333,3.5 0.5,0.219 10 false +BU5 5.771,2.813 6.271,3.031 0.5,0.219 10 false IGSW 5.802,2.24 6.302,2.458 0.5,0.219 10 false BATT 5.792,1.063 6.292,1.281 0.5,0.219 10 false CAN- 5.792,0.563 6.292,0.781 0.5,0.219 10 false CAN+ 1.781,4.5 3.583,4.802 1.802,0.302 10 false from DCU MAIN Relay 5.448,7.333 7.115,7.646 1.667,0.313 10 false Urea Pump Control ECU 0.167,1.396 2.313,1.656 2.146,0.26 10 false No. 7 CAN Junction Connector 0.156,1.198 0.656,1.417 0.5,0.219 10 false N127 5.521,4.385 5.833,4.583 0.313,0.198 10 false 10 5.5,4.802 5.813,5 0.313,0.198 10 false 11 5.833,5.5 6.448,5.729 0.615,0.229 10 false UREL 5.563,5.292 5.875,5.49 0.313,0.198 10 false 9 5.833,6.719 6.146,6.917 0.313,0.198 10 false E01 2.417,5.469 4.25,5.833 1.833,0.365 10 false to DCU MAIN Relay 5.427,7.156 5.906,7.344 0.479,0.188 10 false N37 5.521,2.698 5.833,2.896 0.313,0.198 10 false 18 5.521,3.167 5.833,3.365 0.313,0.198 10 false 2 5.781,4.51 6.281,4.729 0.5,0.219 10 false +BU2 5.75,4.948 6.25,5.167 0.5,0.219 10 false +BU1 4.24,2 5.25,2.24 1.01,0.24 10 false ECU-B NO.3 4.406,2.667 5.417,2.906 1.01,0.24 10 false IG2 NO.1 2.833,2.823 4.5,3.083 1.667,0.26 10 false from Battery 2.833,2.24 4.5,2.5 1.667,0.26 10 false from Battery 3.99,3.51 5,3.75 1.01,0.24 10 false DCU NO.1 3.99,4.333 5,4.573 1.01,0.24 10 false DCU NO.2 4.406,4.76 5.417,5 1.01,0.24 10 false DCU NO.3 2.25,4.917 4.052,5.219 1.802,0.302 10 false from DCU MAIN Relay 1.781,3.667 3.583,3.969 1.802,0.302 10 false from DCU MAIN Relay

CAUTION / NOTICE / HINT

CAUTION:

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


NOTICE:
·

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

·

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

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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 10 minutes 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.

Click hereGeneral>INTRODUCTION>REPAIR INSTRUCTION>PRECAUTION

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When disconnecting and reconnecting the battery.

HINT:

When disconnecting and reconnecting the battery, there is an automatic learning function that completes learning when the respective system is used.

Click hereGeneral>SETUP>WHEN DISCONNECTING OR RECONNECTING BATTERY TERMINAL>AUTOMATIC LEARNING CHART


·

Some parts must be initialized and set when replacing or removing and installing parts.

Click hereGeneral>SETUP>WHEN REPLACING OR REMOVING/INSTALLING PARTS>WORK PROCEDURE

·

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 as normal.

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



HINT:
·

Before disconnecting related connectors for inspection, push in on each connector body to check that the connector is not loose or disconnected.

·

When a connector is disconnected, check that the terminals and connector body are not cracked, deformed or corroded.



PROCEDURE

1.CHECK FOR OPEN IN CAN BUS WIRE (UREA PUMP CONTROL ECU BRANCH WIRE)
a.

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


b.
C407712C03
1.458,0.281 1.958,0.542 0.5,0.26 1.708,0.823 1.875,0.823 1.875,0.823 2.104,1.552 true 2.51,0.823 2.344,0.823 2.344,0.823 2.229,1.542 true 0.104,0.063 0.417,0.26 0.313,0.198 10 false *a 1.573,0.323 1.885,0.521 0.313,0.198 10 false N37 1.292,0.74 1.813,0.938 0.521,0.198 10 false CAN- 2.563,0.74 3.094,0.948 0.531,0.208 10 false CAN+
*a Front view of wire harness connector
(to Urea Pump Control ECU)


Disconnect the N37 urea pump control ECU connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
N37-27 (CAN+) - N37-26 (CAN-) Cable disconnected from negative (-) battery terminal 54 to 69 Ω



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

NG

REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR

2.CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
a.
C407712C04
1.458,0.281 1.958,0.542 0.5,0.26 2.573,3.104 2.406,3.104 2.406,3.104 2.448,1.479 true 2.583,1.583 2.698,2.75 2.698,2.75 2.917,2.75 true 1.323,2.729 1.51,2.729 1.51,2.729 1.531,2.115 true 1.958,2.74 1.76,2.74 1.76,2.74 1.688,2.104 true 0.677,2.635 0.865,2.635 0.865,2.635 1.396,2.052 true 0.656,0.813 0.844,0.813 0.844,0.813 1.427,1.333 true 0.708,0.594 0.896,0.594 0.896,0.594 1.531,1.313 true 2.198,0.177 2.031,0.177 2.031,0.177 2.323,1.333 true 2.438,0.385 2.271,0.385 2.271,0.385 2.458,1.333 true 2.635,0.531 2.469,0.531 2.469,0.531 2.573,1.313 true 2.865,0.74 2.698,0.74 2.698,0.74 2.583,1.438 true 0.104,0.063 0.417,0.26 0.313,0.198 10 false *a 1.573,0.323 1.885,0.521 0.313,0.198 10 false N37 2.615,3.042 3.146,3.25 0.531,0.208 10 false IGSW 2.948,2.667 3.417,2.875 0.469,0.208 10 false BATT 2,2.667 2.469,2.875 0.469,0.208 10 false E01 1.063,2.646 1.531,2.854 0.469,0.208 10 false E02 0.406,2.563 0.875,2.771 0.469,0.208 10 false E03 0.281,0.729 0.75,0.938 0.469,0.208 10 false +BU4 0.302,0.521 0.771,0.729 0.469,0.208 10 false +BU5 2.25,0.094 2.781,0.302 0.531,0.208 10 false UREL 2.469,0.292 3,0.5 0.531,0.208 10 false +BU2 2.698,0.448 3.229,0.656 0.531,0.208 10 false +BU1 2.917,0.656 3.385,0.875 0.469,0.219 10 false +BU3
*a Front view of wire harness connector
(to Urea Pump Control ECU)


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

Standard Resistance:
Tester Connection Condition Specified Condition
N37-52 (E01) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
N37-51 (E02) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω
N37-50 (E03) - Body ground Cable disconnected from negative (-) battery terminal Below 1 Ω



b.

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


c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
N37-30 (BATT) - Body ground Always 11 to 14 V
N37-18 (IGSW) - Body ground Ignition switch ON 11 to 14 V
Ignition switch off Below 1 V
N37-2 (+BU5) - Body ground Battery positive (+) voltage applied to terminal N37-9 (UREL) 11 to 14 V
N37-1 (+BU4) - Body ground 11 to 14 V
N37-19 (+BU3) - Body ground 11 to 14 V
N37-10 (+BU2) - Body ground 11 to 14 V
N37-11 (+BU1) - Body ground 11 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE UREA PUMP CONTROL ECU

Click hereEngine / Hybrid System>1GD-FTV (EMISSION CONTROL)>UREA PUMP CONTROL ECU>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR