Data Link - Test

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Ser vice Infor mation System

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Troubleshooting C175-16 and C175-20 Engines for Off-Highway Truck/Tractors Me dia Num be r -KENR 5398-16

Publica t ion Dat e -01/12/2014

Da t e Upda t ed -18/08/2016

i04901063

Data Link - Test SMCS - 1900-038

Use this procedure to troubleshoot a suspected problem with the CAN data link or the Cat Data Link. Also, use this procedure if one of the diagnostic codes in Table 1 are active or easily repeated. Table 1 Diagnostic Codes Table Description

Conditions which Generate this Code

System Response

The Engine Control Module (ECM) has lost all communications over the global CAN data link.

The code is logged. The check engine lamp is illuminated.

The ECM has lost all communications to the transmission control module over the Cat Data Link.


The ECM has lost partial communications to the transmission control module over the Cat Data Link.


533-9 Brake Control : Abnormal Update Rate

The ECM has lost all communications to the brake control over the Cat Data Link.


533-1 533-14 4 Brak Brakee Cont Contro roll : Speci Special al

The ECM ECM has lost lost part partia iall comm communi unicat catio ions ns to the the

247-9 SAE J1939 Data Link : Abnormal Update Rate

296-9 Transmission Control : Abnormal Update Rate

296-14 Transmission Control : Special Instruction

The The code code is logged.

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Ser vice Infor mation System

Instruction

1273-9 Chassis Control Module : Abnormal Update Rate

1273-14 Chassis Control Module : Special Instruction

2348-9 SAE J1939 Data Link #2 : Abnormal Update Rate

2854-9 Coolant Temperature Control Module : Abnormal Update Rate

brake control over the Cat Data Link.

The check engine lamp is illuminated.

The ECM has lost all communications to the chassis control module over the Cat Data Link.


The ECM has lost partial communications to the chassis control module over the Cat Data Link.


The ECM has lost all communications over the local CAN data link.


The ECM has lost all communications to the temperature control module over the global CAN data link.


The CAN data link is used to communicate information between the master ECM and other control modules that are on the engine. Use this procedure to troubleshoot any suspect problems with the CAN data link. This procedure verifies the integrity of the Cat Data Link between the following components: Advisor monitor display Brake ECM Chassis ECM Engine ECM Service tool connector Transmission ECM The control modules for the Vital Information Management System (VIMS) This procedure verifies the integrity of the CAN data link between the following components: Advisor monitor display Brake ECM Chassis ECM Engine ECM https://sis.cat.com /sisweb/sis /sis web/sisweb/techdoc/te web/techdoc/techdoc_print_page chdoc_print_page.jsp?r .jsp?returnurl eturnurl=/si =/si sweb/sisweb/medi sweb/si sweb/mediasearch/cmedi asearch/cmediahea aheaderinfofram derinfofram eset.jsp&call edpage=/si edpage=/sisweb… sweb… 2/20

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Service Information System

Fuel control valve Machine Security System (MSS) Temperature control module The control modules for the Vital Information Management System (VIMS) Transmission ECM Service tool connector

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Illustration 1


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Location of the service tool connector that is in the cab of the truck (typical location) https://sis.cat.com /sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/si sweb/sisweb/mediasearch/cmediaheaderinfoframeset.jsp&call edpage=/sisweb… 4/20

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If Caterpillar Electronic Technician (ET) will not communicate with the ECM, refer to Troubleshooting, "Electronic Service Tool Does Not Communicate" before you begin this procedure. The procedure verifies that electrical power is being supplied to the engine ECM and to the service tool connector. The data links provide a communication link between the various control modules on the application. Cat ET may display the following error message: "The version of the ECM is not recognized and the integrity of the changed parameters and displayed data is not guaranteed." If this message is displayed, the flash file in the ECM may be newer than the version of Cat ET. Ensure that the latest version of Cat ET has been installed. Correct this condition prior to continuing with this procedure.

Illustration 2

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Schematic for the Cat Data Link


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Illustration 3


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Schematic for the CAN data link


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Illustration 4


g01444857

Location of the connectors at the ECM for the 16 cylinder engines (typical left side engine v iew) (1) J2/P2 ECM connector (2) Right rail connectors (3) Left rail connectors (4) J1/P1 ECM connector


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Illustration 5

g01444860

Location of the connectors at the ECM for the 20 cylinder engines (typical left side engine v iew) (1) J2/P2 ECM connector (2) Right rail connectors (3) Left rail connectors (4) J1/P1 ECM connector

Illustration 6

g01444865

Location of the machine interface connectors (left rear engine view) https://sis.cat.com /sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/si sweb/sisweb/mediasearch/cmediaheaderinfoframeset.jsp&call edpage=/sisweb… 8/20

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(5) Machine interface connectors

Illustration 7

g01444702

Terminal locations at the service tool connector (A) +Battery (B) −Battery (C) CAN shield (D) Cat Data Link + (E) Cat Data Link − (F) CAN data link − (G) CAN data link +


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Illustration 8

g01444732

Terminal locations at the P1 ECM connector that are for the data link (P1-8) Cat Data Link + (P1-9) Cat Data Link − (P1-34) CAN data link − (P1-42) CAN shield (P1-48) +Battery (P1-50) CAN data link + (P1-52) +Battery (P1-53) +Battery (P1-55) +Battery (P1-57) +Battery https://sis.cat.com /sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/si sweb/sisweb/mediasearch/cmediaheaderinfoframeset.jsp&call edpage=/siswe… 10/20

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(P1-61) −Battery (P1-63) −Battery (P1-65) −Battery (P1-67) −Battery (P1-69) −Battery (P1-70) Keyswitch

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Illustration 9

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Terminal locations at the P2 ECM connector that are for the data link (P2-11) Local CAN data link − https://sis.cat.com /sisweb/sisweb/techdoc/techdoc_print_page.jsp?returnurl=/si sweb/sisweb/mediasearch/cmediaheaderinfoframeset.jsp&call edpage=/siswe… 12/20

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(P2-12) Local CAN data link + (P2-23) Local CAN shield (P2-34) Global CAN data link − (P2-42) Global CAN shield (P2-50) Global CAN data link +

Illustration 10

g01444779

Terminal locations at the left rail connector that are for the data link (Terminal 48) Cat Data Link + (Terminal 49) Cat Data Link − (Terminal 5 8) CAN shield (Terminal 60) CAN data link − (Terminal 61) CAN data link +


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Illustration 11

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Terminal locations at the right rail connector that are for the data link (Terminal 8) CAN shield (Terminal 10) CAN data link − (Terminal 11) CAN data link +


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Illustration 12


g01444812

Terminal locations at the machine interface connector that are for the data link (Terminal 13) Cat Data Link + (Terminal 14) Cat Data Link − (Terminal 3 8) CAN shield (Terminal 35) CAN data link − (Terminal 36) CAN data link +


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Illustration 13

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Terminal locations at the connector for the fuel control valve that are for the data link (Terminal 4) CAN data link + (Terminal 6) CAN data link −

Illustration 14

g01444823

Terminal locations at the connector for the temperature control module that are for the data link (Terminal 4) CAN data link + (Terminal 6) CAN data link − (Terminal 9) CAN shield

Table 2 Troubleshooting Test Steps

Values

1. Inspect the Electrical Connectors and the Wiring

Connectors

Results Results: The wiring and the connectors appear to be OK.


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Proceed to Test Step 2

Note: Carefully follow this procedure in order to identify an intermittent problem.

Results: There is a problem with the wiring or with a connector.

A. Perform a visual inspection of the wiring between the P1 and P2 ECM connectors, the termination resistors, the service tool connector, all of the control box connectors, and the connectors at various controllers.

Repair Repair the connectors or wiring and/or replace the connectors or wiring. Ensure that all of the connector seals are properly in place and ensure that the connectors are coupled. Verify that the problem is resolved.

- Look for these problems: - Harness damage that is caused by chafing - Harness damage that is caused by excessive heat - Look for moisture on the wiring and in the connectors. - Pull on the wires that are associated with the data links. This test verifies that the wire is properly crimped to the terminal and that the terminal is properly inserted into the connector.

2. Bypass the Wiring for the Data Link A. Connect the 217-0113 Wiring Harness (ECM BYPASS) to the J1 connector, to the 332-7381 Data Link Cable As, and to the battery. B. Try to establish communication between Cat ET and the ECM.

Data link

Results: Cat ET and the ECM communicate. Repair Cat ET and the ECM communicate when the bypass harness is installed. However, communication cannot be established via the engine wiring.

Disconnect the electrical connector from each of the control modules that is on the data link one at a time. This test will isolate the problem. Try to establish communication between Cat ET and the ECM after disconnecting each module. The problem is in the control module if disconnecting the module allows Cat ET and the ECM to communicate. If a module is suspect, replace the module. Verify that the problem is resolved. The control module is OK if the problem remains when the module is disconnected. Results: ET and the ECM do not communicate. Repair Communication between Cat ET and the ECM is not established when the bypass harness is installed. Temporarily connect a test ECM. Refer to


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Troubleshooting, "Test ECM Mode". Verify that the problem is resolved. Connect the original ECM and verify that the problem returns. Before you consider permanently replacing the ECM, consult with your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

3. Check the Wiring for the Data Links for a Short Circuit A. Turn the keyswitch OFF position. B. Disconnect the negative cable from the battery.

Results: Each measurement indicates an open circuit. The wiring for the data links does not have a short circuit.

C. Disconnect the P1 and P2 ECM connectors.

Proceed to Test Step 4. D. Measure the resistance between the following terminals: - P1-8 (Cat Data Link +) and P1-61 (Battery) - P1-9 (Cat Data Link -) and P1-61 (Battery) - P1-34 (Global CAN data link -) and P1-61 (-Battery) - P1-50 (Global CAN data link +) and P1-61 (-Battery) - P2-11 (Local CAN data link -) and P1-61 (-Battery) - P2-12 (Local CAN data link +) and P1-61 (-Battery)

4. Check the Wiring for the Data Links for an Open Circuit A. Connect a jumper wire between terminals P1-8 and P1-9 at the primary ECM. B. At the service tool connector and the connector for each control module, measure the resistance between the terminals for the Cat Data Link. C. Connect a jumper wire between

Short Circuit

Results: At least one measurement does not indicate an open circuit. Repair: At least one measurement is less than five Ohms. The wiring for a data link has a short circuit. Determine the cause of the short circuit. Repair the problem, when possible. Replace parts, if necessary. Verify that the problem is resolved.

Open circuit

Results: All of the resistance measurements indicate a short circuit. Repair: If you are troubleshooting the Cat Data Link, the data link appears to be OK. The problem is probably an intermittent problem in a connector or in the harness. If the problem persists, perform this test procedure again. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent electrical problems.

If you are troubleshooting the CAN data link, remove the jumper wires. Leave the control modules


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terminals P1-34 and P1-50

disconnected from the data link

D. At each service tool connector measure the resistance between the terminals for the CAN data link. Also, at the connector for each control module on the global network, measure the resistance between the terminals for the CAN data link.

Proceed to Test Step 5 Results: At least one of the resistance measurements indicates an open circuit. Repair: Determine the cause of the open circuit. Repair the problem, when possible. Replace parts, if necessary. Verify that the problem is resolved.

E. Connect a jumper wire between terminals P2-11 and P2-12 F. At each service tool connector measure the resistance between the terminals for the CAN data link. Also, at the connector for each control module on the global network, measure the resistance between the terminals for the CAN data link.

Results: The resistance is between 45 Ohms and 75 Ohms. Repair: The termination resistors are OK . The data link appears to be OK . The problem is probably an intermittent problem in a connector or in the harness. If the problem persists, perform this test procedure again. If an intermittent problem is suspected, refer to Troubleshooting, "Electrical Connectors - Inspect" for information that is related to troubleshooting intermittent electrical problems

5. Check the Termination Resistors for the J1939 Data Link

Perform this test step only if you are troubleshooting a problem with the CAN data link. A. Ensure that all of the control modules are disconnected from the data link. At the service tool connector, measure the resistance between the terminals for the CAN data link.

45 Ohms and 75 Ohms

Results: The resistance is approximately 120 Ohms. There is a problem with a termination resistor. Repair: Determine the cause of the missing termination resistor. Repair the problem, when possible. Replace parts, if necessary. Verify that the problem is resolved. Results: The resistance is greater than 140 ohms. There is a problem with both termination resistors. Repair: Determine the cause of the problem. Repair the problem, when possible. Replace parts, if necessary. Verify that the problem is resolved.


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Wed Mar 29 2017 03:31:10 GMT-0500 (Hora est. Pacífico, Sudamérica) r080wc1


Data Link - Test

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