8X0139 PIN Caterpillar parts
994, 994D, 994F, 994H
Rating:
Alternative (cross code) number:
CA8X0139
8X-0139
8X0139
CA8X0139
8X-0139
8X0139
Weight: 401 pounds 181 kg.
WHEEL LOADER,
Number on catalog scheme:
13
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Information:
Diagnostic Trouble Code (DTC) Root Causes
When the Transmission Control is in the REVERSE position, a signal is sent to the Transmission Electronic Control Module (ECM). The Transmission ECM switches the backup alarm relay coil to frame ground. When the backup alarm relay is energized, +battery is applied to the backup alarm.If the backup alarm is always off, check these items:
The fuse for the relay is open.
The backup alarm has failed.
The machine harness has failed.
The machine harness is shorted to frame ground.
The backup alarm relay has failed.
The ECM has failed.Electrical Information and Schematic
Illustration 1 g06206906
Schematic of the backup alarm
Note: The diagram above is a simplified schematic of the relay connections for the Backup Alarm. The schematic is electrically correct, however not all the possible harness connectors are shown. For the complete schematic information reference one of the documents below (depending on your machine configuration).Refer to:
Electrical Schematic, UENR4170, "740 Ejector and 745 Articulated Truck (HRC) Electrical System".
Electrical Schematic, UENR4171, "740 Ejector and 745 Articulated Truck (LRC) Electrical System"Troubleshooting Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.Note: The voltage to operate the Backup Alarm is supplied from location G12 on the fuse panel (15A). If the Backup Alarm is not functioning, the technician must confirm that continuity exists across the fuse.
Table 1
Troubleshooting Test Steps Values Results
1. Check The Relay Circuit
A. Turn the key start switch and the battery disconnect switch to the OFF position.
B. Remove the backup alarm relay.
C. Turn the battery disconnect switch and the key start switch to the ON position.
The backup alarm is OFF. OK - The backup alarm is OFF.
Proceed to Test Step 2.
NOT OK - The backup alarm is ON.
Proceed to Test Step 4.
2. Check The Relay Contacts
A. Turn key start switch and disconnect switch OFF.
B. Disconnect harness connection at relay.
C. Check the resistance between contact 3 and contact 5 of the backup alarm relay.
The resistance is greater than 5K Ω. OK - The resistance measurement is greater than 5K Ω.
Proceed to Test Step 3.
NOT OK - The resistance is less than 5 Ω.
Repair: The relay for the Backup Alarm has failed, replace the relay.
STOP
3. Check The Return Circuit Of The Relay For A Short-To-Ground
A. At the connector of the backup alarm relay measure the resistance between wire 331-OR(Orange)and frame ground.
The measured resistance is greater than 5 Ω. OK - The measured resistance is greater than 5 Ω.
Proceed to Test Step 4.
NOT OK - The resistance is less than 5 Ω. The machine harness has failed.
Repair: Repair the machine harness or replace the machine harness.
4. Check The Switch Circuit Of The Backup Alarm For A Short-To-Battery
A. Turn the key start switch and the disconnect switch OFF.
B. Disconnect the
When the Transmission Control is in the REVERSE position, a signal is sent to the Transmission Electronic Control Module (ECM). The Transmission ECM switches the backup alarm relay coil to frame ground. When the backup alarm relay is energized, +battery is applied to the backup alarm.If the backup alarm is always off, check these items:
The fuse for the relay is open.
The backup alarm has failed.
The machine harness has failed.
The machine harness is shorted to frame ground.
The backup alarm relay has failed.
The ECM has failed.Electrical Information and Schematic
Illustration 1 g06206906
Schematic of the backup alarm
Note: The diagram above is a simplified schematic of the relay connections for the Backup Alarm. The schematic is electrically correct, however not all the possible harness connectors are shown. For the complete schematic information reference one of the documents below (depending on your machine configuration).Refer to:
Electrical Schematic, UENR4170, "740 Ejector and 745 Articulated Truck (HRC) Electrical System".
Electrical Schematic, UENR4171, "740 Ejector and 745 Articulated Truck (LRC) Electrical System"Troubleshooting Procedure
Note: Prior to beginning this procedure, inspect the harness connectors that are involved in the circuit. Poor connections can often be the cause of a problem in an electrical circuit. Verify that all connections in the circuit are clean, secure and in good condition. If a problem with a connection is found, correct the problem and verify that this diagnostic code is active before performing this procedure.Note: The voltage to operate the Backup Alarm is supplied from location G12 on the fuse panel (15A). If the Backup Alarm is not functioning, the technician must confirm that continuity exists across the fuse.
Table 1
Troubleshooting Test Steps Values Results
1. Check The Relay Circuit
A. Turn the key start switch and the battery disconnect switch to the OFF position.
B. Remove the backup alarm relay.
C. Turn the battery disconnect switch and the key start switch to the ON position.
The backup alarm is OFF. OK - The backup alarm is OFF.
Proceed to Test Step 2.
NOT OK - The backup alarm is ON.
Proceed to Test Step 4.
2. Check The Relay Contacts
A. Turn key start switch and disconnect switch OFF.
B. Disconnect harness connection at relay.
C. Check the resistance between contact 3 and contact 5 of the backup alarm relay.
The resistance is greater than 5K Ω. OK - The resistance measurement is greater than 5K Ω.
Proceed to Test Step 3.
NOT OK - The resistance is less than 5 Ω.
Repair: The relay for the Backup Alarm has failed, replace the relay.
STOP
3. Check The Return Circuit Of The Relay For A Short-To-Ground
A. At the connector of the backup alarm relay measure the resistance between wire 331-OR(Orange)and frame ground.
The measured resistance is greater than 5 Ω. OK - The measured resistance is greater than 5 Ω.
Proceed to Test Step 4.
NOT OK - The resistance is less than 5 Ω. The machine harness has failed.
Repair: Repair the machine harness or replace the machine harness.
4. Check The Switch Circuit Of The Backup Alarm For A Short-To-Battery
A. Turn the key start switch and the disconnect switch OFF.
B. Disconnect the
Caterpillar parts catalog:
Parts pin Caterpillar catalog:
12M 3, 12M 3 AWD, 140M 3, 140M 3 AWD, 160M 3, 160M 3 AWD, 307, 307B, 307C, 307D, 308C, 308D, 308E, 308E CR, 308E SR, 311, 311B, 311C, 311D LRR, 311F LRR, 312, 312B, 312B L, 312C, 312C L, 312D, 312D L,...
120, 120G, 12F, 12G, 130G, 140, 140G, 14E, 14G, 14H, 14H NA, 160G, 16G, 16H, 16H NA, 528, 611, 613, 613B, 613C, 613C II, 613G, 615, 615C, 621B, 621E, 621F, 621G, 621H, 623, 623B, 623E, 623F, 623G, 623...
330B L, 330D L, 336D, 336E, 336E H, 345B, 345B II, 345B L, 350, 365B, 365C, 374D L, 375, 375 L, 5110B, 834G, 834H, 972H, 972K, 973D, 988F, 988F II, 988G, 988H, 990 II, 990H, 990K, 992C, 992D, 992G, 99...
120G, 12G, 130G, 140G, 14G, 160G, 16G, 24H, 621, 621B, 621R, 627, 627B, 631C, 633C, 641, 650B, 651, 657B, 657E, 666, 824C, 834B, 836, 980C, 988B, 992C, 992D, 994, 994D, D6D, PR-450, PR-450C
611, 615, 615C, 621E, 621F, 621G, 623E, 623F, 623G, 627E, 627F, 627G, 631E, 633E II, 637E, 651E, 657E, 69D, 768C, 769C, 769D, 771C, 771D, 772B, 773B, 773D, 773E, 775B, 775D, 775E, 776C, 776D, 777B, 77...
10 FT, 10-20B, 508, 518, 528, 613, 613B, 613C, 613C II, 613G, 615C, 623G, 623H, 623K, 623K LRC, 8 FT, 8-16B, 814, 814B, 815, 815B, 816, 816B, 824C, 910, 916, 920, 926, 926A, 930, 936, 950, 950B, 950B/...
621F, 623E, 623F, 627F, 69D, 769C, 769D, 771C, 771D, 772B, 773B, 773D, 773E, 775B, 775D, 775E, 776D, 777, 777B, 777D, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D, 793C, 793D, 994
621F, 623E, 623F, 627F, 69D, 769C, 769D, 771C, 771D, 772B, 773B, 773D, 773E, 775B, 775D, 775E, 776D, 777, 777B, 777D, 784C, 785, 785B, 785C, 785D, 789, 789B, 789C, 789D, 793C, 793D, 994
990, 990 II, 992C, 992D, 994F, 994H
992C, 992D, 994, 994D, 994F, 994H, R1600, R1600G, R1600H, R1700 II, R1700G, R3000H
345C L, 365B, 374D L, 374F L, 375, 375 L, 385B, 385C, 385C FS, 385C L, 390D, 5080, 5090B, 992C, 992G, 994, 994D, 994F
365B, 365B II, 365C, 365C L, 365C L MH, 375, 385B, 385C, 385C FS, 385C L, 5080, 5090B, 5130, 980H, 980K, 994, 994D, 994F, 994H, D11R, D11T
8X0149
PIN
994, 994D, 994F, 994H
994, 994D, 994F, 994H
7I5759
PIN
5110B, 5130, 5130B, 5230, 5230B, 994, 994D, 994F, 994H
5110B, 5130, 5130B, 5230, 5230B, 994, 994D, 994F, 994H
8X0763
PIN AS
994, 994D, 994F, 994H
994, 994D, 994F, 994H
8X1401
PIN
994, 994D, 994F, 994H
994, 994D, 994F, 994H
8W2920
PIN
777B, 785, 789, 793, 994
777B, 785, 789, 793, 994
9V2568
PIN AS
980C
980C
8X0660
PIN
994, 994D, 994F, 994H
994, 994D, 994F, 994H
1G4312
PIN-SPRING
375, 375 L, 5080, 844, 854G, 990, 990 II, 992G, 994, 994D, CB-525B
375, 375 L, 5080, 844, 854G, 990, 990 II, 992G, 994, 994D, CB-525B
1002720
PIN-REACTION
994, 994D, 994F, 994H
994, 994D, 994F, 994H
1345784
PIN
994, 994D, 994H
994, 994D, 994H
0950872
PIN-COTTER
324D L, 324E L, 854G, 854K, 992G, 992K, 994, 994D, 994F, 994H, STIFF LINK
324D L, 324E L, 854G, 854K, 992G, 992K, 994, 994D, 994F, 994H, STIFF LINK
5V6379
PIN
966D, 994, AD30, AD45B, AD55, AD55B, AD60, R1700 II, R2900, R2900G
966D, 994, AD30, AD45B, AD55, AD55B, AD60, R1700 II, R2900, R2900G