1353879 EXTENSION GP-EXHAUST Caterpillar parts
994D, 994F, 994H
Rating:
Alternative (cross code) number:
CA1353879
135-3879
1353879
CA1353879
135-3879
1353879
WHEEL LOADER,
Number on catalog scheme:
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Information:
Use this procedure to troubleshoot the electrical system if a problem is suspected with the power to the engine Electronic Control Module (ECM) or if any one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
CDL Code Code Description Comments
168-2 Electrical System Voltage : Erratic, Intermittent, or Incorrect The engine is running. The battery voltage falls below 6 VDC and the voltage returns above 9 VDC for three voltage readings in the last 7 seconds.
168-3 Electrical System Voltage : Voltage Above Normal The ECM detects voltage that is above the acceptable value.
168-4 Electrical System Voltage : Voltage Below Normal The ECM detects voltage that is below the acceptable value.
1834-2 Ignition Key Switch loss of signal The ECM detects an erratic signal from the keyswitch. The keyswitch was cycled at least three times in the last second. The engine ECM requires the keyswitch to be in the ON position in order to maintain communications with Caterpillar Electronic Technician (ET).
Illustration 1 g02100347
Schematic for the electrical power supply circuit
Table 2
Troubleshooting Test Steps Values Results
1. Check for codes
A. Establish communication between the Cat ET and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Start the engine. Run the engine until the engine is at normal operating temperature.
C. Download the "Product Summary Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
Look for these codes:
• 168-2
• 168-3
• 168-4
• 168-2
Codes
Result: A 168-2 or a 1834-2 diagnostic code is active.
Proceed to Test Step 2.
Result: A 168-3 diagnostic code is active.
Proceed to Test Step 3.
Result: A 168-4 diagnostic code is active.
Proceed to Test Step 4.
2. Inspect the Electrical Connectors and the Wiring For the Charging Circuit
A. Turn the keyswitch to the OFF position.
B. Check the harness connections at the battery and at the alternator.
C. Check the harness between the battery and the alternator.
Electrical Connectors
Result: The harness and connectors appear to be OK.
Repair: There is a problem with
Table 1
Diagnostic Codes Table
CDL Code Code Description Comments
168-2 Electrical System Voltage : Erratic, Intermittent, or Incorrect The engine is running. The battery voltage falls below 6 VDC and the voltage returns above 9 VDC for three voltage readings in the last 7 seconds.
168-3 Electrical System Voltage : Voltage Above Normal The ECM detects voltage that is above the acceptable value.
168-4 Electrical System Voltage : Voltage Below Normal The ECM detects voltage that is below the acceptable value.
1834-2 Ignition Key Switch loss of signal The ECM detects an erratic signal from the keyswitch. The keyswitch was cycled at least three times in the last second. The engine ECM requires the keyswitch to be in the ON position in order to maintain communications with Caterpillar Electronic Technician (ET).
Illustration 1 g02100347
Schematic for the electrical power supply circuit
Table 2
Troubleshooting Test Steps Values Results
1. Check for codes
A. Establish communication between the Cat ET and the ECM . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
B. Start the engine. Run the engine until the engine is at normal operating temperature.
C. Download the "Product Summary Report" from the engine ECM before performing any troubleshooting or clearing diagnostic trouble codes.
Look for these codes:
• 168-2
• 168-3
• 168-4
• 168-2
Codes
Result: A 168-2 or a 1834-2 diagnostic code is active.
Proceed to Test Step 2.
Result: A 168-3 diagnostic code is active.
Proceed to Test Step 3.
Result: A 168-4 diagnostic code is active.
Proceed to Test Step 4.
2. Inspect the Electrical Connectors and the Wiring For the Charging Circuit
A. Turn the keyswitch to the OFF position.
B. Check the harness connections at the battery and at the alternator.
C. Check the harness between the battery and the alternator.
Electrical Connectors
Result: The harness and connectors appear to be OK.
Repair: There is a problem with
Caterpillar SIS machinery equipment:
Caterpillar parts catalog:
Parts extension Caterpillar catalog:
120H, 120H ES, 120H NA, 12H, 12H ES, 12H NA, 135H, 135H NA, 140H, 140H ES, 140H NA, 143H, 14H, 14H NA, 160H, 160H ES, 160H NA, 163H, 163H NA, 16H, 16H NA, 768C, 769C, 771C, 772B, 773B, 775B, 776C, 784...
120M, 120M 2, 12M, 12M 2, 12M 3, 12M 3 AWD, 140M, 140M 2, 140M 3, 140M 3 AWD, 14M, 160M, 160M 2, 160M 3, 160M 3 AWD, 16M, 24M, 769D, 771D, 773D, 773E, 775D, 777D, 784C, 785, 785B, 785C, 785D, 789, 789...
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