BASE AS 3941339 - Caterpillar

Table 1
Code and Description Conditions which Generate This Code System Response
876-0
Compressor Clutch Circuit: High - most severe The supercharger clutch is not responding to the closing command. The code is logged.
876-1
Compressor Clutch Circuit : Low - most severe The supercharger clutch is not responding to the opening command. The code is logged.
876-5
Compressor Clutch Circuit : Current Below Normal The ECM detects an open circuit. The code is logged.
876-6
Compressor Clutch Circuit : Current Above Normal The ECM detects a short circuit. The code is logged.
876-7
Compressor Clutch Circuit : Not Responding Properly One supercharger slip is detected. The code is logged.
The slip is counted by the ECM.
876-12
Compressor Clutch Circuit : Failure The supercharger slip detections exceeds the trip point.
Reset the supercharger slip counter. The code is logged.
876-14
Compressor Clutch Circuit : Special Instruction The supercharger clutch coil temperature is above the trip point. The code is logged.
876-15
Compressor Clutch Circuit : High - least severe (1) The ECM detects a short circuit. The code is logged.
876-16
Compressor Clutch Circuit : High - moderate severity (2) The ECM detects a short circuit. The code is logged.
876-17
Compressor Clutch Circuit : Low - least severe (1) The ECM detects a short circuit. The code is logged.
876-18
Compressor Clutch Circuit : Low - moderate severity (2) The ECM detects a short circuit. The code is logged.
Table 2
Associated Code
Code Code Description Comments
1169-10 Engine Turbocharger 2 Speed : Abnormal Rate of Change Inspect the supercharger speed sensor and wiring harness. Probable Causes
Belt
Belt tensioner
Supercharger speed sensor
Supercharger drive pulley
Supercharger clutchRecommended Action
Table 3
Troubleshooting Test Steps Values Results
1. Check for Diagnostic Trouble Codes
A. Establish communication between Cat® Electronic Technician (Cat ET) and the Electronic Control Module (ECM) . Refer to Troubleshooting, "Electronic Service Tools", if necessary.
Codes
Result: One of the following codes are active or logged.
- 876-0
- 876-1
- 876-7
- 876-12
Proceed to Test Step 2.
Result: One of the following codes are active or logged.
- 876-5
- 876-6
- 876-14
- 876-16
- 876-17
- 876-15
- 876-18
Proceed to Test Step 3.
2. Check the Condition of the Supercharger Clutch Drive Components
A. Inspect the condition of the drive belts.
B. Check the belt tension and check the automatic belt tensioners.
Excessive belt tension can result in damage to the supercharger clutch.
C Check the condition of the supercharger clutch. Look for deep grooves that have been worn into the pulley by the belt. Check for mechanical blockage of the clutch.
Drive Belt
Result: The clutch drive components are in good condition and the belt tension is correct.
Proceed to Test Step 3.
Result: The clutch drive components are in good condition and only an 876-0 and/or 876-1 code is still active, replace the clutch.
Result: The clutch drive belt components are not in good condition or the belt tension is incorrect.
Repair:Replace the damage or worn components. Refer to Disassembly and Assembly for the correct procedure.
Replace the supercharger clutch if the drive pulley is worn or damaged. If an 876-12 code was logged before replacing the clutch, reset the slippage counter in Cat ET.
If necessary, replace the automatic belt tensioner. Refer to Disassembly and Assembly for the correct procedure.
Verify that the repair eliminated