G3600 A4 Engines Exhaust Temperature Is Low Caterpillar


Exhaust Temperature Is Low
`
1.1. Probable Causes
2.1. Recommended Actions

Use this procedure in order to troubleshoot a low exhaust temperature. Also, use this procedure if one of the following event codes is active or logged.

Table 1
J1939 Code and Description  Comments 
5686-1
Engine Exhaust Gas Port #1 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5687-1
Engine Exhaust Gas Port #2 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5688-1
Engine Exhaust Gas Port #3 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5689-1
Engine Exhaust Gas Port #4 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5690-1
Engine Exhaust Gas Port #5 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5691-1
Engine Exhaust Gas Port #6 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5692-1
Engine Exhaust Gas Port #7 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5693-1
Engine Exhaust Gas Port #8 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5694-1
Engine Exhaust Gas Port #9 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5695-1
Engine Exhaust Gas Port #10 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5696-1
Engine Exhaust Gas Port #11 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5697-1
Engine Exhaust Gas Port #12 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5698-1
Engine Exhaust Gas Port #13 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5699-1
Engine Exhaust Gas Port #14 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5700-1
Engine Exhaust Gas Port #15 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 
5701-1
Engine Exhaust Gas Port #16 Difference from Average Temperature : Low - most severe (3) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The engine is shut down.
The code is logged. 

Table 2
J1939 Code and Description  Comments 
5686-17
Engine Exhaust Gas Port #1 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5687-17
Engine Exhaust Gas Port #2 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5688-17
Engine Exhaust Gas Port #3 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5689-17
Engine Exhaust Gas Port #4 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5690-17
Engine Exhaust Gas Port #5 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5691-17
Engine Exhaust Gas Port #6 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5692-17
Engine Exhaust Gas Port #7 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5693-17
Engine Exhaust Gas Port #8 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5694-17
Engine Exhaust Gas Port #9 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5695-17
Engine Exhaust Gas Port #10 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5696-17
Engine Exhaust Gas Port #11 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5697-17
Engine Exhaust Gas Port #12 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5698-17
Engine Exhaust Gas Port #13 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5699-17
Engine Exhaust Gas Port #14 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5700-17
Engine Exhaust Gas Port #15 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5701-17
Engine Exhaust Gas Port #16 Difference from Average Temperature : Low - least severe (1) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 

Table 3
J1939 Code and Description  Comments 
5686-18
Engine Exhaust Gas Port #1 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5687-18
Engine Exhaust Gas Port #2 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5688-18
Engine Exhaust Gas Port #3 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5689-18
Engine Exhaust Gas Port #4 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5690-18
Engine Exhaust Gas Port #5 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5691-18
Engine Exhaust Gas Port #6 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5692-18
Engine Exhaust Gas Port #7 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5693-18
Engine Exhaust Gas Port #8 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5694-18
Engine Exhaust Gas Port #9 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5695-18
Engine Exhaust Gas Port #10 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5696-18
Engine Exhaust Gas Port #11 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5697-18
Engine Exhaust Gas Port #12 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5698-18
Engine Exhaust Gas Port #13 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5699-18
Engine Exhaust Gas Port #14 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5700-18
Engine Exhaust Gas Port #15 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 
5701-18
Engine Exhaust Gas Port #16 Difference from Average Temperature : Low - moderate severity (2) 
The cylinder exhaust temperature is lower than the average temperature for all of the cylinders. The amount of deviation has exceeded the trip point for the programmed delay time.
The code is logged. 

Probable Causes

  • Codes

  • Needle valves

  • Check valve

  • Parameters

  • Inlet air restriction

  • Light loads

  • Thermocouple

  • Valve lash

  • Low compression

Recommended Actions

Table 4
Troubleshooting Test Steps  Values  Results 

1. Check for Codes

A. Connect Cat® Electronic Technician (ET) to the service tool connector.

B. Look for active codes that are associated with the system for the event code.
 

Codes
 

Result: An associated code is active.

Repair: Troubleshoot any associated codes before continuing with this test.

Result: A code is active or logged.

Proceed to Test Step 2.
 

2. Check the Needle Valves Adjustments

If the setting for the fuel's LHV is too low, the air/fuel ratio will be too rich.

A. If the needle valves require adjustment, do the following procedure:

- Fully close all of the needle valves.
- Open all of the needle valves 2.5 turns.
- Enter "Engine Prechamber Calibration" mode in Cat ET.
- Record engine average burn time.
- Adjust each needle valve until all cylinders' burn times are within +/- 0.12 milliseconds of the engine average burn time.
- Exit "Engine Prechamber Calibration" mode.

Note: The recommended position of the needle valve is 2.5 turns open.
 

Needle Valves
 

Result: The needle valves are OK.

Proceed to Test Step 3.

Result: The needle valves are NOT OK.

Repair: Adjust the needle valves to the correct setting. Refer to Testing and Adjusting, "BTU and Precombustion Chamber Adjustments" for additional information.

If the problem is not resolved, proceed to Test Step 3.
 

3. Inspect the Check Valve

Note: The check valve may be stuck. The check valve must move freely in order to prevent fuel from continuously entering the precombustion chamber.
 

Check Valve
 

Result: The check valve is OK.

Proceed to Test Step 4.

Result: The check valve is NOT OK.

Repair: Clean or replace the check valve. Clean with a nonflammable solvent that will not leave residue.

If the problem is not resolved, proceed to Test Step 4.
 

4. Check for Incorrect Monitoring System Parameters

A. Connect Cat ET.

B. Use Cat ET to verify that the correct parameters are being used.

- Exhaust temperature module
- Exhaust port temperatures
 

Parameters
 

Result: The parameters are correct.

Proceed to Test Step 5.

Result: The parameters are not correct.

Repair: Input the correct parameters. Refer to Troubleshooting, "Event Codes" for additional information.

If the problem is not resolved, proceed to Test Step 5.
 

5. Check for Inlet Air Restriction

Note: Inlet air restriction can cause uneven exhaust port temperatures. Cylinders at the front half of the engine may have exhaust port temperatures that are lower than the exhaust port temperatures for the cylinders at the rear half of the engine by 10 to 20 °C (18 to 36 °F).

A. Check the air filter restriction indicator, if equipped. Refer to the Operation and Maintenance Manual for additional information.

B. Measure the inlet air restriction for each turbocharger. Refer to Troubleshooting, "Inlet Air Is Restricted" for additional information.
 

Restriction
 

Result: The inlet air restriction is OK.

Proceed to Test Step 6.

Result: The inlet air restriction is NOT OK. An imbalance in the system is discovered.

Repair: Repair or replace damaged inlet air system components. Equalize the inlet air restriction for each of the turbochargers.

If the problem is not resolved, proceed to Test Step 6.
 

6. Check for a Cylinder Misfire

Note: Operation with a low load can result in low exhaust temperatures.

A. Operate the engine at low idle or near low idle in order to detect a misfire problem.
 

Misfire
 

Result: There is not a cylinder misfire.

Proceed to Test Step 7.

Result: There is a cylinder misfire.

Repair: Troubleshoot the cause of the misfire. Refer to Troubleshooting, "Engine Misfires, Runs Rough or Is Unstable" for additional information.

If the problem is not resolved, proceed to Test Step 7.
 

7. Check for Faulty Thermocouples

A. Observe the temperatures from the thermocouples after the engine is shut off.

When the engine is operating properly, the temperatures from similar locations are reduced at a similar rate. Also, the temperatures from similar locations are comparable.
 

Thermocouples
 

Result: The thermocouples are OK.

Proceed to Test Step 8.

Result: The thermocouples are NOT OK.

Repair: Switch the suspect thermocouple for another thermocouple. If the temperature problem follows the thermocouple, replace the suspect thermocouple.

If the temperature problem stays at the original location of the suspect thermocouple, investigate the cause for the low temperature.

If the problem is not resolved, proceed to Test Step 8.
 

8. Check the Valve Lash

Note: The valve lash can affect the performance of the engine.
 

Valve Lash
 

Result: The valve lash is OK.

Proceed to Test Step 9.

Result: The valve lash is NOT OK.

Repair: Reset the valve lash. Refer to Testing and Adjusting, "Valve Lash and Valve Bridge Adjustment (Gas Admission Valve Lash)" for additional information.

If the problem is not resolved, proceed to Test Step 9.
 

9. Check for Low Cylinder Compression

A. Measure the cylinder pressures of the suspect bank in order to check for problems that are related to compression.
 

Low Compression
 

Result: The cylinder pressure is NOT OK.

Repair: Repair or replace damaged components.

Verify that the repair eliminated the problem.
 

If the procedure did not correct the issue, contact your Cat dealer Technical Communicator (TC). For further assistance, your TC can confer with the Dealer Solutions Network (DSN).

Information System:

16M Series 3, 16, 18M Series 3 and 18 Motor Grader Power Train System
G3600 A4 Engines Exhaust Temperature Is High
C13, C15, and C18 Tier 4 Final Engines Valve Mechanism Cover
C13, C15, and C18 Tier 4 Final Engines Turbocharger
12M Series 3, 140M Series 3, 160M Series 3, 140, 150 and and 160 Motor Graders Electronic Control (Power Train System)
G3600 A4 Engines Oil Pressure Is High
374F and 390F Excavators and 390F MHPU Mobile Hydraulic Power Unit Sensor Signal (PWM) - Test
C4.4 Engines for Caterpillar Built Machines Glossary of Electronic Control Terms
C4.4 Engines for Caterpillar Built Machines Connecting Rod - Inspect
C4.4 Industrial Engine Fuel Related Components in Cold Weather
C15 and C18 On-Highway Engines Valve Mechanism Cover Base - Remove and Install
C280-16 Engine Air Starting Motor - Remove and Install
C13, C15, and C18 Tier 4 Final Engines Exhaust Combustion (ARD)
G3600 A4 Engines Alternator Problem - Charging Problem and/or Noisy Operation
725C, 725C2, 730C, 730C2 and 730C, 730C2 EJECTOR Articulated Truck Systems Modulating Valve (Transmission Hydraulic Control)
New IGBT Driver For UPSB505 {1401, 4480}
G3600 A4 Engines Electrical Power Supply - Test
G3600 A4 Engines Fuel Temperature Is High
3516C Marine Engine Product Lifting
3500E Marine Engines Alarms and Shutoffs
2013/12/18 New Main Rotor, Bearing Sleeve, Bearing Retainer Bar, And Cable Lugs Are Now Available For Gas Generator Sets Packaged With 2650 Frame High Voltage Generators {4459, 5258}
HI315B Injector System Priming{1256, 1258}
2014/02/21 New Software Is Used For Certain C280 Marine Engines {1902, 1920}
Wear on Swash Plate Support in Side By Side Pumps on Certain Excavators{5070}