SEAL-RECTANGULAR 6V1657 - Caterpillar

Use this procedure to troubleshoot the turbocharger turbine speed is high problem. This procedure covers the codes in table 1.
Table 1
Event Code
Description Conditions which Activate the Code System Response
1169-10
Engine Turbocharger 2 Speed: Abnormal Rate of Change
Abnormal rate of change is detected if compressor speed deviation ratio is above 5.00% or ratio is below -12.00% while clutch is engaged and boost is matching expected boost calculated in a map engine speed and fueling dependent.(1) The code is logged.
The ECM derates the engine.(2)
(1) Refer to Table 3 for the compressor speed deviation ratio.
(2) Refer to the calculation listed in Table 2..
Table 2
Calculated Derate
(measured compressor speed / 46) < (engine speed x 0.50)
Table 3
Supercharger Speed Deviation Calculation
[measured compressor speed - expected (calculated) compressor speed (engine speed x 46.00)] / expected speed x 100] Probable Causes
Incorrect reading of supercharger speed sensorRecommended Actions
Table 4
Troubleshooting Test Steps Values Results
1. Inspect the Supercharger Speed Sensor and Harness
A. Ensure that the sensor is properly installed and the wiring harness is connected.
Sensor and Harness
Result : There is a fault in a connector, wiring harness, or sensor.
Repair: Repair any faulty connectors, wiring harness, or replace the sensor.
Verify that the repair eliminated the problem.