RETAINER 1298172 - Caterpillar

System Operation Description:Use this procedure to troubleshoot a suspected problem with a detonation sensor or use this procedure if one of the diagnostic codes in Table 1 or Table 2 are active or easily repeated.
Table 1
Diagnostic Codes Table    
Code    Conditions which Generate this Code    System Response    
1501-3 Cylinder #1 Detonation Sensor : Voltage Above Normal
1502-3 Cylinder #2 Detonation Sensor : Voltage Above Normal
1503-3 Cylinder #3 Detonation Sensor : Voltage Above Normal
1505-3 Cylinder #5 Detonation Sensor : Voltage Above Normal
1506-3 Cylinder #6 Detonation Sensor : Voltage Above Normal
1507-3 Cylinder #7 Detonation Sensor : Voltage Above Normal
1509-3 Cylinder #9 Detonation Sensor : Voltage Above Normal
1510-3 Cylinder #10 Detonation Sensor : Voltage Above Normal
1513-3 Cylinder #13 Detonation Sensor : Voltage Above Normal
1514-3 Cylinder #14 Detonation Sensor : Voltage Above Normal     The run relay and the crank terminate relay are energized. The input of a signal from a detonation sensor to the Electronic Control Module (ECM) is greater than 4.8 VDC for ten seconds.     The shutdown output is activated. The code is logged.
The engine is shut down.    
Table 2
Diagnostic Codes Table    
Code    Conditions which Generate this Code    System Response    
1501-4 Cylinder #1 Detonation Sensor : Voltage Below Normal
1502-4 Cylinder #2 Detonation Sensor : Voltage Below Normal
1503-4 Cylinder #3 Detonation Sensor : Voltage Below Normal
1505-4 Cylinder #5 Detonation Sensor : Voltage Below Normal
1506-4 Cylinder #6 Detonation Sensor : Voltage Below Normal
1507-4 Cylinder #7 Detonation Sensor : Voltage Below Normal
1509-4 Cylinder #9 Detonation Sensor : Voltage Below Normal
1510-4 Cylinder #10 Detonation Sensor : Voltage Below Normal
1513-4 Cylinder #13 Detonation Sensor : Voltage Below Normal
1514-4 Cylinder #14 Detonation Sensor : Voltage Below Normal
1515-4 Cylinder #15 Detonation Sensor : Voltage Below Normal
1516-4 Cylinder #16 Detonation Sensor : Voltage Below Normal     The run relay and the crank terminate relay are energized. The input of the signal from the detonation sensor to the ECM is less than 1.0 VDC for ten seconds.     The shutdown output is activated. The code is logged.
The engine is shut down.    Detonation sensors are located on the upper cylinder block between every two cylinders. Each sensor monitors two adjacent cylinders. For example, one sensor monitors cylinders 1 and 3.The ECM supplies 8 VDC in order to power the sensors. The detonation sensors provide electrical signals to the ECM that indicate mechanical engine vibrations. Each sensor outputs an electrical signal that is filtered and the signal is amplified. The frequency of the signal corresponds to the mechanical frequency of the vibrations. The amplitude of the signal is proportional to the intensity of the vibrations.The ECM monitors the signals in order to determine the presence and the severity of the detonation. The ECM retards the timing in order to limit detonation levels. The timing may be retarded for a single cylinder or for all of the cylinders, if necessary. If retardation of the timing does not sufficiently limit the detonation, the engine is shut down.The ECM can retard timing by as few