RETAINER 8M9929 - Caterpillar

Use this procedure to troubleshoot the electrical system if a problem is suspected with the passive sensors. Also, use this procedure if any one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Trouble Codes
J1939 Code and Description Conditions that Generate the Code System Response
52-3 Engine Intercooler Temperature : Voltage Above Normal The ECM detects signal voltage that is greater than 4.95 VDC for 8 seconds. The code is logged.
The value of the parameter is set to a default value.
52-4 Engine Intercooler Temperature : Voltage Below Normal The ECM detects signal voltage that is less than 0.2 VDC for 8 seconds.
105-3 Engine Intake Manifold 1 Temperature : Voltage Above Normal The ECM detects signal voltage that is greater than 4.95 VDC for 8 seconds. The code is logged.
Ambient temperature must be greater than −35 °C (−31 °F) to log this diagnostic code.
The value of the parameter is set to a default value.
105-4 Engine Intake Manifold 1 Temperature : Voltage Below Normal The ECM detects signal voltage that is less than 0.2 VDC for 8 seconds. The code is logged.
Ambient temperature must be less than 140 °C (284 °F) to log this diagnostic code.
The value of the parameter is set to a default value.
110-3 Engine Coolant Temperature : Voltage Above Normal The ECM detects signal voltage that is greater than 4.95 VDC for 8 seconds. The code is logged.
The value of the parameter is set to a default value.
110-4 Engine Coolant Temperature : Voltage Below Normal The ECM detects signal voltage that is less than 0.2 VDC for 8 seconds.
172-3 Engine Air Inlet Temperature : Voltage Above Normal The ECM detects signal voltage that is greater than 4.95 VDC for 8 seconds. The value of the parameter is set to a default value.
172-4 Engine Air Inlet Temperature : Voltage Below Normal The ECM detects signal voltage that is less than 0.2 VDC for 8 seconds.
175-3 Engine Oil Temperature 1 : Voltage Above Normal The ECM detects signal voltage that is greater than 4.95 VDC for 8 seconds. The value of the parameter is set to a default value.
175-4 Engine Oil Temperature 1 : Voltage Below Normal The ECM detects signal voltage that is less than 0.2 VDC for 8 seconds. System OperationUse this procedure to troubleshoot any suspect problems with the following sensors for the primary ECM:
Coolant temperature sensor (Primary & Secondary ECM)
Intake manifold air temperature sensor (Primary & Secondary ECM)
Engine oil temperature sensor (Primary ECM)
Turbocharger inlet temperature sensor (Primary ECM)
SCAC temperature sensor (Primary ECM)This engine utilizes a redundant control system in the case of an ECM failure. If the primary ECM fails, the secondary ECM provides for engine control and engine system monitoring. The secondary ECM utilizes several additional active sensors to monitor engine operation. The following sensors can be found on the engine and are only utilized by the secondary ECM during a failure of the primary ECM:When troubleshooting these sensors, ensure that the secondary ECM is controlling the engine. except