VALVE GRINDING 6V2971 - Caterpillar

System Operation Description:Use this procedure to troubleshoot the electrical system if a problem is suspected with the sensors or if any one of the diagnostic codes in Table 1 is active or easily repeated.
Table 1
Diagnostic Codes Table
Description Conditions which Generate this Code System Response
94-3 Fuel Delivery Pressure Sensor voltage above normal The Electronic Control Module (ECM) detects signal voltage that is above normal for eight seconds.
The engine has been running for two seconds.
Absolute pressures that are greater than 1101 kPa (160 psi) will also trip this fault. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to 600 kPa (87 psi).
94-4 Fuel Delivery Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for 180 seconds.
The engine has been running for two seconds.
A barometric pressure of less than 55 kPa (8 psi) will also trip this fault.
100-3 Engine Oil Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for eight seconds.
The ECM has been powered for at least two seconds.
100-4 Engine Oil Pressure Sensor voltage below normal The ECM detects signal voltage that is above normal for eight seconds.
The ECM has been powered for at least two seconds.
164-2 Injection Actuation Pressure Sensor signal erratic The ECM detects signal voltage that is inconsistent. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to 8 MPa (1160 psi).
The engine will run on a default torque map that is stored in the ECM.
The engine will experience a reduction in power.
164-3 Injection Actuation Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for one second.
164-4 Injection Actuation Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for one second.
274-3 Atmospheric Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for thirty seconds.
The ECM has been powered for two seconds.
Absolute pressures that are greater than 111 kPa (16 psi) will also trip this fault. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to the value from a map dependent value that is stored in the ECM.
A ten percent derate is subtracted from the engine power.
274-4 Atmospheric Pressure Sensor voltage below normal The ECM detects signal voltage that is above normal for thirty seconds.
The ECM has been powered for two seconds.
1785-3 Intake Manifold Pressure Sensor voltage above normal The ECM detects signal voltage that is above normal for two seconds.
The ECM has been powered for two seconds.
One of the following conditions must be satisfied:
Engine speed equals zero rpm.
or
The engine load is less than 50 percent. The code is logged.
A snapshot is triggered.
The value of the parameter will be set to 100 kPa (14.5 psi).
1785-4 Intake Manifold Pressure Sensor voltage below normal The ECM detects signal voltage that is below normal for two seconds.
The ECM has been powered for two seconds.
1835-3 Auxiliary Pressure Sensor voltage above normal The ECM detects signal voltage that is above