GUARD 1939159 - Caterpillar

CID 1785 FMI 03Conditions Which Generate This Code:The Electronic Control Module (ECM) detects the following conditions:
The ECM has been powered for two seconds.
The signal voltage from the intake manifold pressure sensor is above 4.95 Volts DC for at least two seconds.
Diagnostic code 168-01 is not active.
No 262 codes for the 5 volt supply are active.System Response:The warning light on the control panel will flash. The ECM will log the diagnostic code. The data for the intake manifold pressure will be set to a maximum valid pressure for two seconds. The ECM will then flag the intake manifold pressure as being invalid. A default value is then used for the intake manifold pressure.For engines with an electronically controlled wastegate, the current for the wastegate solenoid will be set to a default value while this code is active. This will derate the engine. The derate will prevent any overpressure in the intake manifold which could be caused by an overspeed of the turbocharger.Possible Performance Effect:
The engine will be derated by 20%.Troubleshooting:This code can be caused by an open circuit or a short to another power source.Test Step 1. Perform the following diagnostic procedure: "Engine Pressure Sensor Open or Short Circuit - Test"Results:
OK - STOP