This instruction show you guide on how to solve Caterpillar C9 engine fault code 25 PID 102-1 low boost pressure.
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The Engine Control Module (ECM) detects the following conditions:
-Actual boost is less than desired boost by more than 30 kPa (4.4 psi) for more than eight seconds.
- The current for the turbocharger solenoid is greater than 80% of the maximum value.
- Desired boost is not ZERO.
- The ECM has been powered for at least two seconds.
This engine uilizes a waste gate control valve that is electronically controlled in order to precisely regulate the boost pressure.The Engine Control Module (ECM) monitors the signal from the boost pressure sensor in order to determine the boost pressure in the intake manifold.The ECM uses this in formation and other information that is related to the current power demand and the current engine operating conditions in order to determine the optimum position of the waste gate valve the turbocharger.
The turbocharger’s wastegate valve regulates the amount of exhaust gas that is a owed to bypass the turbine wheel of the turbocharger.This allows the ECM to control the speed of the turbocharger and the boost pressure.
Probable Causes:
1) ECM Connection
2) Waste gate control solenoid (Can be replaced instead of the entire valve)
3)Harness between the ECM and the wastegate control solenoid
4) ECM Failure
5)Air inlet system restrictions or exhaust system restrictions
6) Drain orifice plugged
