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Diagnostic Code 35 Engine Overspeed Warning
Conditions Which Generate This Code:The Electronic Control Module (ECM) detects an engine speed greater than 3300 rpm. System Response:1. Diagnostic Code 35 is current (Diagnostic Lamp, ECAP, or DDT) and is LOGGED in memory. -AND-2. The 3176 System will attempt to limit engine rpm to Top Engine Limit (TEL) by not allowing the unit injectors to inject fuel. The injectors are shut off because the engine is running at a speed that exceeds rated rpm. A diagnostic code 35 has no effect on performance. Troubleshooting:Diagnostic Code 35 warns of an overspeed condition and is for information only. It does not indicate a fault in the 3176 System.Factory passwords are required to clear a diagnostic code 35.Diagnostic Code 37 Fuel Pressure Sensor Fault
Conditions Which Generate This Code:Fuel Pressure Sensor signal voltage drops below 0.2 volts DC or rises above 4.7 volts DC for at least ten seconds. System Response:1. Diagnostic Code 37 is current (Diagnostic Lamp, ECAP, or DDT) and is LOGGED in memory.2. Electronic Control Module (ECM) "Fuel Pressure" reading is set to 0 kPa (0 psi) when fault is active.3. Engine operation is NOT affected. Troubleshooting:Follow P-226: Fuel Pressure Sensor Test, in this manualDiagnostic Code 42 Check Sensor Calibrations
On new (replacement) Electronic Control Modules (ECM), Diagnostic Code 42 will appear until sensors have been calibrated. Conditions Which Generate This Code:1. The Speed/Timing Sensor is not correctly calibrated, -AND/OR-2. The Boost Pressure Sensor is not correctly calibrated. System Response:1. Diagnostic Code 42 is current (Diagnostic Lamp, ECAP, or DDT) but is NOT LOGGED in memory.2. If Speed/Timing Sensor is not correctly calibrated, injection timing will default to base timing.3. If Boost Pressure Sensor is not correctly calibrated, then boost pressure is set to 0 kPa (0 psi) by the ECM. This will limit fuel delivery rate which in turn will limit engine horsepower. Troubleshooting:1. Use an ECAP or DDT to calibrate the Boost Pressure Sensor. Follow P-302: Boost Pressure Sensor Calibration, in this manual.2. Only an ECAP can be used to calibrate the Speed/Timing Sensor. Follow P-301: Speed/Timing Sensor Calibration, in this manual or "Calibrating Injection Timing" in the 3176 Vehicular Diesel Engine, Systems Operation Testing And Adjusting Manual, Form SENR4964.Diagnostic Code 51 Intermittent Battery Power To ECM
Conditions Which Generate This Code:Battery voltage to the Electronic Control Module (ECM) momentarily drops below six volts DC. Quickly turning the key off, then back on, may cause a Code 51 to be generated. System Response:1. Diagnostic Code 51 is current (Diagnostic Lamp, ECAP, or DDT) and remains active as long as the key is ON. Fault is LOGGED in memory only if the fault occurs while the engine is running.2. Interruption of electrical power may result in a brief loss of engine power or a complete engine shutdown, depending on the duration of the electrical power loss. Troubleshooting:Follow P-210: Electrical Power Supply Test, in this manual.Diagnostic Code 52 ECM or Personality Module Fault
Conditions Which Generate This Code:The Electronic Control Module (ECM) has detected a fault