34 RENR5042-02 Troubleshooting Section g00781203 Illustration 9 Direct connection of Cat ET to the P1 connector If the engine is cranking and Cat ET displays zero rpm, a problem exists in the circuits for the engine speed/timing sensors. Refer to Troubleshooting, “Engine Speed/Timing Sensor Circuit - Test”. If no smoke is present, there may be a problem with the fuel quality or there may be a problem with the fuel supply. If an engine speed is present, check the sensor installation. If the sensor is not properly installed, the ECM may read engine speed, but the ECM cannot determine the tooth pattern.
The ability for the ECM to read the tooth pattern is necessary to determine the cylinder position. Engine speed is present when engine speed is greater than 50 rpm. Refer to Troubleshooting, “Engine Speed/Timing Sensor Circuit - Test”. 3. Check the fuel pressure. Refer to Systems Operation/Testing and Adjusting, “Fuel System Pressure - Test”. 4. Ensure that the fuel system has been primed. Refer to Systems Operation/Testing and Adjusting, “Fuel System - Prime”. 5. Check for fuel supply lines that are restricted. 6. Check the fuel filters. Electrical Connections to the Electronic Unit Injector 7. Cold weather adversely affects the characteristics of the fuel.
Refer to the Operation and Maintenance Manual for information on improving the characteristics of the fuel during cold weather operation. 1. Ensure that the electronic unit injector connector (J300/P300) is fully connected and free of corrosion. 2. Check for logged diagnostic codes that are related to the cylinder. Refer to Troubleshooting, “Injector Solenoid Circuit - Test” if diagnostic codes that are related to the cylinder are present. Check for Combustion Problems Examples of conditions that may cause combustion problems are shown in the following list: Cold temperatures Check the Fuel Supply Injector misfiring 1. Check the fuel level. 2.
Monitor the exhaust for smoke while the engine is being cranked. Low compression Mechanical problem Valve lash settings