RACE 1T0763 - Caterpillar

Use this procedure in order to troubleshoot an engine that cranks but does not start. Also, use this procedure if one of the following event codes is active or logged.
Table 1
J1939 Code and Description Comments
1664-31
Engine Automatic Start Failed "Engine Overcrank Time" is the duration for attempting engine start-up.
An event is generated if the engine does not start within this period of time.
The code is logged. Probable Causes
Codes
Air/Fuel pressure module
Fuel pressure
Cranking speed
Cold engine
Engine overload
Air choke
Inlet air restriction
Fuel system
Needle valves
Gas Shutoff Valve (GSOV)
Connectors and wiring
Speed/Timing sensor
Ignition systemRecommended Actions
Unburned gas in the air inlet and exhaust system may ignite when the engine is started. Personal injury and/or property damage may result.Before starting an engine that may contain unburned gas, purge the unburned gas from the air inlet and exhaust system. Refer to the topic on purging unburned gas in the "Starting the Engine" section.
Table 2
Troubleshooting Test Steps Values Results
1. Check for Codes
A. Connect Cat® Electronic Technician (ET) to the service tool connector.
B. Look for active codes that are associated with the system for the event code.
Codes
Result: An associated code is active.
Repair: Troubleshoot any associated codes before continuing with this test.
Result: A code is active or logged.
Proceed to Test Step 2.
2. Check the Air/Fuel Pressure Module
Note: This step is for G3616 only.
Module
Result: The air/fuel pressure module is OK.
Proceed to Test Step 3.
Result: The air/fuel pressure module is NOT OK.
Repair: Refer to Troubleshooting, "Air/Fuel Pressure Module - Calibrate" for additional information.
If the problem is not resolved, proceed to Test Step 3.
3. Fuel Pressure is Present During Initial Cranking
Note: If fuel pressure is present before the fuel command, the engine will not start.
A. Inspect the Gas Shutoff Valve (GSOV).
B. Make sure that the GSOV can move smoothly.
Fuel Pressure
Result: Fuel pressure is present during initial cranking.
Proceed to Test Step 4.
Result: Fuel pressure is not present during initial cranking.
Repair: Repair or replace the GSOV.
If the problem is not resolved, proceed to Test Step 4.
4. Check for Slow Cranking Speed
A. Inspect the starting system.
B. Make sure that the air supply has sufficient pressure.
Cranking Speed
Result: The engine speed is greater than 80 rpm for a duration of four revolutions.
Proceed to Test Step 5.
Result: The engine speed is not greater than 80 rpm for a duration of four revolutions.
Repair: Repair or replace damaged components. Refer to Troubleshooting, "Air Starting Motor Problem" for additional information.
If the problem is not resolved, proceed to Test Step 5.
5. Check the Temperature of the Engine
Note: If the engine is too cold, the engine may not start.
Cold Engine
Result: