CHANNEL 4T9758 - Caterpillar

Recommended Actions
Use Caterpillar Electronic Technician (ET) to view the "No Start Parameters" group to view parameters related to engine starting.Note: The procedures have been listed in order of probability. Complete the procedures in the order of the listed test steps.
Table 1
Troubleshooting Test Steps Values Results
1. Fuel
A. Visually check the fuel level in the fuel tank. Do not rely on the fuel gauge only.
B. Ensure that the fuel supply valve (if equipped) is in the full OPEN position.
Fuel level
Result: The fuel level is OK.
Proceed to Test Step 2.
Result:The fuel level is not OK.
Repair: Fill the tank.
Verify that the repair eliminated the problem.
2. Check for Active Diagnostic Codes
A. Establish communication between Cat ET and the Electronic Control Module (ECM).
B. Monitor the diagnostic codes on Cat ET. Check for active diagnostic codes. Specifically check for codes related to the fuel system, the engine speed/timing sensors, and the fuel injectors.
Note: Wait at least 30 seconds in order for diagnostic codes to become active.
Active Diagnostic Codes
Result: There are active codes.
Repair: Troubleshoot any active codes before continuing with this procedure.
Verify that the repair eliminated the problem.
Result: There are no active codes.
Proceed to Test Step 3.
3. Check for Slow Cranking Speed
A. Check the cranking speed of the engine.
1. Use Cat ET to check the engine speed while cranking the engine. If the engine cranks too slowly, the engine will not start.
2. Check for the following problems:
-Low voltage for an electric starting system
-Excessive parasitic load
-Engagement of a single starting motor on a dual starting motor system
Speed
Result: The engine speed is greater than 100 rpm for a duration of four revolutions.
Proceed to the next step.
Result: The engine speed is not greater than 100 rpm for a duration of four revolutions.
Repair: Low voltage:
-Charge and/or replace the batteries as necessary. Refer to Special Instruction, SEHS9249, "Use of 4C-4911 Battery Load Tester for 6V, 8V, and 12 V Lead Acid Batteries".
Repair: Excessive parasitic load
-Remove the parasitic load
Repair: Starting Motor
-Repair and/or replace the faulty starter as necessary.
4. Engine Shutdown Switches (if applicable)
A. The engine shutdown switches must be in the OFF position.
Switches are in the OFF position
Result: The switches are in the OFF position.
Proceed to Test Step 5.
Result: The switches are not in the OFF position.
Repair: Turn the switches to the OFF position. STOP.
Verify that the repair eliminated the problem.
5. Starting Aids (if applicable)
A. If cold ambient conditions exist, check the operation of the starting aids.
Starting aids are operational
Result: The starting aid is operating correctly.
Proceed to Test Step 6.
Result: The starting aid is not operating correctly.
Repair: Refer to the appropriate diagnostic test in order to troubleshoot the starting aid.
Verify that the repair eliminated the problem.
6. Restrictions in the Air Inlet and Exhaust System
A. Check for an air filter restriction indicator (if applicable).
B. Check the air inlet and exhaust system for restrictions and/or leaks.
Air and Exhaust System restrictions
Result: There are no system restrictions.
Proceed to Test Step 7.
Result: There are system restrictions.
Repair: Refer to Systems Operation/Testing and Adjusting, "Air Inlet and Exhaust System" for additional information on the air inlet and exhaust