HEATER AS-SPACE 7W8709 - Caterpillar

Use this procedure in order to troubleshoot the following event codes.
Table 1
Event Code    
Description     Conditions which Activate the Code    System Response    
E226 (3) Driven Equipment Not Ready     The engine is ready to start. However, the Electronic Control Module (ECM) has received a signal which indicates that the driven equipment is not ready for the engine to start.     The shutdown output is activated. Engine cranking is prevented. The code is logged. The engine will not start.    
E270 (3) Driven Equipment Shutdown Requested     The engine is running. The ECM has received a signal which indicates that the driven equipment must be shut down.     The shutdown output is activated. The code is logged. The engine is shut down. Engine cranking is prevented.    Note: Refer to Troubleshooting, "Engine Monitoring System" for information on trip points and delay times.Probable Causes
The master Electronic Control Module (ECM) has received a "Start Inhibit" or a "Shutdown" signal.
The circuit for the "driven equipment" signal from the driven equipment is faulty.Recommended Repairs
Check the Driven Equipment
Determine whether the driven equipment has generated a "Start Inhibit" or "Shutdown" request. Determine the cause for the request. Service the driven equipment according to the recommendations of the OEM of the equipment.Check the Circuit for the Signal
The circuit for the signal must remain closed in order to allow the engine to run. Check the wiring between the driven equipment and the ECM connector for damage and/or corrosion. Refer to Troubleshooting, "Electrical Connectors - inspect". Repair the wiring, as needed.Check the resistance of the circuit between terminals P1-21 and P1-31 at the master ECM. The correct resistance of the circuit is 5 Ohms or less. If the resistance is greater than 5 Ohms, locate the source of the excessive resistance. Make repairs, as needed.