0001688 COLLAR Caterpillar parts COLLAR
Alternative (cross code) number:
Illustration 1 g01004093
Schematic Of The Relay (Air Inlet Heater)This diagnostic code is recorded when the ECM reads the current of the relay as being above normal. There is a short to ground. The possible causes of this diagnostic code are listed:
The circuit of the relay is shorted to ground.
The relay has failed.
The ECM has failed. This is unlikely. Note: Ensure that the CID 0617 FMI 06 is on hold.Note: The following test procedure may create other diagnostic codes. Ignore these created diagnostic codes and clear the diagnostic codes when the original diagnostic code has been corrected.System Response:When this diagnostic code occurs, a warning is shown on the monitor. The diagnostic code will cause the air inlet heater to be turned OFF at all times.Test Step 1. CHECK THE RELAY.
Turn the disconnect switch and the key start switch to the ON position. Do not start the engine.
Ensure that the CID 0617 FMI 06 is on hold.
Observe the status of the diagnostic code.
Disconnect the relay with the active diagnostic code from the machine harness. Expected Result: The diagnostic code is no longer showing when the relay is disconnected.Results:
YES - The diagnostic code is no longer showing when the relay is disconnected. The circuit is correct.Repair: The relay has failed. Repeat this test step "CHECK THE RELAY" in order to verify the relay failure. Replace the relay.STOP
NO - The diagnostic code remains active. Proceed to test step 2.Test Step 2. CHECK THE RELAY CIRCUIT FOR A SHORT TO GROUND.
Turn the key start switch to the OFF position.
Disconnect the machine harness from the relay.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At the machine harness connector, measure the resistance from the signal contact J2-5 (wire 310-PU) to all possible sources of ground.Expected Result:There should be greater than 5000 ohms resistance (no continuity). Results:
OK - The resistance measurement is correct. The machine harness is correct.STOP
NOT OK - There is a short in the machine harness. Repair: The short is between the signal wire (310-PU) and the circuit with the low resistance measurement. Repair the machine harness or replace the machine harness.STOPTest Step 3. CHECK IF THE DIAGNOSTIC CODE REMAINS.
Inspect the harness connectors and clean the contacts of the harness connectors.
Reconnect all harness connectors.
Turn the disconnect switch and the key start switch to the ON position.
Enter service mode of the Caterpillar Electronic Technician (ET) and clear all inactive diagnostic codes.
Operate the machine.
Check if the CID 0617 FMI 06 for the relay is active. Expected Result:CID 0617 FMI 06 for the relay is NOT active. Results:
YES - The diagnostic code is NOT active.Repair: The diagnostic code does not exist at this time. The initial diagnostic code was probably caused by a poor electrical connection or a short at one of the harness connectors that was disconnected and reconnected. Resume normal machine operation. STOP
NO - The diagnostic code has not been corrected.Repair: It is unlikely that the ECM has failed. Exit this procedure and perform this procedure again. If the cause of the diagnostic code