Product Link 151/201 MID 122 - CID 0269 - FMI 03 Caterpillar

Conditions Which Generate This Code:

This diagnostic code is recorded when the voltage of the sensor supply circuit (T930-WH-18) is above the normal range (nominal 8.3 DCV). Any sensor connected to this supply may not operate properly or may be damaged. If there is no sensor connected, then this fault can be considered a nuisance fault. The possible causes of this diagnostic code are listed below:

• The circuit for +V (T930-WH-18) to the sensor is shorted to battery.

• The sensor is faulty.

• The ECM is faulty. This is unlikely.

Test Step 1. CHECK THE SENSOR SUPPLY OUTPUT

1. Disconnect the Product Link Input/Output cable (J2) from the machine sensor cable.

2. Turn the key start switch to the ON position.

3. Measure the sensor supply output (J2-1) to verify it is less than 9 DCV when on and less than 4 DCV when off.

Expected Result:

The sensor supply output measures above less than 4 DCV in the off state and less than 9 DCV in the on state.

Results:

• OK - The voltage is in the required voltage range. The Product Link Sensor Supply and Product Link harness are likely not faulty. The machine harness or the external sensor may be faulty. Proceed to Test Step 3.

• NOT OK - The voltage is not in the required voltage range. The Product Link cable has a possible short to battery. Proceed to Test Step 2.

Test Step 2. CHECK THE PRODUCT LINK HARNESS FOR A SHORT TO BATTERY.

1. Turn the key start switch to the OFF position.

2. Keep the Product Link Input/Output cable disconnected from the machine sensor cable.

3. At Product Link harness, measure the resistance from sensor supply contact J2-1 (+V) to PL cable J1-1.

Expected Result:

The resistance should be greater than 5000 ohms.

Results:

• OK - The Product Link harness is correct. Proceed to Test Step 3.

• NOT OK - There is a short in the Product Link harness J2-1 (T930-WH-18) and a battery source (J1-1).

  Repair: Repair or replace the Product Link harness.

  Stop.

Test Step 3. CHECK THE SENSOR CABLE FOR A SHORT TO BATTERY.

1. Keep the Product Link Input/Output cable disconnected from the machine sensor cable.

2. At the sensor machine harness, measure the resistance from sensor supply contact J2-1 (+V) to battery power.

Expected Result:

The resistance should be greater than 5000 ohms.

Results:

• OK - The sensor or its harness are Sensor harness is correct are not shorted to battery. Proceed to Test Step 4.

• NOT OK - There is a short between the sensor harness J2-1 (T930-WH-18 and a battery source, or the sensor has failed resulting in a short to battery.

  Repair: Replace the wiring harness or repair the wiring harness.

  Stop.

Test Step 4. CHECK IF THE DIAGNOSTIC CODE IS STILL ACTIVE.

1. Clean the contacts of the harness connectors.

2. Reconnect all harness connectors.

3. Turn the key start switch to the ON position.

4. Operate the machine.

5. Determine if CID 0269 FMI 03 diagnostic code is present by using electronic technician.

Expected Result:

The CID 0269 FMI 03 diagnostic code is present.

Results:

• OK - The problem has not been corrected. It is unlikely that the ECM is faulty.

  Repair: Perform the previous Steps again. If the cause of the diagnostic code is not found, replace the Product Link ECM. See Testing and Adjusting, "Electronic Control Module (ECM) - Replace"

  Stop.

• NOT OK - The diagnostic code is NOT present. The problem does not exist at this time. The initial problem 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.