Series 60 DDEC V Troubleshooting – Section 53.3 Troubleshooting Flash Code 51, PID 404/FMI 3

Section 53.3
Troubleshooting Flash Code 51, PID 404/FMI 3

Possible causes are an open wire or a failed sensor.‪

Section 53.3.1
Check for Codes

Follow these steps to check for codes:‪

1. Unplug the TCO Sensor.
2. Insert jumper wire between #1–#2 of the sensor connector.
3. Start and run engine for six minutes.
   1. If code 404/3 displays, refer to "53.3.2 Check for Open" .
   2. If code 404/4 displays, go to step 4 .
4. Check the connectors for damaged, bent or broken pins. See Figure "Turbocharger Compressor Out Temperature Circuit" .
   

   Figure 1. Turbocharger Compressor Out Temperature Circuit

   1. If damaged pins are found, repair the connector and test. Refer to "53.3.2.1 Verify Procedure" .
   2. If no damaged pins are found, replace the sensor (see Figure "Turbo Compressor Temperature Out Sensor" ) Then, refer to "53.3.2.1 Verify Procedure" .
   

   Figure 2. Turbo Compressor Temperature Out Sensor

Section 53.3.2
Check for Open

The steps that brought you to this procedure indicate either the signal wire or return is open. Follow these steps to check for open: ‪

1. Check cavity E–22 at the EH connector. See Figure "Engine Harness Connector" .
   

   Figure 3. Engine Harness Connector

2. Is the wire open?
   1. If the wire was open, repair it and refer to "53.3.2.1 Verify Procedure" .
   2. If the wire was not open replace the TCTO Sensor (see Figure "Turbo Compressor Temperature Out Sensor" ). Then refer to "53.3.2.1 Verify Procedure" .

Section 53.3.2.1
Verify Procedure

‪

Follow these steps to verify the procedure.‪

1. Reconnect all connectors.
2. Start and run the engine.
3. Check for codes.
   1. If codes 351 or 404 display, try a test ECM/ECU programmed for EGR.
   2. If no codes display, the procedure is finished.
   3. If codes other than 351 or 404 display, troubleshoot those codes.