MBE 900 DDEC VI Troubleshooting – Section 74.3 SPN 723/FMI 8

Section 74.3
SPN 723/FMI 8

A typical diagnosis is time out.‪

Section 74.3.1
Time Out Check

Check as follows:‪

1. Start and run the engine.
2. Check for active fault codes.
   1. If fault codes 723/3 and 723/8 are active, troubleshoot active fault code 723/3. Refer to "77.1 SPN 723/FMI 3" .
   2. If fault codes 723/4 and 723/8 are not active, go to step 3 .
   3. If fault codes 723/4 and 723/8 are active, refer to "74.3.2 Camshaft Position Sensor Check" .
3. Shutdown the engine.
4. Ensure that the sensor is correctly positioned and check for active codes.
   1. If the sensor position is correct and fault code 723/8 is active, refer to "74.3.2 Camshaft Position Sensor Check" .
   2. If the sensor position is incorrect and fault code 723/8 is not active, remove and replace the camshaft sensor sleeve. Refer to "74.3.2.1 Verify Repairs" .

Section 74.3.2
Camshaft Position Sensor Check

Perform the following steps to check the sensor.‪

1. Remove the Camshaft Position Sensor and ensure that the sensor bores are not damaged. If damaged is present, repair as necessary. Refer to "74.3.2.1 Verify Repairs" .
2. Check the Camshaft Position Sensor for proper axial play. Repair as necessary if the axial play is incorrect. Refer to "74.3.2.1 Verify Repairs" .

Section 74.3.2.1
Verify Repairs

Verify repairs as follows:‪

1. Turn ignition OFF.
2. Reconnect any electrical connections that were disconnected to perform the diagnosis.
3. Clear codes with DDDL 7.0 or latest version.
4. Start and bring engine up to operating temperature (over 140°F/60°C).
5. Verify operation is satisfactory and no warning lamps illuminate. If warning lamps illuminate, troubleshoot the codes. If assistance is required, call the Detroit Diesel Customer Support Center at 313–592–5800.