MBE 900 DDEC VI Troubleshooting – Section 93.1 SPN 1636 /FMI 2

Section 93.1
SPN 1636 /FMI 2

This diagnostic condition is typically erratic data.‪

Section 93.1.1
Erratic Data Source Check

Check as follows:‪

Note: When diagnosing rationality erratic data faults always refer to any SIBs first for any known issues.

1. Check the air intake, CAC EGR system integrity and the intake throttle system integrity.
2. Connect the diagnostic tool.
3. Monitor the engine RPM, engine coolant temperature, intake manifold temperature, EGR temperature, EGR PW and EGR Delta P counts.
4. With the engine at idle and the coolant temperature above 160°, are the EGR PW less than 7% and the EGR Delta P counts less than 135 (NO EGR FLOW)? Is the intake manifold temperature within __ ° of the EGR temperature?
   1. If yes, go to step 7 .
   2. If no, go to step 5 .
5. Disconnect the Intake Manifold Pressure/Temp Sensor and the 120–pin MCM connector.
6. Bridge pins 1 and 2 of the Intake Manifold Pressure/Temp Sensor, measure the resistance at pins 52 and 106 of the 120–pin MCM connector.
   1. If the resistance is greater than 3 Ω, repair the harness. Refer to "93.1.1.1 Verify Repairs" .
   2. If the resistance is less than 3 Ω, replace the sensor. Refer to "93.1.1.1 Verify Repairs" .
7. With the engine running at 1500 rpm and coolant temperature above 160°, command EGR PW to 50% (EGR Delta P counts will also rise because of EGR flow). Is the intake manifold temperature within __° of the EGR temperature?
   1. If yes, contact the Detroit Diesel Customer Support Center (313–592–5800).
   2. If no, replace the sensor. Refer to "93.1.1.1 Verify Repairs" .

Section 93.1.1.1
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.