Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual page 401

48.1 SPN 615/FMI 3
This diagnosis is typically an open circuit.
48.1.1 Open Circuit Check
Check as follows:
1. Check for multiple codes.
[a] If 51/3 and 615/3 are present, repair the open between pin 103 of the 120–pin MCM
connector and pin 2 of the Intake Air Delta P Sensor and the Intake Throttle Valve.
See Figure 48-1. Refer to section 48.1.1.1.
Figure 48-1 Intake Air Delta P Sensor
[b] If only 615/3 is present, go to step 2.
2. Disconnect the Intake Air Delta P Sensor.
3. Measure the resistance across pins 1 and 2 of the Intake Air Delta P Sensor.
[a] If the resistance is greater than 200k Ω, replace the Intake Air Delta P Sensor.
[b] If the resistance is less than 200k Ω, go to step 4.
4. Measure the resistance across pins 1 and 3 of the Intake Air Delta P Sensor.
[a] If the resistance is greater than 50k Ω, replace the Intake Air Delta P Sensor.
[b] If the resistance is less than 50k Ω, go to step 5.
5. Turn the ignition ON (key ON, engine OFF).
6. Measure the voltage between pins 1 and 2 of the Intake Air Delta P Sensor harness
connector.
[a] If the voltage is between 4.5 and 5.5 volts, go to step 8.
[b] If the voltage is less than 4.5 volts, go to step 7.
All information subject to change without notice.
6SE568 Copyright © PRELIMINARY 2007 DETROIT DIESEL CORPORATION
(Rev. )
MBE 4000 DDEC VI TROUBLESHOOTING GUIDE
48-3