Detroit Diesel MBE 4000 DDEC VI Troubleshooting Manual page 402

48.1 SPN 615/FMI 3
7. Measure the voltage between pin 1 of the Intake Air Delta P Sensor harness connector
and ground.
[a] If the voltage is between 4.5 and 5.5 volts, repair the open circuit between pin 2 of
the Intake Air Delta P Sensor harness connector and pin 103 of the 120–pin MCM
connector. See Figure 48-2. Refer to section 48.1.1.1.
Figure 48-2 120–pin MCM Connector
[b] If the voltage is less than 4.5 volts, repair the open circuit between pin 1 of the Intake
Air Delta P Sensor harness connector and pin 117 of the 120–pin MCM connector.
Refer to section 48.1.1.1.
8. Turn the ignition OFF.
9. Disconnect the 120–pin MCM connector.
10. Measure the resistance between pins 1 and 3 of the Intake Air Delta P Sensor harness
connector.
[a] If the resistance is greater than 5 Ω, go to step 11.
[b] If the resistance is less than 5 Ω, repair the short in wires between pins 1 and 3 of
the Intake Air Delta P Sensor harness connector and pin 109 of the 120–pin MCM
connector. Refer to section 48.1.1.1.
11. Measure the resistance between pin 3 of the Intake Air Delta P Sensor harness connector
and pin 109 of the 120–pin MCM connector.
[a] If the resistance is greater than 3 Ω, repair the open between pin 3 of the Intake
Air Delta P Sensor harness connector and pin 109 of the 120–pin MCM connector.
Refer to section 48.1.1.1.
48-4
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(Rev. ) All information subject to change without notice.