Series 60 – SPN 100/FMI 4 – ENGINE OIL PRESSURE OUTSIDE OF NORMAL OPERATING RANGE

This diagnosis is typically an Engine Oil Pressure Sensor circuit failed low.

26.3.1
Failed Low Circuit Check
Check as follows:
1. Turn the ignition ON (key On, engine OFF).
2. Check for multiple codes:
[a] If 100/4, 94/4, 4407/4, 3609/4 and 3610/4 are present, repair the short to ground
between pin 82 of the 120–pin MCM and the Engine Oil, Doser Fuel Line, Doser Fuel
Compensation, DPF Inlet and DPF Outlet Pressure sensors. Refer to section 26.3.1.1.
[b] If 100/4, 94/4 and 4407/4 are present, repair the open between pin 82 of the 120–pin
MCM connector and the Engine Oil, Doser Fuel Line and Doser Fuel Compensation
Sensors. Refer to section 26.3.1.1.
[c] If only 100/4 is present, go to step 3.
3. Disconnect the Engine Oil Pressure Sensor.
4. Measure the voltage between pins 1 and 3 of the EOP Sensor harness connector.
See Figure 26-3.

[a]If the voltage is less than 4.5 volts, repair the open between pin 82 of the 120–pin
MCM connector and pin 3 of the EOP Sensor harness connector. Refer to section 26.3.1.1.
[b] If the voltage is greater than 4.5 volts, go to step 5.
5. Turn the ignition OFF.
6. Measure the resistance between pin 2 of the EOP Sensor harness connector and pin 54
of the 120–pin MCM connector.
[a] If the resistance is less than 5 Ω, repair the open between pin 2 of the EOP Sensor
harness connector and pin 54 of the 120–pin MCM connector. Refer to section 26.3.1.1.
[b] If the resistance is greater than 5 Ω, repair the short to ground between pin 2 of
the EOP Sensor harness connector and pin 54 of the 120–pin MCM connector. Refer to section 26.3.1.1.

26.3.1.1
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.

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