This diagnosis is typically a ambient and inlet manifold pressure difference (Low Box).
111.5.1 Air System Check
Check as follows:
1. Inspect the entire air intake system for leaks and/or restrictions.
[a] If air intake system leaks and/or restrictions are found, repair as necessary.
Refer to section 111.5.1.1.
[b] If no air intake system leaks are found, go to step 2.
2. Connect to DDDL 7.0.
3. Turn the ignition ON (key On, engine OFF).
4. Perform the Turbo Actuator Hysteresis test.
[a] If the test fails, refer to section 6.5 in the Series 60 Service Manual (6SE2007).
[b] If the test passed, go to step 5.
5. With the ignition ON (key On, engine OFF) compare the barometric pressure to the intake
manifold pressure (the correct barometric pressure readings for your local altitude or your
local weather report are listed in Table 111-1).
[a] If the barometric pressure is within range for your altitude, go to step 6.
[b] If the barometric pressure is not within range for your altitude, contact the
Detroit Diesel Customer Support Center at 313–592–5800 for MCM replacement
authorization.
6. Disconnect the Intake Manifold Pressure Sensor.
7. Inspect the Intake Manifold Pressure Sensor connector for bent, spread or corroded pins.
[a] If damage is found, repair the connector as necessary. Refer to section 111.5.1.1.
[b]If no damage is found, replace the Intake Manifold Pressure Sensor. Refer to section
111.5.1.1.
111.5.1.1 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.
