Navistar Medium and Heavy Duty Truck Accessing DTC's Using Cruise Switches

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1. Set parking brake for the correct signal from the Electronic System Controller (ESC).

2. Turn the ignition switch to ON. (Do not crank the engine.)

3. Press and release the CRUISE ON and RESUME/ACCEL switches at the same time within 3 seconds of the ignition switch on.

NOTE: There could be as much as a 10 second delay from the time switches are pressed to the time DTCs are flashed.

Reading DTCs

1. The red ENGINE lamp will flash once to indicate the beginning of active DTCs.

2. The amber ENGINE lamp will flash repeatedly, signaling active DTCs.

NOTE: All DTCs are three digits. (See Codes)

3. Count the flashes of the amber ENGINE lamp in sequence. After each digit of the code a short pause will occur.

• Two amber flashes, a pause; three amber flashes, a pause; and two amber flashes and a pause indicate code 232.

4. For more than one DTC, the red ENGINE lamp will flash once indicating the beginning of another active DTC.

5. After all active DTCs have flashed, the red ENGINE lamp will flash twice to indicate the start of inactive DTCs. Count the flashes from the amber ENGINE lamp. If there is more than one inactive code, the red ENGINE lamp will flash once between each DTC.

6. After all DTCs have been sent, the red ENGINE lamp will flash three times indicating end of DTC transmission.

7. To repeat DTC transmission, cycle the ignition switch and press and release the CRUISE ON and RESUME/ACCEL switches, at the same time, within 3 seconds of ignition switch on. The ECM will re-send stored DTCs.

Clearing DTCs

1. Set parking brake for the correct signal from the Electronic System Controller (ESC).

2. Turn the ignition switch to ON. (Do not crank the engine.)

3. Press and hold the CRUISE ON and RESUME/ACCEL switches at the same time.

4. Press and release the accelerator pedal three times within 6 seconds of the ignition switch on.

5. Release the cruise control switches to clear the inactive DTCs.

NOTE: Completing this procedure within 3 seconds of the ignition switch on, without turning the ignition switch off, will restart DTC transmission to the instrument panel.