63.3 TROUBLESHOOTING FLASH CODE 63
The following procedure will troubleshoot Flash Code 63.
Perform the following steps to determine assignment.
1. Turn ignition ON.
2. Plug in the DDR.
3. Select INs/OUTs. To what is PWM assigned? Write down assignment vs cavity and
code, listed in Table 63-1.
4. Select code display.
5. Determine Failure Mode Identifier (FMI).
[a] If FMI 3 displays, there is a short to the battery. Refer to section 63.3.2
[b] If FMI 4 displays, refer to step 6
6. Verify function.
[a] If there is a component wired to this position, refer to section 63.3.3.
[b] If there is no component wired to this position, reprogram to eliminate the assigned
function. (A change may be required to the DDC mainframe.) Refer to section 63.3.9.
Verify Short to Battery
Perform the following steps to verify a short to battery:
1. Turn ignition OFF.
2. Disconnect 30-pin connector: engine connector if PWM 2, 3 or 4; vehicle connector if
3. Measure voltage between the cavity with the code and the good ground.
[a] If the voltage measurement is greater than 3 volts, the connector is shorted to the
battery. Repair. Refer to section 63.3.9.
All information subject to change without notice.
6SE497 9709 Copyright © 1997 DETROIT DIESEL CORPORATION