INPUT AND OUTPUT SIGNALS FOR STEERING ECU (792) TROUBLESHOOTING - CONTINUED
Table 17. Error Code 412
- Autolube Pump Control,
Short Circuit Failure (USMC Only) Troubleshooting Procedures.
TEST OR INSPECTION
Error Code 412 - Autolube Pump Control, Short
Circuit Failure (USMC Only).
Error code 412 is an information type error code. It
may not activate for the operator. The operator may
report the auto lube pump is not working. Enter DIAG
STEERING 2(16) in the Diagnostic menu to verify the
code or enable the information type codes in the initial-
1. Test relay. Remove the plastic Replace relay if resistance between
cover from the right rear of the terminals 85 and 86 is not 290 to
cab to access the cab 350 Ohms.
distribution box (WP 0074 00).
Open the cab distribution box
to access the relay boards.
Remove relay 3018 and test
(WP 0113 00).
Disconnect connector X174B
found, disconnect X47 and
located in the middle panel.
Check for continuity to ground b. If continuity to ground is still
on the loose part of X174B at
found, check wire 476 for
pin 2. There should not be
continuity to ground.
c. Replace grounded X174B to
X47 cable (WP 0113 00).
Disconnect connector X47 and
found, replace wire A476.
connector XK1 located on one b. If continuity to ground is not
of the relay boards. Check for
found, check wire A174B2 for
continuity to ground on the
loose part of XK1 at pin 8.
There should not be continuity
4. Check ECU (792) pin 60 for a. Replace damaged ECU (792)
terminal board (WP 0080 00).
b. Replace ECU (792) (WP 0080