TM 5-3805-293-23-1
0017
Table 1. Transmission Code (0573-03 to 0967-09) Troubleshooting Procedures - Continued.
CDI FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
0621-04 Downshift Switch
System Response:
Voltage Below Normal
ECM will log a diagnostic code.
N OT E
Always inspect the harness connectorsthat are involved in the circuit.
Poor connections can often be the cause of a problem in an electrical
circuit. Verify that all connections in the circuit are clean and secure,
and that all connections are in good condition. If a problem with a
connection is found, correct the problem and verify that this diagnostic
code is Active before performing this procedure.
Perform open or short circuit test ateach harness connection to identify
correct harness to replace.
Perform this test only if condition is active.
Test Step 1. Verify if Code 0621-04
is Active.
1. Connect MSD (WP 0006). Select
0621-04 Code Active - Proceed to
Test Step 2.
Trans/Chassis 120M and verify
0621-04 is active.
0621-04 Code Not Active - Trouble-
shooting complete.
Test Step 2. Test Downshift Switch
Circuits.
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
2. Disconnect harness connector
FA-C21 (WP 0009, Figure 124)
from transmission ECM J2 (WP
0009, Figure 112).
N OT E
Harness connector is located behind cab bulkhead cover on right rear
of cab.
3. Remove rear bulkhead cover
plate (WP 0266).
4. Disconnect rear chassis wiring
harness connector FA-C22 (WP
0009, Figure 47) from cab lower
wiring harness connector P-C69
(WP 0009, Figure 46) (WP 0188).
5. Using digital multimeter, test for
Continuity - Replace rear chassis
continuity between harness con-
wiring harness (WP 0266).
nector FA-C21 (WP 0009, Figure
Proceed to step 10.
124) terminal 36 and all other ter-
No Continuity - Proceed to step 6.
minals on harness connector FA-
C21 and to machine ground.
There should be no continuity.
