Table 1. Transmission Code (0573-03 to 0967-09) Troubleshooting Procedures - Continued.
CDI FMI CODE
TEST OR INSPECTION
0621-04 Downshift Switch
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
0621-04 Code Active - Proceed to
Test Step 2.
Trans/Chassis 120M and verify
0621-04 is active.
0621-04 Code Not Active - Trouble-
Test Step 2. Test Downshift Switch
1. Turn ignition switch and battery
disconnect switch to the OFF
position (TM 5-3805-293-10).
2. Disconnect harness connector
from transmission ECM J2 (WP
N OT E
Harness connector is located behind cab bulkhead cover on right rear
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
continuity between harness con-
wiring harness (WP 0266).
Proceed to step 10.
124) terminal 36 and all other ter-
minals on harness connector FA-
C21 and to machine ground.
There should be no continuity.