TM 5-3805-298-23-1
0109
Table 1. 1251 Alternator R - Terminal Diagnostic Codes - Continued.
0109
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
3. Install left and right lower cab
1251-0 Alternator R Data
access panels (WP 0347).
Valid but Above Normal
4. Start engine (TM 5-3805-298-10).
Diagnostic Code 1251-0 Alternator R
Operational Range -
Using MSD, check for active
Data Valid but Above Normal
Continued
diagnostic codes (WP 0008).
Operational Range Becomes
Inactive Troubleshooting complete.
Diagnostic Code 1251-0 Alternator R
Data Valid but Above Normal
Operational Range Remains Active
Repeat troubleshooting from the
beginning.
NOTE
1251-1 Alternator R Data
Valid but Below Normal
Always inspect wiring harness connectors that are involved in the circuit.
Operational Range
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 the
connection is found, correct the problem and verify that this malfunction
or diagnostic code is active before performing this procedure.
Perform open or short-circuit test at each wiring harness connection to
identify the correct harness to replace.
Tag all wiring harnesses to aid in installation.
Perform this test only if condition is active.
DIAGNOSTIC CODE SET CONDITION
Transmission ECM detects alternator R output is below operating range.
POSSIBLE CAUSE
Alternator.
Engine wiring harness shorted to ground.
Lower cab wiring harness shorted to ground.
Transmission ECM.
