TM 5-3805-298-23-1
0052
Table 1. 168 Electrical System Voltage Diagnostic Codes - Continued.
052
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
168-1 Electrical System
Voltage Low
Always inspect wiring harness connectors that 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 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 wiring harness to replace.
Tag all wiring harnesses to aid in installation.
Perform this test only if condition is active.
DIAGNOSTIC CODE SET CONDITION
Engine ECM detects battery voltage is below 18 VDC.
POSSIBLE CAUSE
Battery or batteries.
Charging system.
Engine wiring harness high resistance or open.
Lower cab wiring harness high resistance.
Fuse panel.
Ground connection.
Engine ECM.
Test Step 1. Test Batteries.
1. Connect MSD. Select C6.6 924,
Diagnostic Code 168-1 Electrical
start engine (TM 5-3805-298-10),
System Voltage High Is Not Active -
Troubleshooting is complete.
and check for active diagnostic
codes (WP 0008).
Diagnostic Code 168-1 Electrical
System Voltage High Remains
Active - Proceed to step 2.
2. Perform battery testing on each
All Batteries Test Good Proceed to
battery (WP 0165).
Test Step 2.
One or More Batteries Fail Testing
Replace all batteries that failed testing
(WP 0281).
Proceed to Test Step 11.
Test Step 2. Test Charging System.
Perform Charging System Test
Alternator Tests Good Proceed to
(WP 0165).
Test Step 3.
Alternator Fails Testing Replace
Alternator (WP 0238).
Proceed to Test Step 11.
