TM 5-3805-296-23-1
0055
Table 1. 0168 Powertrain Power Supply Diagnostic Code.
0055
CID FMI
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
0168-01 Electrical System
Voltage Low
Always inspect 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 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/Chassis ECM Detects Battery Voltage is Below 18 VDC.
POSSIBLE CAUSE
Battery or Batteries.
Charging System.
Main Cab Wiring Harness High Resistance or Open.
Circuit Breaker Panel.
Transmission/Chassis ECM.
Test Step 1. Test Batteries.
Perform battery testing on each battery
All Batteries Test Good Proceed to
(WP 0170).
Test Step 2.
One or More Batteries Fail Testing
Replace all batteries that failed testing
(WP 0306).
Proceed to Test Step 8.
Test Step 2. Test Charging System.
Perform charging system testing
Alternator Tests Good Proceed to
(WP 0169).
Test Step 3.
Alternator Fails Testing Replace
alternator (WP 0246).
Proceed to Test Step 8.
Test Step 3. Test Main Relay Supply
Voltage at Circuit Breaker Panel.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
2. Remove fuse F20 from circuit
breaker panel
(TM 5-3805-296-10).
3. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-296-10).
