TM 5-3805-298-23-1
0048
Table 1. 41 8VDC Supply Voltage Diagnostic Codes - Continued.
048
CID FMI CODE
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
41-4 8VDC Supply Voltage Is
Below Normal or the Voltage
Always inspect wiring harness connectors that are involved in the circuit.
Is Shorted Low
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 electronic control module (ECM) detects 8-volt supply is less than
7.2 volts DC for more than one second.
POSSIBLE CAUSE
Engine wiring harness is shorted to ground.
Lower cab wiring harness is shorted to ground.
Engine ECM.
Test Step 1. Check for Active
Diagnostic Codes.
1. Connect MSD and select C6.6 924
2. Start engine or attempt to start
Diagnostic Code 41-4 Active -
engine (TM 5-3805-298-10) while
Proceed to Test Step 2.
using MSD to check for active
Diagnostic Code 41-4 Not Active -
diagnostic codes (WP 0008).
Troubleshooting is complete.
Test Step 2. Test for Shorted Throttle
Position Sensor.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-298-10).
2. Disconnect connector C-C8
(WP 0012, Figure 14) from throttle
position sensor.
3. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-298-10).
