TM 5-3805-296-23-1
0050
Table 1. E390 Fuel Filter Restriction Event Code.
0050
CID FMI
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
E390 Fuel Filter Restriction -
Warning or Derate
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.
EVENT CODE SET CONDITION
Engine ECM Detects Abnormal Fuel Filter Differential Pressure.
Engine ECM Detects Above Normal Voltage on Differential Pressure
Switch Circuit T725.
POSSIBLE CAUSE
Fuel Filter Element Plugged.
Fuel Filter Wiring Harness High Resistance or Open.
Engine Interface Wiring Harness High Resistance or Open.
Basic Engine Wiring Harness High Resistance or Open.
Fuel Filter Pressure Differential Switch.
Engine ECM.
Test Step 1. Test for Plugged Fuel
1. Turn ignition switch and battery
Replace primary fuel filter element
(WP 0234) and secondary fuel filter
disconnect switch to OFF position
(TM 5-3805-296-10).
element (WP 0225). Proceed to step 2.
2. Turn battery disconnect switch to
ON position and start engine
(TM 5-3805-296-10).
3. At MSD, check for active event
E390 Fuel Filter Restriction Becomes
code(s) (WP 0008).
Inactive Troubleshooting complete.
E390 Fuel Filter Restriction Remains
Active Proceed to Test Step 2.
Test Step 2. Test Function of
Differential Pressure Switch
Circuits.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
2. Disconnect connector AW-C3
(WP 0012, Figure 40) from fuel
filter pressure differential switch
(WP 0012, Figure 39).