TM 5-3805-296-23-1
0026
Table 1. 0174 Fuel Temperature Sensor Diagnostic Codes.
0026
CID FMI
TEST OR INSPECTION
CORRECTIVE ACTION
NOTE
0174-03 Fuel Temperature
Sensor Voltage Above
Always inspect harness connectors that are involved in the circuit. Poor
Normal
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 with engine running.
DIAGNOSTIC CODE SET CONDITION
Engine ECM Detects Above Normal Voltage on Fuel Temp Sensor Signal Circuit
F421.
POSSIBLE CAUSE
Fuel Filter Wiring Harness High Resistance, Open, or Shorted.
Engine Interface Wiring Harness High Resistance, Open, or Shorted.
Basic Engine Wring Harness High Resistance, Open, or Shorted.
Fuel Temperature Sensor.
Engine ECM.
Test Step 1. Test Fuel Temp Sensor
Signal Voltage.
1. Turn ignition switch and battery
disconnect switch to OFF position
(TM 5-3805-296-10).
2. Disconnect connector AW-C2
(WP 0012, Figure 38) from fuel
temperature sensor connector
(WP 0012, Figure 37).
3. Turn battery disconnect switch and
ignition switch to ON position
(TM 5-3805-296-10).
4. Using digital multimeter
Voltage Greater Than 5.5 V Proceed
(WP 0540), test for voltage
to Test Step 2.
between connector AW-C2
Voltage 5.5 V or Less Proceed to
terminal 1 and terminal 2
Test Step 5.
(WP 0012, Figure 38).