Symptom:
P0180-FUEL TEMPERATURE SENSOR CIRCUIT - SIGNAL VOLT-
AGE TOO HIGH
When Monitored and Set Condition:
P0180-FUEL TEMPERATURE SENSOR CIRCUIT - SIGNAL VOLTAGE TOO HIGH
When Monitored:
With the ignition on.
Set Condition:
The fuel temperature sensor signal voltage is above 4.7 volts.
POSSIBLE CAUSES
INTERMITTENT CONDITION
FUEL TEMPERATURE SENSOR GROUND CIRCUIT OPEN
FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE
FUEL TEMPERATURE SENSOR
FUEL TEMPERATURE SENSOR SIGNAL CIRCUIT OPEN
ENGINE CONTROL MODULE
TEST
ACTION
APPLICABILITY
1
NOTE: If multiple DTCs are present, the most likely cause is a 5-Volt Supply
or Sensor Ground circuit shorted to voltage or ground. Refer to the Service
Information Wiring section for circuits that would affect multiple DTCs.
NOTE: If the ECM detects and stores a DTC, the ECM also stores the
engine/vehicle operating conditions under which the DTC was set. Some of
these conditions are displayed on the DRB at the same time the DTC is
displayed.
NOTE: Before erasing stored DTCs, record these conditions. Attempting to
duplicate these conditions may assist when checking for an active DTC.
Turn the ignition on.
With the DRB, monitor the Fuel Temperature Sensor voltage.
Is the Fuel Temperature Sensor voltage above 4.80 volts?
All
Yes
→ Go To 2
No
→ Go To 6
2
Turn the ignition off.
Disconnect the Fuel Temperature Sensor harness connector.
Turn the ignition on.
Measure the voltage on the Fuel Temperature Sensor Signal circuit.
Is the voltage above 5.5 volts?
All
Yes
→ Repair the Fuel Temperature Sensor Signal circuit for a short to
voltage.
Perform ROAD TEST VERIFICATION - VER-2.
No
→ Go To 3
49
DRIVEABILITY - DIESEL