Operation CHARM: Car repair manuals for everyone.
Home >> Mitsubishi Truck >> 2000 >> Montero Sport LS 2WD V6-3.0L SOHC >> Repair and Diagnosis >> A L L Diagnostic Trouble Codes ( DTC ) >> Testing and Inspection >> P Code Charts >> P0180

P0180

Fuel Temperature Sensor Circuit:




Connectors:




CIRCUIT OPERATION
- 5-volt voltage is applied to the fuel temperature sensor output terminal (terminal 1) from the PCM (terminal 51) via the resistor in the PCM.
- The fuel temperature sensor output voltage increases when the resistance increases and decreases when the resistance decreases. The ground terminal is grounded to the vehicle body.

TECHNICAL DESCRIPTION
- The fuel temperature sensor converts the fuel temperature to a voltage.
- The PCM detects the fuel temperature in the fuel tank with this output voltage.

DTC SET CONDITIONS

Check Area
- Engine coolant temperature is higher than -30°C (86°F).
- Intake air temperature is higher than -10°C (14°F).
- Barometric pressure is higher than 76 kPa (11 psi).

Judgment Criteria
- Fuel temperature sensor output voltage has continued to be 4.6 volts or higher for 5 seconds.
or
- Fuel temperature sensor output voltage has continued to be 0.1 volt or lower for 5 seconds.

TROUBLESHOOTING HINTS
The most likely causes for this code to be set are:
- Fuel temperature sensor failed.
- Open or shorted fuel temperature sensor circuit, or loose connector.
- PCM failed.

DIAGNOSIS
Required Special Tool:
MB991502: Scan Tool (MUT-II)

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.




STEP 1. Using scan tool MB991502, check data list item 4A: Fuel Temperature Sensor.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Set scan tool MB991502 to the data list mode for item 4A, Fuel Temperature Sensor.
- Approximately the same as the outside temperature when the engine is cooled.

4. Turn the ignition switch to "LOCK" (OFF) position.
If approximately the same as the outside temperature, this malfunction is intermittent. Refer to vehicle level Testing and Inspection.

If different from the outside temperature, go to Step 2.

STEP 2. Check the circuit voltage at fuel temperature sensor connector E-30.
1. Do not disconnect the fuel temperature sensor connector E-30.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 1 and ground by backprobing.

Standard value:
2.7 - 3.1 V [when fuel temperature is 0°C (32° F)]
2.1 - 2.5 V [when fuel temperature is 20°C (68° F)]
1.6 - 2.0 V [when fuel temperature is 40°C (104° F)]
0.8 - 1.2 V [when fuel temperature is 80°C (176° F)]

4. Turn the ignition switch to "LOCK" (OFF) position.
If within specifications, go to Step 3.

If not within specifications, go to Step 6.

STEP 3. Check the circuit voltage at PCM connector C-90.
1. Do not disconnect the PCM connector C-90.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 51 and ground by backprobing.

Standard value:
2.7 - 3.1 V [when fuel temperature is 0°C (32° F)]
2.1 - 2.5 V [when fuel temperature is 20°C (68° F)
1.6 - 2.0 V [when fuel temperature is 40°C (104° F)]
0.8 - 1.2 V [when fuel temperature is 80°C (176° F)]

4. Turn the ignition switch to "LOCK" (OFF) position. If within specifications, go to Step 4.
If not within specifications, check connector E-30, C-90 and repair or replace as required.

Refer to vehicle level Testing and Inspection.
Then go to Step 13.







STEP 4. Check the harness wire between fuel temperature sensor connector E-30 and PCM connector C-90.
NOTE: Check the wire after checking Intermediate connectors E-44, C-85. If Intermediate connectors E-44, C-85 is damaged, repair or replace them.

Refer to vehicle level Testing and Inspection.

Then go to Step 13.

If wire between fuel temperature sensor connector E-30 and PCM connector C-90 is not damaged, check connector C-90 and repair or replace as required.

Refer to vehicle level Testing and Inspection.

If connector C-90 is in good condition, go to Step 5.

If wire between fuel temperature sensor connector E-30 and PCM connector C-90 is damaged, repair it.

Then go to Step 13.

CAUTION: To prevent damage to scan tool MB991502, always turn the ignition switch to "LOCK" (OFF) position before connecting or disconnecting scan tool MB991502.




STEP 5. Using scan tool MB991502, check data list item 4A: Fuel Temperature Sensor.
1. Connect scan tool MB991502 to the data link connector.
2. Turn the ignition switch to "ON" position.
3. Set scan tool MB991502 to the data list mode for item 4A, Fuel Temperature Sensor.
- Approximately the same as the outside temperature when the engine is cooled.

4. Turn the ignition switch to "LOCK" (OFF) position.
If approximately the same as the outside temperature, this malfunction is intermittent. Refer to vehicle level Testing and Inspection.

If different from the outside temperature, replace the PCM. Then go to Step 13.

STEP 6. Check the ground circuit voltage at fuel temperature sensor connector E-30.
1. Do not disconnect the fuel temperature sensor connector E-30.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 3 and ground by backprobing.
- Voltage should be 0.5 volts or less.

4. Turn the ignition switch to "LOCK" (OFF) position.
If 0.5 volts or less, go to Step 7.

If more than 0.5 volts, check connector E-30, E-44 and repair or replace as required.

Refer to vehicle level Testing and Inspection.

If connector E-30, E-44 is in good condition, check the harness between fuel temperature sensor connector E-30 and ground for open circuit or damage. Then repair if necessary. Then go to Step 13.




STEP 7. Check the fuel temperature sensor connector E-30 for damage.
If the harness connector E-30 is in good condition, go to Step 8.

If the harness connector E-30 is damaged, repair or replace it.

Refer to vehicle level Testing and Inspection.

Then go to Step 13.




STEP 8. Check the fuel temperature sensor.
1. Disconnect the fuel temperature sensor connector E-30.




2. Measure the resistance between the terminal 1 and 3 of the fuel temperature sensor.
Standard value: 0.5 - 12.0 Kohms

If within specifications, go to Step 9.

If not within specifications, replace the fuel gauge unit.

Then go to Step 13.

STEP 9. Check the 5-volt voltage at fuel temperature sensor connector E-30.
1. Disconnect the fuel temperature sensor connector E-30 and measure at the harness side.
2. Turn the ignition switch to "ON" position.




3. Measure the voltage between terminal 1 and ground.
- Voltage should be between 4.8 and 5.2 volts

4. Turn the ignition switch to "LOCK" (OFF) position. If within specifications, check the harness between fuel temperature sensor connector E-30 and PCM connector C-90 for damage. Then repair if necessary.

Then go to Step 13.

If not within specifications, go to Step 10.







STEP 10. Check the harness wire between fuel temperature sensor connector E-30 and PCM connector C-90 for open circuit.

NOTE: Check the wire after checking Intermediate connectors E-44, C-85. Intermediate connectors E-44, C-85 is damaged, repair or replace them.

Refer to vehicle level Testing and Inspection.

Then go to Step 13.

If wire between fuel temperature sensor connector E-30 and PCM connector C-90 is not damaged, go to Step 11.

If wire between fuel temperature sensor connector E-30 and PCM connector C-90 is damaged, check connector E-30, C-90 and repair or replace as required.

Refer to vehicle level Testing and Inspection.

If connector E-30, C-90 is in good condition, repair the wire between fuel temperature sensor connector E-30 and PCM connector C-90.

Then go to Step 13.

STEP 11. Check the harness wire between fuel temperature sensor connector E-30 and PCM connector C-90 for short circuit to ground.
1. Disconnect the fuel temperature sensor connector E-30 and PCM connector C-90.




2. Check the continuity between fuel temperature sensor connector E-30 harness side terminal 1 and the ground.

- There should be open circuit. If open circuit, go to Step 12.

If there is continuity, check connector C-90 and repair or replace as required.

Refer to vehicle level Testing and Inspection.

If connector C-90 is in good condition, check the harness between fuel temperature sensor connector E-30 and PCM connector C-90 for short circuit to ground. Then repair if necessary.

Then go to Step 13.




STEP 12. Check PCM connector C-90 for damage.
If harness connector C-90 is in good condition, replace the PCM.
Then go to Step 13.

If harness connector C-90 is damaged, repair or replace it.

Refer to vehicle level Testing and Inspection.

Then go to Step 13.

STEP 13. Test the OBD-II drive cycle.
1. Carry out a test drive with the drive cycle pattern. Refer to Procedure 6 - Other Monitor.

2. Read the diagnostic trouble code, and confirm that a diagnostic trouble code P0180 does not reset.






pro multis · About Operation CHARM