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P0110

Intake Air Temperature Sensor Circuit:




Connector: C-71:




CIRCUIT OPERATION
- Approximately 5-volt voltage is applied to the intake air temperature sensor output terminal (terminal 6) from the PCM (terminal 64) via the resistor in the PCM. The ground terminal (terminal 5) is grounded with PCM (terminal 57).
- The intake air temperature sensor is a negative temperature coefficient type of resistor. It has the characteristic that when the intake air temperature rises the resistance decreases.
- The intake air temperature sensor output voltage increases when the resistance increases and decreases when the resistance decreases.

TECHNICAL DESCRIPTION
- The intake air temperature sensor converts the intake air temperature to a voltage.
- The PCM checks whether this voltage is within a specified range.

DTC SET CONDITIONS

Check Area
- Two seconds or more have passed since the engine was started.

Judgement Criteria

- Intake air temperature sensor output voltage has continued to be 4.6 volts or higher [corresponding to an air intake temperature of -45° C (-49° F) or lower] for two seconds.
or
- Intake air temperature sensor output voltage has continued to be 0.2 volt or lower [corresponding to an air intake temperature of 125° C (257° F) or higher] for two seconds.

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

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

CAUTION: To prevent damage to the scan tool, turn the ignition switch "OFF" before connecting or disconnecting the scan tool.




STEP 1. Using scan tool MB991502, check data list item 13: Intake Air Temperature Sensor.
- The intake air temperature and temperature shown with the scan tool should approximately match.

If they don't match, go to Step 2.

If they match, it can be assumed that this malfunction is intermittent. Refer to vehicle level Testing and Inspection.




STEP 2. Check the intake air temperature sensor.
1. Disconnect the intake air temperature sensor connector A-01.
2. Measure the resistor between the intake air temperature sensor side connector terminals 5 and 6.

Standard value:
2.3 - 3.0 kohms [at 20° C (68° F)]
0.30 - 0.42 kohms [at 80° C (176° F)]




3. Measure resistance while heating the sensor using a hair drier.
- As the temperature rises, the resistance value should drop.

If all checks above meet the specifications, go to Step 3.

If any check above does not meet the specifications, replace the volume air flow sensor. Then go to Step 6.




STEP 3. Check the circuits at the intake air temperature sensor connector A-01.

1. Disconnect connector A-01 and measure at the harness side.
2. Turn the ignition switch "ON".

3. Measure the voltage between terminal 6 and ground.
- Voltage should be between 4.5 and 4.9 volts.

4. Turn the ignition switch "OFF".




5. Check for the continuity between terminal 5 and ground.
- There should be continuity (0 ohms).

If any check above does not meet the specifications, go to Step 4.

If all checks above meet the specifications, repair or replace the intake air temperature sensor connector A-01. Refer to vehicle level Testing and Inspection. Then go to Step 6.







STEP 4. Check the harness wire between intake air temperature sensor connector A-01 and PCM connector C-90.

NOTE: After checking intermediate connector C-71, check the wire. If intermediate connector C-71 is damaged, repair or replace it. Refer to vehicle level Testing and Inspection. Then go to Step 6.

If the wire between intake air temperature sensor connector A-01 and PCM connector C-90 is not damaged, go to Step 5.

If the wire between intake air temperature sensor connector A-01 and PCM connector C-90 is damaged, repair it. Then go to Step 6.




STEP 5. Check harness connector C-90 at the PCM for damage.

If harness connector C-90 is damaged, repair or replace it.Refer to vehicle level Testing and Inspection.

If harness connector C-90 is in good condition, replace the PCM.

Then go to Step 6.

STEP 6. 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 is not being output.




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