P0111
DTC P0111: Intake Air Temp. (IAT) Circuit Range / Performance Problem
Wiring Diagram
DTC Detecting Condition and Trouble Area
DTC Confirmation Procedure
WARNING:
- When performing a road test, select a place where there is no traffic or possibility of a traffic accident and very careful during testing to avoid occurrence of an accident.
- Road test should be carried out with 2 persons, a driver and tester, on a level road.
NOTE:
Check to make sure that the following conditions are satisfied when using this DTC confirmation procedure.
- Intake air temperature: -14 °C (6.8 °F) or higher
- Altitude (barometric pressure): 2020 m, 6650 ft or less (540 mmHg, 72 kPa or more)
- Engine coolant temp. at engine start: between -10 °C and 30 °C (14 °F and 86 °F)
1) With ignition switch turned OFF, connect scan tool.
2) Turn ON ignition switch, clear DTC using scan tool.
3) Start engine and warm up to normal operating temperature. (ECT approx. 90 - 95 °C, 194 - 203 °F)
4) Drive vehicle more than 40 mph (60 km/h) for 15 min. or more. (Run engine at idle for 40 min. with vehicle stop if vehicle can not be driven.)
5) Stop vehicle and run engine at idle speed for 1 min. or more.
6) Check DTC and pending DTC.
DTC Troubleshooting
1.
Was "Engine System Check" performed?
YES
Go to Step 2.
NO
Go to Engine System Check Engine System Check.
2. Check IAT sensor and its circuit.
Connect scan tool to DLC with ignition switch turned OFF.
Turn ignition switch ON.
Check intake air temp. displayed on scan tool.
Is -40 °C (-40 °F) or 205 °C (401 °F) indicated?
YES
Go to Step 3.
NO
Intermittent trouble.
Check for intermittent referring to Intermittent and Poor Connection Inspection.
3. Check wire harness.
Disconnect IAT sensor connector with ignition switch turned OFF.
Check for proper connection to IAT sensor at "LT GRN/BLK" and "ORN" wire terminal.
If OK, then with ignition switch turned ON.
Is voltage applied to "LT GRN/BLK" wire terminal about 4 - 6 V?
YES
Go to Step 7.
NO
Go to Step 4.
4. Check ECM voltage.
Disconnect connectors from ECM with ignition switch turned OFF.
Remove ECM from vehicle body and connect connectors to ECM.
Check proper connection of connector at "C46-16" wire terminals.
If OK, then turn ON ignition switch, check voltage between "C46-16" and vehicle body ground.
Is voltage about 4 - 6 V at each terminal?
YES
"LT GRN/BLK" wire open circuit.
If wire and connection are OK, go to Step 5.
NO
Go to Step 5.
5. Check wire circuit.
Disconnect connectors from ECM with ignition switch turned OFF.
Measure resistance between "LT GRN/BLK" wire terminal and vehicle body ground.
Is resistance infinity?
YES
Go to Step 6.
NO
"LT GRN/BLK" wire shorted to ground or other circuits.
If wire are OK, substitute a known-good ECM and recheck.
6. Check wire circuit.
Turn ignition switch ON.
Check voltage between "LT GRN/BLK" wire terminal and body ground.
Is voltage about 0 V at each terminal?
YES
Go to Step 7.
NO
"LT GRN/BLK" wire shorted to others circuit.
If wire are OK, substitute a known-good ECM and recheck.
7. Check wire circuit.
Measure resistance between "C46-16" terminal and "LT GRN/BLK" wire terminal in IAT sensor connector with ignition switch turned OFF.
Is resistance below 5 ohms?
YES
Go to Step 8.
NO
"LT GRN/BLK" wire in high resistance circuit.
8. Check ground circuit.
Connect connector to ECM.
Check proper connection of IAT sensor at "ORN" wire terminal.
Measure resistance between "ORN" wire terminal in IAT sensor connector and vehicle body ground.
Is resistance below 10 ohms?
YES
Go to Step 10.
NO
Go to Step 9.
9. Check ground circuit.
Measure resistance between "C46-27" terminal and vehicle body ground.
Is resistance below 5 ohms?
YES
"ORN" wire open circuit or high resistance circuit.
Poor "C46-27" connection.
NO
Faulty ECM ground circuit.
If circuit are OK, substitute a known-good ECM and recheck.
10. Check IAT sensor.
Check IAT sensor according to Intake Air Temperature (IAT) Sensor Inspection Intake Air Temperature (IAT) Sensor Inspection.
Is it in good condition?
YES
Substitute a known-good ECM and recheck.
NO
Replace IAT sensor.