1A
DTC P0110 (No.18): Intake Air Temp. (IAT) Circuit Malfunction
Wiring Diagram
1. IAT sensor 3. To other sensor
2. ECM *: Vehicle equipped with immobilizer control system
DTC Detecting Condition and Trouble Area
DTC detecting condition Trouble area
• Low intake air temperature
(High voltage – High resistance)
• High intake air temperature
(Low voltage – Low resistance)
• “LT GRN/BLK” circuit open or shorted to power.
• “BLK/BLU” circuit open
• IAT sensor malfunction
• ECM malfunction
NOTE:
• When DTC P0105 (No.11), P0110 (No.18), P0115 (No.19) and P0120 (No.13) are indicated together, it is possible that “BLK/BLU” circuit is open.
• Before inspecting, be sure to check that ambient temperature is higher than –40 °C (–40 °F).
DTC Confirmation Procedure
1) Clear DTC, start engine and keep it at idle for 1 min.
2) Select “DTC” mode no scan tool and check DTC.
DTC Troubleshooting
Step Action YES NO
1
Was “Engine and Emission Control System Check” performed?
Go to Step 2.
Go to Engine and Emission Control System Check:M13A without VVT .
2
Check IAT sensor and its circuit
1) Connect scan tool to DLC with ignition switch OFF.
2) Turn ignition switch ON.
3) Check intake air temp. displayed on scan tool.
Is – 40 °C (–40 °F) or 119 °C (246 °F) indicated?
Go to Step 3.
Intermittent trouble. Check for intermittent referring to Intermittent and Poor Connection Inspection .
3
Does scan tool indicate –40 °C (–40 °F) at Step 2.
Go to Step 4.
Go to Step 6.
4
Check wire harness
1) Disconnect IAT sensor connector with ignition switch OFF.
2) Check for proper connection to IAT sensor at “LT GRN/BLK” and “BLK/BLU” wire terminals.
3) If OK, then with ignition switch ON.
Is voltage applied to “LT GRN/BLK” wire terminal about 4 – 6 V?
Go to Step 5.
“LT GRN/BLK” wire open or shorted to power, or poor “E115-15 (E115-23)” connection.
If wire and connection are OK, substitute a known-good ECM and recheck.
5
Check wire harness
1) Measure resistance between “BLK/BLU” wire terminal of IAT sensor connector and body ground.
Is resistance continuity?
Replace IAT sensor.
“BLK/BLU” wire open or poor “E115-10” connection.
If wire and connection are OK, substitute a known-good ECM and recheck.
6
Check wire harness
1) Disconnect IAT sensor connector with ignition switch OFF.
2) Measure resistance between “LT GRN/BLK” wire terminal of IAT sensor connector and body ground.
Is resistance infinity?
Replace IAT sensor.
“LT GRN/BLK” wire is shorted to ground.
If wire is OK, substitute a known-good ECM and recheck.