DTC P0112: Intake air temperature Circuit Low Input

CIRCUIT OPERATION
• Approximately 5 volts are applied to the intake air temperature sensor output terminal (terminal No. 6) from the ECM (terminal No. 72) <M/T> or PCM (terminal No. 64) <A/T> via the resistor in the ECM <M/T> or PCM <A/T>. The ground terminal (terminal No. 5) is grounded with ECM (terminal No. 40) <M/T> or PCM (terminal No. 16) <A/T>.
• The intake air temperature sensor is a negative temperature coefficient type of resistor. 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 ECM <M/T> or PCM <A/T> checks whether this voltage is within a specified range.
DESCRIPTIONS OF MONITOR METHODS
• A short circuit is detected while monitoring the intake air temperature sensor output.
MONITOR EXECUTION
Continuous
MONITOR EXECUTION CONDITIONS (Other monitor and Sensor)

Other Monitor (There is no temporary DTC stored in memory for the item monitored below)
• Not applicable

Sensor (The sensor below is determined to be normal)
• Not applicable
DTC SET CONDITIONS Logic Flow Chart


Check Condition
2 seconds or more have passed since the staring sequence was completed.

Judgement Criterion
• Intake air temperature sensor output voltage has continued to be 0.2 volt or lower [corresponding to an air intake temperature of 115°C (239°F) or higher] for 2 seconds.
OBD-II DRIVE CYCLE PATTERN
Refer to Diagnostic Function - OBD-II Drive Cycle - Pattern 19 .
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 connector damage.
• ECM failed. <M/T>
• PCM failed. <A/T>