DTC P0110:00 [PCM (SKYACTIV-G 2.5)]

DESCRIPTION	IAT sensor No.1 circuit internal malfunction
DETECTION CONDITION	Determination conditions	• The following conditions are met: ― The MAF sensor/IAT sensor No.1 determines an internal malfunction itself and the PCM receives error signals from the MAF sensor/IAT sensor No.1 for 5 s. ― The PCM receives a value other than the preset standard for the output value from the IAT sensor No.1 for 5 s.
	Preconditions	• The following DTCs are not detected: ― MAF sensor/IAT sensor No.1: U060F:00
	Drive cycle	• 1
	Self test type	• CMDTC self test, KOEO self test, KOER self test
	Sensor used	• MAF sensor/IAT sensor No.1
FAIL-SAFE FUNCTION	• Restricts the upper limit of the engine speed. • Inhibits the evaporative purge control.
VEHICLE STATUS WHEN DTCs ARE OUTPUT	• Illuminates check engine light. • Rough idling, poor acceleration, stalling
POSSIBLE CAUSE	• MAF sensor/IAT sensor No.1 loose • MAF sensor/IAT sensor No.1 connector or terminals malfunction • PCM connector or terminals malfunction • Short to ground in wiring harness between the following terminals: ― MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE ― MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT • Open circuit in wiring harness between the following terminals: ― MAF sensor/IAT sensor No.1 terminal A—PCM terminal 2AI ― MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE ― MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT • Short to power supply in wiring harness between MAF sensor/IAT sensor No.1 terminal B and PCM terminal 2BE • MAF sensor/IAT sensor No.1 circuits are shorted to each other • MAF sensor/IAT sensor No.1 malfunction • PCM malfunction

• When there is an internal malfunction in IAT sensor No.1, the MAF sensor/IAT sensor No.1 sends a malfunction signal to the PCM. When the PCM receives a malfunction signal from the MAF sensor/IAT sensor No.1, the MAF sensor/IAT sensor No.1 determines an internal malfunction and stores a DTC.

In addition, when the PCM receives a value other than the preset standard for the output value from IAT sensor No.1 continuously, the PCM determines that there is an internal malfunction in the MAF sensor/IAT sensor No.1 and stores a DTC.

Item	Definition	Unit	Condition/Specification
MAF	Mass air flow input from MAF sensor	g/Sec	• Displays MAF
MAF sensor voltage	V	• Ignition switched ON (engine off) (MAF: 0.00 g/s {0 lb/min}): Approx. 1.69 V (ECT is 53 °C {127 °F}) • Idle (after warm up) (MAF: 2.50 g/s {0.331 lb/min}): Approx. 1.89 V (ECT is 93 °C {199 °F}) • Racing (engine speed is 2,000 rpm) (MAF: 3.80 g/s {0.503 lb/min}): Approx. 2.02 V (ECT is 95 °C {203 °F})
IAT	Intake air temperature (No.1) input from IAT sensor No.1	°C, °F	• Displays IAT (No.1)
IAT sensor No.1 voltage	V	• IAT is 20 °C {68 °F}: Approx. 2.70 V • IAT is 40 °C {104 °F}: Approx. 1.80 V • IAT is 60 °C {140 °F}: Approx. 1.20 V

STEP	INSPECTION	RESULTS	ACTION
1	PURPOSE: VERIFY RELATED SERVICE INFORMATION AVAILABILITY • Verify related Service Information availability. • Is any related Service Information available?	Yes	Perform repair or diagnosis according to the available Service Information. • If the vehicle is not repaired, go to the next step.
1		No	Go to the next step.
2	PURPOSE: RECORD VEHICLE STATUS AT TIME OF DTC DETECTION TO UTILIZE WITH REPEATABILITY VERIFICATION Note • Recording can be facilitated using the screen capture function of the PC. • Record the FREEZE FRAME DATA/snapshot data on the repair order.	—	Go to the next step.
3	PURPOSE: VERIFY RELATED PENDING CODE AND/OR DTC • Switch the ignition off, then ON (engine off). • Perform the Pending Trouble Code Access Procedure and DTC Reading Procedure. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5)].) • Are any other PENDING CODEs and/or DTCs present?	Yes	Go to the applicable PENDING CODE or DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.5)].) Go to the next step.
3		No	Go to the next step.
4	PURPOSE: VERIFY CONFORMITY OF ACTUAL EXHAUST VALVE TIMING AND DETERMINE IF MALFUNCTION IS CAUSED BY OCV OR CONNECTOR RELATED • Start the engine and idle it. • Access the following PIDs using the M-MDS: (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5)].) ― MAF ― IAT • Implement the repeatability verification procedure. (See Repeatability Verification Procedure.) • Does the monitor value of the PID item MAF conform to the IAT PID value?	Yes	Go to the next step.
4		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.
5	PURPOSE: VERIFY CONNECTOR CONNECTIONS • Start the engine. • Access the MAF and IAT PID using the M-MDS. (See ON-BOARD DIAGNOSTIC TEST [PCM (SKYACTIV-G 2.5)].) • Does the PID value fluctuate when the following connectors are shaken? ― MAF sensor/IAT sensor No.1 ― PCM	Yes	Repair or replace the applicable wiring harness or connector parts. Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 7.
5		No	Go to Troubleshooting Diagnostic Procedure to perform the procedure from Step 1.

STEP	INSPECTION	RESULTS	ACTION
1	INSPECT INSTALLATION OF MAF SENSOR/IAT SENSOR NO.1 • Inspect installation of MAF sensor/IAT sensor No.1. • Is the MAF sensor/IAT sensor No.1 installed securely?	Yes	Go to the next step.
1		No	Retighten the MAF sensor/IAT sensor No.1, then go to Step 9. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.1 REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
2	INSPECT MAF SENSOR/IAT SENSOR NO.1 CONNECTOR CONDITION • Disconnect the MAF sensor/IAT sensor No.1 connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
2		No	Go to the next step.
3	INSPECT PCM CONNECTOR CONDITION • Disconnect the PCM connector. • Inspect for poor connection (such as damaged/pulled-out pins, corrosion). • Is there any malfunction?	Yes	Repair or replace the connector and/or terminals, then go to Step 9.
3		No	Go to the next step.
4	INSPECT MAF SENSOR/IAT SENSOR NO.1 CIRCUIT FOR SHORT TO GROUND • Verify that the MAF sensor/IAT sensor No.1 and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side) and body ground: ― MAF sensor/IAT sensor No.1 terminal B ― MAF sensor/IAT sensor No.1 terminal C • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE • MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to ground. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to ground. Go to Step 9.
4		No	Go to the next step.
5	INSPECT MAF SENSOR/IAT SENSOR NO.1 CIRCUIT FOR OPEN CIRCUIT • Verify that the MAF sensor/IAT sensor No.1 and PCM connectors are disconnected. • Inspect for continuity between the following terminals (wiring harness-side): ― MAF sensor/IAT sensor No.1 terminal A—PCM terminal 2AI ― MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE ― MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT • Is there continuity?	Yes	Go to the next step.
5		No	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • MAF sensor/IAT sensor No.1 terminal A—PCM terminal 2AI • MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE • MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for an open circuit. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has an open circuit. Go to Step 9.
6	INSPECT MAF SENSOR/IAT SENSOR NO.1 SIGNAL CIRCUIT FOR SHORT TO POWER SUPPLY • Verify that the MAF sensor/IAT sensor No.1 and PCM connectors are disconnected. • Switch the ignition ON (engine off). Note • Another DTC may be stored by the PCM detecting an open circuit. • Measure the voltage at the MAF sensor/IAT sensor No.1 terminal B (wiring harness-side). • Is the voltage 0 V?	Yes	Go to the next step.
6		No	Refer to the wiring diagram and verify whether or not there is a common connector between MAF sensor/IAT sensor No.1 terminal B and PCM terminal 2BE. If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to power supply. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to power supply. Go to Step 9.
7	INSPECT MAF SENSOR/IAT SENSOR NO.1 CIRCUITS FOR SHORT TO EACH OTHER • Verify that the MAF sensor/IAT sensor No.1 and PCM connectors are disconnected. • Inspect for continuity between MAF sensor/IAT sensor No.1 terminals A, C and B (wiring harness-side). • Is there continuity?	Yes	Refer to the wiring diagram and verify whether or not there is a common connector between the following terminals: • MAF sensor/IAT sensor No.1 terminal A—PCM terminal 2AI • MAF sensor/IAT sensor No.1 terminal B—PCM terminal 2BE • MAF sensor/IAT sensor No.1 terminal C—PCM terminal 2AT If there is a common connector: • Determine the malfunctioning part by inspecting the common connector and the terminal for corrosion, damage, or pin disconnection, and the common wiring harness for a short to each other. • Repair or replace the malfunctioning part. If there is no common connector: • Repair or replace the wiring harness which has a short to each other. Go to Step 9.
7		No	Go to the next step.
8	INSPECT MAF SENSOR/IAT SENSOR NO.1 • Inspect the MAF sensor/IAT sensor No.1. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [SKYACTIV-G 2.5].) (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [SKYACTIV-G 2.5].) • Is there any malfunction?	Yes	Replace the MAF sensor/IAT sensor No.1, then go to Step 9. (See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.1 REMOVAL/INSTALLATION [SKYACTIV-G 2.5].)
8		No	Go to the next step.
9	VERIFY DTC TROUBLESHOOTING COMPLETED • Always reconnect all disconnected connectors. • Clear the DTC from the PCM memory using the M-MDS. (See CLEARING DTC [PCM (SKYACTIV-G 2.5)].) • Perform the KOEO or KOER self test. (See KOEO/KOER SELF TEST [PCM (SKYACTIV-G 2.5)].) • Is the same Pending DTC present?	Yes	Repeat the inspection from Step 1. • If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G 2.5].) Go to the next step.
9		No	Go to the next step.
10	VERIFY AFTER REPAIR PROCEDURE • Perform the “AFTER REPAIR PROCEDURE”. (See AFTER REPAIR PROCEDURE [PCM (SKYACTIV-G 2.5)].) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-G 2.5)].)
10		No	DTC troubleshooting completed.