DTC P0098-00: IAT Sensor No. 2 Circuit High Input: Notes

DTC DETECTION DESCRIPTION

DTC P0098:00	IAT sensor No. 2 circuit high input
DETECTION CONDITION	If the PCM detects that the IAT sensor No. 2 voltage at the PCM terminal 1CE is 4.96 V or more for 5 s, the PCM determines that the IAT sensor No. 2 circuit voltage is high. Diagnostic support note This is a continuous monitor (CCM). The check engine light illuminates if the PCM detects the above malfunction condition during the first drive cycle. FREEZE FRAME DATA/Snapshot data is available. DTC is stored in the PCM memory.
FAIL-SAFE FUNCTION	Not applicable
POSSIBLE CAUSE	MAP sensor/IAT sensor No. 2 connector or terminals malfunction PCM connector or terminals malfunction IAT sensor No. 2 malfunction Short to power supply in wiring harness between MAP sensor/IAT sensor No. 2 terminal B and PCM terminal 1CE Open circuit in wiring harness between the following terminals: MAP sensor/IAT sensor No. 2 terminal B-PCM terminal 1CE MAP sensor/IAT sensor No. 2 terminal A-PCM terminal 1BX PCM malfunction

Fig 1: IAT Sensor No 2 Connector Terminals

Courtesy of MAZDA MOTORS CORP.

CAUTION:

• Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

PARTS DESCRIPTION

Item	Definition	Unit	Condition/Specification
IAT2	Intake air temperature (No. 2) input from IAT sensor No. 2	°C, °F	Displays IAT (No. 2)
	IAT sensor No. 2 voltage	V	IAT2 is 20 °C {68 °F}: Approx. 3.57 V IAT2 is 40 °C {104 °F}: Approx. 2.70 V IAT2 is 60 °C {140 °F}: Approx. 1.87 V