Diagnostic Trouble Code (Dtc) P0113 Intake Air Temperature (Iat) Sensor Circuit High Input - Isuzu 1999 RODEO Workshop Manual

DIAGNOSTIC TROUBLE CODE (DTC) P0113 INTAKE AIR TEMPERATURE (IAT)
Circuit Description
The intake air temperature (IAT) sensor is a thermistor
which measures the temperature of the air entering the
engine. The powertrain control module (PCM) applies 5
volts through a pull–up resistor to the IAT sensor. When
the intake air is cold, the sensor resistance is high and the
PCM will monitor a high signal voltage on the IAT signal
circuit. If the intake air is warm, the sensor resistance is
lower causing the PCM to monitor a lower voltage.
Diagnostic Trouble Code P0113 will set when the PCM
detects an excessively high signal voltage on the intake
air temperature sensor signal circuit. DTC P0113 is a
Type A Code.
Conditions for Setting the DTC
f The engine has been running for over 4 minutes.
f Vehicle speed is less than 32 km/h (20 mph).
f ECT signal temperature is above 60°C (140°F).
f Mass air flow is less than 20g/second.
f IAT signal voltage almost 5 volts which indicates an
intake air temperature less than –39°C (–38°F) for a
total of 12.5 seconds over a 25–second period.
Action Taken When the DTC Sets
f The PCM will illuminate the malfunction indicator lamp
(MIL) the first time the fault is detected.
f The PCM will use a default IAT valve based on PCM
inputs and engine run time.
RODEO X22SE 2.2L ENGINE DRIVEABILITY AND EMISSION
SENSOR CIRCUIT HIGH INPUT
f The PCM will store conditions which were present
when the Diagnostic Trouble Code was set as Freeze
Frame and in the Failure Records data.
Conditions for Clearing the MIL/DTC
f The PCM will turn the MIL OFF on the third consecutive
trip cycle during which the diagnostic has been run and
the fault condition is no longer present.
f A history Diagnostic Trouble Code P0113 will clear
after 40 consecutive warm–up cycles have occurred
without a fault.
f Diagnostic Trouble Code P0113 can be cleared by
using the Scan Tool's "Clear Info" function.
Diagnostic Aids
Check for the following conditions:
f Poor connection at PCM – Inspect harness connectors
for backed–out terminals, improper mating, broken
locks, improperly formed or damaged terminals, and
poor terminal–to–wire connection.
f Damaged harness – Inspect the wiring harness for
damage, shorts to ground, shorts to battery positive,
and open circuits. If the harness appears to be OK,
observe the IAT display on the Tech 2 while moving
connectors and wiring harnesses related to the IAT
sensor. A change in the IAT display will indicate the
location of the fault.
If Diagnostic Trouble Code P0113 cannot be duplicated,
the information included in the Failure Records data can
6E1–123
D06RX043