Honda CR-V 1997 Service Manual page 298

PGM-FI System
Intake Air Temperature (lAT) Sensor (cont'd)
t
P0112
t
The scan tool indicates Diagnostic Trouble Code (DTC) PO"2: A low voltage (high temperature) problem in the
Intake Air Temperature (lAT) sensor circuit.
The IAT Sensor is a temperature dependant resistor (thermistor), The resistance of the thermistor decreases as the intake
air temperature increases as shown below.
- The MIL has been reported on.
- OTC P0112 is stored.
- Or from Probable Cause List.
Problem verification:
1. Turn the ignition switch ON
(II).
2. Check the fAT with the scan
tool.
Is 302<>F (1S0°C) or higher (o r NO
H·Limit in Honda mode of
r ---- --- ----,
PGM Tester) or a
v
ind icated?
YES
Check for a short in the IAT sen-
sor:
1. Disconnect the fAT sensor 2P
connector.
2. Check the fAT with the scan
tool.
Is 302°F (150°C) or higher (or
H·limit in Honda mode of
PGM Tester)
or
0 V indicated?
YES
Check for a short in the wire IIAT
linel:
1. Turn the ig nition switch OFF.
2. Disconnect the
ECM/PCM
con-
nector
(D
(16P), C (31P)").
3. Check for continuity between
the IAT sensor 2P connector ter-
minal No.2 and body ground.
Is there continuity?
NO
Substitute a known-good ECM/
PCM and recheck. If normal IAT
is indicated, replace the original
ECMIPCM.
*.
'98 - 00 models
11-96
NO
YES
[s the correct ambient temper-
ature indicated"l?
YES
Intermittent failure. system Is OK
at this time. Check for poor con-
nections or loose wires at C133
IIAT sensorland
at
the ECM/PCM.
Replace the IAT sensor.
Repair short in the wire between
the ECM/PCM 108. C25*) and the
IAT sensor.
NO
RESISTANCE IkOi
,.
I.
•
D.'
D.I
I\.
"'
'\
""-
~
~
- 4 3.1 . . 104 " . 2\2 2'- ,' FI
-20 0 20 40 10 10 100 120 (-CI
INTAKE AIR TEMPERATURE
Replace the IAT sensor.
--,: If the engine is warm. it will be high-
er
than ambient temperature .
IAT SENSOR 2P CONNECTOR (C133)
Wire side of female terminals