Honda Civic Service Manual page 395

I
Intake Air Temperature (lATl Sensor
The scan tool indicates Diagnostic Trouble Code {DTC) P0112: A low voltage (high temperature) problem in the
lntake Air Temperature (lAT) sensor circuit.
RESISTANCE IKOI
.-l
* 2 : l f t h e e n g i n e i s w a r m , i t w i l l b e
higher than ambient temPerature.
IAT SENSOR 2P CONNECTOR {C112)
. a2 .. toa rra rrl l:rt t.al
20 0 20 ro ao ao too t2ot.cl
INTAXIE AIR TEMPEFATURE
IAT
{RED/YEL)
t e r m r n a r s
-+-r
I ' l ' l
-_T-
I
=
Wire side of female
The MIL has been Teported on.
DTC P0112 is stored.
Problem verification:
1. Turnthe ignition switch ON 1ll)
2. Check the IAT with the scan
tool-
ls 302'F (150"C) or hagher (or
H Limit in Honda mode ot
PGM Tester) or 0 V indicated?
ls the correct ambrent temper
ature indicatedi' ?
Roolac€ tho IAT 3ensor.
lntermittent failure, svstom is OK
6t this tim€. Check for Poor Gon-
nections or loos€ wires st C112
{lAT.en3orl and ECM/PCM.
Check tor a shon in the IAT sen-
sor:
1. Disconnect the IAT sensor con
nector.
2. Check the IAT with the scan
tool.
l s 3 0 2 " F ( 1 5 0 ' C ) o r h i g h e r ( o r
H'Limit in Honda mode of
PGM Tester) or 0 V indicated?
Ch6ck for s short in the wira (lAT
lin€):
1. Turn the ignition switch OFF
2. Disconnect the ECM/PCM con-
nector D (16P) (C (31P))*'.
3. Check for continuity between
the IAT sensor 2P connector ler-
minal No. 2 and body ground.
Reoair short in the wire bstween
ECM/PCM tD8 (c25)'1) and IAT
Substitute a known-good ECM/
PCM and recheck. It normel IAT
is indicated, replace the original
ECM/PCM.
* l : ' 9 9 - 0 O m o d e l s e x c e p t D l 6 Y 5 e n g i n e w i t h M / T -
r f ,
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