Dtc P0112: Iat Sensor Circuit Low Voltage - Honda S2000 Service Manual

PGM-FISystem
6 .
7 .
DTC Troubleshooting (cont'dl
DTC P0112: IAT Sensor Circuit Low Voltage
1. Turn the ignition switch ON (ll)
2. Checkthe lATwith the scan lool.
ls302"F (150"C)or higher (or H-Limit in Honda
mode of PGM Tester) or 0 V indicated?
YES- Go to step 3.
NO Go to step 8.
Disconnect the IAT sensor 2P connector.
Check the IAT with the scan tool.
ls 302'F(150'C)or higher (or H-Limit in Honda
mode of PGM Tester)or 0 V indicated?
YES Go to step 5.
NO Replace the IAT sensor.l
Turn the ignition switch OFF.
Disconnect the ECM connector C (31P).
Check the continuity between IAT sensor 2P
connector terminal No, 2 and body ground,
IAT SENSOR 2P CONNECTOR
Wire side of female terminals
ls therc continuity?
YES- Repair short in the wire between the EC|M
(C25) and the IAT sensor. t
NO Substitute a known-good ECM and recheck
(see page 11-5). lf normal IAT is indicated, replace
t h e o r i g i n a l E C M . I
11-46
8. Check the temperature reading on the scan tool. Be
aware that if the engine is warm. the reading will
b e h i g h e r t h a n a m b i e n t t e m p e r a t u r e . l f t h e e n g i n e
is cold, the IAT and ECT will have the same value.
ls the cortect ambient temperature indicated?
YES Intermittent failure, system is OK at this time.
Check for poor connections or loose terminals at
the IAT sensor and at the EClvl.I
NO Replace the IAT sensor. t