Iat Sensor Circuit Low Voltage - Honda 2002 Accord Manual

PGM-FI System
DTC Troubleshooting (cont'd)
DTC P0112: IAT Sensor Circuit Low Voltage
1. Turn the ignition switch ON (II).
2. Check the IAT with the scan tool.
Is 302°F (150°C) or higher (or H-Limit in Honda
mode of PGM Tester), or 0 V indicated?
Y E S - G o to step 3.
N O - G o to step 8.
3. Disconnect the IAT sensor connector.
4. Check the IAT with the scan tool.
Is 302°F(150°C) or higher (or H-Limit in Honda
mode of PGM Tester), or 0 V indicated?
Y E S - G o to step 5.
NO—Replace the IAT s e n s o r . •
5. Turn the ignition switch O F F .
6. Disconnect ECM/PCM connector C (31P).
7. Check for continuity between IAT sensor 2P
connector terminal No. 2 and body ground.
I A T S E N S O R 2P C O N N E C T O R
8. Check the temperature reading on the scan tool. Be
aware that if the engine is warm, the reading will
be higher than ambient temperature. If the engine
is cold, the IAT and ECT will have the same value.
Is the correct ambient temperature indicated?
YES-Intermittent failure, system is OK at this time.
Check for poor connections or loose wires at the
IAT sensor and the ECM/PCM. •
NO —Replace the IAT sensor. •
W i r e s i d e o f f e m a l e t e r m i n a l s
Is there continuity?
Y E S —Repair short in the wire between the E C M /
PCM (C25) and the IAT sensor. •
N O - S u b s t i t u t e a known-good ECM/PCM and
recheck (see page 11-5). If normal IAT readings are
indicated, replace the original ECM/PCM. •
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