Ote Pol12: Iat Sensor Circuit Low Voltage - Honda Civic 2002-2003 Service Manual

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OTe POl12: 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-Umit in Honda
mode of PGM Tester), or 0 V indicated?
YES-Go to step 3.
NO-Go to step 8.
3. Disconnect the IAT sensor 2P connector.
4. Check the IAT with the scan tool.
Is 302°F(150'C) or higher (or H-Umit in Honda
mode of PGM Tester), or 0 V indicated?
YES-Go to step 5.
NO-Replace the IAT sensor..
5. Turn the ignition switch OFF .
6. Disconnect ECM connector B (24P).
7. Check for continuity between IAT sensor 2P
connector terminal No.2 and body ground.
IAT SENSOR 2P CONNECTOR
Wire side of female terminals
Is there continuity?
YES-Repair short in the wire between the ECM
(BI7) and the IAT sensor .•
NO- Update the ECM if it does not have the latest
software, or substitute a known-good ECM, then
recheck (see page 11-6). If the symptom/indication
goes away with a known-good ECM, replace the
original ECM .•
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 ECTwili 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 terminals at
the IAT sensor and at the ECM .•
NO-Replace the IAT sensor..
11-55