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1999 Chevy Astro Van smog faliure
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autohemi@yahoo.com
New User
Aug 4, 2007, 12:34 PM
Post #1 of 2
(5833 views)
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1999 Chevy Astro Van smog faliure
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I have the tool to check codes. the code coming up is:
P0113 IAT Sensor 1 Circuit High Input.
I went to the auto parts and they sold me a $15.00 part that didn't fix the problem. What is the best way to trouble shoot this problem? Is there a good emissions manual or better yet somewhere freeeeeeeee on line? Or do I just do what my cousin suggested and take it to the dealer so they can put it on a machine? I like the do it your self kind of stuff better.
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Indytech
User
Sep 24, 2007, 8:39 PM
Post #2 of 2
(5792 views)
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Re: 1999 Chevy Astro Van smog faliure
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This one should be left to us in the dealership but i will give you a chance in doing it your self
Codes that get read for you at auto zone and such places will give you a code from there cheap code readers
like what you have P0113 IAT Sensor 1 Circuit High Input this does not mean you have to buy the aforementioned part to clear the code there is sometime more to it than you can believe.
I will give you a extract from a shop repair manual if you understand it go ahead but believe me
you will be better off taking it to the repair shop if this is not your line of work
DTC P0113 - IAT SENSOR CIRCUIT HIGH VOLTAGE
Circuit Description Intake Air Temperature (IAT) sensor is a thermistor that varies resistance based on temperature.
As temperature of sensor increases, resistance decreases.
Low temperature will result in a high signal voltage.
Conditions for setting DTC:
No ECT, MAF or VSS sensor related DTCs.
Vehicle speed is less than 2 MPH.
MAF value is less than 250 gm/s.
ECT is greater than 84.7°F (29.3°C).
Engine run time greater than 100 seconds.
Diagnostic Procedures 1.Perform POWERTRAIN ON-BOARD DIAGNOSTIC (OBD) SYSTEM CHECK .
Retrieve and record FREEZE FRAME and/or FAIL RECORDS data for each DTC set.
After performing OBD system check, go to next step.
2. Start and allow engine to idle. Using scan tool, read IAT sensor voltage. If voltage is greater than 4.9 volts, go to next step. If voltage is not greater than 4.9 volts, go to step 6).
3. Turn engine off. Turn ignition on. Disconnect IAT sensor harness connector. Connect a jumper wire across IAT sensor harness connector. If voltage is less than 0.82 volt, go to step 5). If voltage is not less than 0.82 volt, go to next step.
4. Connect jumper wire between IAT sensor harness connector signal circuit and chassis ground. If voltage is less than 0.82 volt, go to step 8). If voltage is not less than 0.82 volt, go to step 9).
5. Check voltage between IAT sensor signal circuit and a known-good ground. If voltage reading is greater than 5.2 volts, go to step 10). If voltage reading is not greater than 5.2 volts, go to next step.
6. DTC is intermittent. Check if any additional DTCs are set. Diagnose affected DTCs. If no additional DTCs are set, see DIAGNOSTIC AIDS.
7. Inspect VCM and IAT sensor for proper connection. If a problem is found, go to step 11). If connections are okay, go to step 12).
8. Check IAT sensor harness connector ground circuit for open between VCM and IAT sensor. If circuit is open, go to step 11). If circuit is okay, go to step 13).
9. Check IAT sensor harness connector signal circuit for open between VCM and IAT sensor. If circuit is open, go to step 11). If circuit is okay, go to step 13).
10. Repair short to voltage in IAT sensor signal circuit. After repairs, go to step 14).
11. Repair circuit as necessary. After repairs, go to step 14).
12. Replace IAT sensor. After replacing sensor, go to step 14).
13. Replace VCM. Program replacement VCM using required equipment. After replacing VCM, go to next NOTE: For circuit reference, see L - WIRING DIAGRAMS article.
Indy
,
http://www.flatratetech.com
staff tech
Indy Shop owner
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