98 s-10 code p113

Answer 1

0113 Intake Air Temperature Circuit High Input The IAT has told the computer the air temperature is -40 degrees. It can be a faulty IAT sensor, a faulty computer (PCM), or the wiring in between. Until the reading is accurate the computer will use a default value of 140 degrees. The sensor is in the air duct just past the air filter box. Check for a disconnected wire or poor connectionat the sensor. With a scan tool, tests can be conducted to determine the faulty component. Here's what you can do without a scan tool. The IAT is a variable resistor, cold makes it gain resistance. You may check the IAT with an ohmmeter, it should not show 100,700 ohms (unless it's -40 degrees outside). If it shows 100,700 ohms, replace the sensor. 23 degrees is 12,300 ohms. 50 degrees is 5,670 ohms. 86 degrees is 2,238 ohms, 212 degrees is 177 ohms. The code is indicating a very high resistance in the sensor, or an open circuit (broken/disconnected wire), or hopefully not the computer. If the sensor's conductivity does not match the air temperature (it will have some resistance unless it is 262 degrees), check the wires. (Make sure key is turned off at least 10 seconds and remains off before disconnecting/connecting PCM connectors.) The two wires both go into Connector 2 (Black) on the PCM (on the right fender). The signal wire (tan) is pin 20. The ground wire (gray) is pin 28. Use an ohmmeter to check the continuity of each wire. Probe from the tan wire at sensor connector (A) to pin 20 of connector 2. It should have no resistance. Likewise, probe from gray wire at sensor connector (B) to pin 28 of Connector 2. It should have no resistance. If the wires check out, wait a couple of days and see if the light goes out. If not, you can go buy a new IAT sensor (even if it did not have infinite resistance) since the only other option is the big bucks PCM. Or you may take it to the dealer and have them diagnose it. But failing all else I would try as a 2nd to last resort replacing the IAT sensor. Check the connector at the sensor carefully for a bent or backed out pin, corrosion. It most likely is a bad sensor, or a bad connection.