help defining trouble codes

[JohnC]

I got my car scanned at autozone yesterday, because my SES light came on and the motor has been missing alot. Here are the DTC's they pulled up:

History DTC P0113-IAT sensor 1
Circuit High Input (this code came up 3 times on the print out they gave me)- I knew this was going to come up because I accidently damaged the IAT while working under the hood one day.

Transient DTC P0125- Clsd Loop Fuel Ctrl
Insufficient
Coolant Temp

Anybody ever experiance this code. I couldnt find it in my chilton???

Transient DTC P1406
EGR Pintle Position
What options do I have about this one. Do I replace the EGR or Block it off. Would I still be getting a light if I did block it off?

Also got History DTC P1629
Theft Deterrent Sys
Crank Signal
Does the crank sensor need to be replaced?

Im more concerned about the second code I got more than anything else could someone help me out with some of these?

Thanks,
John

[Coriya71]

DTC P0113 Intake Air Temperature (IAT) Sensor Circuit High Voltage
Refer to TP, MAP, MAP, ECT, IAT Sensors Schematic .

Circuit Description
The intake air temperature (IAT) sensor is a thermistor which measures the temperature of the air entering the engine. The PCM applies 5 volts through a pull-up resistor to the IAT sensor. When the intake air is cold, the sensor resistance is high and the PCM will monitor a high signal voltage on the IAT signal circuit. If the intake air is warm, the sensor resistance is lower causing the PCM to monitor a lower voltage. DTC P0113 will set when the PCM detects an excessively high signal voltage on the intake air temperature sensor signal circuit.

Conditions for Setting the DTC
No ECT sensor, MAF sensor or VSS DTC present.
The engine has been running for over 3 minutes.
Vehicle speed is less than 35 mph.
Mass Air Flow is less than 12 gm/s.
Engine Coolant Temperature is greater than 60°C (140°F).
IAT signal voltage indicates an intake air temperature less than -31°C (-24°F).
The above conditions are present for at least 20 seconds.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.
The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool.
Diagnostic Aids
Check for the following conditions:

Poor connection at PCM. Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection. If DTC P0113 cannot be duplicated, the information included in the Fail Records data can be useful in determining vehicle mileage since the DTC was last set.
Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the IAT display on the scan tool while moving connectors and wiring harnesses related to the IAT sensor. A change in the IAT display will indicate the location of the malfunction.
Skewed or mis-scaled IAT Sensor.

DTC P0125 Engine Coolant Temperature (ECT) Excessive Time to Closed Loop Fuel Control
Refer to TP, MAP, MAP, ECT, IAT Sensors Schematic .

Circuit Description
To provide the best possible combination of driveability, fuel economy, and emission control, a closed loop air/fuel metering system is used. When the vehicle is first started, the PCM controls fuel delivery in open loop, ignoring the fuel control heated oxygen sensors (Bank 1 HO2S1 and Bank 2 HO2S 1) signals and calculating air/fuel ratio based on inputs from the engine coolant temperature, throttle position, and mass air flow sensors. The PCM will begin using the fuel control heated oxygen sensor signals for controlling fuel delivery (Closed Loop) when the following conditions have been met:

The fuel control HO2S output signals are varying, indicating that the sensors are hot enough to operate properly.
The Engine Coolant Temperature sensor indicates coolant temperature above 21°C (70°F).
Engine speed has been greater than 1200 RPM for at least 8 seconds.
Time since startup is at least 16 seconds for a warm engine or 50 seconds for a cold engine.
Conditions for Setting the DTC
No IAT or ECT sensor DTC(s) present
Vehicle speed is greater than 5 mph.
Intake air temperature is greater than 10°C (50°F).
Engine coolant temperature is greater than 0°C (32°F).
Startup engine coolant temperature is less than 21°C (70°F).
Engine coolant temperature sufficient to allow Closed Loop operation (20°C /68°F) is not achieved within 2 minutes of startup.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.
The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool.
Diagnostic Aids
The DTC P0125 diagnostic test will not run if the engine is started while the coolant temperature is less than 0°C (32°F) or greater than 21°C (70°F). If it is not possible to operate the vehicle under the apprpriate conditions, check the following items:

Cooling system coolant level - Refer to Cooling and Radiator
Thermostat operation - Refer to Cooling and Radiator .
Cooling fans operation - Refer to Electric Cooling Fan Diagnosis .
Check for high resistance in wiring related to the ECT sensor. Also, check for poor connections at ECT sensor and PCM (refer to Troubleshooting Procedures in Electrical Diagnosis).
DTC P0125 set indicates a skewed ECT sensor. Comparing the engine coolant temperature displayed on a scan tool with actual coolant temperature measured with a thermometer may isolate this condition. If the displayed engine coolant temperature is not close to the actual coolant temperature, replace the ECT sensor.
Poor connection at PCM - Inspect harness connectors for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Damaged harness - Inspect the wiring harness for damage. If the harness appears to be OK, observe the display on the scan tool while moving connectors and wiring harnesses related to the sensor. A change in the display will indicate the location of the fault

DTC P1406 Exhaust Gas Recirculation (EGR) Position Sensor Performance




Circuit Description
The PCM monitors the EGR valve pintle position input to ensure that the valve responds properly to commands from the PCM and to detect a malfunction if the pintle position sensor and control circuits are open or shorted. If the PCM detects a pintle position signal voltage outside the normal range of the pintle position sensor, or a signal voltage that is not within a tolerance considered acceptable for proper EGR system operation, the PCM will set DTC P1406.

Conditions for Setting the DTC
EGR Feedback is less than 0.14 volt at any time.
OR

EGR Feedback is 0.4 volt greater or less than the EGR Closed Valve Pintle Position when the Desired EGR Pos is commanded to 0%.
OR

Actual EGR Pos is 10% greater or less than the Desired EGR Pos.
Any of the above conditions present for longer than 20 seconds.
Action Taken When the DTC Sets
The PCM will illuminate the malfunction indicator lamp (MIL) during the second consecutive trip in which the diagnostic test has been run and failed.
The PCM will store conditions which were present when the DTC set as Freeze Frame and Failure Records data.
Conditions for Clearing the MIL/DTC
The PCM will turn OFF the MIL during the third consecutive trip in which the diagnostic has been run and passed.
The History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool.
Diagnostic Aids
Check for the following conditions:

Open EGR ignition filter circuit. An open in the EGR ignition filter circuit will cause erratic EGR Position Error readings while the EGR valve is operating. With the ignition ON, a test light should illuminate when connected between ground and the EGR ignition filter circuit at the PCM connector. If not, locate and repair the open in the EGR ignition filter circuit.
Excessive deposits on EGR valve pintle or seat. Check for deposits that may interfere with the EGR valve pintle extending completely or cause the pintle to stick.
Poor connection or damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, observe the EGR actual position display on the scan tool while moving connectors and wiring harnesses related to the EGR valve. A change in the display will indicate the location of the malfunction.
EGR Valve Icing. EGR valve icing can occur during cold ambient conditions. An EGR valve icing condition will affect EGR system operation by causing the pintle to stick in the closed position. If DTC P1406 sets, EGR system operation may be inhibited for the remainder of the trip.


DTC P1629 Theft Deterrent Fuel Enable Signal Not Received




Circuit Description
The body control module produces the Theft Deterrent Fuel Enable signal when ignition is ON and the proper key resistor pellet is sensed by the body control module. The PCM monitors the Fuel Enable signal during crank. If the proper signal is present on the Theft Deterrent Fuel Enable circuit, the PCM enables fuel delivery to allow the engine to start. If the PCM detects that the fuel enable signal is not present or incorrect while an attempt is made to start the engine, DTC P1629 will be set. The engine will not start as long as this condition is present. If the problem also affects inputs to the body control module, the starter motor may be disabled. If this condition is present, refer to Vehicle Theft Deterrent System for further diagnosis.

Conditions for Setting the DTC
DTC P1626 is not present.
An attempt is made to start the engine.
The PCM detects an incorrect signal on the theft deterrent fuel enable circuit.
The above conditions are present for longer than 2 seconds.
Action Taken When the DTC Sets
The PCM will not illuminate the malfunction indicator lamp (MIL).
The PCM will store conditions which were present when the DTC set as Failure Records data only. This information will not be stored as Freeze Frame data.
Conditions for Clearing the MIL/DTC
A History DTC will clear after 40 consecutive warm-up cycles have occurred without a malfunction.
The DTC can be cleared by using the scan tool Clear Info function.
Diagnostic Aids
An intermittent may be caused by a poor connection, rubbed through wire insulation or a wire broken inside the insulation. Check for:

Poor connection. Inspect the PCM and body control module harness and connectors for improper mating, broken locks, improperly formed or damaged terminals, and poor terminal to wire connection.
Damaged harness. Inspect the wiring harness for damage. If the harness appears to be OK, disconnect the vehicle theft deterrent module, turn the ignition ON and observe a digital multimeter connected to the theft deterrent fuel enable circuit at the body control module harness connector while moving connectors and wiring harnesses related to the vehicle theft deterrent system. A change in voltage will indicate the location of the malfunction

[hockeyman]

here we go again ;)

[Coriya71]

Hee Hee........ :D

[JohnC]

that is awesome [img]graemlins/bowdown.gif[/img] [img]graemlins/bowdown.gif[/img] , thanks a bunch!!! How come there isnt a sticky or somthing similiar to define and diagnosis ODB-I and ODB-II codes just how you did. I think it would benefit us all, and save time from using the search button. Also where exactly could I get those same diagnosis from? My Haynes manual doesnt exactly break it down like that, not to mention it did'nt even list 2 of the codes mentioned.

[98Camaro3.8]

Originally posted by JohnC:
that is awesome [img]graemlins/bowdown.gif[/img] [img]graemlins/bowdown.gif[/img] , thanks a bunch!!! How come there isnt a sticky or somthing similiar to define and diagnosis ODB-I and ODB-II codes just how you did. I think it would benefit us all, and save time from using the search button. Also where exactly could I get those same diagnosis from? My Haynes manual doesnt exactly break it down like that, not to mention it did'nt even list 2 of the codes mentioned.

It comes out of the GM Factory Service manual set. It was available for download, but was recently removed due to bandwidth constraints. I bought my copy on ebay for about 20 bucks. It comes on 5 or 6 CDs, covers all GM cars from 98+ (96 and 97 are there, but only Engine and Transmission), and is 1,000 times more detailed than a Haynes or Chiltons.

[JohnC]

Originally posted by 98Camaro3.8:
</font><blockquote>quote:</font><hr />Originally posted by JohnC:
that is awesome [img]graemlins/bowdown.gif[/img] [img]graemlins/bowdown.gif[/img] , thanks a bunch!!! How come there isnt a sticky or somthing similiar to define and diagnosis ODB-I and ODB-II codes just how you did. I think it would benefit us all, and save time from using the search button. Also where exactly could I get those same diagnosis from? My Haynes manual doesnt exactly break it down like that, not to mention it did'nt even list 2 of the codes mentioned.

It comes out of the GM Factory Service manual set. It was available for download, but was recently removed due to bandwidth constraints. I bought my copy on ebay for about 20 bucks. It comes on 5 or 6 CDs, covers all GM cars from 98+ (96 and 97 are there, but only Engine and Transmission), and is 1,000 times more detailed than a Haynes or Chiltons. </font>[/QUOTE]Im going to have to pick those up [img]smile.gif[/img]