Engine Code Help

[Neo_frog]

Ever since I put in my new air filter, my engine has thrown out two codes. I installed it about a year ago and have since lost the stock filter *slaps forehead*.

I'm throwing P0135 and P1193. I don't know how to fix them!

Replacing the O2 sensor should have gotten rid of P0135 and replacing the Intake Temp Sensor should have killed the other one... I can't pass emissions or get plates now and I can't find any more answers.

Does anybody have ALLDATA or something of the sort to give me a hand here???

2002 Chrysler PT Cruiser 2.4L DOHC

Thanks guys.

[Stephen]

how about the wires to the sensors? on my car its common for the wires to have a break at the IAT sensor and the car will turn tracion control off and shift really rough.

[Neo_frog]

how about the wires to the sensors? on my car its common for the wires to have a break at the IAT sensor and the car will turn tracion control off and shift really rough.

As far as wires to the sensors, they seem to be alright. I haven't followed them out from there though.

[ptcary]

Neo,

Here is some info that I found over at the Crew...

did you buy a new IAT or put the old one back in?

I'll do some research on the other code.

1193:

P1193-INLET AIR TEMP SENSOR VOLTAGE HIGH

When Monitored and Set Condition:

P1193-INLET AIR TEMP SENSOR VOLTAGE HIGH

When Monitored: With the ignition on and the engine running.

Set Condition: The inlet air temperature sensor voltage at the PCM goes above 4.9 volts.

POSSIBLE CAUSES

SENSOR GROUND CIRCUIT OPEN

IAT SENSOR SIGNAL CIRCUIT OPEN

IAT SENSOR

IAT SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE

POWERTRAIN CONTROL MODULE

WIRING HARNESS INTERMITTENT

Turn the ignition on.

With the DRB, read the PCM DTCs.

Is the Good Trip Counter for P1193 displayed and equal to zero?

All

Yes ® Go To 2

No ® Go To 7

2 Turn the ignition off.

Disconnect the IAT Sensor harness connector.

Start the engine and allow it to idle.

Measure the voltage of the IAT Sensor Signal circuit.

Is the voltage above 5.5 volts?

Yes ® Repair the IAT Sensor Signal circuit for a short to voltage.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No ® Go To 3

3 Turn the ignition off.

Disconnect the IAT Sensor harness connector.

Turn the ignition on.

With the DRB, monitor the INLET AIR TMP VLT value.

Connect a jumper wire between the IAT Sensor Signal circuit and the IAT Sensor

Ground circuit in the IAT Sensor harness connector.

Note: The voltage should change from greater than 4.5 volts to less than 1.0

volt.

Did the INLET AIR TMP VLT value change from greater than 4.5 volts to less than

1.0 volt?

All

Yes ® Replace the IAT Sensor.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No ® Go To 4

4 Turn the ignition off.

Disconnect the IAT Sensor harness connector.

Measure the resistance between ground and the IAT Sensor Ground circuit.

Is the resistance below 5.0 ohms?

All

Yes ® Go To 5

No ® Repair the IAT Sensor Ground circuit for an open.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

5 Turn the ignition off.

Disconnect the IAT Sensor harness connector.

Disconnect the PCM harness connectors.

Measure the resistance of the IAT Sensor Signal circuit.

Is the resistance below 5.0 ohms?

All

Yes ® Go To 6

No ® Repair the IAT Sensor Signal circuit for an open.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

6 If there are no possible causes remaining, view repair. All

Repair

Replace the Powertrain Control Module.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

7 Turn the ignition off.

Note: Visually inspect the related wiring harness. Look for any chafed,

pierced, pinched, or partially broken wires.

Note: Visually inspect the related wiring harness connectors. Look for

broken, bent, pushed out, or corroded terminals.

Note: Refer to any Technical Service Bulletins (TSB) that may apply.

Perform a wiggle test on the related wiring harnesses with the engine running.

Watch for the Good Trip Counter to change to 0.

Were any problems found?

All

Yes ® Repair wiring harness/connectors as necessary.

Perform POWERTRAIN VERIFICATION TEST VER - 5.

No ® Test Complete.

[jmitch]

my mechanic says

P0135 HO2S Heater Performance Bank 1 Sensor 1

P1193 Inlet air temperature sensor voltage is wrong (Circuit is high)

hope this helps

[toytrkdrvr]

The most common reason to see the IAT code is you might have left the sensor unplugged when you did the air filter. Circuit high is an open in the circuit or unplugged completely.

As far as the O2 code. Its usually the O2 itself. Next common problem is an open on the circuit, usually rodents eating through the wiring.

You replaced parts, did you clear the codes and then retest for smog? Are your OBD monitors run? That would cause a failure too.

I can help later, if you still need it.

ASE Master Tech and Chrysler Master Electrical Technician for too long.

Edited November 29, 2008 by toytrkdrvr

[Neo_frog]

Neo,

Here is some info that I found over at the Crew...

Wow thanks a lot! That's the complete diagnostic test isn't it?

I put the old one back in.

[Neo_frog]

The most common reason to see the IAT code is you might have left the sensor unplugged when you did the air filter. Circuit high is an open in the circuit or unplugged completely.

As far as the O2 code. Its usually the O2 itself. Next common problem is an open on the circuit, usually rodents eating through the wiring.

You replaced parts, did you clear the codes and then retest for smog? Are your OBD monitors run? That would cause a failure too.

I can help later, if you still need it.

ASE Master Tech and Chrysler Master Electrical Technician for too long.

I did the On/Forward/Reverse/Off(x4) method and then the ACC/On(x4) and the codes appeared on the odometer. I was under the impression that was an attempt to reset the codes. It didn't work though.

I replaced the O2 sensor (didn't check the harness) and I just put my old IAT back in... It might be broken though.. I'll check tonight when I get off work.

I should have more answers tomorrow! Thanks a lot for the help this saves me so much money.

[ptcary]

I did the On/Forward/Reverse/Off(x4) method and then the ACC/On(x4) and the codes appeared on the odometer. I was under the impression that was an attempt to reset the codes. It didn't work though.

I replaced the O2 sensor (didn't check the harness) and I just put my old IAT back in... It might be broken though.. I'll check tonight when I get off work.

I should have more answers tomorrow! Thanks a lot for the help this saves me so much money.

No the "key dance" will only display the codes, NOT clear them.

To clear them, you would have to disconnect the battery for at least 10 minutes.

I was gonna say, any chance the old sensor has been laying around out of the car for a long time and is no good, maybe a new one would help.

I'll keep looking for more info and post any more info that I can find.

I think I remember seeing that you had a second battery where the airbox used to be??? I guess you had no chioce but to run one of those open air filters. PT's don't like the heat that those things are exposed to. Airaid is the best intake for a PT, or you can use a factory PT Turbo airbox lid (smaller).

Did you keep the factory IAT with the intake?

Edited November 29, 2008 by ptcary

[Neo_frog]

No the "key dance" will only display the codes, NOT clear them.

To clear them, you would have to disconnect the battery for at least 10 minutes.

I was gonna say, any chance the old sensor has been laying around out of the car for a long time and is no good, maybe a new one would help.

I'll keep looking for more info and post any more info that I can find.

I think I remember seeing that you had a second battery where the airbox used to be??? I guess you had no chioce but to run one of those open air filters. PT's don't like the heat that those things are exposed to. Airaid is the best intake for a PT, or you can use a factory PT Turbo airbox lid (smaller).

Did you keep the factory IAT with the intake?

I took that second battery out. In the second build, I put the breakers in there instead. And I left the original IAT on the car and put it into the new filter.

I'm gonna try to buy a new one today. Maybe warranty my O2 again and check all my wires.