p0300, p0135,p0121 help!

[white99ta]

These codes showed up after I put my new transmission (4l60) in my 1999 trans am. I had the battery disconnect but had to reconnect it before it was done to roll up the Windows( didn't have the rite tc bolts so had to finish the next day, I was at my hobby shop on base) anyway I connected the batt and forgot it was connected and arced out the starter. Don't no if that has anything to do with the problem but now the lights flicker. I know I gotta replace the alternater but could that or the fact that I put a high stall converter along witg my cam be the reason I'm throwing the p0300? The car hasnt lost any power and seems to run completely fine. It feels like their is a small vacuum leak but chexked and came up with nothing. Thanks in advanced

[WWhittle]

These codes showed up after I put my new transmission (4l60) in my 1999 trans am. I had the battery disconnect but had to reconnect it before it was done to roll up the Windows( didn't have the rite tc bolts so had to finish the next day, I was at my hobby shop on base) anyway I connected the batt and forgot it was connected and arced out the starter. Don't no if that has anything to do with the problem but now the lights flicker. I know I gotta replace the alternater but could that or the fact that I put a high stall converter along witg my cam be the reason I'm throwing the p0300? The car hasnt lost any power and seems to run completely fine. It feels like their is a small vacuum leak but chexked and came up with nothing. Thanks in advanced

Is that a cylinder misfire code?

[MARTYROBBINS]

P0121 Circuit Description

The Throttle Position (TP) sensor is a potentiometer. The TP sensor is mounted to the left side of the throttle body. The TP sensor provides a voltage signal that changes relative to throttle blade angle. This signal voltage is one of the most important inputs used by the PCM. The TP sensor has a 5.0 volt reference, a ground and a signal circuit.

The TP sensor Signal voltage should be near 0.6 volt at idle. The TP sensor voltage should increase to above 4.0 volts at wide open throttle (WOT). This diagnostic compares actual throttle position from the TP sensor to a predicted throttle position value. The predicted throttle position is calculated from engine speed and other inputs. If the PCM detects the predicted throttle position is below the actual TP sensor value, this DTC sets.

Conditions for Running the DTC



No MAP sensor or TP sensor DTCs set.
The engine run time is greater than 10 seconds.
The engine coolant temperature is greater than 0??C (32??F).
The IAC is between 0 and 255 counts.
The MAP is less than 55 kPa. OR
The MAP is greater than 65 kPa.
MAP steady.
Conditions for Setting the DTC



The predicted throttle angle does not match the actual throttle angle.
All conditions present for 20 seconds.
Action Taken When the DTC Sets



The PCM illuminates the Malfunction Indicator Lamp on the second consecutive ignition cycle that the diagnostic runs and fails.
The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure records.
Conditions for Clearing the MIL/DTC



The PCM turns the MIL OFF after three consecutive ignition cycles that the diagnostic runs and does not fail.
A last test failed (current DTC) clears when the diagnostic runs and does not fail.
A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
Use a scan tool in order to clear the MIL/DTC.
Diagnostic Aids

Important:


Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
For any test that requires probing the PCM or component harness connectors, use the Connector Test Adapter kit J 35616-A. Using this kit prevents any damage to the harness connector terminals. Refer to Using Connectors Test Adapters in Diagrams.
The following may cause an intermittent:
Mis-routed harness
Rubbed through wire insulation
Broken wire inside the insulation
The PCM 5.0 volt reference circuits are internally connected within the PCM. If all the TP sensor circuits are OK, inspect the MAP sensor and EGR valve for malfunctions.
If it is determined that the DTC occurs intermittently, performing the DTC P1121 diagnostic table may isolate the cause of the fault.
Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This isolates when the DTC failed.
For an intermittent, refer to Symptoms. See: Symptom Related Diagnostic Procedures
Test Description

The numbers below refer to the step numbers on the diagnostic table.



If DTC P1635 sets at the same time, this indicates that the 5 volt reference circuit is either shorted to a ground or shorted to a voltage. The 5 volt reference circuit is internally connected within the PCM.
The MAP value should change with the engine speed. If a MAP sensor voltage changes, there is no malfunction with the MAP sensor.
This step tests for an intermittent connection at the sensor.
The MAP sensor is difficult to remove. Twist the MAP sensor forward and pull up. This forward motion clears the retaining clip.
If the TP sensor voltage changes, there is no malfunction with the TP sensor wiring or the PCM.
Using Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicated the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This isolates when the DTC failed.
This tests the 5 volt reference circuit, signal circuit, and the PCM. If the scan tool displayed 5 volts, the TP sensor circuits are OK.

[MARTYROBBINS]

P0135 Circuit Description

The PCM supplies a bias voltage (approximately 450 mV) on the Heated Oxygen Sensor (HO2S) signal high and low circuits. When you turn the ignition to the ON position, battery voltage is supplied to the HO2S heater. As the heater reaches the operating temperature, the HO2S voltage responds by changing from a bias voltage range to the normal operation. Typically, as the HO2S reaches the operating temperature, the HO2S voltage goes from a bias voltage to a voltage below 300 mV. Depending on the exhaust gas content, it is possible for the HO2S voltage to go above 450 mV.

The PCM runs the heater test only on a cold start (depends on the cumulative air flow) and only once an ignition cycle. When you start the engine the PCM monitors the HO2S voltage. When the HO2S voltage goes above or below the bias range threshold, the PCM determines how much time it took. If the PCM detects that the process took too much time for the HO2S to enter into normal operating range, this DTC sets. The time the process takes the HO2S to reach operating temperature is based on the amount of air that flows into the engine.

Conditions for Running the DTC



DTCs P0101, P0102, P0103, P0112, P0113, P0117, P0118, P0121, P0122, P0123, P0125, P0200, P0335, P0336, P0351-P0358, P1258 not set.
The intake air temperature and the engine coolant temperature are less than 50??C (122??F) and are within 8??C (14.5??F) of each other at engine start-up.
The ignition voltage is between 10.0 volts and 18.0 volts.
The AIR, EGR, and the Catalyst diagnostics are not active.
Conditions for Setting the DTC

The HO2S voltage remains between 300 mV and 700 mV for a predetermined amount of time (depends on engine coolant temperature and air flow).

Action Taken When the DTC Sets



The PCM illuminates the Malfunction Indicator Lamp on the second consecutive ignition cycle that the diagnostic runs and fails.
The PCM records the operating conditions at the time the diagnostic fails. The first time the diagnostic fails, the PCM stores this information in the Failure Records. If the diagnostic reports a failure on the second consecutive ignition cycle, the PCM records the operating conditions at the time of the failure. The PCM writes the conditions to the Freeze Frame and updates the Failure records.
Conditions for Clearing the MIL/DTC



The PCM turns the MIL OFF after three consecutive ignition cycles that the diagnostic runs and does not fail.
A last test failed (current DTC) clears when the diagnostic runs and does not fail.
A History DTC clears after forty consecutive warm-up cycles, if this or any other emission related diagnostic does not report any failures.
Use a scan tool in order to clear the MIL/DTC.
Diagnostic Aids

Important:


Remove any debris from the PCM connector surfaces before servicing the PCM. Inspect the PCM connector gaskets when diagnosing/replacing the PCM. Ensure that the gaskets are installed correctly. The gaskets prevent contaminant intrusion into the PCM.
For any test that requires probing the PCM or component harness connectors, use the Connector Test Adapter Kit J 35616-A. Using this kit prevents any damage to the harness connector terminals. Refer to Using Connectors Test Adapters in Diagrams.
The heater diagnostic only runs on a cold start and runs once per ignition cycle.
An oxygen supply inside the HO2S is necessary for proper operation. The HO2S wires provides the supply of oxygen. Inspect the HO2S wires and connections for breaks or contamination.
Using the Freeze Frame and/or Failure Records data may aid in locating an intermittent condition. If you cannot duplicate the DTC, the information included in the Freeze Frame and/or Failure Records data can help determine how many miles since the DTC set. The Fail Counter and Pass Counter can also help determine how many ignition cycles the diagnostic reported a pass and/or a fail. Operate the vehicle within the same freeze frame conditions (RPM, load, vehicle speed, temperature etc.) that you observed. This isolates when the DTC failed.
For an intermittent condition, refer to Symptoms. See: Symptom Related Diagnostic Procedures
Test Description

The numbers below refer to the step numbers on the diagnostic table.



Allow the engine to cool before performing this test. If the sensor is at the operating temperature the HO2S voltage will stay high or low. If the HO2S voltage stays between 300-700 mV indicates the HO2S heater is inoperative.
If more than one HO2S DTC is set, this is a good indication that the HO2S fuse is open. Test all the related circuits going to all the heated oxygen sensors for a short to ground. If all the wiring is OK, it may be necessary to disconnect each HO2S one at a time to locate a shorted sensor.
This step verifies whether a B+ supply is available at the sensor.
This step verifies whether a ground is available at the sensor.
This step verifies whether the HO2S heater element is internally open.
Inspect the ignition feed circuits at the Underhood Electrical Center for poor connections.
Test the ground circuits for an open if more then one heater DTC sets.

[MARTYROBBINS]

And the p0300 is most likeley from the cam have you hd it tuned yet?

[MARTYROBBINS]

i have a good aftermarket scanner if you need help let me know

[white99ta]

Hey I appreciate the quick response. Yes the car is tuned and p0300 is random/ multiple cyl misfire. the car is still running great. I'm very frustrated over all of this. If you're willing to help ill pay you. Anyone else just has no idea so any progress would be great. I'll be in Charleston tomorrow.

[MARTYROBBINS]

Well you can come by my work or the house after 5 but i can look at it at worki am at altman suzuki on the corner of rivers and remount

[white99ta]

Ok I get off work tomorrow am at 730am then I have a safety brief at 1130am for some time off I got( Im a active duty Marine) for presidents day. Somewhere in there I have to get new tires. So I should be up in Charleston around 2 or 3pm. Just let me know what's better for you. I really appreciate your help.

[MARTYROBBINS]

Don't matter i will be here all day and i only live like 4 miles from work so just let me know