P0101

The stock systems

Moderator: F9K9

User avatar
KCustom
Crew Elite
Crew Elite
Posts: 301
Joined: Sun Dec 28, 2003 11:35 am
Location: Sand Springs OK
Contact:

P0101

Post by KCustom »

Code P0101...What is it? someone sugested it was a Map sensor code.
2003 Sonoma Crew Cab, Superlift 6", PA 2" BL, KMC XD Enduros, BF Goodrich 315-70-17s, Powerdyne SC, JBA wires,headers and catback, CAI, Crossdrilled & Slotted rotors, Prerunner bar W/ fogs, bed mount spare, Custom rear buckets...
User avatar
HenryJ
Admin K Elite
Admin K Elite
Posts: 12705
Joined: Tue Oct 01, 2002 9:14 pm
Location: Ontario, Oregon
Contact:

Post by HenryJ »

I'd check the MAF sensor, first.
The mass air flow (MAF) sensor is an air flow meter that measures the amount of air entering the engine. The powertrain control module (PCM) uses the MAF sensor signal in order to provide the correct fuel delivery for a wide range of engine speeds and loads. A small quantity of air entering the engine indicates a deceleration or idle. A large quantity of air entering the engine indicates an acceleration or high load condition. The MAF sensor has the following circuits:

* An ignition 1 voltage circuit
* A ground circuit
* A signal circuit

The PCM applies a voltage to the sensor on the signal circuit. The sensor uses the voltage in order to produce a frequency based on inlet air flow through the sensor bore. The frequency varies within a range of around 2,000 Hertz at idle to about 10,000 Hertz at maximum engine load. The PCM uses the following sensor inputs in order to calculate a predicted MAF value:

* The manifold absolute pressure (MAP)
* The intake air temperature (IAT)
* The engine speed (RPM)

The PCM compares the actual MAF sensor frequency signal to the predicted MAF value. This comparison will determine if the signal is stuck based on a lack of variation, or is too low or too high for a given operating condition. DTC P0101 sets if the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value.
Conditions for Running the DTC

* DTCs P0102, P0103, P0106, P0107, P0108, P0112, P0113, P0121, P0122, P0123, P0335, P0336, P0401, P0440, P0442, P0443, P0446, P0449, P1106, P1107, P1111, P1112, P1121, P1122, and P1441 are not set.
* The engine is running.
* The ignition 1 signal is between 11-18 volts.
* The throttle position (TP) sensor angle is less than 95 percent.
* The change in the TP sensor angle is less than 5 percent.
* The MAP sensor is less than 80 kPa.
* The change in the MAP sensor is less than 3 kPa.
* The above conditions are met for 1.5 seconds.

Conditions for Setting the DTC

The PCM detects that the actual MAF sensor frequency signal is not within a predetermined range of the calculated MAF value for more than 4.0 seconds.
Diagnostic Aids

Inspect for the following conditions:

* An incorrectly routed harness. Inspect the harness of the MAF sensor in order to verify that it is not routed too close to the following components:
o The secondary ignition wires or coils
o Any solenoids
o Any relays
o Any motors
* The throttle plate for sticking, or for deposits on the throttle plate or in the throttle bore.
* A low minimum air rate through the sensor bore may cause this DTC to set at idle or during deceleration. Inspect for any vacuum leaks downstream of the MAF sensor.
* A wide open throttle (WOT) acceleration from a stop should cause the MAF sensor g/s display on the scan tool to increase rapidly. This increase should be from 6-12 g/s at idle to 130 g/s or more at the time of the 1-2 shift. If the increase is not observed, inspect for a restriction in the induction system or the exhaust system.
* The barometric pressure that is used in order to calculate the predicted mass air flow value is initially based on the MAP sensor at key ON. When the engine is running the MAP sensor value is continually updated near wide open throttle. A skewed MAP sensor will cause the calculated mass air flow value to be inaccurate. The value shown for the MAP sensor display varies with the altitude. With the ignition ON and the engine OFF, 103 kPa is the approximate value near sea level. This value will decrease by approximately 3 kPa for every 305 meters (1,000 feet) of altitude.
* A high resistance on the ground circuit of the MAP sensor may cause this DTC to set.
* Any loss of vacuum to the MAP sensor may cause this DTC to set.
* A high resistance in the ignition voltage circuit of the MAF sensor may cause this DTC to set.

If you suspect the condition may be related to aftermarket accessories, refer to Checking Aftermarket Accessories in Wiring Systems.
Have you cleaned and oiled that CAI filter lately? Make sure that the CAI you added has not oiled the sensor wires. If it has clean them very carefully.

"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
"Speed is just a matter of Money - How fast do YOU want to go?"-Mechanic from Mad Max-
If at first you don't succeed - Don't take up Skydiving!
- ThunderII KE7CSK
User avatar
KCustom
Crew Elite
Crew Elite
Posts: 301
Joined: Sun Dec 28, 2003 11:35 am
Location: Sand Springs OK
Contact:

question

Post by KCustom »

Would the increase in air flow across the MAF because of the Supercharger cause the code to show up on the Hypertech PPIII. I am not showing a "Check Engine" light, only on the PPIII when it checks for codes....
2003 Sonoma Crew Cab, Superlift 6", PA 2" BL, KMC XD Enduros, BF Goodrich 315-70-17s, Powerdyne SC, JBA wires,headers and catback, CAI, Crossdrilled & Slotted rotors, Prerunner bar W/ fogs, bed mount spare, Custom rear buckets...
User avatar
KCustom
Crew Elite
Crew Elite
Posts: 301
Joined: Sun Dec 28, 2003 11:35 am
Location: Sand Springs OK
Contact:

I think that I found it...

Post by KCustom »

Henry,

I took the MAF off today and cleaned the three sensors very gently and rerouted the breather fronm the passanger side valve cover....it seems to be runing great and no sign of a "light".

Thanks for the help
2003 Sonoma Crew Cab, Superlift 6", PA 2" BL, KMC XD Enduros, BF Goodrich 315-70-17s, Powerdyne SC, JBA wires,headers and catback, CAI, Crossdrilled & Slotted rotors, Prerunner bar W/ fogs, bed mount spare, Custom rear buckets...
User avatar
HenryJ
Admin K Elite
Admin K Elite
Posts: 12705
Joined: Tue Oct 01, 2002 9:14 pm
Location: Ontario, Oregon
Contact:

Post by HenryJ »

Glad to hear it :D

Keep your fingers crossed though. Some codes require a number of failures before setting the light.

"Speed doesn't kill, suddenly becoming stationary does." - Richard Hammond
"Speed is just a matter of Money - How fast do YOU want to go?"-Mechanic from Mad Max-
If at first you don't succeed - Don't take up Skydiving!
- ThunderII KE7CSK