onyxxtreme

iTrader: (4)

P0102 MAF Sensor Circuit Low Frequency

what does this mean? The SES translator seems to be "down".
I just scanned my codes for the first time since i bought the car, and i got a bunch of codes related to the emmissions equipment i removed, but this was the only one i didn't expect....i remember having my SES light come on every once in a while last summer, and i think that this code must be it.

any ideas? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

JRcamaroZ28

iTrader: (41)

TTT for ya cause i just pulled the same code on my way home from the track. so if anyone could shed some light on this it would be appreciated

JR

2001 Pewter WS6

iTrader: (43)

I just has the same thing. Your car isn't reading the air coming in properly. My car would surge, stall and idle rough. It turned out that the sensor fuse in the engine compartment was blown. It is a yellow 20amp fuse. It is in the fuse block closest to the front of the car. If that isn't the problem then look at your MAF wires and clean them and make sure that they aren't broke.

onyxxtreme

iTrader: (4)

thanks for the replies

a month or so back i descreened the MAF, and while i was at it, i took a can of compressed air that electronic technicians use for delicite stuff like that and cleaned the wires inside the MAF with it, so those arent damaged or dirty
and i havent driven it almost at all since i did that

I will check the fuses out for sure, so thanks for that advice <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

btw, with that SES code being thrown, does it effect the power output of the motor, since it supposedly cant read the air properly? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

JRcamaroZ28

iTrader: (41)

Mine turned out to be the fuse but I belive my MAF-T went bad because it blew again soon as i replced it. When i removed the MAF-T it doesn't blow no fuses. Just my luck with the race season here now <img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" />

JR

2001 Pewter WS6

iTrader: (43)

Make sure your MAFT connectors aren't plugged in backwards.

JRcamaroZ28

iTrader: (41)

nope they werent in backwards. i've had the Translator on my car since August '02 and no problems at all.

JR

2001 Pewter WS6

iTrader: (43)

I would see if you could get it repaired under some sort of warranty.

eallanboggs

iTrader: (1)

Your O2s are supposed to switch back and forth at least once a second. I can't remember the exact frequency right now,but it is at least that fast or faster. It needs to cycle above and then below 450 milli volts every second and keep doing that over and over again. If the PCM determinse that it isn't switching quickly enough the code is SET saying you have INSUFFICIENT ACTIVITY. That usually means the O2 is DEGRADED and should be replaced.

CMNTMXR57

Here. <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

P0102

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">DTC P0102 Mass Air Flow (MAF) Sensor Circuit Low Frequency

Circuit Description

The Mass Air Flow (MAF) sensor measures the amount of air ingested by the engine. The direct measurement of the air entering the engine is more accurate than calculating the airflow from the MAP, the IAT, and the engine speed (speed/density). The MAF sensor has a battery feed, a ground, and a signal circuit.

The MAF sensor used on this engine is a hot wire type. This engine uses the MAF sensor in order to measure air flow rate. The MAF output frequency is a function of the power required to keep the air flow sensing elements (hot wires) at a fixed temperature above the ambient temperature. Air flowing through the sensor cools the sensing elements. The amount of cooling is proportional to the amount of air flow. The MAF sensor requires a greater amount of current in order to maintain the hot wires at a constant temperature as the air flow increases. The MAF sensor converts the changes in current draw to a frequency signal read by the PCM. The PCM calculates the air flow (grams per second) based on this signal.

The PCM monitors the MAF sensor frequency. The PCM determines if the sensor is stuck low, stuck high, not providing the airflow value expected for a given operating condition, or that the signal appears to be stuck based on a lack of signal variation expected during the normal operation. This diagnostic tests for too low an airflow rate. This DTC sets when the PCM detects that the MAF sensor frequency is below a predetermined value.

Conditions for Running the DTC

- The engine speed is greater than 300 RPM.
- The system voltage is at least 8.0 volts.

Conditions for Setting the DTC

- The MAF frequency is less than 10 Hz.
- All conditions met for 1 second

Action Taken When the DTC Sets

- The PCM illuminates the malfunction indicator lamp (MIL) 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.
- The PCM utilizes speed density (RPM, MAP, IAT) for fuel management.

Conditions for Clearing the MIL/DTC

- The PCM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail.
- A last test failed, or current DTC, clears when the diagnostic runs and does not fail.
- A history DTC clears after 40 consecutive warm-up cycles, if no failures are reported by this or any other emission related diagnostic.
- Use a scan tool in order to clear the MIL and the 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 water 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 damage to the harness connector terminals. Refer to Using Connector Test Adapters in Wiring Systems.

- The following may cause an intermittent:
- Mis-routed harness
- Rubbed through wire insulation
- Broken wire inside the insulation
- Any un-metered air may cause this DTC to set. Inspect for the following:
- An engine vacuum leak
- The PCV system for vacuum leaks
- An incorrect PCV valve
- The engine oil dip stick not fully seated
- The engine oil fill cap loose or missing
- For an intermittent, refer to Symptoms .

Test Description

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

2) Monitoring the MAF sensor frequency will determine if the fault is present or the malfunction is intermittent.

3) 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.

4) This step tests whether the MAF sensor ignition feed circuit is shorted to a ground. If the fuse is open, repair the circuit as necessary and replace the fuse.

5) This step tests whether the 5.0 volts is available to the MAF sensor signal circuit.

6) This step tests if the signal circuit is shorted to another 5.0 volt reference circuit. If another DTC sets, repair the circuits that are shorted together. If no DTCs set it may be necessary to road test the vehicle.

10) Inspect the fuse 19 for being open. If the fuse is open, inspect the MAF sensor ignition feed circuit for a short to ground.

11) This step verifies whether B+ is available to the MAF sensor.

Step 1

Did you perform the Powertrain On-Board Diagnostic (OBD) System Check?
--
Yes: Go to Step 2
No: Go to Powertrain On Board Diagnostic (OBD) System Check

Step 2

1) Install a scan tool.
2) Idle the engine.
3) Monitor the MAF sensor frequency display on the Engine 2 Data List of the scan tool.

Is the MAF sensor frequency below the specified value?

Specified Value = 10 Hz
--
Yes: Go to Step 4
No: Go to Step 3

Step 3

1) Turn ON the ignition leaving the engine OFF.
2) Review the Freeze Frame and/or Failure Records data for this DTC and observe the parameters.
3) Turn OFF the ignition for 15 seconds.
4) Start the engine.
5) Operate the vehicle within the conditions required for this diagnostic to run, and as close to the conditions recorded in the Freeze Frame/Failure Records as possible. Special operating conditions that you need to meet before the PCM will run this diagnostic, where applicable, are listed in Conditions for Running the DTC.
6) Select the Diagnostic Trouble Code (DTC) option, the Specific DTC option, then enter the DTC number using the scan tool.

Does the scan tool indicate that this diagnostic failed this ignition?
--
Yes: Go to Step 4
No: Go to Diagnostic Aids

Step 4

Is the ENG SEN fuse open?
--
Yes: Go to Step 19
No: Go to Step 5

Step 5

1) Turn OFF the ignition.
2) Disconnect the MAF sensor connector.
3) Turn ON the ignition leaving the engine OFF.
4) Measure the voltage between the MAF sensor signal circuit and the battery ground using the DMM J 39200 . Refer to Measuring Voltage in Wiring Systems.

Is the voltage near the specified value?

Specified Value = 5V
--
Yes: Go to Step 6
No: Go to Step 7

Step 6

Important
If the engine does not start when the MAF sensor signal circuit is grounded, and no additional DTC sets, monitor the scan tool parameters for a sensor value that is not within range. This will aid in locating a short to another 5.0 volt circuit.

1) Turn OFF the ignition.
2) Jumper the MAF sensor signal circuit to battery ground using a fused jumper wire. Refer to Using Fused Jumper Wires in Wiring Systems.
3) Start the engine.

Do any additional DTCs set?
--
Yes: Go to Step 20
No: Go to Step 11

Step 7

1) Turn OFF the ignition.
2) Disconnect the PCM. Refer to PCM Replacement/Programming .
3) Turn ON the ignition leaving the engine OFF.
4) Measure the voltage at the MAF sensor signal circuit at the PCM harness connector using the DMM J 39200 . Refer to Probing Electrical Connectors in Wiring Systems.

Does the DMM display a voltage?
--
Yes: Go to Step 14
No: Go to Step 8

Step 8

1) Turn OFF the ignition.
2) Test for continuity of the MAF sensor signal circuit using the DMM J 39200 . Refer to Testing for Continuity in Wiring Systems.

Does the DMM display OL?
--
Yes: Go to Step 15
No: Go to Step 9

Step 9

Test for continuity of the MAF sensor signal circuit to battery ground using the DMM J 39200 . Refer to Testing for Continuity in Wiring Systems.

Does the DMM display OL?
--
Yes: Go to Step 10
No: Go to Step 16

Step 10

Test for continuity at the PCM harness between the MAF sensor signal circuit and all other circuits at both PCM connectors using the DMM J 39200 . Refer to Testing for Continuity in Wiring Systems.

Does the DMM display OL?
--
Yes: Go to Step 17
No: Go to Step 22

Step 11

Connect the test lamp J 34142-B between the MAF sensor ignition feed circuit and the ground at the MAF sensor harness connector.

Does the test lamp illuminate?
--
Yes: Go to Step 13
No: Go to Step 12

Step 12

Connect the test lamp J 34142-B between the MAF sensor ignition feed circuit and the battery ground.

Does the test lamp illuminate?
--
Yes: Go to Step 18
No: Go to Step 19

Step 13

1) Inspect for a poor connection at the MAF sensor harness terminals. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
2) If you find a poor connection, repair the condition as necessary. Refer to Repairing Connector Terminals in Wiring Systems.
Did you find and correct the condition?
--
Yes: Go to Step 24
No: Go to Step 21

Step 14

Repair the short to voltage in the MAF sensor signal circuit. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?
--
Yes: Go to Step 24
--

Step 15

Repair the open in the MAF sensor signal circuit. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?
--
Yes: Go to Step 24
--

Step 16

Repair the short to ground in the MAF sensor signal circuit. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?
--
Yes: Go to Step 24
--

Step 17

Repair the circuits that are shorted together. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?
--
Yes: Go to Step 24
--

Step 18

Repair the MAF sensor ground circuit for an open. Refer to Wiring Repairs in Wiring Systems.

Is the action complete?
--
Yes: Go to Step 24
--

Step 19

1) Repair the open or grounded ignition feed circuit to the MAF sensor. Refer to Wiring Repairs in Wiring Systems.
2) Replace the fuse if necessary.

Is the action complete?
--
Yes: Go to Step 24
--

Step 20

Repair the circuits that are shorted together between the MAF sensor signal circuit and the circuit for which the DTC set. Refer to Wiring Repairs in Wiring Systems

Is the action complete?
--
Yes: Go to Step 24
--

Step 21

Replace the MAF sensor. Refer to Mass Air Flow (MAF) Sensor Replacement .

Is the action complete?
--
Yes: Go to Step 24
--

Step 22

1) Inspect for a poor connection at the PCM. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.
2) If you find a poor connection, repair the condition as necessary. Refer to Repairing Connector Terminals in Wiring Systems.

Did you find and correct the condition?
--
Yes: Go to Step 24
No: Go to Step 23

Step 23

Important
Program the replacement PCM. Refer to PCM Replacement/Programming .

Replace the PCM.

Is the action complete?
--
Yes: Go to Step 24
--

Step 24

1) Select the Diagnostic Trouble Code (DTC) option and the Clear DTC Information option using the scan tool.
2) Idle the engine at the normal operating temperature.
3) Select the Diagnostic Trouble Code (DTC) option and the Specific DTC option, then enter the DTC number using the scan tool.
4) Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text, if applicable.

Does the scan tool indicate that this test ran and passed?
--
Yes: Go to Step 25
No: Go to Step 2

Step 25

Select the Capture Info option and the Review Info option using the scan tool.

Does the scan tool display any DTCs that you have not diagnosed?
--
Yes: Go to the applicable DTC table
No: System OK</font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">

JRcamaroZ28

iTrader: (41)

I contacted the place where I bought it and asked if it can be replced or fixed so i'm waiting a reply. Hopefully it can be fixed cause i dont want to buy another one <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />

JR

onyxxtreme

iTrader: (4)

thanks, CMNTMXR57
but i am more confused than an 8year old with a hooker
I checked my "ENG SENSOR" fuse, and it was infact blown
sooo.....any idea why it blew? I have never used MAFT. Will it blow again, after i start it up?

JRcamaroZ28

iTrader: (41)

well i'd replace the fuse and if it blows again then start looking for a short in the line somewhere.

JR

CMNTMXR57

If the fuse was blown, I'd replace it again and see if it blows again as suggested.

If it blows again, that's a smoking gun as to something that is causing excessive load beyond that fuse's protection capability. In which case you need to go to step 19 and repair the ignition feed circuit to the MAF. I am not well versed in MAFT's therefore I do not know how it affects this ignition feed circuit if it does at all. Perhaps some of those more experienced with MAFT's can answer that one.

<small>[ April 09, 2003, 10:01 AM: Message edited by: CMNTMXR57 ]</small>