MAF Sensor Problems

[DRod_oc]

My '04 3 started having issues this week. It turns out that the black wire next to the green ground wire broke from the connector that connects into the MAF. Is it possiable to fix this with a little solder or do I need to get a new connector? Has anyone else had this problem?

Before anyone asks: Yes I installed a CAI in 2005. At the time of instalation I pulled as much slack out of the wireing harness so it would not strain the connector. I have not had any issues till this week.

Thanks in advance.

 

[DRod_oc]

I was able to pull out the crimp on connector and solder an attachment wire.

 

[TheMAN]

TSB: 01-006/06

2004-2005 MAZDA3 - MIL ILLUMINATION - P0172 / P2178 / P2188 SET

APPLICABLE MODEL(S)/VINS

2004-2005 Mazda3 vehicles with VINs lower than JM1BK**** **350581 ( produced before July 1, 2005)
DESCRIPTION

Some vehicles may experience MIL Illumination with DTC P0172 / P2178 / P2188 stored in PCM memory. This may be caused by a poor connection between the terminal and harness wire at the airflow sensor connector.
Other possible causes for this condition are as follow:

• Erratic signal from air flow sensor due to foreign material.
• Oxygen sensor malfunction.
• Engine coolant temperature sensor malfunction.
• Purge solenoid valve malfunction.

DTCs vary depending on vehicle.

• P0172 (Fuel system too rich) - California Spec 2.0L
• P2178 (Fuel system too rich at off idle) - Federal Spec 2.0L All 2.3L
• P2188 (Fuel system too rich at idle) - Federal Spec 2.0L All 2.3L

Customers having this concern should have their vehicle repaired using the following repair procedure.
REPAIR PROCEDURE

1. Verify customer concern.​

2. Record radio presets.​

3. Remove battery cover and battery duct. See Workshop Manual section 01-17 BATTERY REMOVAL / INSTALLATION. Use flat screwdriver to remove clip if necessary.​

4. Disconnect negative battery cable using 10mm wrench.​

5. Disconnect airflow sensor connector.​

6. Identify and carefully cut Black, protective tube of airflow sensor harness using scissors.​

7. Using 1/16" (1.7mm) wide pin extractor from Terminal repair kit, remove Black ground wire terminal from airflow sensor connector.​

8. Cut off ground wire terminal at base with wire cutter.​

9. Remove approximately 1/2" (10mm) of insulation from Black ground wire.​

10. This step applies short cord PN - BNYP-67-SH0. Measure from end of short cord opposite terminal end and cut off 1-1/2" (40mm) of wire.​

11. Remove approximately 1/2" (10mm) of insulation from new end of short cord.​

12. Twist short cord harness wire and Black ground wire together then solder. CAUTION:

• Follow all necessary precautions for safe soldering such as gloves, eye goggles, and respirator.
• Place protective cloth under harness to prevent damage from loose solder.

13. Bend soldered ground wire approximately 1-1/2" (40mm) from soldered end. Place heat shrink tubing over soldered end.​

14. Using heat gun provided in Terminal repair kit, AKS-630-1010 (or equivalent), heat tube to allow it to shrink. Shrinkage temperature is 250F (120C).​

15. Insert modified ground wire terminal into airflow connector until a click it heard, indicating the terminal lock has engaged. Verify that terminal is secure in connector by giving a slight pull.​

16. Wrap heat shrink tubing to harness wires using electrical tape.​

17. Reconnect airflow sensor connector.​

18. Reconnect battery "negative" cable. NOTE:

• If equipped with Mazda Genuine Accessories Remote Start System, follow these steps:
  1. Turn ignition key to ON position.
  2. Connect battery "negative" cable. Horn will "beep" once.
  3. Turn ignition key to OFF position.
  4. Crank engine until it starts one time, then shut engine OFF.

19. Reassembly battery duct and battery cover.​

20. Reset radio and clock.​

21. Verify repair.​

PART(S) INFORMATION



Part Number
Description
Qty.
Notes
BNYP-67-SH0
Short Cord Assy
1
Includes:

• Short Cord (1 pc)
• Heat Shrink Tubing (1 pc)

WARRANTY INFORMATION

NOTE:

• This warranty information applies only to verified customer complaints on vehicles eligible for warranty repair. Refer to the Warranty Wizard for warranty term information.
• Additional diagnostic time cannot be claimed for this repair.

Warranty Type
A
Symptom Code
6X
Damage Code
9S
Part Number Main Cause
BNYP-67-SH0
Quantity
1
Operation Number / Labor Hours:
XXB255RX / 0.6 Hrs

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[MAXX101]

did anyone bought the repair kit p/n 49L0-88-0A0A?

 

[edV44]

Mazda 3 MAF DTC P2188/P2178

I have an 04 Mazda 3 GT 2.3L which gave me a P2178 and P2188 trouble
code in Dec 08.
It turns out that the MAF sensor just needed cleaning.
I fixed the problem and cleared the P2188 code by doing the ff:
1. Remove the battery intake duct and related covers.
2. Locate the MAF under the intake duct cover (between the air filter
and throttle body).
3. Remove the 2 Philips head screws that affixes the MAF onto the
engine air intake duct.
4. Remove the MAF from the duct then remove the MAF wire harness.
5. Spray the MAF flat sensor wire with throttle body cleaner and gently swab
until the flat wire returns to its bright metal appearance (nickel color)
In my case I discovered that this wire was dirty and coated with
black colored varnish of gunk. No wonder it was not sensing the air mass
accurately.
6. Replace the MAF into the engine intake duct and fasten with the 2 screws.
7. Re-install the MAF wire harness and battery related covers/ducts.
8. Clear the DTC's with an OBD reader.
9. Start the engine and hopefully you will not have trouble codes P2178 and
P2188 anymore.

Try this inexpensive solution first before taking your car to an expensive repair shop.