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Drew
Drew, Super Mazda Tech.
Category: Mazda
Satisfied Customers: 2518
Experience:  19 yrs. experience. Mazda Senior Certified Tech, with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
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Mazda 3 hello, I have Mazda 3 hatchback 2004 with 108k miles

Resolved Question:

hello,
I have Mazda 3 hatchback 2004 with 108k miles on it and recently I am getting code 2177 - System too lean off Idle speed (Bank 1).
Besides the alarm car runs good, I just like to have everything in good order so I would like to fix it.
Can anybody help what to do?
Submitted: 3 years ago.
Category: Mazda
Expert:  Drew replied 3 years ago.

Welcome to Just Answer. My name is XXXXX XXXXX I will be glad to assist you.

 

This fault code lean off idle is usually cause by a faulty evap canister purge valve. Here is a TSB for your concern. I would start with the purge valve.

 

Please let me know if you have any additional questions.

 

Thanks,

Drew

 

 

graphic

TSB: 01-052/06

2004-2006 MAZDA3, MAZDA6 - MIL ILLUMINATION, P0171 / P0172 / P0441 / P0442 / P0455 / P0456 / P2177 / P2178 / P2187 / P2188

NOTE: This bulletin replaces 01-025/05. Please update your records accordingly.

BULLETIN NOTE

This bulletin supersedes the previous bulletin 01-025/05, issued on 09/21/05. The PART(S) and WARRANTY INFORMATION has been revised.

APPLICABLE MODEL(S)/VINS

2004 - 2006 MAZDA3

2004 - 2006 MAZDA6 2.3L

DESCRIPTION

Some vehicles may experience MIL illumination with DTC P0171 / P0172 / P0441 / P0442 / P0455 / P0456 /P2177 / P2178 / P2187 / P2188 stored in PCM memory.

P0171: Fuel trim system too lean. (Federal Spec.)

P0172: Fuel trim system too rich. (Federal Spec.)

P0441: Evaporative emission control system incorrect purge flow.

P0442: Evaporative emission control system leak detected (small leak)

P0455: Evaporative emission control system leak detected (gross leak)

P0456: Evaporative emission control system leak detected (very small leak) (Calif. Spec.)

P2177: Fuel system too lean at off idle. (Calif. Spec.)

P2178: Fuel system too rich at off idle. (Calif. Spec.)

P2187: Fuel system too lean at idle. (Calif. Spec.)

P2188: Fuel system too rich at idle. (Calif. Spec.)

This may be due to a stuck opened purge solenoid valve.

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

REPAIR PROCEDURE

1. Verify concern.
2. Capture freeze frame data then clear all DTCs.
3. Inspect the airflow sealing of the purge solenoid valve by using the Purge Solenoid Test Cap (MT04-F2-001) and vacuum pump below. Apply vacuum to at least 20". The vacuum reading should hold indefinitely.
  • If the vacuum reading does not hold, replace the purge solenoid valve.

  • If the vacuum reading holds, go to next step.

NOTE: Make sure the Purge Solenoid Test Cap (MT04-F2-001) does not leak at the fitting before testing purge solenoid valve.

4. Cycle purge solenoid valve a few times to check for intermittent sealing issues. Refer to page 01-16-14 Airflow Inspection of 2004 Mazda3 Workshop Manual and page 01-16-15 Airflow Inspection of 2004 Mazda3 Workshop Manual.

TOOL(S) INFORMATION



Tool Number

Description

Qty.

Note

MT04-F2-001

Purge Solenoid Test Cap

1

All dealers received one tool at no cost. Additional tools can be ordered through MStore if needed.


PART(S) INFORMATION



Model

Part Number

Description

Qty.

2004-06 Mazda3

LF66-20-360J

Purge Solenoid Valve with Hose

1

2004-05 Mazda6 2.3L

L391-18-740B

Purge Solenoid Valve with Hose

1

2006 Mazda6 2.3L

L3P9-18-740A

Purge Solenoid Valve with Hose

1

Customer: replied 3 years ago.
I found the same answer online for free question is now, can I do following check without using original tool if yes how:
Inspect the airflow sealing of the purge solenoid valve by using the Purge Solenoid Test Cap (MT04-F2-001) and vacuum pump below. Apply vacuum to at least 20". The vacuum reading should hold indefinitely.
I have vacuum pump just not mazda original could possibly gte right fittings too.
Thanks,
Ryszard
Expert:  Drew replied 3 years ago.

You can use a piece of hose and to connect your vacuum pump and use your finger to plug the other end.

 

Only about 1 out of 20 of these faulty purge valves will actually leak vacuum when tested. There are usually an intermittent fault and hard to duplicate.

 

Sometimes you can put them in the freezer and recheck, then they might fail.

 

When you buy a new purge solenoid from Mazda, it comes with the special plug tool in the end of the hose.

Customer: replied 3 years ago.
Last thing, when I replace this valve and alarm will show up again, any other ideas?
Expert:  Drew replied 3 years ago.

The alarm you are talking about must be the check engine light.

 

You will have to clear the fault codes from the PCM. This can sometimes be accomplished by disconnecting the battery and touch the cable together for 30 sec. You can also clear the fault codes using a code reader.

 

If this fault code comes back again, after the purge valve is replaced, the next step will be to check this list of possible causes for the code.

 

DTC P2177

Fuel system too lean at off idle

DETECTION CONDITION

  • PCM monitors short term fuel trim (SHRTFT), long term fuel trim (LONGFT) during closed loop fuel control at off-idle. If the LONGFT and the sum total of these fuel trims exceed preprogrammed criteria. PCM determines that fuel system is too lean at off-idle.

    Diagnostic support note
  • This is a continuous monitor. (Fuel system)

  • MIL illuminates if PCM detects the above malfunctioning condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.

  • PENDING CODE is available if PCM detects the above malfunction conditions during first drive cycle.

  • FREEZE FRAME DATA is available.

  • DTC is stored in the PCM memory.

POSSIBLE CAUSE

  • Misfire

  • Front HO2S deterioration

  • Front HO2S heater malfunction

  • MAF sensor malfunction

  • Pressure regulator (built-in fuel injection pump) malfunction

  • Fuel pump malfunction

  • Fuel filter clogged or restricted

  • Fuel leakage on fuel line from fuel delivery pipe and fuel pump

  • Leakage exhaust system

  • Purge solenoid valve improper operation

  • Purge solenoid valve malfunction (stuck open)

  • Purge solenoid hoses improper connection

  • Air suction in intake-air system

  • Insufficient engine compression

  • Variable valve timing control system improper operation (L3)

  • PCM malfunction

Drew, Super Mazda Tech.
Category: Mazda
Satisfied Customers: 2518
Experience: 19 yrs. experience. Mazda Senior Certified Tech, with Ford, Linc. & Merc. experience. ASE L1 Advanced Certified Master Tech.
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