Honda Civic manuals

Subaru Legacy Service Manual: Dtc p0171 system too lean bank 1

Refer to DTC P0172 for diagnostic procedure. Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0172 SYSTEM TOO RICH BANK 1

1. OUTLINE OF DIAGNOSIS

Detect fuel system malfunction by the amount of main feedback control.

2. EXECUTION CONDITION

Secondary Parameters

Execution condition

Closed loop control with main feedback

Operation

3. GENERAL DRIVING CYCLE

Perform the diagnosis continuously during the closed loop.

4. DIAGNOSTIC METHOD

Compare the diagnostic value (fsobd) with the threshold value, and if a condition meeting the malfunction criteria listed below continues for 10 s - 3 time(s) or more, judge that there is a fault in the fuel system.

Judgment Value

Malfunction Criteria

Threshold Value

fsobd = (sglmd − tglmda) + faf + flaf

≥ Value from Map

In this case: sglmd = measured lambda

tglmda = target lambda

faf = main feedback compensation coefficient (every 64 milliseconds)

flaf = main feedback learning compensation coefficient

Map

Amount of air (g (oz)/s)

0 (0)

3.2 (0.11)

6.4 (0.23)

9.6 (0.34)

12.8 (0.45)

16 (0.56)

19.2 (0.68)

fsobdL1 (%)

1.33

1.33

1.33

1.33

1.33

1.33

1.33

Time Needed for Diagnosis: 10 s - 3 time(s)

Malfunction Indicator Light Illumination: Illuminates when malfunction occurs in 2 continuous driving cycles.

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