Dtc P2187 [Lf] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
(See FUEL LINE PRESSURE
INSPECTION.)
• Is fuel line pressure normal?
INSPECT FUEL LINE FROM FUEL PUMP
TO FUEL DELIVERY PIPE
14
• Visually inspect fuel line for any leakage.
• Is any fuel leakage found?
VERIFY TROUBLESHOOTING OF DTC
P2178 COMPLETED
• Make sure to reconnect all disconnected
connectors.
• Clear DTC from PCM memory using WDS
or equivalent.
15
• Perform the PCM Adaptive Memory
Produce Drive Mode.
(See OBD DRIVE MODE
• Is the PENDING CODE for this DTC
present?
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
16
(See AFTER REPAIR PROCEDURE
• Is there any DTC present?
DTC P2187
• PCM monitors short term fuel trim (SHRTFT) and long term fuel trim (LONGFT)
during closed loop fuel control at idle. If the LONGFT or the sum total of these fuel
terms exceed preprogrammed criteria. PCM determines that fuel system is too lean at
idle.
Diagnostic support note
DETECTION
CONDITION
• 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.
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Yes
No
Yes
No Go to the next step.
[LF].)
Yes
[LF].)
No Troubleshooting completed.

DTC P2187 [LF]

Fuel system too lean at idle
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If fuel line pressure is low, go to the next step.
Replace suspected fuel line, then go to the next
step.
Inspect for foreign materials or stain inside fuel
filter (low-pressure).
If for foreign materials or stain inside fuel filter
(low-pressure), clean of fuel tank and filter.
Then go to the next step.
Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION
Go to the applicable DTC inspection.
(See DTC TABLE [LF].)
- automotive repair manuals website
[LF].)
B3E010202100W03