DTC P2187 [L3 R.H.D.]


DTC P2187	Fuel system too lean at idle
DETECTION CONDITION	• The 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 the preprogrammed criteria the PCM determines that the fuel system is too lean at idle. Diagnostic support note • The MIL illuminates if the 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. • The PENDING CODE is available if PCM detects the above malfunction conditions during first drive cycle. • FREEZE FRAME DATA is available. • The DTC is stored in the PCM memory.
POSSIBLE CAUSE	• Misfire • HO2S deterioration • HO2S heater malfunction • MAF sensor malfunction • Pressure regulator (built-in fuel injection pump) malfunction • Fuel pump malfunction • Fuel filter clogged or restricted • Fuel leakage in fuel line from fuel delivery pipe and fuel pump • Leakage exhaust system • Purge solenoid valve malfunction • Purge solenoid hoses improper connection • Air suction in intake-air system • Insufficient engine compression


STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA on the repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY • Verify related service repair information availability. • Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. • If the vehicle is not repaired, go to the next step.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE OR STORED DTCS • Turn the ignition switch off, then to the ON position (engine off). • Verify related pending code or stored DTCs. • Is any other DTC present?	Yes	If a misfire DTC is present, go to Step 8. If any other DTC is present, go to appropriate DTC troubleshooting procedure. (See DTC TABLE [L3 R.H.D.].)
3		No	If driveability concern is present, go to Step 8. If not, go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA • Is DTC P2187 in the FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to troubleshooting procedures for DTC in FREEZE FRAME DATA.
5	VERIFY CURRENT INPUT SIGNAL STATUS (KEY TO ON/IDLE) • Access the ECT, MAF, and TP PIDs using the WDS or equivalent.) • Is there any signal that greatly exceeds the specification when the ignition is at the ON position?	Yes	Inspect the suspected sensor and for excessive resistance in the related wiring harnesses. Repair or replace if necessary. Then go to Step 16.
5		No	Go to the next step.
6	VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION • Inspect the same PIDs as Step 5 while simulating the FREEZE FRAME DATA condition. • Is there any signal which causes drastic severe variation?	Yes	Inspect suspected sensor and related wiring harnesses, repair or replace it. Then go to Step 16.
6		No	Go to the next step.
7	VERIFY CURRENT INPUT SIGNAL STATUS OF HO2S • Access the O2S11 PID using the WDS or equivalent. • Inspect the PID under the following accelerator pedal conditions (in Park). • Is the PID reading normal? - Above 0.45 V when the accelerator pedal is suddenly depressed (rich condition). - Below 0.45 V just after release of the accelerator pedal (lean condition)	Yes	Go to the next step.
7		No	Visually inspect for any gas leakage between the exhaust manifold and HO2S. Go to Step 16.
8	VERIFY CURRENT INPUT SIGNAL STATUS OF MAF SENSOR • Connect the WDS or equivalent to the DLC-2. • Start the engine. • Access the MAF PID. • Verify that the MAF PID changes quickly according to engine speed. • Is the PID normal?	Yes	Go to the next step.
8		No	Replace MAF/IAT sensor, then go to Step 16.
9	INSPECT FOR EXCESSIVE AIR SUCTION OF INTAKE AIR SYSTEM • Visually inspect for loose, cracked or damaged hoses in the intake-air system. • Is there any malfunction?	Yes	Repair or replace the source of air suction, then go to Step 16.
9		No	Go to the next step.
10	INSPECT PURGE SOLENOID VALVE STUCK OPEN • Turn the ignition switch off. • Disconnect both hoses from the purge solenoid valve. • Blow air through purge solenoid valve. • Does air blow through?	Yes	Replace the purge solenoid valve. Then go to Step 16.
10		No	Go to the next step.
11	INSPECT FUEL LINE PRESSURE • Turn the ignition switch off. • Inspect the fuel line pressure. (See FUEL LINE PRESSURE INSPECTION [L3 R.H.D.].) • Is the fuel line pressure normal?	Yes	Go to Step 13.
11		No	If the fuel line pressure is too high, replace the fuel pump unit, then go to Step 16. If the fuel line pressure is low, go to the next step.
12	INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DELIVERY PIPE • Visually inspect the fuel line for any leakage. • Is any fuel leakage found?	Yes	Replace the fuel line, then go to Step 16.
12		No	Inspect for foreign material or stains inside fuel filter (low-pressure). If there is any foreign material or stains inside the fuel filter (low-pressure), clean the fuel tank and filter. Go to Step 16.
13	INSPECT IGNITION SYSTEM • Perform the spark test. (See Spark Test.) • Is strong blue spark visible at each cylinder?	Yes	Go to the next step.
13		No	Repair or replace any malfunctioning part according to spark test results, then go to Step 16.
14	INSPECT ENGINE COMPRESSION • Inspect the engine compression. (See COMPRESSION INSPECTION [L3].) • Is the compression normal?	Yes	Go to the next step.
14		No	Perform engine overhaul for repairs, then go to Step 16.
15	INSPECT FUEL INJECTOR • Remove the fuel injectors. • Inspect the fuel injectors (resistance, injection amount). (See FUEL INJECTOR INSPECTION [L3 R.H.D.].) • Are the fuel injectors normal?	Yes	Go to the next step.
15		No	Replace the fuel injector, then go to the next step.
16	VERIFY TROUBLESHOOTING OF DTC P2187 COMPLETED • Make sure to reconnect all disconnected connectors. • Clear the DTC from memory using the WDS or equivalent. • Perform KOER self test. (See KOEO/KOER SELF-TEST [L3 R.H.D.].) • Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION [L3].)
16		No	Go to the next step.
17	VERIFY AFTER REPAIR PROCEDURE • Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE [L3 R.H.D.].) • Is there any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [L3 R.H.D.].)
17		No	Troubleshooting completed.