DTC P2188, P2190 [AJ]

BME010202100W06

DTC P2188

DTC P2190

Fuel system too rich at idle (Right bank)

Fuel system too rich at idle (Left bank)

DETECTION CONDITION

• PCM monitors short term fuel trim (SHRTFT), long term fuel trim (LONGFT) during closed loop fuel control at idle. If the LONGFT and the sum total of these fuel trims exceed preprogrammed criteria. PCM determines that fuel system is too rich at idle.
Diagnostic support note
• This is a continuous monitor. (FUEL SYSTEM)
• The MIL illuminates if the PCM detects the above malfunction 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 the PCM detects the above malfunction condition during the first drive cycle.
• FREEZE FRAME DATA is available.
• DTC is stored in the PCM memory.

POSSIBLE CAUSE

• Misfire
• HO2S (RF, LF) deterioration
• HO2S heater (RF, LF) malfunction
• MAF sensor malfunction
• Pressure regulator (built-in fuel injection pump) malfunction
• Fuel pump malfunction
• EGR valve stuck open
• IMCC improper operation
• Purge solenoid valve improper operation
• Purge solenoid valve malfunction (stuck open)
• Purge solenoid hoses improper connection
• PCV valve malfunction
• PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION

1
VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED
• Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (Fuel system related) been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION AVAILABILITY
• Verify related Service Information and/or on-line 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.
No
Go to the next step.
3
VERIFY RELATED PENDING CODE OR STORED DTCS
• Turn the ignition switch to OFF, then ON (Engine off).
• Verify related pending code or stored DTCs using the WDS or equivalent.
• Is other DTC present?
Yes
If misfire DTC is present, go to Step 8.
If other DTC is present, go to appropriate DTC troubleshooting procedure.
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 P2188 or P2190 on FREEZE FRAME DATA?
Yes
Go to the next step.
No
Go to troubleshooting procedures for DTC on FREEZE FRAME DATA.
5
VERIFY CURRENT INPUT SIGNAL STATUS (IGNITION SWITCH TO ON/IDLE)
• Access ECT, MAF, TP and VSS PIDs using the WDS or equivalent.
• Is there any signal that is far out of specification when the ignition switch is ON and engine runs?
Yes
Inspect suspected sensor and excessive resistance in related wiring harnesses.
Repair or if necessary.
Then go to Step 15.
No
Go to the next step.
6
VERIFY CURRENT INPUT SIGNAL STATUS UNDER TROUBLE CONDITION
• Inspect same PIDs as Step 4 while simulating FREEZE FRAME DATA condition.
• Is there any signal which causes drastic changes?
Yes
Inspect suspected sensor and related wiring harnesses, repair or replace it.
Then go to Step 15.
No
Go to the next step.
7
VERIFY CURRENT INPUT SIGNAL STATUS OF FRONT HO2S
• Start the engine and warm it up completely.
• Access O2S11 (with P2198) or O2S21 (with P2190) PID using the WDS or equivalent.
• Check PID under following accelerator pedal condition (in PARK).
• Is PID reading normal?

- Above 0.45 V when accelerator pedal is suddenly depressed (rich condition).

- Below 0.45 V just after release of accelerator pedal (lean condition).

Yes
Go to the next step.
No
Visually inspect for any gas leakage between exhaust manifold and front HO2S.
• If there is no leakage, replace front HO2S.
Then go to Step 15.
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.
No
Replace MAF/IAT sensor, then go to Step 15.
9
INSPECT PURGE SOLENOID OPERATION
• Carry out Purge Control System Inspection.
• Does purge control system work properly?
Yes
Go to the next step.
No
Repair or replace malfunctioning part according to inspection result, then go to Step 15.
10
INSPECT PCV VALVE OPERATION
• Inspect PCV valve operation.
• Is PCV valve normal?
Yes
Go to the next step.
No
Replace the PCV valve, then go to Step 15.
11
INSPECT IMCC OPERATION
• Carry out Intake Manifold Communication Control (IMCC) Operation Inspection.
• Does VTCS work properly?
Yes
Go to the next step.
No
Repair or replace malfunctioning part according to inspection result, then go to Step 15.
12
INSPECT FUEL LINE PRESSURE
• Perform the "FUEL LINE PRESSURE INSPECTION".
• Is there any malfunction?
Yes
If fuel pressure is too high, replace fuel pump nit, then go to Step 15.
If fuel line pressure is low, go to the next step.
No
Go to Step 14.
13
INSPECT FUEL LEAKAGE FROM FUEL PUMP TO FUEL DELIVERY PIPE
• Visually inspect fuel line for any leakage.
• Is fuel leakage found?
Yes
Replace suspected fuel line, then go to Step 15.
No
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 Step 15.
14
INSPECT EGR VALVE STUCK OPEN
• Remove EGR valve.
• Does EGR valve stuck open?
Yes
Clean or replace EGR valve, then go to the next step.
No
Go to the next step.
15
VERIFY TROUBLESHOOTING OF DTC P2188 AND P2190 COMPLETED
• Make sure to reconnect all disconnected connectors.
• Clear DTC from PCM memory using WDS or equivalent.
• Perform the PCM Adaptive Memory Produce Drive MODE.
• Is the PENDING CODE same DTC present?
Yes
Replace PCM, then go to the next step.
No
Go to the next step.
16
VERIFY AFTER REPAIR PROCEDURE
• Perform "After Repair Procedure".
• Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Troubleshooting completed.