Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC P2188, P2190 [AJ] 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.
1		No	Record FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Verify related Service Bulletins 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.
2		No	Go to the next step.
3	VERIFY RELATED PENDING CODE OR STORED DTCs Turn 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. (See DTC TABLE .)
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 P2188 or P2190 on FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to troubleshooting procedures for DTC on FREEZE FRAME DATA.
5	VERIFY CURRENT INPUT SIGNAL STATUS (KEY TO ON/IDLE) Access APP1, APP2, ECT, MAF, TP and VSS PIDs using the WDS or equivalent. Is there any signal that is far out of specification when 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.
5		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.
6		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 P2188) or O2S21 (with P2190) PID using the WDS or equivalent. Check PID under following accelerator pedal condition (in PARK (ATX) or NEUTRAL (MTX)). 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.
7		No	Visually inspect for any gas leakage between exhaust manifold and front HO2S. If there is no leakage, replace front HO2S. (See EXHAUST SYSTEM REMOVAL/INSTALLATION .) 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.
8		No	Replace MAF/IAT sensor, then go to Step 15
9	INSPECT PURGE SOLENOID OPERATION Carry out Purge Control System Inspection. (See PURGE CONTROL SYSTEM INSPECTION .) Does purge control system work properly?	Yes	Go to the next step.
9		No	Repair or replace malfunctioning part according to inspection result, then go to Step 15
10	INSPECT PCV VALVE OPERATION Inspect PCV valve operation. (See POSITIVE CRANKCASE VENTILATION (PCV) VALVE INSPECTION [AJ] .) Is PCV valve normal?	Yes	Go to the next step.
10		No	Replace PCV valve, then go to Step 15
11	INSPECT FUEL LINE PRESSURE Perform the "FUEL LINE PRESSURE INSPECTION". (See FUEL LINE PRESSURE INSPECTION .) Is there any malfunction?	Yes	If fuel pressure is too high, replace fuel pump unit, then go to Step 15. If fuel line pressure is low, go to the next step.
11		No	Go to Step 13.
12	INSPECT FUEL LEAKAGE FROM FUEL PUMP TO FUEL DELIVERY PIPE Visually inspect fuel line for any leakage. Is any fuel leakage found?	Yes	Replace suspected fuel line, then go to Step 14.
12		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.
13	INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION Inspect variable valve timing control system operation for right bank (with P2188) or left bank (with P2190). (See VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION INSPECTION .) Does variable valve timing control system work properly?	Yes	Go to the next step.
13		No	Repair or replace malfunctioning part according to inspection results, 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.
14		No	Go to the next step.
15	VERIFY TROUBLESHOOTING OF DTC P2188 AND P2190 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the WDS or equivalent. Perform the DRIVE MODE. Stop vehicle and access ON BOARD READINESS TEST to inspect drive mode completion status. Verify FUEL_EVAL PID changes to yes. If not, perform the DRIVE MODE again. Is the PENDING CODE same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
15		No	Go to the next step.
16	VERIFY AFTER REPAIR PROCEDURE Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE .) Is any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
16		No	Troubleshooting completed.