Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MX-5 Miata. However, it is still accessible from the selected car via links, so may be relevant.

DTC P2188 [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

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 FREEZE FRAME DATA on repair order, then go to the next step.
2	VERIFY RELATED REPAIR INFORMATION AVAILABILITY Check for related Service Bulletins 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. 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 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 (IGNITION KEY 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 ignition key is ON and engine runs?	Yes	Inspect suspected sensor and excessive resistance in related wiring harnesses. Repair or if necessary. Then go to Step 16.
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 16.
6		No	Go to the next step.
7	VERIFY CURRENT INPUT SIGNAL STATUS OF FRONT HO2S Access O2S11 for P2188 PID using the WDS or equivalent. Check PID under following accelerator pedal condition (in PARK (ATX) or NEUTRAL (MTX)). Is PID reading okay? 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	Inspect for air suction at following due to cracks damages and loosing parts: From air cleaner to throttle body. From throttle body to dynamic chamber. From dynamic chamber and intake manifold Vacuum hoses NOTE: Engine speed may change when rust penetrating agent is sprayed on the air suction area. Repair or replace any faulty part, then go to Step 16.
7		No	Visually inspect for any gas leakage between exhaust manifold and front HO2S. Then 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 15.
9	INSPECT PURGE SOLENOID OPERATION Carry out purge solenoid valve Inspection. (See PURGE SOLENOID VALVE 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 16.
10	INSPECT PCV VALVE OPERATION Inspect PCV valve operation. (See PCV VALVE INSPECTION .) Is PCV valve okay?	Yes	Go to the next step.
10		No	Replace PCV valve, then go to Step 17.
11	INSPECT VTCS OPERATION Carry out Variable Tumble Control System (VTCS) Operation Inspection. (See VARIABLE TUMBLE CONTROL SYSTEM (VTCS) OPERATION INSPECTION .) Does VTCS work properly?	Yes	Go to the next step.
11		No	Repair or replace malfunctioning part according to inspection result, then go to Step 16.
12	INSPECT FUEL LINE PRESSURE Turn the ignition switch off. NOTE: If engine will not start, inspect fuel line pressure with ignition key ON. Inspect fuel line pressure while engine running. (See FUEL LINE PRESSURE INSPECTION .) Is fuel line pressure okay?	Yes	Go to the next step.
12		No	If fuel pressure is too high, replace pressure regulator, then go to Step 16. If fuel line pressure is low, go to the next step.
13	INSPECT FUEL LINE 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 16.
13		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. If no foreign materials or no stain inside fuel filter (low-pressure side), replace fuel pump. Then go to Step 16.
14	INSPECT VARIABLE VALVE TIMING CONTROL SYSTEM OPERATION Inspect variable valve timing control system operation. (See VARIABLE VALVE TIMING SYSTEM OPERATION INSPECTION .) Does variable valve timing control system work properly?	Yes	Go to the next step.
14		No	Repair or replace malfunctioning part according to inspection results, then go to Step 16.
15	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.
15		No	Go to the next step.
16	VERIFY TROUBLESHOOTING OF DTC P2188 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the WDS or equivalent. Perform the PCM Adaptive Memory Procedure Drive Mode. (See OBD-II DRIVE MODE .) Is same DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
16		No	Go to the next step.
17	VERIFY AFTER REPAIR PROCEDURE Perform the "AFTER REPAIR PROCEDURE ". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
17		No	Troubleshooting completed.