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 P0133, P0153 [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 (HO2S 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 Check for related Service Bulletins and/or online repair information availability. Is any related repair information available?	Yes	Perform the 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 to off, then ON (Engine off). Verify pending codes or stored DTCs using the WDS or equivalent. Are the following DTCs also present? P0442 or P0443 with P0133 P0442 or P0443 with P0153	Yes	Go to the appropriate DTC troubleshooting procedures, then go to Step 13. (See DTC TABLE .)
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA Is DTC P0133 or P0153 in the FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to the troubleshooting procedures for the DTC in the FREEZE FRAME DATA. (See DTC TABLE .)
5	VERIFY CURRENT INPUT SIGNAL STATUS Warm up the engine. Access the O2S11 for P0133 or O2S21 for P0153 PID using the WDS or equivalent. Check the PID under the following accelerator pedal conditions (in PARK or NEUTRAL). Is the PID reading normal? 0.55 V or more when the accelerator pedal is suddenly depressed (rich condition). 0.55 V or less just after release of accelerator pedal (lean condition).	Yes	Go to step 8.
5		No	Go to the next step.
6	INSPECT INSTALLATION OF HO2S (RF, LF) Check if the HO2S (RF, LF) is loosely installed. Is the sensor installed securely?	Yes	Go to the next step.
6		No	Retighten the HO2S (RF, LF), then go to Step 13. (See EXHAUST SYSTEM REMOVAL/INSTALLATION .)
7	INSPECT GAS LEAKAGE FROM EXHAUST SYSTEM Visually check if any gas leakage is found between the exhaust manifold and the HO2S (RF, LF). (See EXHAUST SYSTEM INSPECTION .) Is there gas leakage?	Yes	Repair or replace any faulty exhaust parts, then go to Step 13. (See EXHAUST SYSTEM REMOVAL/INSTALLATION .)
7		No	Replace the HO2S (RF, LF), then go to Step 13. (See EXHAUST SYSTEM REMOVAL/INSTALLATION .)
8	INSPECT LONG TERM FUEL TRIM Access the following PIDs: For P0133: LONGFT1 For P0153: LONGFT2 Compare it with the FREEZE FRAME DATA recorded in Step 1. Is it below the FFD value?	Yes	Engine is driven under a rich condition. Go to the next step.
8		No	Engine is driven under a lean condition. Go to Step 10.
9	INSPECT FUEL LINE PRESSURE (EXCESSIVE FUEL LINE PRESSURE) Turn the ignition switch off. Inspect fuel line pressure when engine running. (See FUEL LINE PRESSURE INSPECTION .) Is there any malfunction?	Yes	Replace the fuel pump unit, then go to Step 13. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .)
9		No	Go to the next step.
10	INSPECT FUEL LINE PRESSURE (LOW FUEL LINE PRESSURE) Turn the ignition switch off. Inspect the fuel line pressure when the engine is running. (See FUEL LINE PRESSURE INSPECTION .) Is there any malfunction?	Yes	Go to the next step.
10		No	Go to step 13.
11	INSPECT FUEL LINE FROM FUEL PUMP TO FUEL DELIVERY PIPE Visually inspect fuel line for any leakage. Is any fuel leakage found?	Yes	Replace the suspected fuel line, then go to Step 13.
11		No	Inspect the low-pressure side fuel filter for the following: Foreign material or staining inside fuel filter Perform the following actions as result. If foreign material or staining is found inside fuel filter (low-pressure side), clean the fuel tank and filter. If normal, replace the fuel pump unit. (See FUEL PUMP UNIT REMOVAL/INSTALLATION .) Then go to Step 13.
12	INSPECT SEALING OF ENGINE COOLANT PASSAGE WARNING: Removing the radiator cap when the radiator is hot is dangerous. Scalding coolant and steam may shoot out and cause serious injury. When removing the radiator cap, wrap a thick cloth around it and turn it slowly. Remove radiator cap. Bleed air from the engine coolant, then run the engine at idle. Are there any small bubbles, which make engine coolant white at the filler opening? NOTE: Large bubbles are normal since they are remaining air coming from the engine coolant passage.	Yes	Air penetrates due to poor sealing on the head gasket or other areas between the combustion chamber and the engine coolant passage. Repair or replace malfunctioning parts, then go to the next step.
12		No	Go to the next step.
13	VERIFY TROUBLESHOOTING OF DTC P0133 or P0153 COMPLETED Make sure to reconnect all disconnected connectors. Turn the ignition switch to the ON position (Engine off). Clear the DTC from memory using the WDS or equivalent. Start the engine. Run DRIVE MODE 1 and 3. (See OBD-II DRIVE MODE .) Stop the vehicle and access the ON BOARD SYSTEM READINESS TEST (Mode 1) to inspect the DRIVE MODE completion status. Verify O2S_EVAL PID changes to Yes. If not, run the DRIVE MODE again. Access the DIAGNOSTIC MONITORING TEST RESULTS. Verify the following TEST # values: (See DIAGNOSTIC MONITORING TEST RESULTS .) For P0133: 10: 01: 05 (HO2S (RF) rich-to-lean response time). 10: 01: 06 (HO2S (RF) lean-to-rich response time). 10: 01: 0A (HO2S (RF) inversion cycles) For P0153: 10: 05: 05 (HO2S (LF) rich-to-lean response time 10: 05: 06 (HO2S (LF) lean-to-rich response time 10: 05: 0A (HO2S (LF) inversion cycles Are they all below the MAX value?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
13		No	Go to the next step.
14	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 .)
14		No	Troubleshooting completed.