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 P0101 [AJ] 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 and/or online 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 CURRENT INPUT SIGNAL STATUS-IS CONCERN INTERMITTENT OR CONSTANT Connect WDS or equivalent to DLC-2. Start engine. Access ECT, TP1 and MAF PIDs. Warm up engine until ECT PID is 70 °C {158 °F} or above. Drive vehicle. Read MAF PID when TP1 PID is 50% or above. Is MAF PID reading the threshold or below?	Yes	Make sure that TP1 PID changes smoothly when gradually opening throttle valve. If not, replace throttle body and go to Step 5. (See INTAKE AIR SYSTEM REMOVAL/INSTALLATION .) For other, go to the next step.
3		No	Go to the next step.
4	VERIFY CURRENT INPUT SIGNAL STATUS - IS CONCERN INTERMITTENT OR CONSTANT Connect WDS or equivalent to DLC-2. Start engine. Access ECT, MAF and RPM PIDs. Warm up engine until ECT PID is 70 °C {158°F} or above. Read MAF PID when RPM PID is 2,000 rpm or below. Is MAF PID reading 52 I/s or above?	Yes	Go to Step 6.
4		No	Intermittent concern exists. Go to "INTERMITTENT CONCERNS TROUBLESHOOTING". (See INTERMITTENT CONCERN TROUBLESHOOTING .)
5	VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED Make sure to reconnect all disconnected connectors. Turn the ignition switch to the ON position. Clear the DTC from the memory using the WDS or equivalent. Start engine. Access ECT, TP1 and MAF PIDs. Warm up engine until ECT PID is reading 70°C {158°F} or above. Drive vehicle and read TP1 and MAF PIDs. NOTE: Verify PIDs reading are within specifications for 5 s or more. MAF PID: the threshold or above TP1 PID: 50% or above Is PENDING CODE for this DTC present?	Yes	Replace PCM, then go to Step 9. (See PCM REMOVAL/INSTALLATION .)
5		No	Go to Step 9.
6	INSPECT MAF/IAT SENSOR CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect MAF/IAT sensor connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 8.
6		No	Go to the next step.
7	INSPECT PCM CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect PCM connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). Is there any malfunction?	Yes	Repair or replace the terminal, then go to the next step.
7		No	Replace MAF/IAT sensor, then go to the next step. (See INTAKE AIR SYSTEM REMOVAL/INSTALLATION .)
8	VERIFY TROUBLESHOOTING OF DTC P0101 COMPLETED Make sure to reconnect all disconnected connectors. Turn the ignition switch to the ON position. Clear the DTC from the memory using the WDS or equivalent. Start engine. Warm up engine until ECT PID is 70 °C {158 °F} or above. Read MAF and RPM PIDs. NOTE: MAF PID should indicate 52 I/s or below when RPM PID is 2,000 rpm or below. Is PENDING CODE for this DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
8		No	Go to the next step.
9	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
9		No	Troubleshooting completed.