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 P0500 [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 PID DATA on repair order, then go to the next step.
2	VERIFY RELATED SERVICE INFORMATION AVAILABILITY Check for related Service Information availability. Is any related Service Information available?	Yes	Perform repair or diagnosis according to available Service 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 VSS PID using the WDS or equivalent. Vehicle speed 20 km/h {12.4 mph}: 20km/h {12.4 mph} Vehicle speed 40 km/h {24.8 mph}: 40km/h {24.8 mph} Are PID readings within specification?	Yes	Intermittent concern exists. Go to "INTERMITTENT CONCERNS TROUBLESHOOTING". (See INTERMITTENT CONCERN TROUBLESHOOTING .)
3		No	Go to the next step.
4	VERIFY VEHICLE TYPE Verify the vehicle type. Is the vehicle MTX without ABS/TCS?	Yes	Go to the next step.
4		No	ATX without ABS/TCS Go to the applicable DTC inspection. (See DTC TABLE .) With ABS/TCS Go to the applicable DTC inspection. (See ABS/TCS ON-BOARD DIAGNOSIS .)
5	INSPECT VSS CONNECTOR FOR POOR CONNECTION Turn the ignition switch off. Disconnect VSS connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion, etc.). Is there any malfunction?	Yes	Repair or replace the terminal, then go to Step 11.
5		No	Go to the next step.
6	INSPECT VSS CIRCUIT FOR SHORT TO GND Turn the ignition switch off. Check continuity between the following circuits: VSS terminal A (harness-side) and body GND VSS terminal B (harness-side) and body GND Is there continuity?	Yes	Repair or replace harness for short to GND, then go to Step 11.
6		No	Go to the next step.
7	INSPECT VSS CIRCUIT FOR SHORT TO POWER Turn the ignition switch off. Disconnect VSS connector. Measure voltage between the following circuits: VSS terminal A (harness-side) and body GND VSS terminal B (harness-side) and body GND Is voltage reading?	Yes	Repair or replace harness for short to power, then go to Step 11.
7		No	Go to the next step.
8	INSPECT VSS Inspect VSS. (See VEHICLE SPEEDOMETER SENSOR INSPECTION (WITHOUT ABS) .) Is there any malfunction?	Yes	Replace VSS, then go to Step 11. (See VEHICLE SPEEDOMETER SENSOR REMOVAL/INSTALLATION (WITHOUT ABS) .)
8		No	Go to the next step.
9	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 Step 11.
9		No	Go to the next step.
10	INSPECT VSS CIRCUIT FOR OPEN CIRCUIT Turn the ignition switch off. Check continuity between the following harnesses: VSS terminal A (harness-side) and PCM terminal 79 (harness-side) VSS terminal B (harness-side) and PCM terminal 53 (harness-side) Is there continuity?	Yes	Go to the next step.
10		No	Repair or replace harness for open circuit, then go to the next step.
11	VERIFY TROUBLESHOOTING OF DTC P0500 COMPLETED Make sure to reconnect all disconnected connectors. Turn the ignition switch to the ON position. Clear the DTC from the PCM memory using the WDS or equivalent. Warm-up engine. Access RPM and LOAD PID using the WDS or equivalent. Drive vehicle under following conditions for 18 s. Engine speed: 2,000 rpm or above Gear: Gear is in other than NEUTRAL Load: 40% or above Is PENDING CODE same as DTC present?	Yes	Replace PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
11		No	Go to the next step.
12	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .) Are any DTCs present?	Yes	Go to applicable DTC troubleshooting. (See DTC TABLE .)
12		No	Troubleshooting completed.