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 P0500 [BP, BP WITH TC] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA HAS BEEN RECORDED Has FREEZE FRAME PID 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 REPAIR INFORMATION AVAILABILITY Check for related Service Bulletins and/or online repair information availability. Is any related repair information available?	Yes	Perform repair or diagnostic 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	CLASSIFY VSS SIDE OR PCM SIDE MALFUNCTION Start engine. Drive vehicle. Does speedometer needle move when driving vehicle?	Yes	Go to the next step.
3		No	MT : Go to Step 8. AT : Go to Step 12.
4	VERIFY DTC P0500 PRESENT Clear the DTC from the memory using the WDS or equivalent. Warm up the engine. Access LOAD and RPM PID using the WDS or equivalent. Drive vehicle under following condition for 25.6 s or more while monitoring PIDs. LOAD PID: 40% or above RPM PID: 2,000 rpm or above Is DTC P0500 present?	Yes	Go to the next step.
4		No	Go to Step 6.
5	INSPECT VEHICLE SPEED SIGNAL CIRCUIT FOR SHORT TO GND Ignition key to OFF. Disconnect cruise control module and PCM connector. Check continuity between PCM terminal 3T and body GND. Is there continuity?	Yes	Repair or replace harness, then go to Step 18.
5		No	Replace speedometer, then go to Step 18.
6	INSPECT PCM CONNECTOR FOR POOR CONNECTION Disconnect PCM connector. Check for poor connection (damaged, pulled-out terminals, corrosion etc.). Is connection okay?	Yes	Go to the next step.
6		No	Repair or replace pin or connection, then go to Step 18.
7	INSPECT PCM CIRCUIT FOR OPEN CIRCUIT Check continuity between PCM terminal 3T (harness-side) and instrument cluster terminal 2L (harness-side). Is there continuity?	Yes	Go to Step 18.
7		No	Repair or replace harness, then go to Step 18.
8	INSPECT VEHICLE SPEED SIGNAL CIRCUIT AT INSTRUMENT CLUSTER FOR OPEN CIRCUIT Turn the ignition switch off. Disconnect instrument cluster and VSS connector. Check continuity between following terminals. VSS terminal A (harness-side) and instrument cluster terminal 2M (harness-side) VSS terminal 6 (harness-side) and instrument cluster terminal 1M (harness-side) Is there continuity?	Yes	Go to the next step.
8		No	Repair or replace harness for open circuit, then go to Step 18.
9	INSPECT VEHICLE SPEED SIGNAL CIRCUIT AT INSTRUMENT CLUSTER CIRCUIT FOR SHORT Check continuity between VSS connector terminal A and B (harness-side). Is there continuity?	Yes	Repair or replace harness for short, then go to Step 18.
9		No	Go to the next step.
10	INSPECT VEHICLE SPEED SIGNAL AT INSTRUMENT CLUSTER FOR SHORT TO GND Check continuity between instrument cluster terminal (harness-side) and body GND. 1M and body GND 2M and body GND Is there continuity?	Yes	Repair or replace harness for short to GND, then go to Step 18.
10		No	Go to the next step.
11	INSPECT VSS OUTPUT VOLTAGE Remove the VSS. Inspect voltage between VSS connector (parts-side) Is voltage okay? (See VEHICLE SPEEDOMETER SENSOR INSPECTION )	Yes	Inspect speedometer, then go to Step 18.
11		No	Replace VSS, go Step 18.
12	INSPECT VEHICLE SPEED SIGNAL AT INSTRUMENT CLUSTER FOR SHORT TO GND Check continuity between TCM terminal AC (harness-side) and body GND. Is there continuity?	Yes	Repair or replace harness for short to GND, then go to Step 18.
12		No	Go to the next step.
13	INSPECT VEHICLE SPEED SIGNAL AT INSTRUMENT CLUSTER CIRCUIT FOR OPEN CIRCUIT Turn ignition switch to OFF. Disconnect instrument cluster and TCM connector. Check continuity between instrument cluster terminal 2M (harness-side) and TCM terminal AC (harness-side). Is there continuity?	Yes	Go to the next step.
13		No	Repair or replace harness for open circuit, then go to Step 18.
14	INSPECT OUTPUT SPEED SIGNAL AT TCM FOR OPEN CIRCUIT Turn the ignition switch off. Disconnect TCM and output speed sensor connector. Check continuity between following terminals. Output speed sensor terminal A (harness-side) and TCM terminal W (harness-side) Output speed sensor terminal B (harness-side) and TCM terminal Z (harness-side) Is there continuity?	Yes	Go to the next step.
14		No	Repair or replace harness for open circuit, then go to Step 18.
15	INSPECT OUTPUT SPEED SIGNAL CIRCUIT AT TCM FOR SHORT Check continuity between output speed sensor terminal A and B (harness-side). Is there continuity?	Yes	Repair or replace harness for short, then go to Step 18.
15		No	Go to the next step.
16	INSPECT VEHICLE SPEED SIGNAL AT TCM FOR SHORT TO GND Check continuity between TCM terminal (harness-side) and body GND. W and body GND Z and body GND Is there continuity?	Yes	Repair or replace harness for short to GND, then go to Step 18.
16		No	Go to the next step.
17	INSPECT OUTPUT SPEED SENSOR RESISTANCE Disconnect output speed sensor connector. Measure resistance between output speed sensor terminal A and B (parts-side). Is resistance okay? (See OUTPUT SPEED SENSOR INSPECTION )	Yes	Inspect vehicle speedometer, then go to the next step.
17		No	Replace output speed sensor, then go to the next step.
18	VERIFY TROUBLESHOOTING OF DTC P0500 COMPLETED Make sure to connect all disconnected connectors. Clear the DTC from the PCM memory using the WDS or equivalent. Access LOAD and RPM PID using the WDS or equivalent. Drive vehicle under following condition for 25.6 s or more while monitoring PIDs. LOAD PID: 40% or above RPM PID: 2,000 rpm or above Is same DTC present?	Yes	Replace PCM, then go to the next step.
18		No	Go to the next step.
19	VERIFY 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 )
19		No	Troubleshooting completed.