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 P0550 [L3] 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. |
| 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 formation 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.
|
| No |
Go to the next step. |
| 3 |
INSPECT PSP CONNECTOR FOR POOR CONNECTION
- Turn the ignition switch off.
- Disconnect PSP connector.
- Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
- Is there any malfunction?
|
Yes |
Repair or replace the terminal, then go to Step 8. |
| No |
Go to the next step. |
| 4 |
INSPECT PSP SWITCH
|
Yes |
Go to the next step. |
| No |
Replace PSP switch, then go to Step 8. |
| 5 |
INSPECT PSP SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
- Disconnect PCM connector.
- Inspect continuity between PSP switch terminal (harness-side) and body ground.
- Is there continuity?
|
Yes |
Repair or replace harness for short to ground, then go to Step 8. |
| No |
Go to the next step. |
| 6 |
INSPECT PCM CONNECTOR FOR POOR CONNECTION
- Turn ignition switch to OFF
- Disconnect PCM connector.
- Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
- Is there any malfunction?
|
Yes |
Repair terminal, then go to Step 8. |
| No |
Go to the next step. |
| 7 |
INSPECT SIGNAL CIRCUIT MALFUNCTION FOR OPEN CIRCUIT
- Inspect continuity between PSP terminal A (harness-side) and PCM terminal 55, 1Z (harness-side).
- Is there continuity?
|
Yes |
Repair or replace harness, then go to the next step. |
| No |
Go to the next step. |
| 8 |
VERIFY TROUBLESHOOTING OF DTC P0550 COMPLETED
- Make sure to reconnect all disconnected connectors.
- Start engine.
- Clear the DTC from the PCM memory using the WDS or equivalent.
- Drive vehicle above 60 km/h {37.3 mph}
for 1 min.
- Verify that ECT PID above 60 °C {140 °F}
using the WDS or equivalent.
- Is PENDING CODE for this DTC present?
|
Yes |
Replace PCM, then go to the next step. (See
PCM REMOVAL/INSTALLATION
.) |
| No |
Go to the next step. |
| 9 |
VERIFY AFTER REPAIR PROCEDURE
|
Yes |
Go to the applicable DTC inspection. (See
DTC TABLE .) |
| No |
Troubleshooting completed. |