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2008 - MX-5 - Engine

DTC P0550 [LF]



DTC P0550

PSP switch circuit malfunction

DETECTION CONDITION

  • The PCM monitors PSP switch signal at PCM terminal 2T. If input voltage is low voltage (switch stays on) for 1 min when the VSS is above 60.0 km/h {37.4 mph} and ECT is above 60 °C {140 °F}, the PCM determines that PSP switch circuit has malfunction.

    Diagnostic support note
  • This is a continuous monitor (CCM).

  • The MIL illuminates if the PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while the DTC for the same malfunction has been stored in the PCM.

  • PENDING CODE is available if the PCM detects the above malfunction condition during the first drive cycle.

  • FREEZE FRAME DATA is available.

  • The DTC is stored in the PCM memory.

POSSIBLE CAUSE

  • PSP switch malfunction

  • Connector or terminal malfunction

  • Short to ground in wiring harness between PSP switch terminal A and PCM terminal 2T

  • PCM malfunction


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 the FREEZE FRAME DATA on the repair order, then go to the next step.

2

VERIFY RELATED REPAIR INFORMATION AVAILABILITY
  • Verify related Service Bulletins and/or on-line 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.

No

Go to the next step.

3

INSPECT PSP SWITCH 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 7.

No

Go to the next step.

4

INSPECT PSP SWITCH

Yes

Go to the next step.

No

Replace PSP switch, then go to Step 7.

5

INSPECT PSP SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
  • Disconnect PCM connector.

  • Inspect continuity between PSP switch terminal (harness-side) A and body ground.

  • Is there continuity?

Yes

Repair or replace harness for short to ground, then go to Step 7.

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 7.

No

Go to the next step.

7

VERIFY TROUBLESHOOTING OF DTC P0550 COMPLETED
  • Make sure to reconnect all disconnected connectors.

  • Start engine.

  • Clear the DTC from the PCM memory using the M-MDS.

  • Drive vehicle above 60 km/h {37.3 mph} for 1 min.

  • Verify that ECT PID above 60 °C {140 °F} using the M-MDS.

  • Is PENDING CODE for this DTC present?

Yes

Replace PCM, then go to the next step.

(See PCM REMOVAL/INSTALLATION [LF].)

No

Go to the next step.

8

VERIFY AFTER REPAIR PROCEDURE

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [LF].)

No

Troubleshooting completed.




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