DTC P0550 [L8, LF]

id0102b1808800

DTC P0550

PSP switch circuit malfunction
DETECTION CONDITION
•  The PCM monitors the PSP switch signal. If the input voltage is low voltage (switch stays on) for 1 min when the VSS is above 60.0 km/h {37.4 mph} and the ECT is above 60 °C {140 °F}, the PCM determines that the 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 (Mode 2/Mode 12) is available.
•  The DTC is stored in the PCM memory.
POSSIBLE CAUSE
•  PSP switch connector or terminals malfunction
•  PSP switch malfunction
•  Short to ground in wiring harness between PSP switch terminal A and PCM terminal 2T
•  PCM connector or terminals malfunction
•  PCM malfunction

Diagnostic procedure

STEP

INSPECTION

ACTION
1
VERIFY FREEZE FRAME DATA (MODE 12) HAS BEEN RECORDED
•  Has the FREEZE FRAME DATA (Mode 12) been recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA (Mode 12) on the repair order, then go to the next step.
2
VERIFY RELATED SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  If the vehicle is not repaired, go to the next step.
No
Go to the next step.
3
INSPECT PSP SWITCH CONNECTOR AND TERMINALS
•  Turn the ignition switch off.
•  Disconnect the PSP connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to Step 7.
No
Go to the next step.
4
INSPECT PSP SWITCH
•  Inspect the PSP switch.
•  Is there any malfunction?
Yes
Replace the PSP switch, then go to Step 7.
(See POWER STEERING OIL PUMP DISASSEMBLY/ASSEMBLY.)
No
Go to the next step.
5
INSPECT PSP SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND
•  PSP switch connector is disconnected.
•  Turn the ignition switch off.
•  Inspect for continuity between PSP switch terminal (harness-side) A and body ground.
•  Is there continuity?
Yes
If the short to ground circuit could be detected:
•  Repair or replace the wiring harness for a possible short to ground.
If the short to ground circuit could not be detected:
•  Replace the PCM (short to ground in PCM internal circuit).
Go to Step 7.
No
Go to the next step.
6
INSPECT PCM CONNECTOR AND TERMINALS
•  Disconnect the PCM connector.
•  Inspect for poor connection (such as damaged/pulled-out pins, corrosion).
•  Is there any malfunction?
Yes
Repair or replace the connector or terminals, then go to the next step.
No
Go to the next step.
7
VERIFY DTC TROUBLESHOOTING COMPLETED
•  Make sure to reconnect all disconnected connectors.
•  Start the engine and warm it up completely.
•  Clear the DTC from the PCM memory using the M-MDS.
•  Drive the vehicle above 60.0 km/h {37.3 mph} for 1 min.
•  Perform the PID/DATA Monitor and Record Procedure and access the ECT PID.
•  Verify that the ECT PID above 60 °C {140 °F}.
•  Perform the Pending Trouble Code Access Procedure.
•  Is the PENDING CODE for this DTC present?
Yes
Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L8, LF].)
No
Go to the next step.
8
VERIFY AFTER REPAIR PROCEDURE
•  Perform the “AFTER REPAIR PROCEDURE”.
•  Are any DTCs present?
Yes
Go to the applicable DTC troubleshooting.
(See DTC TABLE [L8, LF].)
No
DTC troubleshooting completed.