DTC P0550 [L8, LF]

id0102b1808800

DTC P0550 | PSP switch circuit malfunction
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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
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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. (See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION [L8, LF].) • 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). (See PCM REMOVAL/INSTALLATION [L8, LF].) 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. (See AFTER REPAIR PROCEDURE [L8, LF].) • 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. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • Verify that the ECT PID above 60 °C {140 °F}. • Perform the Pending Trouble Code Access Procedure. (See ON-BOARD DIAGNOSTIC TEST [L8, LF].) • 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”. (See AFTER REPAIR PROCEDURE [L8, LF].) • Are any DTCs present? | Yes | Go to the applicable DTC troubleshooting. (See DTC TABLE [L8, LF].)
No | DTC troubleshooting completed.