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DTC P0550 [L8, LF, L3]

id0102a1808800

DTC P0550 | PSP switch circuit malfunction
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DETECTION CONDITION | • The PCM monitors PSP switch signal. If input voltage is low voltage (switch stays on) for 1 min. when the VSS is above 60 km/h {37 mph} and ECT is above 60 °C {140 °F}, the PCM determines that PSP switch circuit has a malfunction. Diagnostic support note • This is a continuous monitor (CCM). • MIL illuminates if PCM detects above malfunction condition in two consecutive drive cycles or in one drive cycle while DTC for the same malfunction has been stored in PCM. • PENDING CODE is available if PCM detects the above malfunction condition during first drive cycle. • FREEZE FRAME DATA is available. • DTC is stored in 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 • Open circuit in wiring harness between PSP switch terminal A and PCM terminal 2T • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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1 | VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAS BEEN RECORDED • Has FREEZE FRAME DATA been recorded? | Yes | Go to the next step.
No | Record the FREEZE FRAME on the repair order, then go to the next step.
2 | VERIFY RELATED REPAIR 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 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 • Perform PSP switch inspection. (See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION [L8, LF, L3].) • Is PSP switch normal? | 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 for continuity between PSP switch terminal A (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 the ignition switch to off. • Disconnect the 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 for continuity between PSP terminal A (harness-side) and PCM terminal 2T (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 the engine. • Clear the DTC from the PCM memory using the WDS or equivalent. • Drive vehicle above 60 km/h {37 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 [L8, LF, L3].)
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L8, LF, L3].) • Is any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L8, LF, L3].)
No | Troubleshooting completed.