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DTC P0550 [L3]

BME010200500211

DTC P0550 | PSP switch circuit malfunction
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DETECTION CONDITION | • PCM monitors PSP switch signal at PCM terminal 1Z. If input voltage is low (switch stays on) for 1 minute when VSS is above 60.1 km/h {37.3 mph} and ECT is above 60 °C {140 °F}, PCM determines that PSP switch circuit has malfunction. Diagnostic support note
• This is a continuous monitor (CCM).
• MIL illuminates if PCM detects the above malfunction conditions 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 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 between PSP switch terminal and PCM terminal 1Z • Open circuit in wiring between PSP switch terminal and PCM terminal 1Z • PCM malfunction

Diagnostic procedure

STEP | INSPECTION | ACTION
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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 SERVICE INFORMATION AVAILABILITY • Check for related Service Information availability. • Is any related Service Information available? | Yes | Perform repair or diagnosis according to available Service Information. • If vehicle is not repaired, go to the next step.
No | Go to the next step.
3 | INSPECT POOR CONNECTION OF PSP CONNECTOR • Turn the ignition switch off. • Disconnect PSP connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • Is there any malfunction? | Yes | Repair or replace 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 [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 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 POOR CONNECTION OF PCM CONNECTOR • Turn the ignition switch off. • Disconnect PCM connector. • Inspect for poor connection (damaged, pulled-out terminals, corrosion, etc.). • 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 and PCM terminal 1Z. • 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 DTC from PCM memory using WDS or equivalent. • Drive vehicle above 60.1 km/h {37.3 mph} for 1 min.
• Verify that ECT PID above 60 °C {140 °F} using WDS or equivalent.
• Is PENDING CODE of same DTC present?
Yes
Replace PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [L3].)
No | Go to the next step.
9 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [L3].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [L3].)
No | Troubleshooting completed.