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DTC P0550 [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513)

BME010200500205

DTC P0550 | PSP switch circuit malfunction
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DETECTION CONDITION | • The PCM monitors PSP switch signal at PCM terminal 31. If input voltage is low voltage (switch stays on) for 1 min. when the VSS is above 60.1 km/h {37.3 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).
• MIL illuminates if PCM detects the above malfunction condition in two consecutive drive cycles.
• 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 • Short to ground between PSP switch terminal and PCM terminal 31 • 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 PSP SWITCH • Perform PSP switch inspection. (See POWER STEERING PRESSURE (PSP) SWITCH INSPECTION [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).) • Is the PSP switch normal? | Yes | Go to the next step.
No | Replace the PSP switch, then go to Step 5.
4 | INSPECT PSP SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND • Disconnect PCM connector. • Inspect for continuity between PSP switch terminal (wiring harness-side) and body ground. • Is there continuity? | Yes | Repair or replace the wiring harness for short to ground, then go to the next step.
No | Go to the next step.
5 | 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 the vehicle above 60.1 km/h {37.3 mph} for 1 min.
• Verify that ECT PID above 60 °C {140 °F} using the WDS or equivalent.
• Is the PENDING CODE of same DTC present?
Yes
Replace the PCM, then go to the next step.
No | Go to the next step.
6 | VERIFY AFTER REPAIR PROCEDURE • Perform "After Repair Procedure". (See AFTER REPAIR PROCEDURE [AJ].) • Is there any DTC present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JMZ LW19J7*# 300001-, JM0 LW10J300 300001-301405, JM6 LW10J300 300001-, JM8 LW28J**# 300001-301513).)
No | Troubleshooting completed.