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DTC P0550 [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed))

BME010200500W06

DTC P0550 | PSP switch circuit malfunction
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DETECTION CONDITION | • The PCM monitors PSP switch signal at PCM terminal 55. If input voltage is low voltage (switch stays on) for 1 minute 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).
• The MIL illuminates if the PCM detects the 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 is available.
• DTC is stored in PCM memory.
POSSIBLE CAUSE | • PSP switch malfunction • Connector or terminal malfunction • Short to ground between PSP switch terminal and PCM terminal 55 • 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 REPAIR INFORMATION AVAILABILITY • Check for related Service Information and/or on-line repair information availability. • Is any related repair information available? | Yes | Perform repair or diagnosis according to the available repair information. • If the 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: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed)).) • Is PSP switch normal? | Yes | Go to the next step.
No | Replace PSP switch, then go to Step 5.
4 | INSPECT PSP SWITCH SIGNAL CIRCUIT FOR SHORT TO GROUND • Disconnect PCM connector. • Check continuity between PSP switch terminal (harness-side) and body ground. • Is there continuity? | Yes | Repair or replace 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 engine. • Clear the DTC from the PCM memory using the WDS or equivalent. • Drive vehicle above 60.1 km/h {37.3 mph} for 1 minutes.
• 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.
No | Go to the next step.
6 | VERIFY AFTER REPAIR PROCEDURE • Perform the "After Repair Procedure". (See AFTER REPAIR PROCEDURE [AJ].) • Are any DTCs present? | Yes | Go to the applicable DTC inspection. (See DTC TABLE [AJ] (VIN: JM0 LW10J300 301406-, JMZ LW69J7*# 307683-, JM8 LW28J**# 301514-, JM8 LW28A**# 301514- (Assumed)).)
No | Troubleshooting completed.