Diagnostic Procedure
WARNING: This page is about a different car, the 2005 Jeep Liberty. However, it is still accessible from the selected car via links, so may be relevant.
P0551-POWER STEERING SWITCH PERFORMANCE DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 | Ignition on, engine not running. With the DRBIII®, read DTCs and record the related Freeze Frame data. Is the Good Trip Counter displayed and equal to zero? Yes --> Go To 2 No --> Refer to the INTERMITTENT CONDITION SYMPTOM . Perform POWERTRAIN VERIFICATION TEST VER - 2 . |
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| 2 | Turn the ignition off. Disconnect the Power Steering Pressure Switch harness connector. Ignition on, engine not running. Connect a jumper wire to the (K66) P/S Switch Signal circuit in harness connector. Using the DRBIII®, monitor the Power Steering Pressure Switch. Touch the jumper wire to the (Z939) Ground circuit in the Power Steering Pressure Switch harness connector several times. Did the Power Steering Pressure Switch status change from High to Low? Yes --> Replace the Power Steering Pressure Switch. Perform POWERTRAIN VERIFICATION TEST VER - 2 . No --> Go To 3
NOTE:
Remove the jumper wire before continuing.
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| 3 | Turn the ignition off. Disconnect the C3 PCM harness connector.
CAUTION:
DO NOT PROBE THE PCM HARNESS CONNECTORS. PROBING THE PCM HARNESS CONNECTORS WILL DAMAGE THE PCM TERMINALS RESULTING IN POOR TERMINAL TO PIN CONNECTION. INSTALL MILLER SPECIAL TOOL #8815 TO PERFORM DIAGNOSIS. Measure resistance of (K66) P/S Switch Signal circuit from the Power Steering Pressure Switch harness connector to the appropriate terminal of special tool #8815. Is the resistance below 5.0 ohms? Yes --> Go To 4 No --> Repair the open in the (K66) P/S Switch Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 2 . |
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| 4 | Measure the resistance between ground and the (K66) P/S Pressure Switch Signal circuit at the P/S Pressure Switch connector. Is the resistance below 100 ohms? Yes --> Repair the short to ground in the (K66) P/S Switch Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 2 . No --> Go To 5 |
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| 5 | Measure the resistance between ground and the (Z939) Ground circuit at the Power Steering Pressure Switch connector. Is the resistance below 5.0 ohms? Yes --> Go To 6 No --> Repair the open in the (Z939) Ground circuit. Perform POWERTRAIN VERIFICATION TEST VER - 2 . |
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| 6 |
NOTE:
Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Using the schematics as a guide, inspect the wire harness and connectors. Pay particular attention to all Power and Ground circuits.If there are no possible causes remaining, view repair.RepairReplace and program the Powertrain Control Module per Service Information.Perform POWERTRAIN VERIFICATION TEST VER - 2 . |
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