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.
P0580-SPEED CONTROL SWITCH NO. 1 LOW DIAGNOSTIC TEST REFERENCE
| TEST | ACTION | APPLICABILITY |
|---|---|---|
| 1 |
NOTE:
Do not press any of the Speed Control Switch buttons. Ignition on, engine not running.With the DRBIII®, read the Speed Control voltage.Is the Speed Control voltage below 1.0 volt?Yes --> Go To 2No --> Refer to the INTERMITTENT CONDITION SYMPTOM .Perform POWERTRAIN VERIFICATION TEST VER - 4 . |
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| 2 | With the DRBIII®, monitor the Speed Control Switch voltage. Disconnect the Speed Control On/Off Switch harness connector. Did the voltage change to above 4.7 volts? Yes --> Replace the Speed Control On/Off Switch. Perform POWERTRAIN VERIFICATION TEST VER - 4 . No --> Go To 3 |
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| 3 | With the DRBIII®, monitor the Speed Control Switch voltage. Disconnect the Speed Control Resume/Accel Switch harness connector. Did the voltage change to above 4.7 volts? Yes --> Replace the Speed Control Resume/Accel Switch. Perform POWERTRAIN VERIFICATION TEST VER - 4 . No --> Go To 4 |
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| 4 | Turn the ignition off. Disconnect the clockspring 6-way harness connector (instrument panel wiring side) per Service Information. Ignition on, engine not running. With the DRBIII® in Sensors, read the S/C Switch voltage. Did the S/C Switch volts change to 5.0 volts? Yes --> Replace the Clockspring. Perform POWERTRAIN VERIFICATION TEST VER - 4 . No --> Go To 5 |
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| 5 | Turn the ignition off. Connect the Clockspring harness connector per Service Information. 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 the resistance between the (K900) Sensor ground circuit and the (V37) S/C Signal circuit at the Speed Control Switch. Is the resistance below 5.0 ohms? Yes --> Repair the (V37) S/C Signal circuit shorted to the (K900) Sensor ground circuit. Perform POWERTRAIN VERIFICATION TEST VER - 4 . No --> Go To 6 |
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| 6 |
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 the resistance between ground and the (V37) S/C Signal circuit at the appropriate terminal of special tool #8815.Is the resistance below 5.0 ohms?Yes --> Repair the short to ground in the (V37) S/C Signal circuit.Perform POWERTRAIN VERIFICATION TEST VER - 4 .No --> Go To 7 |
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| 7 |
NOTE:
Before continuing, disconnect the PCM harness connector and check the related wiring 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 - 4 . |
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