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Home >> Jeep >> 1996 >> Cherokee Classic, Part Time, Automatic >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.0L >> Diagnostic Trouble Code (DTC) Identification >> Test TC-87A - Speed Control Switch Always Low
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Test TC-87A - Speed Control Switch Always Low

NOTE: For connector terminal identification, refer to CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article in this section.
  1. Using scan tool, clear DTCs. Turn ignition off. Using scan tool, read Speed Control (S/C) switch sensor voltage. If voltage is less than one volt, go to step 3). If voltage is one volt or more, go to next step.
  2. Condition required to set DTC not present at this time. SPEED CONTROL SWITCHES DTC sets if PCM senses actual switch state does not match intended switch state. Possible causes are: shorted switch circuit, defective PCM, open switch ground circuit or shorted/open switch. See INACTIVE DTC CONDITION . Test is complete. Perform verification TEST VER-4A .
  3. Disconnect S/C switch connector. Inspect connector and terminals for damage. Repair connector and terminals as necessary and perform TEST VER-4A . If connector and terminals are okay, go to next step.
  4. Read S/C switch sensor voltage. If voltage changes to 5 volts, replace S/C switch and perform TEST VER-4A. If voltage does not change to 5 volts, go to next step.
  5. Turn ignition off. Disconnect Powertrain Control Module (PCM) connectors. Inspect connectors and terminals for damage. Repair connectors and terminals as necessary and perform TEST VER-4A . If connectors and terminals are okay, go to next step.
  6. Using an external ohmmeter, check resistance between PCM Gray connector, S/C switch signal circuit (White/Light Green wire) and PCM Black connector, ground circuit (Black/Light Blue wire). If resistance is 5 ohms or more, replace PCM and perform TEST VER-4A . If resistance is less than 5 ohms, repair S/C switch signal circuit shorted to ground circuit and perform TEST VER-4A.
NOTE: A break in test sequence occurs at this point. Sequence skips from TEST TC-87A to TEST TC-101A. No tests have been omitted.
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