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Home >> Cadillac >> 1993 >> Sixty Special >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Testing >> Cruise Control Servo Test >> Servo Does Not Pull In
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Servo Does Not Pull In

  1. Check for at least 10 in. Hg of supply vacuum. Check for leaks. Check for binding or restricted cruise control cable. Repair as necessary. Disconnect vacuum release hose from servo. Plug vacuum release port. Re-try servo override test as specified in PRELIMINARY TEST (run engine at idle for 2 minutes before testing). If servo fully retracts, repair or replace vacuum release valve or hose.
  2. If servo does not pull in, press HI and LOW buttons simultaneously. Display should show ".7.0", indicating system is ready to enter available modes. Press HI blower button once. Display should show "E.9.5", indicating system is in PCM output cycling mode.
  3. Cycle through tests by pressing HI or LO blower button until display shows "E.0.8", indicating system is in VAC SOLENOID cycling mode. Display should alternately show "E.9.6" and "E.0.8", and vacuum solenoid should cycle on and off. If vacuum solenoid does not cycle on and off, diagnose Code E62. See appropriate G - TEST W/CODES article in the ENGINE PERFORMANCE Section.
  4. If vacuum solenoid cycles on and off, cycle through tests by pressing HI or LO blower button until display shows "E.0.7", indicating system is in VENT SOLENOID cycling mode. Display should alternately show "E.9.6" and "E.0.7", and vent solenoid should cycle on and off.
  5. If vent solenoid does not cycle, diagnose Code E61. See appropriate G - TEST W/CODES article in the ENGINE PERFORMANCE Section. If vent solenoid cycles, press HI and LO blower buttons simultaneously. Display should show ".7.0", indicating system is ready to enter available modes.
  6. Press LO blower button once. Display should show "E.9.0", indicating system is in PCM data mode. Press HI blower button once. Display should show "P.0.1". Cycle through tests by pressing HI or LO blower button until display shows "P.2.1", indicating system is in PCM data CRUISE FEEDBACK mode.
  7. With relaxed servo, note digital display. If display reads from 0 to 6, diagnose Code E65. See appropriate G - TEST W/CODES article in the ENGINE PERFORMANCE Section. If display reads from 31 to 90, check servo. If servo is okay, replace PCM.
  8. If display reads from 7 to 30, manually press servo until fully retracted. Note digital display. If display reads from 30 to 80, replace servo. If display reads from 81 to 99, no fault is present.
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