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Home >> Buick >> 2000 >> Century Custom >> Repair and Diagnosis >> Accessories & Equipment >> Cruise Control Systems >> Self-Diagnostic System >> Diagnostic System Check

Diagnostic System Check

  1. Ensure battery condition, cold cranking amperage and reserve capacity meet specifications. Replace as necessary. Install scan tool. If scan tool powers up, go to next step. If scan tool does not power up, see appropriate BODY CONTROL MODULES article.
  2. Turn ignition on, engine off. Try to establish scan tool communication with Powertrain Control Module (PCM). If communication with PCM is established, go to next step. If communication with PCM is not established, see appropriate BODY CONTROL MODULES article.
  3. Select display DTC function for PCM. Record all displayed DTCs and status of displayed DTCs. If DTCs are displayed, go to next step. If no DTCs are displayed, see appropriate SELF-DIAGNOSTICS article in ENGINE PERFORMANCE.
  4. Retrieve codes and perform appropriate test. See DIAGNOSTIC TROUBLE CODE (DTC) INDEX  table.
DIAGNOSTIC TROUBLE CODE (DTC) INDEX

DTC (1) Description
P1554  Cruise Control Feedback Circuit
P1585  Cruise Inhibit Output Circuit
(1) For any DTC beginning with the letter "U", see appropriate BODY CONTROL MODULES article.
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