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Home >> Cadillac >> 1982 >> Cimarron Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> DELCO-REMY Electronic Spark Timing (Est) Ignition System >> Testing >> ESC Performance Check
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ESC Performance Check

NOTE: Perform these checks only after checking other causes of engine detonation, such as ignition timing, lack of EGR, or engine temperature.
  1. Connect tachometer to engine and run at fast idle speed (about 1500 RPM). Place shift lever "P" (auto, trans.) or Neutral (man. trans.). With engine at normal operating temperature, tap engine block in area of detonation sensor. If engine RPM drops, system is operating properly.
  2. If RPM did not drop, disconnect ESC controller and check for RPM change. If no change in RPM, proceed to step  4). If RPM drops, turn ignition switch "OFF" and check resistance between ESC harness connector pins "B" and "K". Resistance should be 175-375 ohms. If resistance is OK, replace ESC harness connector or ESC controller.
  3. If resistance was not OK, check for open circuit from ESC connector pin "K" to ground. If no open circuit exists, check resistance of detonation sensor. Resistance should be 175-375 ohms. If not, replace detonation sensor. If OK, repair faulty connection, open or ground in wire from detonation sensor to ESC terminal "B".
  4. If no change in RPM in step  2), note "CHECK ENGINE" light. If light is on, problem is most likely a faulty ESC controller, but also check detonation sensor. If light is off, turn ignition switch "ON" (engine not running) and check voltage from ground to ESC terminal "J".
  5. If voltage is under 2 volts, replace ECM. If voltage is over 2 volts, repair short in wire from ESC terminal "J" to ECM terminal "L".
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