LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Cadillac >> 1982 >> Cimarron Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> DELCO-REMY Electronic Spark Timing (Est) Ignition System >> Testing >> ESC System Check
April 5, 2026: LEMON Manuals is launched! Read the announcement.

ESC System Check

NOTE: For HEI-EST systems with Electronic Spark Control (ESC), perform step 1  ) through  4) of EST Emission System Check prior to beginning these tests.
  1. If complaint is "No Timing Change", proceed to step  4). If complaint is "Failure to Start", turn ignition switch "ON". Attach positive lead of voltmeter to terminal "F" of ESC controller, with negative lead touching terminal "K" of controller. See Figure. If reading is under 10 volts, check for open condition from terminal "K" to ground and from terminal "F" to battery supply. Also check fuses.
  2. If reading was over 10 volts, install a jumper wire between terminals "J" and "G" on ESC controller. Reconnect 4-wire EST connector and try to start the engine.
  3. If engine starts, replace either defective ESC controller or its connector. If engine still will not start, check for open condition from ECM terminal "U" to ground. Also check for open or grounded wire to ECM terminal "12". If wires are OK, replace defective ECM or its connector.
  4. If complaint was "No Timing Change", install a jumper wire between ESC controller terminals "C" and "D". Place shift lever in "P" (auto, trans.) or Neutral (man. trans.) and run engine at fast idle speed. Check for timing change as 4-wire EST connector is disconnected. If timing changes, replace faulty ESC controller or its connector. If there is no change, check for the presence of a Park-Neutral switch.
  5. If there is no Park-Neutral switch, check for open condition in wire from ECM terminal "11" to EST connector terminal "C". If wire is OK, replace defective ECM or its connector.
  6. If vehicle has a Park-Neutral switch, disconnect it and recheck timing change as outlined in step  4). If change occurs, replace defective Park-Neutral switch or adjust it properly. If no timing change takes place, check for grounded wire from ECM terminal "H" to Park-Neutral switch. Check for open wire from ECM terminal "11" to EST connector terminal "C". If wire is OK, replace defective ECM or its connector.
scientia non olet · About LEMON Manuals