LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> BMW >> 1979 >> 528i Automatic Trans >> Repair and Diagnosis >> Engine Performance >> Ignition System >> BOSCH Electronic Ignition >> Electronic Control Module Check >> All Other Models
April 5, 2026: LEMON Manuals is launched! Read the announcement.

All Other Models

  1. To check electronic control module voltage, Disconnect electronic control module harness connector. Connect a voltmeter to harness connector terminal No. 15 and ground. Voltage should read within battery voltage. If not, check voltage drop in harness between ignition switch and electronic control module.
  2. To check electronic control module ground, disconnect connector at electronic control module. Connect voltmeter between terminal No. 31 and ground. Voltmeter should read zero (0) volts. Check module ground wire. Repair as necessary.
scientia non olet · About LEMON Manuals