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Home >> Mercedes Benz >> 2001 >> S430 >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0303: Misfire Cylinder 3 Or Misfire Cylinder 3 Damaging To TWC >> Testing Procedure (Ignition Coil T1/3)

Testing Procedure (Ignition Coil T1/3)

  1. Primary Circuits A & B, Ignition Coil (T1/3) -  Connect oscilloscope between ME-SFI control module connector "F" terminal No. 5 (socket box terminal No. 109) and ME-SFI control module connector "A" terminal No. 2 (socket box terminal No. 2). Observe oscilloscope while operating starter. Voltage should be 200-350 volts.
  2. Connect oscilloscope between ME-SFI control module connector "F" terminal No. 4 (socket box terminal No. 108) and ME-SFI control module connector "A" terminal No. 2 (socket box terminal No. 2). Observe oscilloscope while operating starter. Voltage should be 200-350 volts. If voltage is within specification, go to Testing Procedure (Ignition Coil Ignition Voltage T1/1 To T1/8)  . If voltage is not within specification, go to next step.
  3. Primary Circuits A & B, Primary Winding Of Ignition Coil (T1/3) -  Turn ignition off. Connect DVOM between ME-SFI control module connector "F" terminals No. 4 and 5 (socket box terminals No. 108 and 109). Resistance should be 0.9-1.6 ohms (resistance value of both primary circuits). Resistance of primary winding A or B individually is approximately 0.6 ohms at 68°F (20°C). If resistance is within specification, test is complete. If resistance is not within specification, possible causes are wiring harness failure or ignition coil (T1/3) defective. Repair as necessary.
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