LEMON Manuals: Even more car manuals for everyone
Home >> Subaru >> 2013 >> Legacy Premium, Automatic CVT Trans >> Repair and Diagnosis >> External Pages >> Different car >> Section 37 (Engine Controls (Diagnostics) (H4DOTC)) >> Diagnostic Procedure with Diagnostic Trouble Code (DTC) >> DTC P0351 Ignition Coil A Primary/Secondary Circuit >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2013 Subaru Forester. However, it is still accessible from the selected car via links, so may be relevant.
DIAGNOSTIC PROCEDURE

Step Check Yes No
1 CHECK IGNITION COIL POWER SUPPLY CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Disconnect the connector from ignition coil.
  3. Turn the ignition switch to ON.
  4. Measure the voltage between ignition coil connector and engine ground.

    Connector & terminal 

    DTC P0351; (E31) No. 3 (+) - Engine ground (-): 

    DTC P0352; (E32) No. 3 (+) - Engine ground (-): 

    DTC P0353; (E33) No. 3 (+) - Engine ground (-): 

    DTC P0354; (E34) No. 3 (+) - Engine ground (-): 

 Is the voltage 10 V or more? Go to step 2.  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit or short circuit to ground in harness of power supply circuit
  • Blown out of fuse
  • Poor contact of coupling connector
2 CHECK HARNESS OF IGNITION COIL GROUND CIRCUIT. 
  1. Turn the ignition switch to OFF.
  2. Measure the resistance of harness between ignition coil connector and engine ground.

    Connector & terminal 

    DTC P0351; (E31) No. 2 - Engine ground: 

    DTC P0352; (E32) No. 2 - Engine ground: 

    DTC P0353; (E33) No. 2 - Engine ground: 

    DTC P0354; (E34) No. 2 - Engine ground: 

 Is the resistance less than 5 Ω? Go to step 3.  Repair the open circuit in harness between ignition coil connector and engine grounding terminal.
3 CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR. 
  1. Disconnect the connector from ECM.
  2. Measure the resistance between ignition coil connector and engine ground.

    Connector & terminal 

    DTC P0351; (E31) No. 1 - Engine ground: 

    DTC P0352; (E32) No. 1 - Engine ground: 

    DTC P0353; (E33) No. 1 - Engine ground: 

    DTC P0354; (E34) No. 1 - Engine ground: 

 Is the resistance 1 MΩ or more? Go to step 4.  Repair the ground short circuit of harness between ECM connector and ignition coil connector.
4 CHECK HARNESS BETWEEN ECM AND IGNITION COIL CONNECTOR. 
Measure the resistance of harness between ECM connector and ignition coil connector.
Connector & terminal 
DTC P0351; (B134) No. 21 - (E31) No. 1: 
DTC P0352; (B134) No. 22 - (E32) No. 1: 
DTC P0353; (B134) No. 31 - (E33) No. 1: 
DTC P0354; (B134) No. 32 - (E34) No. 1: 		 Is the resistance less than 1 Ω? Go to step 5.  Repair the harness and connector.
NOTE: In this case, repair the following item:
  • Open circuit of harness between ECM connector and the ignition coil connector
  • Poor contact of coupling connector
5 CHECK FOR POOR CONTACT. 
Check for poor contact of ECM connector.		 Is there poor contact of ECM connector? Repair the poor contact of ECM connector. Go to step 6. 
6 CHECK SPARK PLUG CONDITION. 
  1. Remove the spark plug of the corresponding cylinder. < Refer to REMOVAL , Spark Plug. >
  2. Check the spark plug condition. < Refer to INSPECTION , Spark Plug. >
 Is the spark plug condition normal? Replace the ignition coil. < Refer to IGNITION COIL . > Replace the spark plug. < Refer to SPARK PLUG . >
scientia non olet · About LEMON Manuals