Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0351 ignition coil "a" primary control circuit/open

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h4do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0351 ignition coil "a" primary control circuit/open

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

• Improper idling

• Poor driving performance

CAUTION:

After servicing or replacing faulty parts, perform Clear Memory Mode Clear Memory Mode > OPERATION, and Inspection Mode Inspection Mode > PROCEDURE.

WIRING DIAGRAM:

• Engine Electrical System ENGINE TYPE FB (WITHOUT PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

• Engine Electrical System ENGINE TYPE FB (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

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. 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 voltage 10 V or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0351 IGNITION COIL "A" PRIMARY CONTROL CIRCUIT/OPEN	Repair the harness and connector. NOTE: In this case, repair the following item: • Open or short to ground in harness of power supply circuit • Blown out of fuse • Poor contact of IG relay connector • Poor contact of coupling connector • Faulty IG relay
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. 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 resistance less than 5 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0351 IGNITION COIL "A" PRIMARY CONTROL CIRCUIT/OPEN	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. 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 1 M- or more-	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0351 IGNITION COIL "A" PRIMARY CONTROL CIRCUIT/OPEN	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; (E158) No. 37 — (E31) No. 2: DTC P0352; (E158) No. 35 — (E32) No. 2: DTC P0353; (E158) No. 38 — (E33) No. 2: DTC P0354; (E158) No. 36 — (E34) No. 2:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0351 IGNITION COIL "A" PRIMARY CONTROL CIRCUIT/OPEN	Repair the open circuit in harness between ECM connector and ignition coil 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.	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0351 IGNITION COIL "A" PRIMARY CONTROL CIRCUIT/OPEN
6.CHECK SPARK PLUG CONDITION. 1) Remove the spark plug of the corresponding cylinder. Spark Plug > REMOVAL 2) Check the spark plug condition. Spark Plug > INSPECTION	Is the spark plug condition normal-	Replace the ignition coil. Ignition Coil	Replace the spark plug. Spark Plug

1. OUTLINE OF DIAGNOSIS

Based on the self-diagnostic result of the ignition coil driving IC, judge the ignition coil driving circuit as normal or abnormal.

The ignition coil driving IC detects “no ignition” status as a malfunction.

2. EXECUTION CONDITION

Secondary Parameters	Execution condition
Battery voltage	≥ 10.9 V
Elapsed time after starting the engine	> 1 s
Engine speed	> 500 rpm

3. GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

4. DIAGNOSTIC METHOD

Judge as NG when the following conditions are established.

Judgment Value

Malfunction Criteria	Threshold Value
Ignition driving IC information	Trouble

Time Needed for Diagnosis: 256/1000 seconds - 10 time(s)

Malfunction Indicator Light Illumination: Illuminates as soon as a malfunction occurs.

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