Subaru Legacy BN/BS (2015-2019) Service Manual: Dtc p0616 starter relay "a" circuit low

Subaru Legacy BN/BS (2015-2019) Service Manual / Engine (diagnostics)(h6do) / Diagnostic procedure with diagnostic trouble code (dtc) / Dtc p0616 starter relay "a" circuit low

1. MODEL WITHOUT PUSH BUTTON START

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

Failure of engine to start

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 EZ (WITHOUT PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK FOR ANY OTHER DTC ON DISPLAY.	Is any other DTC displayed-	Check DTC using “List of Diagnostic Trouble Code (DTC)”. List of Diagnostic Trouble Code (DTC)	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0616 STARTER RELAY "A" CIRCUIT LOW
2.CHECK HARNESS BETWEEN ECM AND STARTER RELAY CONNECTOR. 1) Turn the ignition switch to OFF. 2) Disconnect the F/B (starter relay) connector. 3) Disconnect the connectors from ECM and starter motor. 4) Measure the resistance of harness between ECM connector and F/B (starter relay) connector. Connector & terminal (B134) No. 46 — (B159) No. 4:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0616 STARTER RELAY "A" CIRCUIT LOW	Repair the harness and connector. NOTE: In this case, repair the following item: • Open circuit of harness between ECM connector and starter relay connector • Poor contact of coupling connector
3.CHECK HARNESS BETWEEN ECM AND STARTER RELAY CONNECTOR. Measure the resistance between ECM connector and chassis ground. Connector & terminal (B134) No. 46 — Chassis ground:	Is the resistance 1 M- or more-	Repair the poor contact of ECM connector.	Repair the short circuit to ground in harness between ECM connector and starter relay connector.

2. MODEL WITH PUSH BUTTON START

DTC DETECTING CONDITION:

Immediately at fault recognition

TROUBLE SYMPTOM:

Failure of engine to start

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 EZ (WITH PUSH BUTTON START) Engine Electrical System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK HARNESS BETWEEN ECM AND STARTER RELAY CONNECTOR. 1) Turn the ignition to OFF. 2) Disconnect the connector from ECM. 3) Remove the starter relay. 4) Measure the resistance of harness between ECM connector and starter relay connector. NOTE: Place the select lever in “P” range or “N” range. Connector & terminal (B164) No. 58 — (B159) No. 4:	Is the resistance less than 1 --	Diagnostic Procedure with Diagnostic Trouble Code (DTC) > DTC P0616 STARTER RELAY "A" CIRCUIT LOW	Repair the harness and connector. NOTE: In this case, repair the following item: • Open circuit of harness between ECM connector and starter relay connector • Poor contact of coupling connector
2.CHECK HARNESS BETWEEN ECM AND STARTER RELAY CONNECTOR. 1) Disconnect the connector from starter motor. 2) Measure the resistance between ECM connector and chassis ground. Connector & terminal (B134) No. 58 — Chassis ground:	Is the resistance 1 M- or more-	Repair the poor contact of ECM connector.	Repair the short circuit to ground in harness between ECM connector and starter relay connector.

3. OUTLINE OF DIAGNOSIS

• Model without push button start

Detect abnormal continuity in the starter SW1.

Judge as OFF NG when the starter SW 1 signal remains OFF.

• Model with push button start

Detect abnormal continuity in the starter SW 2.

Judge as OFF NG when the starter SW 2 signal remains OFF.

4. EXECUTION CONDITION

Secondary Parameters	Execution condition
Battery voltage	≥ 8 V
Engine speed	Increase from 0 rpm to 500 rpm or more
Vehicle speed	< 1 km/h (0.6 MPH)
Starter relay command	ON

5. GENERAL DRIVING CYCLE

Perform the diagnosis only once after the enable conditions have been established.

6. DIAGNOSTIC METHOD

Judge as OFF NG when the following conditions are established.

Judgment Value

Malfunction Criteria

Threshold Value

Starter SW1 signal with battery voltage - 0.6 or more (models without push button start)

Starter SW2 signal with battery voltage - 0.6 or more (models with push button start)

Not detected

Time Needed for Diagnosis: Less than 1 second

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

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Other materials:

Inspection
1. Measure the resistance between switch terminals.Preparation tool:Circuit testerTerminal No.Inspection conditionsStandard1 — 4Switch OFF1 M- or moreSwitch ONLess than 1 -2. Apply battery voltage between the connector terminals to check lighting condition of illumination inside the switch.Termina ...