Nissan Sentra manuals

Nissan Sentra Service Manual: P1650 Starter motor relay 2

Description

ECM controls ON/OFF state of the starter relay, according to the engine and vehicle condition. ECM transmits a control signal to IPDM E/R via BCM by CAN communication.

Under normal conditions, ECM controls and maintains the starter relay in OFF state during following condition:

When detecting a decrease in engine speed due to rapid deceleration or heavy load condition, ECM controls and reactivates the starter relay.

IPDM E/R detects a control state of starter relay and starter control relay and transmits a feedback signal to ECM via CAN communication.

DTC Logic

DTC DETECTION LOGIC

NOTE:

DTC No.

CONSULT screen terms (Trouble diagnosis content)

DTC detecting condition

Possible cause

P1650 STR MTR RELAY 2 (Starter motor relay 2) A Starter relay is stuck ON.
  • Harness and connectors (Between IPDM E/R harness connector and BCM harness connector is shorted to ground.)
  • IPDM E/R
B Starter relay power supply circuit is excessively high voltage.
  • Harness and connectors (Between IPDM E/R harness connector and BCM harness is open or shorted to power.) (Between IPDM E/R harness connector and battery is open.)
  • IPDM E/R
C Starter relay circuit is excessively low voltage
  • Harness and connectors (Starter relay circuit is open or shorted.)
  • IPDM E/R

DTC CONFIRMATION PROCEDURE

1.PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always perform the following procedure before conducting the next test

  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.

>> GO TO 2.

2.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION A AND C

  1. Turn ignition switch OFF and wait at least 10 seconds.
  2. Turn ignition switch ON.
  3. Turn ignition switch OFF and wait at least 10 seconds.
  4. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-400, "Diagnosis Procedure".

NO >> GO TO 3.

3.PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

CAUTION: With CONSULT


CAUTION:

Always drive at a safe speed.

  1. Start the engine.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Turn ignition switch ON.
  4. Start the engine and warm it up to normal operating temperature.
  5. Turn ignition switch OFF.
  6. Lift up drive wheels.
  7. Turn ignition switch ON.
  8. Select “POWER BALANCE” in “ACTIVE TEST” mode of “ENGINE” using CONSULT.
  9. Restart the engine and let it idle at least 10 seconds.
  10. Shift the selector lever to D position while depressing fully the brake pedal.
  11. Select 1 - 4 cylinders in “POWER BALANCE” and cut the fuel of all cylinders.
  12. Check 1st trip DTC.

CAUTION:Without CONSULT


CAUTION:

Always drive at a safe speed.

  1. Start the engine.
  2. Turn ignition switch OFF and wait at least 10 seconds.
  3. Turn ignition switch ON.
  4. Start the engine and warm it up to normal operating temperature.
  5. Turn ignition switch OFF.
  6. Lift up drive wheels
  7. Restart the engine and let it idle at least 10 seconds
  8. For CVT models: Shift the selector lever to D position while depressing fully the brake pedal.

    For M/T models: Fully release the clutch pedal.

  9. Disconnect vacuum hoses from intake manifold.
  10. Check 1st trip DTC.

Is 1st trip DTC detected? YES >> Proceed to EC-400, "Diagnosis Procedure".

NO >> INSPECTION END

Diagnosis Procedure

1.CHECK SELF-DIAGNOSTIC RESULT IN BCM

Check self-diagnostic result in BCM. With CONSULT


Check self-diagnostic result in BCM.

Are any DTC detected? YES >> Check the DTC. Refer to PCS-20, "DTC Index" (with intelligent key), PCS-48, "DTC Index" (without intelligent key).

NO >> GO TO 2.

2.CHECK SELF-DIAGNOSTIC RESULT IN IPDM E/R

Check self-diagnostic result in IPDM E/R. With CONSULT


Check self-diagnostic result in IPDM E/R.

Are any DTC detected? YES >> Check the DTC. Refer to BCS-49, "DTC Index" (with intelligent key), BCS-109, "DTC Index" (without intelligent key).

NO >> GO TO 3.

3.CHECK STARTER RELAY POWER SUPPLY CIRCUIT

Check the starter motor relay power supply circuit. Refer to PCS-29, "Diagnosis Procedure" (with intelligent key), or PCS-57, "Diagnosis Procedure" (without intelligent key).

Is the inspection result normal? YES >> GO TO 4.

NO >> Repair or replace error-detected parts.

4.CHECK STARTER RELAY CONTROL SIGNAL CIRCUIT

  1. Turn ignition switch OFF.
  2. Disconnect IPDM E/R harness connector.
  3. Disconnect ECM harness connector.
  4. Check the continuity between IPDM E/R harness connector and ECM harness connector.


  1. Also check harness for short to ground to power.

Is the inspection result normal? YES >> GO TO 5.

NO >> Repair or replace error-detected parts.

5.CHECK INTERMITTENT INCIDENT

Check intermittent incident. Refer to GI-39, "Intermittent Incident".

Is the inspection result normal? YES >> Replace IPDM E/R. Refer to PCS-30, "Removal and Installation".

NO >> Repair or replace error-detected parts.

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