Nissan Sentra. Manual - part 426

EC-400

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P1650 STARTER MOTOR RELAY 2

3.

PERFORM DTC CONFIRMATION PROCEDURE FOR MALFUNCTION B

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.

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

INFOID:0000000009758655

1.

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"

 (with-

out intelligent key).

NO

>> GO TO 2.

2.

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.

P1650 STARTER MOTOR RELAY 2

EC-401

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

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.

5. 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.

+

−

Continuity

IPDM E/R

ECM

Connector

Terminal

Connector

Terminal

E46

44

E16

105

Existed

EC-402

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

P1651 STARTER MOTOR RELAY

P1651 STARTER MOTOR RELAY

Description

INFOID:0000000009758656

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 by CAN communication.

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

• Engine is running.

• Selector lever is D position. (CVT models)

• Clutch pedal is fully released. (M/T models)

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

INFOID:0000000009758657

DTC DETECTION LOGIC

NOTE:

• If DTC P1651 is displayed with DTC U1001, perform the trouble diagnosis for DTC U1001. Refer to 

EC-169,

"DTC Logic"

.

• If DTC P1651 is displayed with DTC P0607, perform the trouble diagnosis for DTC P0607. Refer to 

EC-350,

"DTC Logic"

.

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

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

2. Start the engine and let it idle at least 30 seconds.

3. Check 1st trip DTC.
Is 1st trip DTC detected?

YES

>> Proceed to 

EC-402, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009758658

1.

INSPECTION START

Check the starter motor operation.
Is the starter motor operated?

YES

>> GO TO 3.

NO

>> GO TO 2.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1651

STR MTR RELAY
(Starter motor relay)

A correlated error is detected for 2 sec-
onds or more between a control signal 
transmitted from ECM and a feedback sig-
nal transmitted from IPDM E/R via CAN 
communication line.

• Harness or connectors

(Between ECM harness connector and 
IPDM E/R harness connector is short-
ed to power.)

• IPDM  E/R

P1651 STARTER MOTOR RELAY

EC-403

< DTC/CIRCUIT DIAGNOSIS >

[MRA8DE]

C

D

E

F

G

H

I

J

K

L

M

A

EC

N

P

O

2.

CHECK DTC WITH IPDM E/R

Check DTC with IPDM E/R. Refer to 

PCS-10, "CONSULT Function (IPDM E/R)"

 (with intelligent key), or 

PCS-

38, "CONSULT Function (IPDM E/R)"

 (without intelligent key).

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Perform trouble diagnosis for DTC indicated. Refer to 

PCS-20, "DTC Index"

 (with intelligent key),

or 

PCS-48, "DTC Index"

 (without intelligent key).

3.

CHECK CRANKING REQUEST SIGNAL CIRCUIT-1

1. Turn ignition switch OFF.

2. Disconnect ECM harness connector.

3. Disconnect IPDM E/R harness connector.

4. Check the continuity between ECM harness connector and IPDM E/R harness connector.

5. Also check harness for short to ground to power.
Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

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.

+

−

Continuity

ECM

IPDM E/R

Connector

Terminal

Connector

Terminal

E16

101

E46

37

Existed