Nissan Quest E52. Manual - part 541

EC-374

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1650 STARTER MOTOR RELAY 2

P1650 STARTER MOTOR RELAY 2

Description

INFOID:0000000009651223

ECM controls ON/OFF state of the starter relay, according to the engine and vehicle condition. Models with no
Intelligent Key System transmit a control signal directly to IPDM E/R. On the other hand, models with the Intel-
ligent Key System transmit a control signal to IPDM E/R by way of BCM via CAN communication.
Under normal conditions, ECM controls and maintains the starter relay in OFF state during engine running or
“D” position. 
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:0000000009651224

DTC DETECTION LOGIC

NOTE:
• If DTC P1650 is displayed with DTC U1001, perform the trouble diagnosis for DTC U1001. Refer to 

EC-168,

"DTC Logic"

.

• If DTC P1650 is displayed with DTC P0607, perform the trouble diagnosis for DTC P0607. Refer to 

EC-335,

"DTC Logic"

.

• If DTC P1650 is displayed with B209F or B20A0 of IPDM E/R, perform the trouble diagnosis for B209F or

B20A0. Refer to 

SEC-104, "DTC Logic"

 or 

SEC-106, "DTC Logic"

.

• If DTC P1650 is displayed with B26F9 or B26FA of BCM, perform the trouble diagnosis for B209F or B20A0.

Refer to 

SEC-104, "DTC Logic"

 or 

SEC-106, "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 A AND C

1.

Turn ignition switch OFF and wait at least 10 seconds.

2.

Turn ignition switch ON.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1650

STR MTR RELAY 2
(Starter relay circuit)

A

Starter relay is stuck ON.

• Harness and connectors

(Between IPDM E/R harness connector and ECM 
harness connector is shorted to ground.)
(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 ECM 
harness is open or shorted to power.)
(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

P1650 STARTER MOTOR RELAY 2

EC-375

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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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-375, "Diagnosis Procedure"

.

NO

>> GO TO 3.

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.

Shift the selector lever to D position while depressing fully the brake pedal.

9.

Remove vacuum hoses from intake manifold. Refer to 

EM-28, "Exploded View"

.

10. Check 1st trip DTC.

Is 1st trip DTC detected?

YES

>> Proceed to 

EC-375, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009651225

1.

CHECK STARTER RELAY POWER SUPPLY CIRCUIT

Check the starter motor relay power supply circuit. Refer to 

PCS-35, "Diagnosis Procedure"

.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK STARTER RELAY CONTROL SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect IPDM E/R harness connector.

3.

Disconnect BCM harness connector.

4.

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

+

−

Continuity

IPDM E/R

BCM

Connector

Terminal

Connector

Terminal

E13

30

M69

64

Existed

EC-376

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1650 STARTER MOTOR RELAY 2

Refer to 

SEC-40, "Wiring Diagram"

.

5.

Also check harness for short to ground to power.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK INTERMITTENT INCIDENT

Perform 

GI-42, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> Replace IPDM E/R. Refer to 

PCS-36, "Removal and Installation"

.

NO

>> Repair or replace error-detected parts.

P1651 STARTER MOTOR RELAY

EC-377

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

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P1651 STARTER MOTOR RELAY

Description

INFOID:0000000009651226

ECM controls ON/OFF state of the starter relay, according to the engine and vehicle condition. Models with no
Intelligent Key System transmit a control signal directly to IPDM E/R. On the other hand, models with the Intel-
ligent Key System transmit a control signal to IPDM E/R by way of BCM via CAN communication.
Under normal conditions, ECM controls and maintains the starter relay in OFF state during engine running or
“D” position. 
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:0000000009651227

DTC DETECTION LOGIC

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

EC-168,

"DTC Logic"

.

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

EC-336,

"DTC Logic"

.

• If DTC P1651 is displayed with B209F or B20A0 of IPDM E/R, perform the trouble diagnosis for B209F or

B20A0. Refer to 

SEC-104, "DTC Logic"

 or 

SEC-106, "DTC Logic"

.

• If DTC P1651 is displayed with B26F9 or B26FA of BCM, perform the trouble diagnosis for B209F or B20A0.

Refer to 

SEC-104, "DTC Logic"

 or 

SEC-106, "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-377, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009651228

1.

INSPECTION START

Check the starter motor operation.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

P1651

STR MTR RELAY
(Starter control relay circuit)

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

• Harness or connectors

(Between ECM harness connector and IPDM 
E/R harness connector is shorted to power.)
(Between ECM harness connector and BCM 
harness connector is shorted to power.)

• IPDM  E/R
• BCM