Nissan Quest E52. Manual - part 542

EC-378

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1651 STARTER MOTOR RELAY

Is the starter motor operated?

YES

>> GO TO 3.

NO

>> GO TO 2.

2.

CHECK DTC WITH IPDM E/R

Check DTC with IPDM E/R. Refer to 

PCS-13, "CONSULT Function (IPDM E/R)"

.

Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Perform trouble diagnosis for DTC indicated.

3.

CHECK DTC WITH BCM

Check DTC with BCM. Refer to 

BCS-34, "BCM : CONSULT Function (BCM - BCM)"

.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Perform trouble diagnosis for DTC indicated.

4.

CHECK CRANKING REQUEST SIGNAL CIRCUIT-I

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 5.

NO

>> Repair or replace error-detected parts.

5.

CHECK CRANKING REQUEST SIGNAL CIRCUIT-II

1.

Disconnect BCM harness connector.

2.

Check the continuity between ECM harness connector and BCM harness connector.

Refer to 

SEC-40, "Wiring Diagram"

.

3.

Also check harness for short to ground to power.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> Repair or replace error-detected parts.

6.

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.

+

−

Continuity

ECM

IPDM E/R

Connector

Terminal

Connector

Terminal

F7

8

F12

71

Existed

+

−

Continuity

ECM

BCM

Connector

Terminal

Connector

Terminal

F7

8

M69

64

Existed

P1652 STARTER MOTOR SYSTEM COMM

EC-379

< DTC/CIRCUIT DIAGNOSIS >

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P1652 STARTER MOTOR SYSTEM COMM

Description

INFOID:0000000009651229

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:0000000009651230

DTC DETECTION LOGIC

NOTE:
• If DTC P1652 is displayed with DTC U1001, perform the trouble diagnosis for DTC U1001. Refer to 

EC-168,

"DTC Logic"

.

• If DTC P1652 is displayed with DTC P0607, perform the trouble diagnosis for DTC P0607. Refer to 

EC-336,

"DTC Logic"

.

• If DTC P1652 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 P1652 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.

Turn ignition switch ON and wait at least 5 minutes.

3.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

EC-379, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000009651231

1.

INSPECTION START

1.

Erase DTC.

2.

Perform DTC confirmation procedure. Refer to 

EC-379, "DTC Logic"

.

3.

Check DTC.

Is the P1652 displayed again?

YES

>> GO TO 2.

DTC No.

Trouble diagnosis name

(Trouble diagnosis content)

DTC detecting condition

P1652

STR MTR SYS COMM
(Starter motor communication line)

ECM detects malfunction in starter motor drive circuit of the IPDM E/R.

IPDM E/R

EC-380

< DTC/CIRCUIT DIAGNOSIS >

[VQ35DE]

P1652 STARTER MOTOR SYSTEM COMM

NO

>> INSPECTION END

2.

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"

.

NG 

>> Repair or replace error-detected parts.

P1700 CVT CONTROL SYSTEM

EC-381

< DTC/CIRCUIT DIAGNOSIS >

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P1700 CVT CONTROL SYSTEM

Description

INFOID:0000000009651232

This DTC is displayed with other DTC regarding TCM. Perform the trouble diagnosis for corresponding DTC.
Refer to 

EC-96, "DTC Index"

. When this DTC is detected, the ASCD control is canceled.