Nissan Qashqai J11. Manual - part 445

ECK-340

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

P1642 THERMOPLUNGER CONTROL UNIT

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Perform trouble diagnosis for battery power supply circuit.

4.

CHECK THERMOPLUNGER CONTROL UNIT REFERENCE VALUE-1

Check the thermoplunger control unit reference value (thermoplunger control unit side). Refer to 

ECK-76,

"Reference Value"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK THERMOPLUNGER CONTROL UNIT CIRCUIT-1

Check the thermoplunger control unit circuit for open and short.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

6.

CHECK THERMOPLUNGER CONTROL UNIT REFERENCE VALUE-2

Check the thermoplunger control unit reference value (ECM side). Refer to 

ECK-76, "Reference Value"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

CHECK THERMOPLUNGER CONTROL UNIT CIRCUIT-2

Check the thermoplunger control unit circuit for open and short.

Is the inspection result normal?

YES

>> Replace thermoplunger control unit.

NO

>> Repair or replace error-detected parts.

8.

CHECK THERMOPLUNGER

Check thermoplunger. Refer to 

ECK-344, "Component Inspection (Thermoplunger)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Replace malfunctioning thermoplunger.

+

-

Continuity

ECM

Thermoplunger control unit

Connector

Terminal

Connector

Terminal

F80

39

F71

8

Existed

44

1

63

2

F81

111

3

121

7

+

-

Continuity

ECM

Thermoplunger control unit

Connector

Terminal

Connector

Terminal

F80

39

F71

8

Existed

44

1

63

2

F81

111

3

121

7

P1642 THERMOPLUNGER CONTROL UNIT

ECK-341

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

C

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ECK

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Component Inspection (Thermoplunger)

INFOID:0000000010514975

1.

CHECK THERMOPLUNGER

1.

Turn ignition switch OFF.

2.

Disconnect thermoplunger harness connector.

3.

Check the resistance between thermoplunger terminal and ground.

is the inspection result normal?

YES

>> INSPECTION END

NO

>> Replace thermoplunger.

+

-

Resistance

Thermoplunger

Terminal

1

Ground

608 

±

 61 m

Ω

ECK-342

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

P1643 THERMOPLUNGER CONTROL UNIT

P1643 THERMOPLUNGER CONTROL UNIT

DTC Logic

INFOID:0000000010289995

DTC DETECTION LOGIC

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 1 minute before conducting the next test.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE

1.

Turn ignition switch ON at least 1 second.

2.

Check DTC.

Is DTC detected?

YES

>> Proceed to 

ECK-342, "Diagnosis Procedure"

.

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010514976

1.

CHECK ECM HARNESS CONNECTOR CONNECTION

1.

Turn ignition switch OFF. 

2.

Check the ECM harness connector connection. 

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or replace error-detected parts.

2.

CHECK THERMOPLUNGER CONTROL UNIT HARNESS CONNECTOR CONNECTION

Check the thermoplunger control unit harness connector connection. 
Is the inspection result normal?

YES

>> GO TO 3.

NO

>> Repair or replace error-detected parts.

3.

CHECK THERMOPLUNGER CONTROL UNIT POWER SUPPLY

Check the thermoplunger control unit power supply.

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detecting condition

Possible cause

P1643

THMPR 3 RLY C/CIR
(Thermoplunger 3 relay control 
circuit)
• 1.DEF: IMPLAUSIBLE SIG-

NAL

• CC.0: SHORT CIRCUIT TO 

EARTH

• CC.1: SHORT-CIRCUIT TO 

+12V

• CO: OPEN CIRCUIT

• ECM detects thermoplunger control unit cir-

cuit is open circuit.

• ECM detects thermoplunger control unit cir-

cuit is short circuit to ground.

• ECM detects thermoplunger control unit cir-

cuit is short circuit to battery.

• Harness or connectors

(Thermoplunger control unit circuit 
is open or shorted.)

• Thermoplunger control unit

+

-

Voltage

Thermoplunger control unit

Connector

Terminal

F71

4

Ground

Battery voltage

5

P1643 THERMOPLUNGER CONTROL UNIT

ECK-343

< DTC/CIRCUIT DIAGNOSIS >

[K9K]

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ECK

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Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Perform trouble diagnosis for battery power supply circuit.

4.

CHECK THERMOPLUNGER CONTROL UNIT REFERENCE VALUE-1

Check the thermoplunger control unit reference value (thermoplunger control unit side). Refer to 

ECK-76,

"Reference Value"

.

Is the inspection result normal?

YES

>> GO TO 6.

NO

>> GO TO 5.

5.

CHECK THERMOPLUNGER CONTROL UNIT CIRCUIT-1

Check the thermoplunger control unit circuit for open and short.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Repair or replace error-detected parts.

6.

CHECK THERMOPLUNGER CONTROL UNIT REFERENCE VALUE-2

Check the thermoplunger control unit reference value (ECM side). Refer to 

ECK-76, "Reference Value"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> GO TO 7.

7.

CHECK THERMOPLUNGER CONTROL UNIT CIRCUIT-2

Check the thermoplunger control unit circuit for open and short.

Is the inspection result normal?

YES

>> Replace thermoplunger control unit.

NO

>> Repair or replace error-detected parts.

8.

CHECK THERMOPLUNGER

Check thermoplunger. Refer to 

ECK-344, "Component Inspection (Thermoplunger)"

.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent Incident"

.

NO

>> Replace malfunctioning thermoplunger.

+

-

Continuity

ECM

Thermoplunger control unit

Connector

Terminal

Connector

Terminal

F80

39

F71

8

Existed

44

1

63

2

F81

111

3

121

7

+

-

Continuity

ECM

Thermoplunger control unit

Connector

Terminal

Connector

Terminal

F80

39

F71

8

Existed

44

1

63

2

F81

111

3

121

7