Nissan Frontier D40. Manual - part 400

P0850 PNP SWITCH

EC-291

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3.

CHECK PNP SWITCH INPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Disconnect ECM harness connector.

2.

Check harness continuity between ECM terminal 102 and PNP switch terminal 1.
Refer to Wiring Diagram.

3.

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

OK or NG

OK

>> GO TO 5.

NG

>> GO TO 4.

4.

DETECT MALFUNCTIONING PART

Check the following.
• Harness connectors F14, E5
• Harness for open or short between PNP switch and ECM

>> Repair open circuit, short to ground or short to power in harness or connectors.

5.

CHECK PNP SWITCH

Refer to 

EC-406, "Wiring Diagram"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace PNP switch.

6.

CHECK INTERMITTENT INCIDENT

Refer to

GI-46, "Intermittent Incident"

 .

>> INSPECTION END

Continuity should exist.

EC-292

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P1148 CLOSED LOOP CONTROL

P1148 CLOSED LOOP CONTROL

On Board Diagnosis Logic

INFOID:0000000005273307

This self-diagnosis has the one trip detection logic.

NOTE:
DTC P1148 is displayed with another DTC for air fuel ratio (A/F) sensor 1. 
Perform the trouble diagnosis for the corresponding DTC.

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1148
1148

Closed loop control function

The closed loop control function does not 
operate even when vehicle is being driven in 
the specified condition.

• Harness or connectors

[The air fuel ratio (A/F) sensor 1 circuit is 
open or shorted.]

• Air fuel ratio (A/F) sensor 1
• Air fuel ratio (A/F) sensor 1 heater

P1217 ENGINE OVER TEMPERATURE

EC-293

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P1217 ENGINE OVER TEMPERATURE

On Board Diagnosis Logic

INFOID:0000000005273308

If the cooling fan or another component in the cooling system malfunctions, engine coolant temperature will
rise.
When the engine coolant temperature reaches an abnormally high temperature condition, a malfunction is
indicated.
This self-diagnosis has the one trip detection logic.

CAUTION:

When a malfunction is indicated, always replace the coolant. Refer to 

CO-12, "Changing Engine Cool-

ant"

, “Changing Engine Coolant”. Also, replace the engine oil. 

1.

Fill radiator with coolant up to specified level with a filling speed of 2 liters per minute. Always use
coolant with the proper mixture ratio. Refer to 

MA-16, "For North America: Fluids and Lubricants"

.

2.

After refilling coolant, run engine to ensure that no water-flow noise is emitted.

Overall Function Check

INFOID:0000000005273309

Use this procedure to check the overall function of the engine coolant over temperature enrichment protection
check, a DTC might not be confirmed.

WARNING:

Never remove the radiator cap when the engine is hot. Serious burns could be caused by high pres-
sure fluid escaping from the radiator.
Wrap a thick cloth around cap. Carefully remove the cap by turning it a quarter turn to allow built-up
pressure to escape. Then turn the cap all the way off.

 WITH CONSULT-III

1.

Check the coolant level in the reservoir tank and radiator.
NOTE:
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below
the proper range, skip the following steps and go to 

EC-294,

"Diagnosis Procedure"

 .

2.

Confirm whether customer filled the coolant or not. If customer
filled the coolant, skip the following steps and go to 

EC-294,

"Diagnosis Procedure"

 .

3.

Start engine.

4.

Make sure that cooling fan (crankshaft driven) operates.

5.

If NG, go to 

EC-294, "Diagnosis Procedure"

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 WITH GST

1.

Check the coolant level in the reservoir tank and radiator.
NOTE:
Allow engine to cool before checking coolant level.
If the coolant level in the reservoir tank and/or radiator is below the proper range, skip the following steps
and go to 

EC-294, "Diagnosis Procedure"

 .

2.

Confirm whether customer filled the coolant or not. If customer filled the coolant, skip the following steps
and go to 

EC-294, "Diagnosis Procedure"

 .

3.

Start engine and make sure that cooling fan (crankshaft driven) operates.

CAUTION:

DTC No.

Trouble diagnosis name

DTC detecting condition

Possible cause

P1217

Engine over temperature 
(Overheat)

• Cooling fan does not operate properly 

(Overheat).

• Cooling fan system does not operate 

properly (Overheat).

• Engine coolant was not added to the sys-

tem using the proper filling method.

• Engine coolant is not within the specified 

range.

• Cooling fan (crankshaft driven)
• Radiator hose
• Radiator
• Radiator  cap
• Water pump
• Thermostat
• Engine coolant temperature sensor
For more information, refer to 

EC-295, "Main 

12 Causes of Overheating"

 .

SEF621W

EC-294

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P1217 ENGINE OVER TEMPERATURE

Be careful not to overheat engine.

4.

If NG, go to 

EC-294, "Diagnosis Procedure"

 .

Diagnosis Procedure

INFOID:0000000005273310

1.

CHECK COOLING FAN (CRANKSHAFT DRIVEN) OPERATION

1.

Start engine and let it idle.

2.

Make sure that cooling fan (crankshaft driven) operates normally.

OK or NG

OK

>> GO TO 2.

NG

>> Check cooling fan (crankshaft driven). Refer to 

CO-19, "Exploded View"

.

2.

CHECK COOLING SYSTEM FOR LEAK

Refer to 

CO-11, "System Inspection"

.

OK or NG

OK

>> GO TO 3.

NG

>>

Check the following for leak. 

• Hose
• Radiator
• Water pump
• Reservoir tank

3.

CHECK RADIATOR CAP

Refer to 

CO-16, "Exploded View"

.

OK or NG

OK

>> GO TO 4.

NG

>> Replace radiator cap.

4.

CHECK THERMOSTAT

Refer to 

CO-22, "Exploded View"

.

OK or NG

OK

>> GO TO 5.

NG

>> Replace thermostat.

5.

CHECK ENGINE COOLANT TEMPERATURE SENSOR

Refer to 

EC-125, "Component Inspection"

.

OK or NG

OK

>> GO TO 6.

NG

>> Replace engine coolant temperature sensor.

6.

CHECK MAIN 12 CAUSES

If the cause cannot be isolated, go to 

EC-295, "Main 12 Causes of Overheating"

 .

>> INSPECTION END