Nissan Qashqai J11. Manual - part 221

ECH-182

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

P0141 HO2S2 HEATER

YES

>> GO TO 5.

NO

>> Repair or replace ground connection.

5.

CHECK HO2S2 POWER SUPPLY CIRCUIT

1.

Reconnect 15 A fuse (No. 55) from IPDM E/R.

2.

Disconnect heated oxygen sensor 2 harness connector.

3.

Turn ignition switch ON.

4.

Check the voltage between HO2S2 harness connector and ground.

Is the inspection result normal?

YES

>> GO TO 6.

NO

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

6.

CHECK HO2S2 OUTPUT SIGNAL CIRCUIT FOR OPEN AND SHORT

1.

Turn ignition switch OFF.

2.

Disconnect ECM harness connector.

3.

Check the continuity between HO2S2 harness connector and ECM harness connector.

4.

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

Is the inspection result normal?

YES

>> GO TO 7.

NO

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

7.

CHECK INTERMITTENT INCIDENT

Refer to 

GI-41, "Intermittent Incident"

.

Is the inspection result normal?

YES

>> GO TO 8.

NO

>> Repair or replace error-detected parts.

8.

REPLACE HEATED OXYGEN SENSOR 2

Replace heated oxygen sensor 2.

CAUTION:

• Discard any heated oxygen sensor which has been dropped from a height of more than 0.5 m (19.7

in) onto a hard surface such as a concrete floor; use a new one.

>> INSPECTION END

HO2S2

Ground

Voltage

Connector

Terminal

F10

4

Ground

Battery voltage

HO2S2

ECM

Continuity

Connector

Terminal

Connector

Terminal

F10

3

F17

92

Existed

P0170 FUEL INJECTION SYSTEM FUNCTION

ECH-183

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

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P0170 FUEL INJECTION SYSTEM FUNCTION

DTC Logic

INFOID:0000000010500212

DTC DETECTION LOGIC

With the Air/Fuel Mixture Ratio Self-Learning Control, the actual mixture ratio can be brought closely to the
theoretical mixture ratio based on the mixture ratio feedback signal from the heated oxygen sensor 1. The
ECM calculates the necessary compensation to correct the offset between the actual and the theoretical
ratios.
In case the amount of the compensation value is extremely large (The actual mixture ratio is too lean.), the
ECM judges the condition as the fuel injection system malfunction and lights up the MIL (2 trip detection logic).

NOTE:
If DTC P0170 is display with DTC P025A or P0627, first perform the trouble diagnosis for DTC P025A or
P0627. Refer to 

ECH-71, "DTC Index"

.

DTC CONFIRMATION PROCEDURE

1.

PRECONDITIONING

If DTC Confirmation Procedure has been previously conducted, always turn ignition switch OFF and wait at
least 12 minutes before conducting the next test. 
TESTING CONDITION:
Before performing the following procedure, confirm that battery voltage is between 10 V and 16 V at
idle.

>> GO TO 2.

2.

PERFORM DTC CONFIRMATION PROCEDURE-I

1.

Start engine and warm it up to the normal operating temperature.

2.

Keep the engine speed at 2,500 rpm for at least 10 seconds.

Is 1st trip DTC detected?

YES

>> Proceed to 

ECH-183, "Diagnosis Procedure"

NO

>> INSPECTION END

Diagnosis Procedure

INFOID:0000000010500213

1.

CHECK FUEL LEAKAGE

1.

Start the engine.

2.

Visually check that the fuel pump, fuel rail, and fuel piping have no fuel leakage.

Is the inspection result normal?

YES

>> GO TO 2.

NO

>> Repair or Replace the error-detected parts.

2.

CHECK FUEL PRESSURE

Check fuel pressure. Refer to 

ECH-121, "Work Procedure"

.

Is the inspection result normal?

YES

>> GO TO 3.

Sensor

Input signal to ECM

ECM function

Actuator

Heated oxygen sensor 1

Density of oxygen in exhaust gas
(Mixture ratio feedback signal)

Fuel injection control

Fuel injector

DTC No.

CONSULT screen terms

(Trouble diagnosis con-

tent)

DTC detecting condition

Possible cause

P0170

FUEL TRIM B1
(Fuel trim bank 1)

• Fuel injection system does not operate properly.
• The amount of mixture ratio compensation is too 

large. (The mixture ratio is too lean.)

• Heated oxygen sensor 1
• Fuel injector
• Fuel system

ECH-184

< DTC/CIRCUIT DIAGNOSIS >

[HRA2DDT]

P0170 FUEL INJECTION SYSTEM FUNCTION

NO

>> Repair or Replace the error-detected parts.

3.

CHECK HEATED OXYGEN SENSOR 1 INPUT SIGNAL CIRCUIT

1.

Turn ignition switch OFF.

2.

Disconnect corresponding heated oxygen sensor 1 harness connector.

3.

Disconnect ECM harness connector.

4.

Check the continuity between heated oxygen sensor 1 harness connector and ECM harness connector.

5.

Check the continuity between heated oxygen sensor 1 harness connector and ground, or ECM harness
connector and ground.

6.

Also check harness for short to power.

Is the inspection result normal?

YES

>> GO TO 4.

NO

>> Repair or replace error-detected parts.

4.

CHECK FUNCTION OF FUEL INJECTOR

1.

Let engine idle.

2.

Listen to each fuel injector operating sound.

Is the inspection result normal?

YES

>> GO TO 5.

NO

>> Perform trouble diagnosis for “FUEL INJECTOR”.

5.

CHECK FUEL INJECTOR

1.

Turn ignition switch OFF.

2.

Confirm that the engine is cooled down and there are no fire hazards near the vehicle.

3.

Disconnect all fuel injector harness connectors.

4.

Remove fuel tube assembly.
Keep fuel hose and all fuel injectors connected to fuel tube.

5.

Disconnect all ignition coil harness connectors.

6.

Prepare pans or saucers under each fuel injector.

+

−

Continuity

Heated oxygen sensor 1

ECM

Connector

Terminal

Connector

Terminal

F48

2

F18

99

Existed

+

−

Continuity

Heated oxygen sensor 1

Connector

Terminal

F48

2

Ground

Not existed

+

−

Continuity

ECM

Connector

Terminal

F18

99

Ground

Not existed

Clicking noise should be heard.

PBIB3332E

P0170 FUEL INJECTION SYSTEM FUNCTION

ECH-185

< DTC/CIRCUIT DIAGNOSIS >

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7.

Crank engine for about 3 seconds.

Is the inspection result normal?

YES

>> Check intermittent incident. Refer to 

GI-41, "Intermittent

Incident"

.

NO

>> Replace fuel injectors from which fuel does not spray

out. Always replace O-ring with new ones.

Fuel should be sprayed evenly for each fuel injector.

PBIA9666J