NR Series ENGINE CONTROL  SFI SYSTEM  Lack of Power  

Interview the customer for details about the conditions when experiencing the lack of power.

HINT:

If a lack of power occurs when the engine is running under a high load and at a high engine speed, the fuel filter may be clogged.

Result:

Result	Proceed to
Other than below	A
Lack of power during high-load driving	B

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Perform a road test.

Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

50001 372

Result:

Result	Proceed to
DTCs are not output	A
DTC is output (DTCs other than P160300, P160400 or P160500 are output)	B

Check if the problem symptoms reported in the customer problem analysis recur.

HINT:

If the problem symptoms do not recur, attempt to reproduce the conditions when the malfunction occurred based on the result of the customer problem analysis.

Result:

Result	Proceed to
The problem symptom recurs	A
The problem symptom does not recur (occurred in the past)	B

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / ISC F/B Learn Torque.

Powertrain > Engine > Data List

Tester Display
ISC F/B Learn Torque

50003 372 114

Read the value displayed on the GTS.

Result:

Result	Proceed to
Less than 15 Nm	A
Other than above	B

Connect the GTS to the DLC3.

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

Turn the GTS on.

Idle the engine.

Enter the following menus: Powertrain / Engine / Data List / Knock Correct Learn Value.

Powertrain > Engine > Data List

Tester Display
Knock Correct Learn Value

50003 372 95

Read the value.

Result:

Knock Correct Learn Value	Proceed to
5 deg(CA) or higher	A
Less than 5 deg(CA)	B

HINT:

·

If the value shown in the Data List is below 5 deg(CA), interview the customer to check if the malfunction is caused by the quality of the fuel being used.

·

If the result of the customer problem analysis is that improper fuel was not used or the type of fuel used is unknown, suggest that the customer refuel the vehicle with a different brand of fuel and then check if the malfunction symptoms disappear.

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Short FT B1S1 and Long FT B1S1.

Powertrain > Engine > Data List

Tester Display
Short FT B1S1
Long FT B1S1

50003 372 207,209

Read the value displayed on the GTS.

Result:

Data List	Result	Proceed to
Short FT B1S1 + Long FT B1S1	-15% or higher, or less than 15%	A
	Other than above	B

HINT:

·

"Total FT Bank 1" is used to detect an abnormal air fuel ratio. As the value of "Total FT Bank 1" is corrected by the ECM before it is displayed in the Data List, the displayed value may not be equal to the sum of the measured "Short FT B1S1" and "Long FT B1S1".

·

An abnormally lean or rich tendency can be checked by reading the following Data List items: A/F Learn Value Idle Bank 1, A/F Learn Value Low Bank 1, A/F Learn Value Mid No.1 Bank 1, A/F Learn Value Mid No.2 Bank 1 and A/F Learn Value High Bank 1.

·

The following may cause a lean air fuel ratio (an operating range in which the air fuel ratio learned value correction is +15% or more):

(a)

Decrease in fuel injector assembly injection volume

(b)

Decrease in mass air flow meter sub-assembly output (due to existence of foreign matter)

(c)

Air leaks in intake system after mass air flow meter sub-assembly

(d)

Decrease in fuel pressure (at fuel filter, fuel pump or fuel pressure regulator)

·

On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value High Bank 1" only is corrected to the positive side, a malfunction in the fuel system (clogging of the fuel pump or fuel filter) is suspected.

·

On vehicles which the learning value for each operating range can be checked, if the value of "A/F Learn Value Idle Bank 1" or "A/F Learn Value Low Bank 1" only is corrected to the positive side, an air leak after the mass air flow meter sub-assembly is suspected.

·

The following may cause a rich air fuel ratio (an operating range in which the air fuel ratio learned value correction is -15% or less):

(a)

Increase in the fuel injector assembly injection volume

(b)

Purge VSV system

Connect the GTS to the DLC3.

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Boost Pressure Sensor.

Powertrain > Engine > Data List

Tester Display
Boost Pressure Sensor

50003 372 269

Accelerate to 80 km/h (50 mph) with the accelerator pedal fully depressed.

NOTICE:

When performing the confirmation driving pattern, obey all speed limits and traffic laws.

HINT:

Perform the test drive at 500 m (1640 ft.) or lower elevation. Accurate evaluation may not be possible at high elevation.

Read the Data List while driving with the shift lever in 2nd and an engine speed of 4000 rpm (40 to 65 km/h (25 to 40 mph)).

Result:

GTS Display	Result	Proceed to
Boost Pressure Sensor	150 kPa (22 psi) or higher	A
	Below 150 kPa (22 psi)	B

Connect the GTS to the DLC3.

Start the engine.

HINT:

Reproduce the vehicle conditions when the malfunction occurred. (such as after the engine is warmed up or after a cold start).

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Active Test / Control the Select Cylinder Fuel Cut / Data List / Engine Speed.

Powertrain > Engine > Active Test

Active Test Display
Control the Select Cylinder Fuel Cut

Data List Display
Engine Speed

50004 372 42005 211

According to the display on the GTS, perform the Active Test and check for a malfunctioning cylinder.

HINT:

·

Perform fuel-cut for each cylinder and check the change in the engine speed.

·

If the engine speed of a cylinder does not change while performing the Active Test, it can be determined that the cylinder is malfunctioning.

·

If the engine speed of all cylinders change while performing the Active Test, it can be determined that multiple cylinders are malfunctioning.

·

A cylinder for which the Data List item "Misfire Count Cylinder #1 to #4" increases may be malfunctioning.

Result:

Result	Proceed to
One cylinder is malfunctioning	A
Multiple or all cylinders are malfunctioning, or the malfunctioning cylinder cannot be determined.	B

Warm up the engine.

Turn the ignition switch off.

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Active Test / Check the Cylinder Compression / Data List / Compression / Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder.

Powertrain > Engine > Active Test

Active Test Display
Check the Cylinder Compression

Data List Display
Engine Speed Cylinder #1
Engine Speed Cylinder #2
Engine Speed Cylinder #3
Engine Speed Cylinder #4
Average Engine Speed of All Cylinder

50004 372 42007 134,135,136,137,133

HINT:

To display the entire Data List, press the pull down menu button next to Primary. Then select Compression.

While the engine is not running, press the button to change Check the Cylinder Compression to "Start".

HINT:

After performing the above procedure, the Active Test will start. Fuel injection for all cylinders is prohibited and engine speed measurement enters standby mode.

Crank the engine for about 10 seconds.

HINT:

Continue to crank the engine until the values change from the default value (51199 rpm).

Monitor the engine speed (Engine Speed Cylinder #1 to #4 and Average Engine Speed of All Cylinder) displayed on the GTS.

NOTICE:

·

In order to protect the starter assembly, do not crank the engine continuously for 20 seconds or more.

·

If it is necessary to crank the engine again after Check the Cylinder Compression has been changed to "Start" and the engine has been cranked once, press Exit to return to the Active Test menu screen. Then change Check the Cylinder Compression to "Start" and crank the engine.

·

Make sure the battery is fully charged before performing this Active Test.

HINT:

·

At first, the GTS will display extremely high cylinder engine speed values. After approximately 10 seconds of engine cranking, the engine speed measurement of each cylinder will change to the actual engine speed.

·

If the cylinder engine speed values (Engine Speed Cylinder #1 to #4) displayed in the Data List do not change from an extremely high value, return to the Active Test menu screen, change "Check the Cylinder Compression" to "Start" and crank the engine again within 1 second.

Stop cranking the engine, and then change "Check the Cylinder Compression" to "Stop" after the engine stops.

NOTICE:

·

If the Active Test is changed to "Stop" while the engine is being cranked, the engine will start.

·

When performing the Active Test, DTC P160400 (Startability Malfunction) may be stored.

·

After performing the Active Test, make sure to check and clear DTCs.

Read the value.

HINT:

·

If the value of Data List item "Engine Speed Cylinder" of a cylinder is higher than other cylinders, the cylinder may be malfunctioning.

·

If the value of Data List item "Engine Speed Cylinder" is high for only one cylinder, compression loss is suspected.

Result:

Result	Proceed to
There is no variation in "Engine Speed Cylinder" (All cylinders display approximately the same value for "Engine Speed Cylinder")	A
There is variation in "Engine Speed Cylinder" (Only one cylinder displays a value for "Engine Speed Cylinder" that differs considerably)	B

Connect the GTS to the DLC3.

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

Turn the GTS on.

Idle the engine.

Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume.

Powertrain > Engine > Active Test

Tester Display
Control the Injection Volume

50004 372 7

According to the display on the GTS, perform the Active Test and check the vehicle conditions when increasing and decreasing the fuel injection volume.

HINT:

Change the fuel injection volume between the minimum and maximum range of correction (e.g. -12.5% to 12.5%).

Result:

Result	Proceed to
Malfunction is still present even if the fuel injection volume is changed	A
Malfunction disappears when the fuel injection volume is changed	B

Check the ignition system.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>IGNITION SYSTEM>ON-VEHICLE INSPECTION201906,999999,_51,_080777,_0392332,RM100000001HQ1A,

HINT:

·

Interchange the ignition coil assembly and spark plug of the malfunctioning cylinder with those of a known good cylinder and check if the malfunctioning cylinder returns to normal.

·

If the spark plug of the malfunctioning cylinder is abnormally wet with fuel even after the ignition coil assembly and spark plug are replaced, a leaking fuel injector assembly is suspected.

Result:

Result	Proceed to
The malfunctioning cylinder does not return to normal	A
The malfunctioning cylinder returned to normal	B

Check the power source circuit, wire harness and connectors.

Clean off any deposits from the inside of the throttle body with motor assembly.

Perform "Inspection After Repair" after cleaning the throttle body with motor assembly.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION201906,999999,_51,_080777,_0393969,RM100000001I1RE,

Connect the GTS to the DLC3.

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

Turn the GTS on.

Allow the engine to idle for 3 minutes or more and confirm that the engine speed is within the specified range.

HINT:

If the engine is operated without performing learning value reset and idle learning after cleaning the deposits from the throttle body with motor assembly, the idle speed may increase.

Perform a lack of power (turbocharger system) troubleshooting inspection.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>Lack of Power (Turbocharger System)201906,999999,_51,_080777,_0393969,RM100000001I1RR,

Measure the cylinder compression pressure. If the compression pressure of a cylinder is low, inspect the engine assembly and repair or replace parts as necessary.

Click hereEngine / Hybrid System>NR Series (ENGINE MECHANICAL)>ENGINE>ON-VEHICLE INSPECTION201906,999999,_51,_080739,_0391929,RM100000001HN1S_01_0010,

Replace the abnormal fuel injector assembly.

Click hereEngine / Hybrid System>NR Series (FUEL)>FUEL INJECTOR>REMOVAL201906,202205,_51,_080750,_0393846,RM100000001I0DX,202205,202304,_51,_080750,_0393846,RM10000000231S4,202304,999999,_51,_080750,_0393846,RM100000002BCBA,

HINT:

·

If the air fuel ratio learned value is corrected to the positive side for all operating ranges due to low fuel injector assembly injection volume, replace the fuel injector assemblies of all cylinders.

·

Perform "Inspection After Repair" after replacing the fuel injector assembly.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION201906,999999,_51,_080777,_0393969,RM100000001I1RE,

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Perform the DTC P024313 confirmation driving pattern.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P024313201906,202007,_51,_080777,_0393969,RM100000001I1TV_07,P024313202007,999999,_51,_080777,_0393969,RM100000001RKL4,P024313

Enter the following menus: Powertrain / Engine / Trouble Codes.

Read the DTCs.

Powertrain > Engine > Trouble Codes

50001 372

Result:

Result	Proceed to
DTCs are not output	A
DTC is output (DTCs other than P160300, P160400 or P160500 are output)	B

Inspect the waste gate valve.

Click hereEngine / Hybrid System>NR Series (INTAKE / EXHAUST)>TURBOCHARGER>INSPECTION201906,999999,_51,_080791,_0392518,RM100000001HRDG_01_0001,

Inspect the waste gate valve actuator.

Click hereEngine / Hybrid System>NR Series (INTAKE / EXHAUST)>TURBOCHARGER>INSPECTION201906,999999,_51,_080791,_0392518,RM100000001HRDG_01_0006,

Inspect the vacuum regulating valve assembly.

Click hereEngine / Hybrid System>NR Series (EMISSION CONTROL)>VACUUM REGULATING VALVE>INSPECTION201906,999999,_51,_080792,_0392499,RM100000001HRBT,

Disconnect the vacuum regulating valve assembly connector.

Disconnect the ECM connector.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection	Condition	Specified Condition
C98-1 (+) - C78-37 (WGV+)	Always	Below 1 Ω
C98-2 (-) - C78-36 (WGV-)	Always	Below 1 Ω
C98-1 (+) or C78-37 (WGV+) - Body ground and other terminals	Always	10 kΩ or higher
C98-2 (-) or C78-36 (WGV-) - Body ground and other terminals	Always	10 kΩ or higher

Connect the GTS to the DLC3.

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Mass Air Flow Sensor.

Powertrain > Engine > Data List

Tester Display
Mass Air Flow Sensor

50003 372 215

According to the display on the GTS, read the Data List when the ignition switch is turned to ON and while maintaining an engine speed of 3000 rpm.

Result:

Result	Proceed to
· Idling (warmed up engine, without load): 1.0 to 3.0 gm/sec · Engine speed 3000 rpm (warmed up engine, without load): 4.0 to 14 gm/sec	A
Other than above	B

Connect the GTS to the DLC3.

Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher.

Turn the GTS on.

Warm up the air fuel ratio sensors at an engine speed of 2500 rpm for 90 seconds.

Enter the following menus: Powertrain / Engine / Active Test / Control the Injection Volume for A/F Sensor / Data List / Coolant Temperature, A/F (O2) Sensor Voltage B1S1 and A/F (O2) Sensor Current B1S2.

Powertrain > Engine > Active Test

Active Test Display
Control the Injection Volume for A/F Sensor

Data List Display
Coolant Temperature
A/F (O2) Sensor Voltage B1S1
A/F (O2) Sensor Current B1S2

50004 372 8 205,225,564

Perform the Control the Injection Volume for A/F Sensor operation with the engine idling (change the fuel injection volume).

Monitor the output values of the air fuel ratio sensors (A/F (O2) Sensor Voltage B1S1 and A/F (O2) Sensor Current B1S2) displayed on the GTS.

HINT:

·

The Control the Injection Volume for A/F Sensor operation lowers the fuel injection volume by 12.5% or increases the injection volume by 12.5%.

·

The air fuel ratio sensor (sensor 1) has an output delay of a few seconds and the air fuel ratio sensor (sensor 2) has a maximum output delay of approximately 20 seconds.

·

If the sensor output value does not change (almost no reaction) while performing the Active Test, the sensor may be malfunctioning.

Standard:

GTS Display (Sensor)	Injection Volume	Value
A/F (O2) Sensor Voltage B1S1 (Air fuel ratio sensor (sensor 1))	12.5%	Below 3.1 V
	-12.5%	Higher than 3.4 V
A/F (O2) Sensor Current B1S2 (Air fuel ratio sensor (sensor 2))	12.5%	Below -0.86 mA
	-12.5%	More than 0.33 mA

Result:

Result	Proceed to
Output values are abnormal	A
Malfunction disappears when fuel injection volume is increased	B
Malfunction is still present when fuel injection volume is increased, even if output values are normal	C

Replace the air fuel ratio sensor (sensor 1).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>AIR FUEL RATIO SENSOR (for Sensor 1)>REMOVAL201906,999999,_51,_080777,_0392347,RM100000001HQ2X,

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 1).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION201906,999999,_51,_080777,_0393969,RM100000001I1RE,

Replace the air fuel ratio sensor (sensor 2).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>AIR FUEL RATIO SENSOR (for Sensor 2)>REMOVAL201906,999999,_51,_080777,_0392348,RM100000001HQ30,

HINT:

Perform "Inspection After Repair" after replacing the air fuel ratio sensor (sensor 2).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION201906,999999,_51,_080777,_0393969,RM100000001I1RE,

Replace the fuel injector assemblies of all cylinders.

Click hereEngine / Hybrid System>NR Series (FUEL)>FUEL INJECTOR>REMOVAL201906,202205,_51,_080750,_0393846,RM100000001I0DX,202205,202304,_51,_080750,_0393846,RM10000000231S4,202304,999999,_51,_080750,_0393846,RM100000002BCBA,

HINT:

Perform "Inspection After Repair" after replacing the fuel injector assembly.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION201906,999999,_51,_080777,_0393969,RM100000001I1RE,

Check for air leaks or blockage in the intake system components. If a connection problem or foreign matter is found, repair the connection or remove the foreign matter.

HINT:

·

If there is foreign matter in the intake system components, remove it before proceeding to the next step.

·

If there is no foreign matter in the intake system components, check for foreign matter in the mass air flow meter sub-assembly. If there is foreign matter in the mass air flow meter sub-assembly, remove it.

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Active Test / Activate the Circuit Relay.

Powertrain > Engine > Active Test

Tester Display
Activate the Circuit Relay

50004 372 24

When performing the Active Test, check for an operating sound from the fuel pump (for low pressure side).

OK:

Activate the Circuit Relay	Specified Condition
ON	Operating sound heard
OFF	Operating sound not heard

Attach a fuel pressure gauge and check the fuel pressure when cranking the engine and after stopping the engine.

Click hereEngine / Hybrid System>NR Series (FUEL)>FUEL SYSTEM>ON-VEHICLE INSPECTION201906,202304,_51,_080750,_0393845,RM100000001I0DQ_01_0002,202304,999999,_51,_080750,_0393845,RM100000002BH2I_01_0002,

Standard:

Vehicle State	Specified Condition
Cranking engine	196 to 588 kPa (2.0 to 6.0 kgf/cm2, 28 to 85 psi)
5 minutes after stopping engine	147 kPa (1.5 kgf/cm2, 21 psi) or higher

HINT:

·

If there is foreign matter such as iron particles on the fuel pump (for low pressure side), remove it.

·

Make sure that there are no leaks from the fuel lines, signs of fuel leakage or fuel odors.

·

If the air fuel ratio becomes lean only when the engine is running under a high load and at a high engine speed, clogging of the fuel filter is suspected.

Result:

Proceed to
OK
NG

Connect the GTS to the DLC3.

Start the engine and warm it up.

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / High Fuel Pressure Sensor.

Powertrain > Engine > Data List

Tester Display
High Fuel Pressure Sensor

50003 372 47

Read the values.

Standard:

GTS Display	Condition	Specified Condition
High Fuel Pressure Sensor	· Shift lever position: P · A/C: Off · Engine warmed up · Engine idling	2.4 to 30 MPa

Connect the GTS to the DLC3.

Turn the ignition switch to ON.

Turn the GTS on.

Enter the following menus: Powertrain / Engine / Data List / Fuel Cut History 1 to 4.

Powertrain > Engine > Data List

Tester Display
Fuel Cut History 1
Fuel Cut History 2
Fuel Cut History 3
Fuel Cut History 4

50003 372 328,329,330,331

According to the display on the GTS, read the Data List.

Result:

Result	Proceed to
Other than below	A
The "distance calculated by subtracting the driving distance at the time of the malfunction from the current driving distance" and "distance calculated by subtracting the driving distance of Fuel Cut History 1 to 4 in the Data List from the driving distance of Distance for Control in the Data List" match.*	B

HINT:

*: The Data List fuel cut operation history records the driving distance when the strong knocking repeated prevention control (engine protection) function is performed. Performing initialization of the GTS "Heavy Knock History" causes the Data List item "Fuel Cut History 1 to 4" driving distance to be reset to 0 km.

If "distance calculated by subtracting the driving distance at the time of the malfunction from the current driving distance" and "distance calculated by subtracting the driving distance of Fuel Cut History 1 to 4 from the driving distance of Distance for Control in the Data List" match, explain to the customer that this is the normal control for the repeated prevention control (engine protection).

Inspect other related components.

HINT:

If the malfunctioning part could not be determined by performing the preceding inspections, one of the following malfunctions is suspected.

·

Engine mount deterioration

·

Deposits in the intake manifold or on an intake valve

·

Delay in fuel supply due to adherence of the fuel to the deposits

Inspect the following fuel pump (for low pressure side) related parts:

Inspect the fuel pump control system.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>Fuel Pump Control Circuit201906,999999,_51,_080777,_0393969,RM100000001I1UU,

Repair or replace the malfunctioning part.

Perform "Inspection After Repair" after repairing or replacing the malfunctioning part.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION201906,999999,_51,_080777,_0393969,RM100000001I1RE,

Check that the engine has returned to normal.