RM3660EC _51 Engine / Hybrid System _080777 NR Series ENGINE CONTROL _0393969 SFI SYSTEM C

NR Series ENGINE CONTROL  SFI SYSTEM  P050A00  Cold Start Idle Control System Performance  


MONITOR DESCRIPTION

This monitor will run when the engine is started at an engine coolant temperature of -10 to 50°C (14 to 122°F). The DTC will be stored after the engine idles for 12 seconds (2 trip detection logic).

The DTC is designed to monitor the idle air control at cold start. When the engine is started at an engine coolant temperature of below 50°C (122°F), the ECM measures the accumulated mass air flow during engine idling. If the accumulated mass air flow does not reach the specified level within 10 seconds, the ECM interprets this as a malfunction. The MIL is illuminated and a DTC is stored when the malfunction is detected in consecutive driving cycles (2 trip detection logic).

The electronic throttle control system controls the idle speed. The electronic throttle control system operates the throttle actuator to open and close the throttle valve, and adjusts the intake air amount to achieve the target idle speed.

NOTICE:

The idle speed control learned values are cleared by performing a learned value reset. Idle speed control learning needs to be performed before this DTC can be stored.


HINT:

Idle speed control learning is performed when the engine is warmed up and has been idling for 5 minutes.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION


A234891E36
2.573,2.667 2.229,2.927 false 0.083,0.021 1.885,0.208 1.802,0.188 10 false P050A00 Detection Logic: 1.396,2.865 2.26,3.073 0.865,0.208 10 false Engine Start 4.75,1.052 6.354,1.208 1.604,0.156 10 false Pass Condition Detected 4.75,2.073 5.542,2.25 0.792,0.177 10 false Malfunction 2.115,2.542 2.271,2.719 0.156,0.177 10 false 0 2.938,2.917 3.688,3.146 0.75,0.229 10 false 2 seconds 4.604,2.917 5.469,3.146 0.865,0.229 10 false 12 seconds 4.885,2.594 5.208,2.771 0.323,0.177 10 false Time 4.75,1.573 5.438,1.729 0.688,0.156 10 false Threshold 1.104,0.74 2.219,1.177 1.115,0.438 10 false Accumulate Mass Air Flow 2.208,3.323 4.979,3.49 2.771,0.167 10 false Engine Coolant Temperature: -10 to 50°C

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P050A00 Cold Start Idle Control System Performance Insufficient mass air flow after a cold start (2 trip detection logic).
·

Throttle with motor body assembly

·

Mass air flow meter sub-assembly

·

PCV system

·

Air cleaner filter element

·

Intake system

·

VVT system

·

Wire harness or connector

·

ECM


Comes on DTC stored SAE Code: P050A

MONITOR STRATEGY

Required Sensors/Components (Main) Throttle with motor body assembly
Required Sensors/Components (Related) Mass air flow meter sub-assembly
Engine coolant temperature sensor
Frequency of Operation Once per driving cycle

TYPICAL MALFUNCTION THRESHOLDS

Accumulated mass air flow Less than 24 g (varies with engine coolant temperature and engine coolant temperature at engine start)

CONFIRMATION DRIVING PATTERN

HINT:
·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR



1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

5.

Turn the ignition switch off and wait for at least 30 seconds.

6.

Start the engine and warm it up for 5 minutes or more.

7.

Stop the engine.

8.

Leave the vehicle outside overnight.

9.

Turn the ignition switch to ON [A].

10.

Turn the GTS on.

11.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

12.

Check that the value of the Data List item Coolant Temperature is between -10 and 50°C (14 and 122°F).

13.

Start the engine and warm it up until the engine coolant temperature is the same as the coolant temperature in the Freeze Frame Data.

14.

Idle the engine for 1 minute or more [B].

15.

Enter the following menus: Powertrain / Engine / Trouble Codes [C].

16.

Read the pending DTC.

HINT:
·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.



17.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

18.

Input the DTC: P050A00.

19.

Check the DTC judgment result.

GTS Display Description
NORMAL
·

DTC judgment completed

·

System normal


ABNORMAL
·

DTC judgment completed

·

System abnormal


INCOMPLETE
·

DTC judgment not completed

·

Perform driving pattern after confirming DTC enabling conditions



HINT:
·

If the judgment result is NORMAL, the system is normal.

·

If the judgment result is ABNORMAL, the system is malfunctioning.

·

If the judgment result is INCOMPLETE, idle the engine for 3 minutes, let the engine cool down, and then perform steps [A] through [C] again.

·

[A] to [C]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.




WIRING DIAGRAM

Refer to DTC P010012 for the mass air flow meter sub-assembly circuit.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P010012

CAUTION / NOTICE / HINT

NOTICE:

Inspect the fuses for circuits related to this system before performing the following procedure.


HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can be helpful in determining whether the vehicle was moving or stationary, whether the engine was warmed up or not, whether the air fuel ratio was lean or rich, as well as other data recorded at the time of a malfunction.


PROCEDURE

1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P050A00)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

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


e.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTC P050A00 is output A
DTC P050A00 and other DTCs are output B


HINT:

If any DTCs other than P050A00 are output, troubleshoot those DTCs first.




A

2.READ VALUE USING GTS (FUEL TRIM)

B

GO TO DTC CHART

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>DIAGNOSTIC TROUBLE CODE CHART


2.READ VALUE USING GTS (FUEL TRIM)
HINT:

Calculate the total fuel trim values to check the characteristic deviation of the mass air flow meter sub-assembly.


a.

Connect the GTS to the DLC3.


b.

Start the engine.


c.

Turn the GTS on.


d.

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

e.

Read the values displayed on the GTS at engine idle.


f.

Add the Short FT B1S1 and Long FT B1S1 values to obtain the total fuel trim.

Standard:
GTS Display Specified Condition
Total of Short FT B1S1 and Long FT B1S1 Between -20 and 20%



Result:
Proceed to
OK
NG



OK

3.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)

NG

5.CHECK PCV VALVE
3.INSPECT THROTTLE WITH MOTOR BODY ASSEMBLY (VISUALLY CHECK THROTTLE VALVE)
a.

Check for foreign matter between the throttle valve and housing. If necessary, clean the throttle body with motor assembly. Also, check that the throttle valve moves smoothly.

OK:

Throttle valve is not contaminated with foreign matter and moves smoothly.



Result:
Proceed to
OK
NG



OK

10.CLEAR DTC

NG

4.REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
4.REPLACE THROTTLE WITH MOTOR BODY ASSEMBLY
a.

Replace the throttle body with motor assembly.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>THROTTLE BODY>REMOVAL

HINT:

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

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
NEXT



NEXT

16.CLEAR DTC
5.CHECK PCV VALVE
a.
A446118C01
1.844,1.031 2.021,0.375 2.021,0.375 2.177,0.375 true 2.24,0.302 2.469,0.479 0.229,0.177 10 true *1
*1 Air Hole Cover


Before inspecting the PCV valve, first check that there is no suction from the air hole cover.

OK:

No suction from air hole cover, and PCV valve operation is normal.



b.

Check PCV valve.

Click hereEngine / Hybrid System>NR Series (EMISSION CONTROL)>PCV VALVE>INSPECTION


Result:
Proceed to
OK
NG



OK

6.CHECK INTAKE SYSTEM

NG

15.REPAIR OR REPLACE PCV SYSTEM
6.CHECK INTAKE SYSTEM
a.

Check the intake system for vacuum leaks.

Click hereEngine / Hybrid System>NR Series (INTAKE / EXHAUST)>INTAKE SYSTEM>ON-VEHICLE INSPECTION

OK:

No leaks from the intake system.



Result:
Proceed to
OK
NG



OK

7.CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY

NG

14.REPAIR OR REPLACE INTAKE SYSTEM
7.CHECK AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
a.

Visually check that the air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.

OK:

The air cleaner filter element sub-assembly is not excessively contaminated with dirt or oil.



Result:
Proceed to
OK
NG



OK

8.PERFORM ACTIVE TEST USING GTS (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE)

NG

13.REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
8.PERFORM ACTIVE TEST USING GTS (OPERATE CAMSHAFT TIMING OIL CONTROL VALVE)
a.

Operate the VVT system through the Active Test, and check if the VVT system is operating normally.

i.

Perform the Active Test, referring to DTC P001100 Procedure (VVT system for intake camshaft).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P001100


ii.

Perform the Active Test, referring to DTC P001400 Procedure (VVT system for exhaust camshaft).

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P001400



Result:
Proceed to
OK
NG



OK

9.READ VALUE USING GTS (MASS AIR FLOW SENSOR)

NG

12.CHECK AND REPAIR VVT SYSTEM
9.READ VALUE USING GTS (MASS AIR FLOW SENSOR)
a.

Connect the GTS to the DLC3.


b.

Start the engine and warm it up.


c.

Turn the GTS on.


d.

Enter the following menus: Powertrain / Engine / Data List / Engine Speed, Mass Air Flow Sensor and Coolant Temperature.

Powertrain > Engine > Data List
Tester Display
Engine Speed
Mass Air Flow Sensor
Coolant Temperature
50003 372 211,215,205

e.

Allow the engine to idle until Coolant Temperature reaches 75°C (167°F) or higher.


f.

Read Mass Air Flow Sensor while maintaining an engine speed of 3000 rpm.

Standard:
GTS Display Condition Specified Condition
Mass Air Flow Sensor
·

Shift lever position: P

·

A/C: Off

·

Engine warmed up

·

Engine Speed: 3000 rpm


Between 4.0 and 14.0 gm/sec



Result:
Proceed to
OK
NG



OK

10.CLEAR DTC

NG

18.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)
10.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

e.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

11.CHECK WHETHER DTC OUTPUT RECURS (DTC P050A00)
11.CHECK WHETHER DTC OUTPUT RECURS (DTC P050A00)
NOTICE:

In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).


a.

Turn the ignition switch to ON.


b.

Turn the GTS on.


c.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List
Tester Display
Coolant Temperature
50003 372 205

d.

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).


e.

Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the Freeze Frame Data.


f.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


g.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility
Tester Display
All Readiness
50005 372 20

h.

Input the DTC: P050A00.


i.

Check the DTC judgment result.

Result:
Result Proceed to
NORMAL
(DTCs are not output) 		A
ABNORMAL
(DTC P050A00 is output) 		B




A

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


B

18.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)
12.CHECK AND REPAIR VVT SYSTEM
a.

Check and repair the VVT system.

HINT:
·

Refer to DTC P001100 Inspection Procedure (VVT system for intake camshaft)

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P001100

·

Refer to DTC P001400 Inspection Procedure (VVT system for exhaust camshaft)

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P001400




Result:
Proceed to
NEXT



NEXT

16.CLEAR DTC
13.REPLACE AIR CLEANER FILTER ELEMENT SUB-ASSEMBLY
a.

Replace the air cleaner filter element sub-assembly.


Result:
Proceed to
NEXT



NEXT

16.CLEAR DTC
14.REPAIR OR REPLACE INTAKE SYSTEM
a.

Repair or replace the intake system.

HINT:

Perform "Inspection After Repair" after repairing or replacing the intake system.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION



Result:
Proceed to
NEXT



NEXT

16.CLEAR DTC
15.REPAIR OR REPLACE PCV SYSTEM
a.

Repair or replace the PCV system.


Result:
Proceed to
NEXT



NEXT

16.CLEAR DTC
16.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

e.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

17.CHECK WHETHER DTC OUTPUT RECURS (DTC P050A00)
17.CHECK WHETHER DTC OUTPUT RECURS (DTC P050A00)
NOTICE:

In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).


a.

Turn the ignition switch to ON.


b.

Turn the GTS on.


c.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List
Tester Display
Coolant Temperature
50003 372 205

d.

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).


e.

Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the Freeze Frame Data.


f.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


g.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility
Tester Display
All Readiness
50005 372 20

h.

Input the DTC: P050A00.


i.

Check the DTC judgment result.

Result:
Result Proceed to
NORMAL
(DTCs are not output) 		A
ABNORMAL
(DTC P050A00 is output) 		B




A

END

B

18.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)
18.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY CONNECTOR CONNECTION)
a.

Check the connection and terminal contact pressure of connectors and wire harnesses between the mass air flow meter sub-assembly and ECM.

Click hereGeneral>INTRODUCTION>HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS>ELECTRONIC CIRCUIT INSPECTION PROCEDURE

HINT:

Repair any problems.



Result:
Proceed to
NEXT



NEXT

19.CLEAR DTC
19.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

e.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

20.CHECK WHETHER DTC OUTPUT RECURS (DTC P050A00)
20.CHECK WHETHER DTC OUTPUT RECURS (DTC P050A00)
NOTICE:

In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).


a.

Turn the ignition switch to ON.


b.

Turn the GTS on.


c.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List
Tester Display
Coolant Temperature
50003 372 205

d.

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).


e.

Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the Freeze Frame Data.


f.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


g.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility
Tester Display
All Readiness
50005 372 20

h.

Input the DTC: P050A00.


i.

Check the DTC judgment result.

Result:
Result Proceed to
NORMAL
(DTCs are not output) 		A
ABNORMAL
(DTC P050A00 is output) 		B




A

END

B

21.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
21.CHECK HARNESS AND CONNECTOR (MASS AIR FLOW METER SUB-ASSEMBLY - ECM)
a.

Disconnect the mass air flow meter sub-assembly connector.


b.

Disconnect the ECM connector.


c.

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

Standard Resistance:
Tester Connection Condition Specified Condition
C25-3 (VG) - C78-92 (VG) Always Below 1 Ω
C25-2 (E2G) - C78-91 (E2G) Always Below 1 Ω
C25-3 (VG) or C78-92 (VG) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

22.REPLACE MASS AIR FLOW METER SUB-ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

22.REPLACE MASS AIR FLOW METER SUB-ASSEMBLY
a.

Replace the mass air flow meter sub-assembly.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>MASS AIR FLOW METER>REMOVAL

HINT:
·

If the result of the inspection performed in step 9 (READ VALUE USING GTS (MASS AIR FLOW SENSOR)) indicated no problem, proceed to the next step without replacing the mass air flow meter sub-assembly.

·

Perform "Inspection After Repair" after replacing the mass air flow meter sub-assembly.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>INITIALIZATION




Result:
Proceed to
NEXT



NEXT

23.CLEAR DTC
23.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

e.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

24.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
24.CONFIRM WHETHER MALFUNCTION HAS BEEN SUCCESSFULLY REPAIRED
NOTICE:

In this operation, the engine must be cold (approximately the same as the engine coolant temperature recorded in the Freeze Frame Data).


a.

Turn the ignition switch to ON.


b.

Turn the GTS on.


c.

Enter the following menus: Powertrain / Engine / Data List / Coolant Temperature.

Powertrain > Engine > Data List
Tester Display
Coolant Temperature
50003 372 205

d.

Check that the engine coolant temperature is between -10 and 50°C (14 and 122°F).


e.

Start the engine and warm it up until the engine coolant temperature is the same as the engine coolant temperature in the Freeze Frame Data.


f.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


g.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

Powertrain > Engine > Utility
Tester Display
All Readiness
50005 372 20

h.

Input the DTC: P050A00.


i.

Check the DTC judgment result.

Result:
Result Proceed to
NORMAL
(DTCs are not output) 		A
ABNORMAL
(DTC P050A00 is output) 		B




A

END

B

REPLACE ECM

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>ECM>REMOVAL