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

NR Series ENGINE CONTROL  SFI SYSTEM  P026A00  Charge Air Cooler Efficiency Below Threshold  


DESCRIPTION

Refer to DTC P023A12.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>SFI SYSTEM>P023A12

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P026A00 Charge Air Cooler Efficiency Below Threshold Boost temperature is 85°C (176°F) or higher when intake air flow rate is 18 gm/sec or more (2 trip detection logic).
·

Lack of engine coolant

·

Engine coolant leak

·

Electric water pump assembly

·

Intake air temperature sensor (No. 2 turbo pressure sensor)

·

Intercooler cooling radiator assembly

·

ECM


Does not come on DTC stored SAE Code: P026A

MONITOR DESCRIPTION

The ECM detects this DTC based on the signals from the intake air temperature sensor (No. 2 turbo pressure sensor). The ECM stores a DTC if the intake air temperature sensor value is outside of the normal range.

CONFIRMATION DRIVING PATTERN

A232052E21
1.135,0.865 2.198,1.146 1.063,0.281 10 false 30 gm/sec 1.417,2 1.938,2.229 0.521,0.229 10 false Idling 0.677,2.385 2.146,2.771 1.469,0.385 10 false Ignition Switch ON 2.385,2.219 2.615,2.385 0.229,0.167 10 false [A] 4.708,0.417 4.917,0.583 0.208,0.167 10 false [B] 6.25,3.229 6.448,3.427 0.198,0.198 10 false [C] 4.229,3.021 5.927,3.292 1.698,0.271 10 false 10 seconds or more 0.667,0.115 1.979,0.406 1.313,0.292 10 false Intake air flow rate

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 until the engine coolant temperature reaches 70°C (158°F) or higher [A].

7.

Turn the GTS on.

8.

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

9.

Drive the vehicle for at least 10 seconds with an intake air flow rate (Mass Air Flow Sensor) of 30 gm/sec or more [B].

CAUTION:

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


HINT:

Drive the vehicle under load, such as up a slope or acceleration driving.


10.

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

11.

Read the pending DTCs.

HINT:
·

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

·

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



12.

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

13.

Input the DTC: P026A00.

14.

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 shows NORMAL, the system is normal.

·

If the judgment result shows ABNORMAL, the system has a malfunction.

·

If the judgment result shows INCOMPLETE, perform steps [B] through [C] again.




CAUTION / NOTICE / HINT

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 help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.


PROCEDURE

1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P026A00)
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 P026A00 is output A
DTC P026A00 and other DTCs are output B


HINT:

If any DTCs other than P026A00 are output, troubleshoot those DTCs first.




A

2.READ VALUE USING GTS (INTAKE AIR TEMPERATURE B1S1 (TURBO))

B

GO TO DTC CHART

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


2.READ VALUE USING GTS (INTAKE AIR TEMPERATURE B1S1 (TURBO))
a.

Remove the No. 2 turbo pressure sensor.

HINT:

Do not disconnect the connector.



b.

Connect the GTS to the DLC3.


c.

Turn the ignition switch to ON.


d.

Turn the GTS on.


e.

Enter the following menus: Powertrain / Engine / Data List / Intake Air Temperature B1S1 (Turbo).

Powertrain > Engine > Data List
Tester Display
Intake Air Temperature B1S1 (Turbo)
50003 372 310

f.

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

Result:
Result Proceed to
Other than below A
Difference between value of Intake Air Temperature B1S1 (Turbo) and actual ambient air temperature is 10°C (18°F) or higher B




A

3.CHECK INTERCOOLER COOLING RADIATOR ASSEMBLY

B

9.INSPECT INTAKE AIR TEMPERATURE SENSOR
3.CHECK INTERCOOLER COOLING RADIATOR ASSEMBLY
a.

Check for deformation and blockage of the intercooler cooling radiator assembly.

OK:

Intercooler cooling radiator assembly does not have any deformation or blockage.



Result:
Proceed to
OK
NG



OK

4.PERFORM ACTIVE TEST USING GTS (CONTROL THE INTERCOOLER WATER PUMP)

NG

REPAIR OR REPLACE INTERCOOLER COOLING RADIATOR ASSEMBLY

4.PERFORM ACTIVE TEST USING GTS (CONTROL THE INTERCOOLER WATER PUMP)
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.

NOTICE:

Be sure to perform the inspection with the battery voltage at 11 V or higher.


HINT:

If the battery voltage is low, the electric water pump assembly may stop operating.



d.

Enter the following menus: Powertrain / Engine / Active Test / Control the Intercooler Water Pump / Data List / Intercooler Water Pump Speed.

Powertrain > Engine > Active Test
Active Test Display
Control the Intercooler Water Pump
Data List Display
Intercooler Water Pump Speed
50004 372 9 104

e.

According to the display on the GTS, read the Data List while the Active Test "Control the Intercooler Water Pump" is set to 85%.

Result:
GTS Operation Intercooler Water Pump Speed Proceed to
85% 4000 rpm or less A
7000 rpm or higher B
Other than above C




A

REPLACE ELECTRIC WATER PUMP ASSEMBLY

Click hereEngine / Hybrid System>NR Series (INTAKE / EXHAUST)>WATER PUMP>REMOVAL


B

5.CHECK COOLANT LEVEL AT RESERVOIR

C

7.CLEAR DTC
5.CHECK COOLANT LEVEL AT RESERVOIR
a.

Check the coolant (for intercooler) level.

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

Result:
Result Proceed to
At or below reservoir tank LOW level A
At or above reservoir tank LOW level B




A

6.CHECK FOR COOLANT LEAK

B

REPLACE ELECTRIC WATER PUMP ASSEMBLY

Click hereEngine / Hybrid System>NR Series (INTAKE / EXHAUST)>WATER PUMP>REMOVAL


6.CHECK FOR COOLANT LEAK
a.

Check the turbocharger and intercooler cooling system for coolant leaks.

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

OK:

No leaks in turbocharger and intercooler cooling system.



Result:
Proceed to
OK
NG



OK

ADD COOLANT

Click hereEngine / Hybrid System>NR Series (INTAKE / EXHAUST)>COOLANT (for Intercooler)>REPLACEMENT


NG

REPAIR COOLANT LEAK

7.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

8.CHECK WHETHER DTC OUTPUT RECURS (DTC P026A00)
8.CHECK WHETHER DTC OUTPUT RECURS (DTC P026A00)
a.

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


b.

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


c.

Read the pending DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTCs are not output A
DTC P026A00 is output B




A

CHECK FOR INTERMITTENT PROBLEMS

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


B

REPLACE ECM

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


9.INSPECT INTAKE AIR TEMPERATURE SENSOR
a.

Inspect the intake air temperature sensor.

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>MANIFOLD ABSOLUTE PRESSURE SENSOR>INSPECTION


Result:
Proceed to
OK
NG



OK

10.CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)

NG

REPLACE NO. 2 TURBO PRESSURE SENSOR

Click hereEngine / Hybrid System>NR Series (ENGINE CONTROL)>MANIFOLD ABSOLUTE PRESSURE SENSOR>REMOVAL


10.CHECK HARNESS AND CONNECTOR (INTAKE AIR TEMPERATURE SENSOR - ECM)
a.

Disconnect the intake air temperature sensor 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
C99-4 (THIM) - C78-107 (THIM) Always Below 1 Ω
C99-2 (E2) - C78-137 (EPIM) Always Below 1 Ω
C99-4 (THIM) or C78-107 (THIM) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

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


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR