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

NR Series ENGINE CONTROL  SFI SYSTEM  P023A12  Charge Air Cooler Coolant Pump Control Circuit Short to Battery  


DESCRIPTION

The turbocharger and intercooler cooling system is a water cooling system that is independent from the engine cooling system. It uses a dedicated radiator and electric water pump assembly to cool the intercooler and turbocharger. The electric water pump assembly uses duty cycle signals sent from the ECM to provide stepless, optimal control of the electric water pump assembly speed.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P023A12 Charge Air Cooler Coolant Pump Control Circuit Short to Battery Electric water pump assembly output voltage is specified value or higher (1 trip detection logic).
·

Short in electric water pump assembly circuit

·

Electric water pump assembly

·

ECM


Does not come on DTC stored SAE Code: P023C

Related Data List
DTC No. Data List
P023A12
·

Intercooler Water Pump Speed

·

Intercooler Water Pump



MONITOR DESCRIPTION

The electric water pump assembly operates steplessly according to duty cycle signals from the ECM. The ECM monitors the current operation speed of the electric water pump assembly. When the actual drive duty cycle ratio deviates from the target drive duty cycle, the ECM determines there is a malfunction and stores this DTC.

CONFIRMATION DRIVING PATTERN

1.
A330723E05
3.042,1.854 2.635,1.344 2.635,1.344 2.438,1.344 false 0.25,0.292 1.354,0.542 1.104,0.25 10 false Vehicle Speed 0.76,0.677 1.375,0.875 0.615,0.198 10 false 50 km/h 0.927,2.042 1.542,2.24 0.615,0.198 10 false Idling 0.396,2.365 1.313,2.75 0.917,0.385 10 false Ignition Switch ON 5.625,3.375 5.99,3.625 0.365,0.25 10 false [C] 1.427,1.26 2.729,1.563 1.302,0.302 10 false Fully depressed 2.198,1.885 2.656,2.083 0.458,0.198 10 false [A] 3.313,1.219 3.792,1.417 0.479,0.198 10 false [B]

2.

Connect the GTS to the DLC3.

3.

Turn the ignition switch to ON.

4.

Turn the GTS on.

5.

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

6.

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

7.

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

8.

Turn the GTS on.

9.

Accelerate to 50 km/h (31 mph) or more with the accelerator pedal fully depressed [B].

CAUTION:

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


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: P023A12.

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 is NORMAL, the system is normal.

·

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

·

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




WIRING DIAGRAM

A426246E04
0.479,0.698 2.625,0.896 2.146,0.198 10 false EFI-MAIN NO. 2 5.729,0.448 6.344,0.646 0.615,0.198 10 false IWPO 5.719,1.646 6.333,1.844 0.615,0.198 10 false IWPI 3.917,2.083 4.375,2.281 0.458,0.198 10 false A38 1.76,2.625 1.917,2.823 0.156,0.198 10 false 3 1.76,2.917 1.917,3.115 0.156,0.198 10 false 5 3.042,2.625 3.198,2.823 0.156,0.198 10 false 4 3.042,2.917 3.198,3.115 0.156,0.198 10 false 6 1.781,3.677 2.094,3.875 0.313,0.198 10 false 1B 1.813,3.833 5.333,4.031 3.521,0.198 10 false No. 1 Integration Relay 0.469,2.885 2.615,3.083 2.146,0.198 10 false EFI-MAIN NO. 1 0.458,3.24 1.833,3.438 1.375,0.198 10 false BATT-MAIN 0.625,3.917 1.698,4.115 1.073,0.198 10 false Battery 5.875,3.677 6.333,3.875 0.458,0.198 10 false A46 6.229,3.677 6.688,3.875 0.458,0.198 10 false ECM 5.719,3.031 6.333,3.229 0.615,0.198 10 false MREL 5.469,0.448 5.781,0.646 0.313,0.198 10 false 24 5.458,1.646 5.771,1.844 0.313,0.198 10 false 11 5.458,2.906 5.771,3.104 0.313,0.198 10 false 46 5.115,0.448 5.271,0.646 0.156,0.198 10 false 3 5.125,1.646 5.281,1.844 0.156,0.198 10 false 2 3.865,0.448 4.021,0.646 0.156,0.198 10 false 4 3.875,1.646 4.031,1.844 0.156,0.198 10 false 1 4.073,0.552 4.385,0.75 0.313,0.198 10 false +B 4.688,0.552 5.146,0.75 0.458,0.198 10 false SWP 4.083,1.76 4.698,1.958 0.615,0.198 10 false PGND 4.688,1.74 5.146,1.938 0.458,0.198 10 false NWP 3.917,2.24 5.24,2.99 1.323,0.75 10 false Electric Water Pump Assembly 1.948,1.156 4.094,1.354 2.146,0.198 10 false EFI-MAIN NO. 2 1.979,0.448 2.135,0.646 0.156,0.198 10 false 5 1.979,0.729 2.135,0.927 0.156,0.198 10 false 2 2.792,0.448 2.948,0.646 0.156,0.198 10 false 3 2.792,0.719 2.948,0.917 0.156,0.198 10 false 1 2.167,3.333 3.396,3.531 1.229,0.198 10 false EFI-MAIN

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 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 TERMINAL VOLTAGE (POWER SOURCE OF ELECTRIC WATER PUMP ASSEMBLY)
A376494C31
0.219,0.99 0.521,1.167 0.302,0.177 2.063,1.854 1.875,1.177 true 0.115,0.094 0.427,0.292 0.313,0.198 10 false *a 1.969,1.865 2.51,2.125 0.542,0.26 10 false SWP 0.25,0.99 0.708,1.188 0.458,0.198 10 false A38
*a Front view of wire harness connector
(to Electric Water Pump Assembly)


a.

Disconnect the electric water pump assembly connector.


b.

Turn the ignition switch to ON.


c.

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

Standard Voltage:
Tester Connection Condition Specified Condition
A38-3 (SWP) - Body ground Ignition switch ON Below 1 V



Result:
Proceed to
OK
NG



OK

2.INSPECT ECM (SWP TERMINAL)

NG

3.CHECK HARNESS AND CONNECTOR (ELECTRIC WATER PUMP ASSEMBLY - ECM)
2.INSPECT ECM (SWP TERMINAL)
a.

Disconnect the electric water pump assembly 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 / Active Test / Control the Intercooler Water Pump.

Powertrain > Engine > Active Test
Tester Display
Control the Intercooler Water Pump
50004 372 9

f.

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

Standard Resistance:
Tester Connection Condition Specified Condition
A38-3 (SWP) - Body ground Active Test OFF → ON Active Test OFF: Resistance stabilized → ON: Resistance changes*


HINT:

*: The transistor inside the ECM performs duty control according to the Active Test being operated. The resistance of the SWP terminal changes while the Active Test is on due to duty control. If the resistance is stable while the Active Test is off and changes while the Active Test is on, the transistor is working correctly. If the transistor does not operate when the Active Test is on, there may be a malfunction in the ECM.



Result:
Proceed to
OK
NG



OK

REPLACE ELECTRIC WATER PUMP ASSEMBLY

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


NG

REPLACE ECM

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


3.CHECK HARNESS AND CONNECTOR (ELECTRIC WATER PUMP ASSEMBLY - ECM)
a.

Disconnect the electric water pump 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
A38-3 (SWP) or A46-24 (IWPO) - 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