NR Series ENGINE CONTROL SFI SYSTEM P023A14 Charge Air Cooler Coolant Pump Control Circuit Short to Ground or Open
DESCRIPTION
Refer to DTC P023A12.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
|---|---|---|---|---|---|---|
| P023A14 | Charge Air Cooler Coolant Pump Control Circuit Short to Ground or Open | Electric water pump assembly output voltage is specified value or less (1 trip detection logic). | ·
Open or short in electric water pump assembly circuit ·
Electric water pump assembly ·
EFI-MAIN NO. 2 relay ·
ECM |
Does not come on | DTC stored | SAE Code: P023B |
| DTC No. | Data List |
|---|---|
| P023A14 | ·
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
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).
Turn the ignition switch off and wait for at least 30 seconds.
Start the engine and warm it up until the engine coolant temperature reaches 75°C (167°F) or higher [A].
Turn the GTS on.
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.
Enter the following menus: Powertrain / Engine / Trouble Codes [C].
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.
Enter the following menus: Powertrain / Engine / Utility / All Readiness.
Input the DTC: P023A14.
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
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
Disconnect the electric water pump assembly connector.
Connect the GTS to the DLC3.
Turn the ignition switch to ON.
Turn the GTS on.
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
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
NG
Disconnect the electric water pump 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 A38-3 (SWP) - A46-24 (IWPO) Always Below 1 Ω A38-3 (SWP) or A46-24 (IWPO) - Body ground Always 10 kΩ or higher
- Result:
Proceed to OK NG
OK
NG