Refer to DTC P26CA12.
| DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Note |
|---|---|---|---|---|---|
| P26CE37 | Engine Coolant Pump Overspeed | The speed of the water inlet housing with water pump sub-assembly is a certain value or more when an operation request signal is being output to the water inlet housing with water pump sub-assembly (1 trip detection logic). | ·
Lack of engine coolant ·
Engine coolant leak ·
Water inlet housing with water pump sub-assembly |
Does not come on | SAE Code: P26CE |
| DTC No. | Data List |
|---|---|
| P26CE37 | ·
Coolant Temperature ·
Electric Water Pump Target Speed ·
Electric Water Pump Speed |
The ECM monitors the speed of the water inlet housing with water pump sub-assembly. When the speed becomes a certain value or more, the ECM judges that the speed is abnormally high and stores a DTC (The MIL does not illuminate).
| Frequency of Operation | Continuous |
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.
Turn the ignition switch to ON.
Turn the GTS on.
Put the engine in Inspection Mode (Maintenance Mode).
Start the engine and maintain an engine speed of 2500 rpm or more for at least 40 seconds.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
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: P26CE37.
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 |
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 the following procedure.
Idle the engine for 5 minutes or more.
Enter the following menus: Powertrain / Engine / Trouble Codes.
Read the pending DTCs.
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.
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 |
If the judgment result is NORMAL, the system is normal.
If the judgment result is ABNORMAL, the system has a malfunction.
Vehicle Control History may be stored in the hybrid vehicle control ECU assembly if the engine is malfunctioning. Certain vehicle condition information is recorded when Vehicle Control History is stored. Reading the vehicle conditions recorded in both the Freeze Frame Data and Vehicle Control History can be useful for troubleshooting.
(Select Powertrain in Health Check and then check the time stamp data.)
If any "Engine Malfunction" Vehicle Control History item has been stored in the hybrid vehicle control ECU assembly, make sure to clear it. However, as all Vehicle Control History items are cleared simultaneously, if any Vehicle Control History items other than "Engine Malfunction" are stored, make sure to perform any troubleshooting for them before clearing Vehicle Control History.
If the engine is run continuously with a low engine coolant level, DTC P26CE37 may be stored.
If the engine coolant level is sufficient but DTC P26CE37 is output, confirm with the customer whether engine coolant was added after the vehicle had been driven with insufficient engine coolant.
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.
Read the DTCs.
| Result | Proceed to |
|---|---|
| DTC P26CE37 is output | A |
| DTC P26CE37 and other DTCs are output | B |
| DTC P26CE37 and P26CB71 are output | C |
If any DTCs other than P26CE37 are output, troubleshoot those DTCs first.
If both DTC P26CB71 (pump stuck) and P26CE37 (pump overspeed) are stored, perform troubleshooting for DTC P26CB71 first as the engine coolant pump assembly may be stuck.
A
B
C
Check that the engine coolant level is between the FULL and LOW lines.
| Result | Proceed to |
|---|---|
| Engine coolant level is above the LOW line | A |
| Engine coolant level is below the LOW line | B |
A
B
Check the areas around the engine and heater for engine coolant leaks.
If the engine oil is cloudy during the engine oil level dipstick check, it means that engine coolant has entered the engine lubrication system.
No leaks.
| Proceed to |
|---|
| OK |
| NG |
OK
NG
Fill the reservoir tank up to the FULL line with engine coolant.
Make sure not to add engine coolant when the engine is hot.
| Proceed to |
|---|
| NEXT |
NEXT
Repair any engine coolant leaks.
Add engine coolant and perform air bleeding after repair.
| Proceed to |
|---|
| NEXT |
NEXT
Bleed air from the cooling system.
| Proceed to |
|---|
| NEXT |
NEXT
Clear the DTCs.
Turn the ignition switch off and wait for at least 30 seconds.
| Proceed to |
|---|
| NEXT |
NEXT
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Read the DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTC P26CB71 is output | B |
| DTC P26CE37 is output | C |
A
B
C
Bleed air from the cooling system.
| Proceed to |
|---|
| NEXT |
NEXT
Clear the DTCs.
Turn the ignition switch off and wait for at least 30 seconds.
| Proceed to |
|---|
| NEXT |
NEXT
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Read the DTCs.
| Result | Proceed to |
|---|---|
| DTCs are not output | A |
| DTC P26CE37 is output | B |
A
B
When replacing any cooling system parts, if excessive deposits of rust or scale exist or the concentration of the engine coolant is abnormal, replace the engine coolant.
| Proceed to |
|---|
| NEXT |
NEXT
Clear the DTCs.
Turn the ignition switch off and wait for at least 30 seconds.
| Proceed to |
|---|
| NEXT |
NEXT
Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
Read the DTCs.
If no DTC is output, the repair has been successfully completed.
| Proceed to |
|---|
| NEXT |
NEXT