DESCRIPTION
Refer to DTC P26CA12.
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DTC No. | Detection Item |
DTC Detection Condition | Trouble Area |
MIL | Note |
---|---|---|---|---|---|
P26CB71 | Engine Coolant Pump Actuator Stuck |
Even though an operation request signal is being output, the engine water pump assembly does not rotate* (1 trip detection logic). |
| Comes on |
|
*: As the frequency signal (WPI) is 4 Hz when the engine water pump assembly is stopped to enable the ECM to detect an open or short in the signal line, the engine water pump assembly speed will be displayed as approximately 160 rpm even when the pump is stopped. If there is an open in the WPI circuit, the engine water pump speed will be displayed as 0 rpm.
Related Data List
DTC No. | Data List |
---|---|
P26CB71 |
|
MONITOR DESCRIPTION
The ECM receives a frequency signal (WPI) from the engine water pump assembly and calculates the speed of the engine water pump assembly. The ECM outputs an operation duty signal (WPO) to steplessly control the speed of the engine water pump assembly. If the duty signal (WPI) indicates that the engine water pump assembly is stopped even though the ECM is outputting an operation duty signal (WPO), the ECM judges that the engine water pump assembly is stuck and stores this DTC.
As the frequency signal (WPI) is 4 Hz when the engine water pump assembly is stopped to enable the ECM to detect an open or short in the signal line, the engine water pump assembly speed will be displayed as approximately 160 rpm even when the pump is stopped.
MONITOR STRATEGY
Related DTCs | P26CB: Engine water pump motor lock |
Required Sensors/Components (Main) | Engine water pump assembly |
Required Sensors/Components (Related) |
- |
Frequency of Operation |
Continuous |
Duration |
Less than 65 seconds |
MIL Operation |
Immediate |
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
All of the following conditions are met |
- |
Engine coolant temperature |
-10°C (-50°F) or higher |
Engine | Running |
Auxiliary battery voltage |
10.5 V or higher |
Engine coolant temperature sensor malfunction (P0117, P0118) |
Not detected |
Engine water pump (IN) malfunction (P26CA) |
Not detected |
Engine water pump (OUT) malfunction (P26CC, P26CD) |
Not detected |
TYPICAL MALFUNCTION THRESHOLDS
All of the following conditions are met |
15 seconds or more |
Out of step operation* |
Active |
Engine water pump (IN) motor speed |
100 rpm or higher |
Engine water pump (IN) motor speed |
Less than 170 rpm |
*: Out of step operation is active when following conditions are met |
2 second or more |
Engine water pump output duty ratio |
30 to 85% |
Engine water pump (IN) motor speed |
100 rpm or higher |
Engine water pump (IN) motor speed |
Less than 170 rpm |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
Click here
HINT:
GTS Display |
Description |
---|---|
NORMAL |
|
ABNORMAL |
|
INCOMPLETE |
|
HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
Refer to DTC P26CA12.
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CAUTION / NOTICE / HINT
HINT:
PROCEDURE
1. | CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P26CB71) |
(a) Read the DTCs.
Powertrain > Engine > Trouble Codes
Result | Proceed to |
---|---|
DTC P26CB71 is output |
A |
DTC P26CB71 and P26CE37 are output | |
DTC P26CB71 and other DTCs are output |
B |
B | GO TO DTC CHART |
|
2. |
CHECK ENGINE COOLANT LEVEL IN RESERVOIR TANK |
(a) Check that the engine coolant level is between the FULL and LOW lines.
Click here
Result | Proceed to |
---|---|
Engine coolant level is above the LOW line |
A |
Engine coolant level is below the LOW line |
B |
A | GO TO STEP 6 |
|
3. |
CHECK FOR ENGINE COOLANT LEAKS |
(a) Check the areas around the engine and heater for engine coolant leaks.
Click here
HINT:
If the engine oil is cloudy during the engine oil level dipstick check, it means that engine coolant has entered the engine lubrication system.
OK:
No leaks.
NG |
GO TO STEP 5 |
|
4. |
ADD ENGINE COOLANT |
(a) Fill the reservoir tank up to the FULL line with engine coolant.
NOTICE:
Make sure not to add engine coolant when the engine is hot.
NEXT | GO TO STEP 6 |
5. |
REPAIR OR REPLACE MALFUNCTIONING PARTS, COMPONENT AND AREA |
(a) Repair any engine coolant leaks.
HINT:
Add engine coolant and perform air bleeding after repair.
|
6. |
PERFORM ACTIVE TEST USING GTS (ACTIVATE THE ELECTRIC WATER PUMP) |
(a) Enter the following menus.
Powertrain > Engine > Active Test
Active Test Display |
---|
Activate the Electric Water Pump |
Data List Display |
---|
Electric Water Pump Speed |
(b) According to the display on the GTS, read the Data List while performing the Active Test.
Standard:
Active Test Operation | Electric Water Pump Speed |
---|---|
3000 rpm | 2000 rpm or higher |
OK | GO TO STEP 8 |
|
7. |
INSPECT ECM (INTERNAL CIRCUIT) |
*a | Front view of wire harness connector (to Engine Water Pump Assembly (Water Inlet Housing)) |
(a) Disconnect the engine water pump assembly (water inlet housing) connector.
(b) Turn the ignition switch to ON.
(c) Measure the resistance according to the value(s) in the table below.
Standard:
Tester Connection | Condition |
Specified Condition |
---|---|---|
C131-3 (SWP) - Body ground |
Ignition switch ON | Resistance fluctuates* |
HINT:
NG | REPLACE ECM |
|
8. |
REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) |
Click here
HINT:
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.
|
9. |
CLEAR DTC |
(a) Clear the DTCs.
Powertrain > Engine > Clear DTCs(b) Turn the ignition switch off and wait for at least 30 seconds.
|
10. |
CHECK WHETHER DTC OUTPUT RECURS (DTC P26CB71) |
(a) Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.
(b) Read the DTCs.
Powertrain > Engine > Trouble CodesHINT:
If no DTC is output, the repair has been successfully completed.
NEXT | END |