- Coolant Temperature
- Electric Water Pump Target Speed
- Electric Water Pump Speed
| Last Modified: 01-30-2024 | 6.11:8.1.0 | Doc ID: RM100000001QEYQ |
| Model Year Start: 2021 | Model: RAV4 | Prod Date Range: [08/2020 - ] |
| Title: A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P26CA31; Engine Coolant Pump No Signal; 2021 - 2024 MY RAV4 RAV4 HV [08/2020 - ] | ||
|
DTC |
P26CA31 |
Engine Coolant Pump No Signal |
DESCRIPTION
Refer to DTC P26CA12.
Click here
![2021 - 2024 MY RAV4 RAV4 HV [08/2020 - ]; A25A-FXS (ENGINE CONTROL): SFI SYSTEM: P26CA12; Engine Coolant Pump Circuit Short to Battery](/t3Portal/stylegraphics/info.gif)
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
MIL |
Memory |
Note |
|---|---|---|---|---|---|---|
|
P26CA31 |
Engine Coolant Pump No Signal |
The speed of the engine water pump calculated from the WPI signal is less than 10 rpm (open or short in the WPI circuit) (1 trip detection logic). |
|
Comes on |
DTC stored |
|
Related Data List
|
DTC No. |
Data List |
|---|---|
|
P26CA31 |
|
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. 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 the engine water pump assembly speed is calculated to be less than 10 rpm, the ECM judges that there is an open or short in the WPI circuit and stores this DTC.
MONITOR STRATEGY
|
Related DTCs |
P26CA: Engine water pump circuit verify pulse input |
|
Required Sensors/Components (Main) |
Engine water pump assembly |
|
Required Sensors/Components (Related) |
- |
|
Frequency of Operation |
Continuous |
|
Duration |
15 seconds |
|
MIL Operation |
Immediate |
|
Sequence of Operation |
None |
TYPICAL ENABLING CONDITIONS
|
Monitor runs whenever the following DTCs are not stored |
None |
|
All of the following conditions are met |
- |
|
Auxiliary battery voltage |
8 V or higher |
|
Ignition switch |
On |
|
Time after ignition switch off to ON |
0.5 seconds or more |
TYPICAL MALFUNCTION THRESHOLDS
|
Engine water pump speed |
Less than 10 rpm |
CONFIRMATION DRIVING PATTERN
HINT:
-
After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.
Click here
-
When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.
Click here
- Connect the Techstream to the DLC3.
- Turn the ignition switch to ON.
- Turn the Techstream 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 [A].
- Turn the Techstream on.
-
Put the engine in Inspection Mode (Maintenance Mode).
Click here
- Start the engine and maintain the engine speed at 2500 rpm or more for at least 40 seconds [B].
- 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: P26CA31.
-
Check the DTC judgment result.
Techstream 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.
-
[A] to [C]: Normal judgment procedure.
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
- When clearing the permanent DTCs, do not disconnect the cable from the auxiliary battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.
WIRING DIAGRAM
Refer to DTC P26CA12.
Click here
CAUTION / NOTICE / HINT
NOTICE:
- Inspect the fuses for circuits related to this system before performing the following procedure.
-
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.
for AWD with NICKEL METAL HYDRIDE BATTERY
Click here
for LITHIUM-ION BATTERY
Click here
(Select Powertrain in Health Check and then check the time stamp data.)
Click here
-
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.
for AWD with NICKEL METAL HYDRIDE BATTERY
Click here
for LITHIUM-ION BATTERY
Click here
HINT:
Read Freeze Frame Data using the Techstream. 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 ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)) |
|
*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 voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C23-5 (NWP) - Body ground |
Ignition switch ON |
11 to 14 V |
| NG |
|
|
|
2. |
CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - BODY GROUND) |
(a) Disconnect the engine water pump assembly (water inlet housing) connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C23-3 (PGN2) - Body ground |
Always |
Below 1 Ω |
|
C23-6 (PGND) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
3. |
CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)) |
|
*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 voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
C23-1 (+B2) - Body ground |
Ignition switch ON |
11 to 14 V |
|
C23-4 (+B) - Body ground |
Ignition switch ON |
11 to 14 V |
| OK |
|
REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)
|
|
|
4. |
INSPECT EFI-MAIN NO. 3 RELAY |
(a) Inspect the EFI-MAIN NO. 3 relay.
Click here
| NG |
|
REPLACE EFI-MAIN NO. 3 RELAY |
|
|
5. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO. 3 RELAY) |
|
*1 |
No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly |
|
*2 |
EFI-MAIN NO. 3 Relay |
(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
3 (EFI-MAIN NO. 3 relay) - Body ground |
Always |
11 to 14 V |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (AUXILIARY BATTERY - EFI-MAIN NO. 3 RELAY) |
|
|
6. |
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND) |
(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
1 (EFI-MAIN NO. 3 relay) - Body ground |
Always |
Below 1 Ω |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
7. |
CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)) |
(a) Remove the EFI-MAIN NO. 3 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
(b) Disconnect the engine water pump assembly (water inlet housing) connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
5 (EFI-MAIN NO. 3 relay) - C23-1 (+B2) |
Always |
Below 1 Ω |
|
5 (EFI-MAIN NO. 3 relay) - C23-4 (+B) |
Always |
Below 1 Ω |
|
5 (EFI-MAIN NO. 3 relay), C23-1 (+B2) or C23-4 (+B) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR (EFI-MAIN NO. 1 RELAY - EFI-MAIN NO. 3 RELAY) |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
8. |
CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - ECM) |
(a) Disconnect the engine water pump assembly (water inlet housing) 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 |
|---|---|---|
|
C23-5 (NWP) - C45-51 (WPI) |
Always |
Below 1 Ω |
|
C23-5 (NWP) or C45-51 (WPI) - Body ground and other terminals |
Always |
10 kΩ or higher |
| OK |
|
REPLACE ECM
|
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|