DESCRIPTION
The ECM calculates the necessary cooling amount based on the engine coolant temperature, engine speed and vehicle speed, and controls the water inlet housing with water pump sub-assembly accordingly. The water inlet housing with water pump sub-assembly controls the speed of the water inlet housing with water pump sub-assembly steplessly and optimally based on a duty cycle signal sent by the ECM, which reduces engine warm-up time, improves fuel efficiency and reduces cooling loss.
DTC No. | Detection Item | DTC Detection Condition | Trouble Area | MIL | Memory | Note |
---|---|---|---|---|---|---|
P26CA12 | Engine Coolant Pump Circuit Short to Battery | The operation duty ratio signal (WPO) of the water inlet housing with water pump sub-assembly is a certain value or more when the water inlet housing with water pump sub-assembly operation signal is being output (1 trip detection logic). |
| Comes on | DTC stored | SAE Code: P26CD |
DTC No. | Data List |
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P26CA12 |
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MONITOR DESCRIPTION
The ECM outputs an operation duty signal (WPO) to steplessly control the speed of the water inlet housing with water pump sub-assembly. The ECM outputs an operation duty signal (WPO) to the water inlet housing with water pump sub-assembly and monitors the actual duty signal (WPO) being output. When the actual operation duty signal (WPO) exceeds a certain value when outputting an operation duty signal (WPO) to the water inlet housing with water pump sub-assembly, the ECM detects a malfunction and stores a DTC.
MONITOR STRATEGY
Related DTCs | P26CD: Engine water pump circuit range check (High voltage) |
Required Sensors/Components (Main) | Water inlet housing with water pump sub-assembly |
Required Sensors/Components (Related) | - |
Frequency of Operation | Continuous |
Duration | 3 seconds |
MIL Operation | Immediate |
Sequence of Operation | None |
TYPICAL ENABLING CONDITIONS
All of the following conditions are met | - |
Auxiliary battery voltage | 8 V or higher |
Power switch | On (IG) |
Time after power switch off to on (IG) | 0.5 seconds or more |
Output duty cycle | 30 to 85% |
Engine water pump circuit pulse input fail (P26CA) | Not detected |
TYPICAL MALFUNCTION THRESHOLDS
Both of the following conditions are met | - |
Water inlet housing with water pump sub-assembly output terminal voltage level | High |
Water inlet housing with water pump sub-assembly output signal | No signal |
CONFIRMATION DRIVING PATTERN
HINT:
Click here
Click here
Click here
HINT:
Techstream Display | Description |
---|---|
NORMAL |
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ABNORMAL |
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INCOMPLETE |
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HINT:
The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Click here
(Select Powertrain in Health Check and then check the time stamp data.)
Click here
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 WATER INLET HOUSING WITH WATER PUMP SUB-ASSEMBLY) |
*a | Front view of wire harness connector (to Water Inlet Housing with Water Pump Sub-assembly) |
(a) Disconnect the water inlet housing with water pump sub-assembly connector.
(b) Turn the power switch on (IG).
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection | Condition | Specified Condition |
---|---|---|
C66-2 (SWP) - Body ground | Power switch on (IG) | Below 1 V |
NG | GO TO STEP 3 |
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2. | INSPECT ECM (INTERNAL CIRCUIT) |
*a | Front view of wire harness connector (to Water Inlet Housing with Water Pump Sub-assembly) |
(a) Disconnect the water inlet housing with water pump sub-assembly connector.
(b) Turn the power switch on (IG).
(c) Measure the resistance according to the value(s) in the table below.
Standard:
Tester Connection | Condition | Specified Condition |
---|---|---|
C66-2 (SWP) - Body ground | Power switch on (IG) | Resistance fluctuates* |
HINT:
OK | REPLACE WATER INLET HOUSING WITH WATER PUMP SUB-ASSEMBLY |
NG | REPLACE ECM |
3. | CHECK HARNESS AND CONNECTOR (WATER INLET HOUSING WITH WATER PUMP SUB-ASSEMBLY - ECM) |
(a) Disconnect the water inlet housing with water pump sub-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 |
---|---|---|
C66-2 (SWP) or C88-50 (WPO) - Other terminals | Always | 10 kΩ or higher |
OK | REPLACE ECM |
NG | REPAIR OR REPLACE HARNESS OR CONNECTOR |