RM36D0EC _51 Engine / Hybrid System _083058 M20D-FKS ENGINE CONTROL _0401834 SFI SYSTEM C

M20D-FKS ENGINE CONTROL  SFI SYSTEM  P26CA31  Engine Coolant Pump No Signal  


DESCRIPTION

Refer to DTC P26CA12.

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>P26CA12

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P26CA31 Engine Coolant Pump No Signal The speed of the engine coolant pump calculated from the WPI signal is less than 10 rpm (open or short in the WPI circuit) (1 trip detection logic).
·

Open or short in engine water pump assembly (water inlet housing) circuit

·

Engine water pump assembly (water inlet housing)

·

EFI-MAIN NO. 3 relay

·

ECM


Comes on DTC stored SAE: P26CA

Related Data List
DTC No. Data List
P26CA31
·

Coolant Temperature

·

Electric Water Pump Target Speed

·

Electric Water Pump Speed



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

Required Sensors/Components Engine water pump assembly
Frequency of Operation Continuous

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 hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR



1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

5.

Turn the ignition switch off and wait for at least 30 seconds.

6.

Turn the ignition switch to ON [A].

7.

Turn the GTS on.

8.

Move the shift lever to P [B].

9.

Start the engine and maintain the engine speed at 2500 rpm or more for at least 40 seconds [C].

10.

Enter the following menus: Powertrain / Engine / Trouble Codes [D].

11.

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.



12.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

13.

Input the DTC: P26CA31.

14.

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 [D] again.

·

[A] to [D]: 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 battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.




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

1.CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))
a.
A337498C32
0.396,0.969 0.74,1.26 0.344,0.292 1.188,1.854 1.49,1.177 true 0.458,1.031 0.917,1.229 0.458,0.198 10 false C74 0.135,0.135 0.594,0.333 0.458,0.198 10 false *a 1,1.906 1.458,2.104 0.458,0.198 10 false NWP
*a Front view of wire harness connector
(to Engine Water Pump Assembly (Water Inlet Housing))


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 Switch Condition Specified Condition
C74-2 (NWP) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

2.CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - BODY GROUND)

NG

8.CHECK HARNESS AND CONNECTOR (ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING) - ECM)
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
C74-1 (PGND) - Body ground Always Below 1 Ω



Result:
Proceed to
OK
NG



OK

3.CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

3.CHECK TERMINAL VOLTAGE (POWER SOURCE OF ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))
a.
A337498C33
0.396,0.969 0.74,1.26 0.344,0.292 2.635,1.875 2.25,1.177 true 0.458,1.031 0.917,1.229 0.458,0.198 10 false C74 0.135,0.135 0.594,0.333 0.458,0.198 10 false *a 2.583,1.906 3.042,2.104 0.458,0.198 10 false +B
*a Front view of wire harness connector
(to Engine Water Pump Assembly (Water Inlet Housing))


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 Switch Condition Specified Condition
C74-4 (+B) - Body ground Ignition switch ON 11 to 14 V



Result:
Proceed to
OK
NG



OK

REPLACE ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING)

Click hereEngine / Hybrid System>M20D-FKS (COOLING)>WATER PUMP>REMOVAL


NG

4.INSPECT EFI-MAIN NO. 3 RELAY
4.INSPECT EFI-MAIN NO. 3 RELAY
a.

Inspect the EFI-MAIN NO. 3 relay.

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>RELAY>ON-VEHICLE INSPECTION


Result:
Proceed to
OK
NG



OK

5.CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO. 3 RELAY)

NG

REPLACE EFI-MAIN NO. 3 RELAY

5.CHECK HARNESS AND CONNECTOR (POWER SOURCE OF EFI-MAIN NO. 3 RELAY)
A562514C01
0.083,0.073 0.396,0.229 0.313,0.156 10 false *1 2.167,1.354 2.479,1.51 0.313,0.156 10 false *2
*1 No. 1 Engine Room Relay Block and 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 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



Result:
Proceed to
OK
NG



OK

6.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - BODY GROUND)

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR (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 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



Result:
Proceed to
OK
NG



OK

7.CHECK HARNESS AND CONNECTOR (EFI-MAIN NO. 3 RELAY - ENGINE WATER PUMP ASSEMBLY (WATER INLET HOUSING))

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 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) - C74-4 (+B) Always Below 1 Ω
5 (EFI-MAIN NO. 3 relay) or C74-4 (+B) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



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
C74-2 (NWP) - C71-134 (WPI) Always Below 1 Ω
C74-2 (NWP) or C71-134 (WPI) - Body ground and other terminals Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

REPLACE ECM

Click hereEngine / Hybrid System>M20D-FKS (ENGINE CONTROL)>ECM>REMOVAL


NG

REPAIR OR REPLACE HARNESS OR CONNECTOR