DTC B14C7-7F: Electric Water Pump Actuator Stuck Off [08/2023 - ]: Procedure

1. Check for DTCs.

   Body Electrical > Air Conditioner > Trouble Codes 

   HINT: 

   Check even when the DTCs detected for temporary failures.

   Result

   Result	Proceed to
   B1498-87 is not output	A
   B1498-87 is output	B

   Relevant DTC
   B1498-87	A/C Inverter Local Missing Message

Result: 

B 

GO TO DIAGNOSTIC TROUBLE CODE CHART (B1498-87). Refer to  DTC B1498-87: A/C Inverter Local Missing Message [08/2023 - ] 

Result: 

A 

See step  2

Pre-procedure1

• Disconnect the A63 electric water pump (heater pump assembly) connector.

• Measure the voltage according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Electric Water Pump (Heater Pump Assembly))

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A63-2 (+B) - Body ground	Ignition switch ON	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Pre-procedure1

• Disconnect the A63 electric water pump (heater pump assembly) connector.

• Measure the resistance according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Electric Water Pump (Heater Pump Assembly))

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A63-1 (-) - Body ground	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  4

Pre-procedure1

• Disconnect the A63 electric water pump (heater pump assembly) connector.
• Disconnect the C48 and C50 air conditioning amplifier assembly connectors.

• Measure the resistance according to the value(s) in the table below.

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A63-4 (PWMI) - C50-17 (WP)	Always	Below 1 Ω	Ω
  A63-3 (PWMS) - C48-12 (WIP)	Always	Below 1 Ω	Ω
  A63-4 (PWMI) or C50-17 (WP) - Other terminals and body ground	Always	10 kΩ or higher	kΩ
  A63-3 (PWMS) or C48-12 (WIP) - Other terminals and body ground	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  5

Pre-procedure1

• Disconnect the C50 air conditioning amplifier assembly connector.

• Measure the voltage according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Air Conditioning Amplifier Assembly)

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  C50-17 (WP) - Body ground	Ignition switch ON	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPLACE ELECTRIC WATER PUMP (HEATER PUMP ASSEMBLY). Refer to  REMOVAL [08/2023 - ] 

Result: 

OK 

See step  6

Pre-procedure1

• Connect the C50 air conditioning amplifier assembly connector.

• Using an oscilloscope, check the waveform.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component with harness connected (Air Conditioning Amplifier Assembly)

  -

  -

  OK

  The waveform displays properly.

  Item	Content
  Tester Connection	C50-17 (WP) - Body ground
  Tool Setting	5 V/DIV., 100 ms./DIV.
  Condition	Ignition switch ON Set Temperature: MAX HOT Blower switch: LO or more

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

OK 

See step  7

Pre-procedure1

• Disconnect the A63 electric water pump (heater pump assembly) connector.

• Measure the voltage according to the value(s) in the table below.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Front view of wire harness connector (to Electric Water Pump (Heater Pump Assembly))

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A63-3 (PWMS) - Body ground	Ignition switch ON	4.75 to 5.25 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

OK 

REPLACE ELECTRIC WATER PUMP (HEATER PUMP ASSEMBLY). Refer to  REMOVAL [08/2023 - ] 

Result: 

NG 

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY. Refer to  REMOVAL [10/2022 - ]