DTC P314A-31: Motor Electronics Coolant Pump "A" No Signal [10/2022 - ]: Procedure

Refer to PROCEDURE - Step 4

Result

Result: 

NEXT 

See step  2

HINT: 

• When the auxiliary battery voltage is low, the inverter water pump with motor assembly may not operate.
• When the inverter water pump with motor assembly signal line (SWP - IWP) is open or its connection is faulty, the inverter water pump with motor assembly is operated forcibly.

Pre-procedure1

• None.

• Perform the "Activate the Inverter Water Pump" Active Test.

  Powertrain > Hybrid Control > Active Test 

  Tester Display
  Activate the Inverter Water Pump

• Touch the inverter water pump assembly and check that it is operating (vibrating).

  OK

  The inverter water pump is operating (vibrating).

  HINT: 

  Perform the Active Test with the inverter coolant temperature between -15 and 65°C (5 to 149°F).

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.

Result: 

NG 

See step  9

Result: 

OK 

See step  3

Refer to PROCEDURE - Step 1

Result

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  4

HINT: 

Refer to PROCEDURE - Step 7

Result

Result: 

NG 

CONNECT SECURELY 

Result: 

OK 

See step  5

Pre-procedure1

• Disconnect the hybrid vehicle control ECU connector.
• Disconnect the inverter water pump assembly connector.

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

  Standard Resistance (Check for Open)

  Tester Connection	Condition	Specified Condition	Result
  A21-33 (NIWP) - A42-2 (NWP)	Ignition switch off	Below 1 Ω	Ω

  Standard Resistance (Check for Short)

  Tester Connection	Condition	Specified Condition	Result
  A21-33 (NIWP) or A42-2 (NWP) - Body ground and other terminals	Ignition switch off	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the inverter water pump assembly connector.
• Reconnect the hybrid vehicle control ECU connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  6

Pre-procedure1

• Disconnect the inverter water pump assembly connector.

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

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component with harness connected (Hybrid Vehicle Control ECU)

  -

  -

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A21-33 (NIWP) - C59-1 (E1)	Ignition switch ON	11 to 14 V	V

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Reconnect the inverter water pump assembly connector.

Result: 

NG 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

OK 

See step  7

Refer to PROCEDURE - Step 4

Result

Result: 

NEXT 

See step  8

HINT: 

When the auxiliary battery voltage is low, the inverter water pump assembly may not operate.

Pre-procedure1

• Perform the "Activate the Inverter Water Pump" Active Test.

  Powertrain > Hybrid Control > Active Test 

  Tester Display
  Activate the Inverter Water Pump

• Connect an oscilloscope between the hybrid vehicle control ECU terminals specified in the table below, and measure the waveform.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a

  Component with harness connected (Hybrid Vehicle Control ECU)

  -

  -

  Item	Content
  Terminal	A21-33 (NIWP) - C59-1 (E1)
  Equipment Setting	5 V/DIV., 5 ms./DIV.
  Condition	Ignition switch ON, during Active Test

  OK

  The period of the wavelength is 13 msec or less.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.

Result: 

OK 

REPLACE HYBRID VEHICLE CONTROL ECU ASSEMBLY. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

See step  28

HINT: 

Refer to PROCEDURE - Step 7

Result

Result: 

NG 

CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR) 

Result: 

OK 

See step  10

1. Check installation condition of the INV W/PMP relay.

   OK

   INV W/PMP relay is installed correctly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  17

Result: 

OK 

See step  11

Pre-procedure1

• Remove the IGCT NO. 1 relay from the No. 1 engine room relay block and No. 1 junction block assembly.
• Remove the INV W/PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  5 (IGCT NO. 1 relay holder) - 1 (INV W/PMP relay holder)	Ignition switch off	Below 1 Ω	Ω

  NOTE:

  Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.

  HINT: 

  • Connectors

    Slightly shake the connector vertically and horizontally.

  • Wire Harness

    Slightly shake the wire harness vertically and horizontally.

    The connector joint and fulcrum of the vibration are the major areas that should be checked thoroughly.

  • No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

    Apply slight vibration with a finger to the No. 1 engine room relay block and No. 1 junction block assembly and check whether a malfunction occurs.

  • INV W/PMP fuse

    Apply slight vibration with a finger to the INV W/PMP fuse and check whether a malfunction occurs.

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Example
  *b	Shake Slightly
  *c	Vibrate Slightly

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the IGCT NO. 1 relay and INV W/PMP relay.

Result: 

NG 

See step  18

Result: 

OK 

See step  12

Pre-procedure1

• Remove the INV W/PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  3 - 5	Auxiliary battery voltage not applied between terminals 1 and 2	10 kΩ or higher	kΩ
  3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω	Ω

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	INV W/PMP Relay

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the INV W/PMP relay.

Result: 

NG 

See step  20

Result: 

OK 

See step  13

Pre-procedure1

• Disconnect the inverter water pump assembly connector.
• Turn the ignition switch to ON.

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

  Standard Voltage

  Tester Connection	Condition	Specified Condition	Result
  A42-4 (+BWP) - Body ground	Ignition switch ON	11 to 14 V	V

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *a	Example
  *b	Shake Slightly
  *c	Vibrate Slightly

  NOTE:

  • If the ignition switch is turned to ON with the connectors disconnected, other DTCs will be stored. Be sure to clear the DTCs after the inspection.
  • Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.

  HINT: 

  • Connectors

    Slightly shake the connector vertically and horizontally.

  • Wire Harness

    Slightly shake the wire harness vertically and horizontally.

    The connector joint and fulcrum of the vibration are the major areas that should be checked thoroughly.

  • No. 1 Engine Room Relay Block and No. 1 Junction Block Assembly

    Apply slight vibration with a finger to the No. 1 engine room relay block and No. 1 junction block assembly and check whether a malfunction occurs.

  • INV W/PMP NO. 2 fuse

    Apply slight vibration with a finger to the INV W/PMP NO. 2 fuse and check whether a malfunction occurs.

  • INV W/PMP Relay

    Apply slight vibration with a finger to the INV W/PMP relay and check whether a malfunction occurs.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Turn the ignition switch off.
• Reconnect the inverter water pump assembly connector.

Result: 

NG 

See step  21

Result: 

OK 

See step  14

Pre-procedure1

• Disconnect the inverter water pump assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A42-1 (GND) - Body ground	Ignition switch off	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the inverter water pump assembly connector.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  15

HINT: 

Refer to REMOVAL [10/2022 - ]

Result

Result: 

NEXT 

See step  16

1. After replacing the inverter water pump with motor assembly, add HV coolant and perform air bleeding.

   HINT: 

   Refer to REPLACEMENT [10/2022 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END 

Pre-procedure1

• Remove the INV W/PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  3 - 5	Auxiliary battery voltage not applied between terminals 1 and 2	10 kΩ or higher	kΩ
  3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω	Ω

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	INV W/PMP Relay

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the INV W/PMP relay.

Result: 

OK 

CONNECT SECURELY (INV W/PMP RELAY) 

Result: 

NG 

REPLACE RELAY (INV W/PMP) 

1. Check installation condition of the INV W/PMP NO. 1 fuse.

   OK

   INV W/PMP NO. 1 fuse is installed correctly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  25

Result: 

OK 

See step  19

Pre-procedure1

• Remove the INV W/PMP NO. 1 fuse from the No. 2 engine room relay block and No. 2 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  INV W/PMP No. 1 fuse	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the INV W/PMP No. 1 fuse.

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/PMP NO. 1 FUSE HOLDER TERMINAL) 

Result: 

NG 

See step  26

1. Check the terminals of the INV W/PMP relay holder.

   OK

   The terminals of the INV W/PMP relay holder are not bent, loose or corroded.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE RELAY (INV W/PMP) 

Result: 

NG 

See step  27

1. Check installation condition of the INV W/PMP NO. 2 fuse.

   OK

   INV W/PMP NO. 2 fuse is installed correctly.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

CONNECT SECURELY (INV W/PMP NO. 2 FUSE) 

Result: 

OK 

See step  22

Pre-procedure1

• Remove the INV W/PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  3 - 5	Auxiliary battery voltage not applied between terminals 1 and 2	10 kΩ or higher	kΩ
  3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω	Ω

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	INV W/PMP Relay

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the INV W/PMP relay.

Result: 

NG 

See step  32

Result: 

OK 

See step  23

Pre-procedure1

• Remove the INV W/PMP NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly.
• Remove the INV W/PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.
• Disconnect the inverter water pump assembly connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  A42-4 (+BWP) - 3 (INV W/PMP relay holder)	Ignition switch off	Below 1 Ω	Ω
  2 (INV W/PMP NO. 2 fuse holder) - 5 (INV W/PMP relay holder)	Ignition switch off	Below 1 Ω	Ω
  3 (INV W/PMP relay holder) or A42-4 (+BWP) - Body ground and other terminals	Ignition switch off	10 kΩ or higher	kΩ

  NOTE:

  Do not apply excessive force when using the probes of the tester to perform the inspection. If excessive force is used, the terminals will be damaged.

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Reconnect the inverter water pump assembly connector.
• Install the INV W/PMP relay and INV W/PMP NO. 2 fuse.

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  24

Pre-procedure1

• Remove the INV W/PMP NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  INV W/PMP NO. 2 fuse	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the INV W/PMP NO. 2 fuse.

Result: 

OK 

REPAIR OR REPLACE HARNESS OR CONNECTOR (INV W/PMP NO. 2 FUSE HOLDER TERMINAL OR INV W/PMP RELAY HOLDER TERMINAL) 

Result: 

NG 

See step  28

Pre-procedure1

• Remove the INV W/PMP relay from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  3 - 5	Auxiliary battery voltage not applied between terminals 1 and 2	10 kΩ or higher	kΩ
  3 - 5	Auxiliary battery voltage applied between terminals 1 and 2	Below 1 Ω	Ω

  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

  *1	INV W/PMP Relay

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the INV W/PMP relay.

Result: 

OK 

CONNECT SECURELY (INV W/PMP NO. 1 FUSE) 

Result: 

NG 

See step  30

1. Check the terminals of the INV W/PMP relay holder.

   OK

   The terminals of the INV W/PMP relay holder are not bent, loose or corroded.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE FUSE (INV W/PMP NO. 1) 

Result: 

NG 

See step  31

1. Repair or replace the terminals of the INV W/PMP relay holder.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

REPLACE RELAY (INV W/PMP) 

HINT: 

Refer to REMOVAL [10/2022 - ]

Result

Result: 

NEXT 

See step  29

1. After replacing the inverter water pump with motor assembly, add HV coolant and perform air bleeding.

   HINT: 

   Refer to REPLACEMENT [10/2022 - ]

   Result

   Proceed to
   NEXT

Result: 

NEXT 

END 

Result

Result: 

NEXT 

CONNECT SECURELY (INV W/PMP NO. 1 FUSE) 

1. Repair or replace the terminals of the INV W/PMP relay holder.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

REPLACE FUSE (INV W/PMP NO. 1) 

1. Check the terminals of the INV W/PMP relay holder.

   OK

   The terminals of the INV W/PMP relay holder are not bent, loose or corroded.

   Result

   Proceed to
   OK
   NG

Result: 

NG 

See step  34

Result: 

OK 

See step  33

Pre-procedure1

• Remove the INV W/PMP NO. 2 fuse No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  INV W/PMP NO. 2 fuse	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the INV W/PMP NO. 2 fuse.

Result: 

OK 

REPLACE RELAY (INV W/PMP) 

Result: 

NG 

See step  36

Pre-procedure1

• Remove the INV W/PMP NO. 2 fuse from the No. 1 engine room relay block and No. 1 junction block assembly.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  INV W/PMP NO. 2 fuse	Always	Below 1 Ω	Ω

  Result

  Proceed to
  OK
  NG

Post-procedure1

• Install the INV W/PMP NO. 2 fuse.

Result: 

NG 

See step  37

Result: 

OK 

See step  35

1. Repair or replace the terminals of the INV W/PMP relay holder.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

REPLACE RELAY (INV W/PMP) 

Result

Result: 

NEXT 

REPLACE FUSE (INV W/PMP NO. 2) 

1. Repair or replace the terminals of the INV W/PMP relay holder.

   Result

   Proceed to
   NEXT

Result: 

NEXT 

See step  38

Result

Result: 

NEXT 

REPLACE FUSE (INV W/PMP NO. 2)