DTC P314A-828: Inverter Coolant Pump Speed Signal: Procedure

HINT: 

When the auxiliary battery voltage is low, the inverter water pump assembly (w/ motor) may not operate.

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON.
3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
4. Perform the Activate the Water Pump Active Test.
5. Touch the inverter water pump assembly (w/ motor) and check that it is operating (vibrating).

   OK

   The inverter water pump assembly (w/ motor) is operating (vibrating).

6. Turn the ignition switch off.

NG → See step   6 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect connector A65 from the hybrid vehicle control ECU.
2. Disconnect connector A52 from the inverter water pump assembly (w/ motor).
3. Measure the resistance according to the value(s) in the table below.
   Fig 1: Checking Harness And Connector (Hybrid Vehicle Control ECU - Inverter Water Pump Assembly (W/ Motor))

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   TEXT IN ILLUSTRATION
   
   

   *a	Front view of wire harness connector (to Inverter Water Pump Assembly (w/ Motor))
   *b	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A52-2 (NWP) - A65-14 (NIWP)	Ignition switch off	Below 1 Ω
   A52-3 (SWP) - A65-13 (IWP)	Ignition switch off	Below 1 Ω
   A52-2 (NWP) or A65-14 (NIWP) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
   A52-3 (SWP) or A65-13 (IWP) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

4. Connect the hybrid vehicle control ECU connector.
5. Connect the inverter water pump assembly (w/ motor) connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect connector A52 from the inverter water pump assembly (w/ motor).
2. Turn the ignition switch to ON.
3. Measure the voltage according to the value(s) in the table below.
   Fig 2: Checking Hybrid Vehicle Control ECU

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A65-14 (NIWP) - D72-6 (E1)	Ignition switch ON	11 to 14 V

   TEXT IN ILLUSTRATION
   
   

   *a	Component with harness connected (Hybrid Vehicle Control ECU)

4. Turn the ignition switch off.
5. Connect the inverter water pump assembly (w/ motor) connector.

NG → See step   15 

OK → See step   14 

1. Remove the INV W/P fuse from the engine room relay block No. 2.
   Fig 3: Identifying INV W/P Fuse

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   INV W/P fuse	Always	Below 1 Ω

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block No. 2
   *2	INV W/P Fuse

3. Install the INV W/P fuse.

NG → See step   9 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Remove the INV W/P fuse from the engine room relay block No. 2.
2. Remove the IGCT MAIN relay from the engine room relay block No. 2.
3. Disconnect connector A65 from the hybrid vehicle control ECU.
4. Disconnect connector A52 from the inverter water pump assembly (w/ motor).
5. Measure the resistance according to the value(s) in the table below.
   Fig 4: Checking Harness And Connector (Inverter Water Pump Assembly (W/ Motor) Circuit)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   2 (INV W/P fuse) - A52-4 (+BWP)	Ignition switch off	Below 1 Ω
   1 (INV W/P fuse) - 3 (IGCT MAIN relay)	Ignition switch off	Below 1 Ω
   A52-1 (GND) - Body ground	Ignition switch off	Below 1 Ω
   A52-2 (NWP) - A65-14 (NIWP)	Ignition switch off	Below 1 Ω
   A52-3 (SWP) - A65-13 (IWP)	Ignition switch off	Below 1 Ω
   2 (INV W/P fuse) or A52-4 (+BWP) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
   1 (INV W/P fuse) or 3 (IGCT MAIN relay) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
   A52-2 (NWP) or A65-14 (NIWP) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
   A52-3 (SWP) or A65-13 (IWP) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block No. 2
   *2	IGCT MAIN Relay
   *3	INV W/P Fuse
   *a	Front view of wire harness connector (to Inverter Water Pump Assembly (w/ Motor))
   *b	Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

   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.

6. Install the INV W/P fuse.
7. Install the IGCT MAIN relay.
8. Connect the hybrid vehicle control ECU connector.
9. Connect the inverter water pump assembly (w/ motor) connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   14 

NG → See step   12 

OK: Go to next step 

1. Remove the INV W/P fuse from the engine room relay block No. 2.
2. Disconnect connector A52 from the inverter water pump assembly (w/ motor).
3. Measure the resistance according to the value(s) in the table below.
   Fig 5: Checking Harness And Connector (Inverter Water Pump Assembly (W/ Motor) Circuit)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   2 (INV W/P fuse) or A52-4 (+BWP) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

   *1	Engine Room Relay Block No. 2
   *2	INV W/P Fuse
   *a	Front view of wire harness connector (to Inverter Water Pump Assembly (w/ Motor))

   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.

4. Install the INV W/P fuse.
5. Connect the inverter water pump assembly (w/ motor) connector.

NG → See step   13 

OK: Go to next step 

1. Replace the inverter water pump assembly (w/ motor). Refer to REMOVAL .

NEXT → REPLACE FUSE (INV W/P) 

1. Connect the inverter water pump assembly (w/ motor) connector securely.

NEXT → REPLACE FUSE (INV W/P) 

1. Repair or replace the wire harness or connector.

NEXT → REPLACE FUSE (INV W/P)