DTC P314A-828: Inverter Coolant Pump Speed Signal [12/2014 - ]: Procedure

NEXT: Go to next step 

HINT: 

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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
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 and check that it is operating (vibrating).

   OK

   The inverter water pump is operating (vibrating).

6. Turn the ignition switch off.

NG → See step   9 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

NG → CONNECT SECURELY 

OK: Go to next step 

1. Disconnect connector A38 from the hybrid vehicle control ECU.
2. Disconnect connector A53 from the inverter water pump assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *a

   Rear view of wire harness connector (to Hybrid Vehicle Control ECU)

   *b

   Front view of wire harness connector (to Inverter Water Pump Assembly)

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A38-14 (NIWP) - A53-2 (NWP)	Ignition switch off	Below 1 Ω
   A38-14 (NIWP) or A53-2 (NWP) -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 connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect connector A53 from the inverter water pump assembly.
2. Turn the ignition switch to ON (IG).
3. Measure the voltage according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   A38-14 (NIWP) - G57-6 (E1)	Ignition switch ON (IG)	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 connector.

NG → See step   27 

OK: Go to next step 

NEXT: Go to next step 

HINT: 

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

1. Connect the Techstream to the DLC3.
2. Turn the ignition switch to ON (IG).
3. Enter the following menus: Powertrain / Hybrid Control / Active Test / Activate the Water Pump.
4. Perform the "Activate the Water Pump" Active Test.
5. 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

   Item	Content
   Terminal	A38-14 (NIWP) - G57-6 (E1)
   Equipment Setting	5 V/DIV., 100 ms./DIV.
   Condition	Ignition switch ON (IG), during Active Test

   OK

   The duration of wavelength A is 300 msec or less.

   TEXT IN ILLUSTRATION
   
   

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

6. Turn the ignition switch off.

NG → See step   26 

OK → See step   27 

NG → See step   12 

OK: Go to next step 

1. Remove the IGCT relay from the No. 2 engine room relay block and No. 2 junction block assembly.
2. Disconnect connector A53 from the inverter water pump assembly.
3. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly	*2	IGCT Relay
   *a	Front view of wire harness connector (to Inverter Water Pump Assembly)	-	-

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A53-4 (+BWP) - 5 (IGCT relay)	Ignition switch off	Below 1 Ω

   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. 2 Engine Room Relay Block and No. 2 Junction Block Assembly

     Apply slight vibration with a finger to the No. 2 engine room relay block and No. 2 junction block assembly and check whether a malfunction occurs.

   • IGCT NO. 3 Fuse

     Apply slight vibration with a finger to the IGCT NO. 3 fuse and check whether a malfunction occurs.

     Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

     TEXT IN ILLUSTRATION
     
     

     *a	Example
     *b	Shake Slightly
     *c	Vibrate Slightly

   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 IGCT relay.
5. Connect the inverter water pump assembly connector.

NG → See step   13 

OK: Go to next step 

1. Disconnect connector A53 from the inverter water pump assembly.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A53-1 (GND) - Body ground	Ignition switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

3. Connect the inverter water pump assembly connector.

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → See step   26 

1. Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block and No. 2 junction block assembly.

   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
   IGCT NO. 3 fuse	Always	Below 1Ω

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
   *2	IGCT NO. 3 Fuse

3. Install the IGCT NO. 3 fuse.

NG → See step   23 

OK → CONNECT SECURELY (INVERTER WATER PUMP ASSEMBLY CONNECTOR) 

1. Check the terminals of the IGCT NO. 3 fuse holder.

   OK

   The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded.

NG → See step   16 

OK: Go to next step 

1. Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block and No. 2 junction block assembly.
2. Remove the IGCT relay from the No. 2 engine room relay block and No. 2 junction block assembly.
3. Disconnect connector A53 from the inverter water pump assembly.
4. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly	*2	IGCT NO. 3 Fuse
   *3	IGCT Relay	-	-
   *a	Front view of wire harness connector (to Inverter Water Pump Assembly)	-	-

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A53-4 (+BWP) - 2 (IGCT NO. 3 fuse)	Ignition switch off	Below 1 Ω
   1 (IGCT NO. 3 fuse) - 5 (IGCT relay)	Ignition switch off	Below 1 Ω
   A53-4 (+BWP) or 2 (IGCT NO. 3 fuse) - Body ground and other terminals	Ignition switch off	10 kΩ or higher
   1 (IGCT NO. 3 fuse) or 5 (IGCT relay) - Body ground and other terminals	Ignition switch off	10 kΩ or higher

   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.

5. Install the IGCT NO. 3 fuse.
6. Install the IGCT relay.
7. Connect the inverter water pump assembly connector.

NG → See step   18 

OK: Go to next step 

1. Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block and No. 2 junction block assembly.

   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
   IGCT NO. 3 fuse	Always	Below 1Ω

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
   *2	IGCT NO. 3 Fuse

3. Install the IGCT NO. 3 fuse.

NG → See step   19 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Check the terminals of the IGCT NO. 3 fuse holder.

   OK

   The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded.

NG → See step   22 

OK: Go to next step 

1. Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block and No. 2 junction block assembly.

   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
   IGCT NO. 3 fuse	Always	Below 1Ω

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
   *2	IGCT NO. 3 Fuse

3. Install the IGCT NO. 3 fuse.

NG → REPLACE FUSE (IGCT NO. 3) 

OK → CONNECT SECURELY (IGCT NO. 3 FUSE) 

1. Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block and No. 2 junction block assembly.

   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
   IGCT NO. 3 fuse	Always	Below 1Ω

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
   *2	IGCT NO. 3 Fuse

3. Install the IGCT NO. 3 fuse.

NG → See step   24 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR 

1. Disconnect connector A53 from the inverter water pump assembly.
2. Measure the resistance according to the value(s) in the table below.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   Standard Resistance

   Tester Connection	Switch Condition	Specified Condition
   A53-1 (GND) - Body ground	Ignition switch off	10 kΩ or higher

   TEXT IN ILLUSTRATION
   
   

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

3. Connect the inverter water pump assembly connector.

NG → See step   24 

OK: Go to next step 

1. Check the terminals of the IGCT NO. 3 fuse holder.

   OK

   The terminals of the IGCT NO. 3 fuse holder are not bent, loose or corroded.

NG → See step   25 

OK: Go to next step 

Refer to COMPONENTS [12/2014 - ]

NEXT → REPLACE FUSE (IGCT NO. 3) 

1. Remove the IGCT NO. 3 fuse from the No. 2 engine room relay block and No. 2 junction block assembly.

   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
   IGCT NO. 3 fuse	Always	Below 1Ω

   TEXT IN ILLUSTRATION
   
   

   *1	No. 2 Engine Room Relay Block and No. 2 Junction Block Assembly
   *2	IGCT NO. 3 Fuse

3. Install the IGCT NO. 3 fuse.

NG → See step   25 

OK → REPAIR OR REPLACE HARNESS OR CONNECTOR (IGCT NO. 3 FUSE HOLDER TERMINAL) 

1. Connect the inverter water pump assembly connector securely.

NEXT → REPLACE FUSE (IGCT NO. 3) 

NEXT → REPLACE FUSE (IGCT NO. 3) 

NEXT → REPLACE FUSE (IGCT NO. 3)