Hand-held tester

1. Connect the hand-held tester or the OBD II scan tool to the DLC3.
2. Turn the power switch ON (IG).
3. Turn the hand-held tester ON.
4. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / DTC INFO / CURRENT CODES.
5. Read DTCs using the hand-held tester or the OBD II scan tool.

Result: 

HINT:

If any other codes besides P2601 are output, perform troubleshooting for those DTCs first.

B: GO TO RELEVANT DTC CHART (See  DIAGNOSTIC TROUBLE CODE CHART   ) 

A: Go To Next Step 

1. Connect the hand-held tester to the DLC3.
2. Turn the power switch ON (IG).
3. Turn the hand-held tester ON.
4. On the hand-held tester, select the item: DIAGNOSIS / ENHANCED OBD II / ACTIVE TEST / WATER PUMP.
5. Check that the CHS W/P relay operates and the operating sounds of the water pump occurs.

Standard: 

NG: Go to step   5 

OK: Go To Next Step 

Fig 1: Measuring Resistance Between Terminals Temperature Sensor

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the coolant heat storage (CHS) tank outlet temperature sensor.
2. Measure the resistance between the terminals.

   Standard: 

   RESISTANCE TESTING
   
   

   Tester Connection	Specified Condition
   1 - 2	2 to 3 kΩ at 20°C (68°F)
   1 - 2	0.2 to 0.4 kΩ at 80°C (176°F)

   NOTE: In case of checking the CHS tank outlet temperature sensor in the water, be careful not to allow water to contact the terminals. After checking, dry the sensor.

   HINT:

   Alternate procedure: Connect an ohmmeter to the installed CHS tank outlet temperature sensor and read the resistance. Use an infrared thermometer to measure the CHS tank outlet temperature in the immediate vicinity of the sensor. Compare these values to the resistance/temperature graph. Change the engine coolant temperature (warm up or allow to cool down) and repeat the test.

3. Reinstall the CHS tank outlet temperature sensor.

NG: REPLACE TEMPERATURE SENSOR 

OK: Go To Next Step 

Fig 2: Identifying CHS Tank Outlet Temperature Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the harness and the connectors between the CHS tank outlet temperature sensor connector and the ECM connector.
   1. Disconnect the C19 CHS tank outlet temperature sensor connector.
   2. Disconnect the E5 and E7 ECM connectors.
   3. Check the resistance between the wire harness side connectors.

      Standard (Check for open): 

      RESISTANCE MEASURING
      
      

      Tester Connection	Specified Condition
      CHS tank outlet temperature sensor (C19-2) - THW2 (E7-33)	Below 1 Ω
      CHS tank outlet temperature sensor (E2-1) - E2 (E4-28)	Below 1 Ω

      Fig 3: Disconnecting ECM Connector - E4 - E7

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      RESISTANCE MEASURING
      
      

      Tester Connection	Specified Condition
      CHS tank outlet temperature sensor (C19-2) or THW2 (E7-33)- Body ground	10 kΩ or higher

   4. Reconnect the CHS tank outlet temperature sensor connector.
   5. Reconnect the ECM connectors.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM (See  ENGINE CONTROL SYSTEM  ) 

Fig 4: Circuit Diagram CHS Water Pump Relay

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Remove the CHS W/P relay from the engine room R/B No.2.
2. Inspect the CHS W/P relay.

   Standard: 

   RESISTANCE MEASURING
   
   

   Tester Connection	Specified Condition
   3-5	10 kΩ or higher
   3 - 5	Below 1 Ω (Apply battery voltage to terminals 1 and 2)

3. Reinstall the CHS W/P relay.

NG: REPLACE CHS W/P RELAY 

OK: Go To Next Step 

Fig 5: Identifying CHS Water Pump Connector (Front View)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the C20 CHS water pump connector.
2. Measure the resistance between the terminals of the water pump.

   Standard: 

   RESISTANCE MEASURING
   
   

   Tester Connection	Specified Condition
   1 - 2	0.3 to 100 Ω

3. Reconnect the CHS water pump connector.

NG: REPLACE WATER W/MOTOR & BRACKET PUMP ASSY 

OK: Go To Next Step 

Fig 6: Identifying CHS Water Pump Connector (Wire Harness Side)

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Check the harness and the connectors between the CHS water pump connector and the ECM connector.
   1. Remove the CHS W/P relay from the engine room R/B No.2.
   2. Disconnect the E7 ECM connector.
   3. Check the resistance between the wire harness side connectors.

      Standard (Check for open): 

      RESISTANCE MEASURING
      
      

      Tester Connection	Specified Condition
      WPL (E7-15) - CHS W/P relay (2)	Below 1 Ω

      Fig 7: Disconnecting E7 ECM Connector

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      RESISTANCE MEASURING
      
      

      Tester Connection	Specified Condition
      CHS W/P relay (2) or WPL (E7-15) - Body ground	10 kΩ or higher

   4. Reinstall the integration relay.
   5. Reconnect the ECM connector.
2. Check the harness and the connectors between the CHS water pump connector and the CHS W/P relay.
   1. Disconnect the CHS water pump connector.
   2. Remove the CHS W/P relay from the engine room R/B No.2.
   3. Check the resistance between the wire harness side connectors.

      Standard (Check for open): 

      RESISTANCE MEASURING (DTC P2601)
      
      

      Tester Connection	Specified Condition
      CHS water pump (2) - CHS W/P relay (5)	Below 1 Ω
      CHS water pump (1) - Body ground	Below 1 Ω

      Fig 8: Locating CHS Water Pump Relay

      Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Standard (Check for short): 

      RESISTANCE MEASURING (DTC P2601)
      
      

      Tester Connection	Specified Condition
      CHS water pump (2) or CHS W/P relay (5) - Body ground	10 kΩ or higher

   4. Reconnect the CHS water pump connector.
   5. Reinstall the integration relay.

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: REPLACE ECM (See  ENGINE CONTROL SYSTEM  )