DTC P16B3-19: Multi Flow Control Valve Motor Circuit Current Above Threshold [10/2022 - ]: Procedure

1. Inspect the water control valve.

   Refer to INSPECTION [10/2022 - ]

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPLACE WATER CONTROL VALVE. Refer to  REMOVAL [10/2022 - ] 

Result: 

OK 

See step  2

1. Disconnect the water control valve connector.
2. Disconnect the ECM connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   C73-5 (FCM+) or C88-3 (FCM+) - Other terminals	Always	10 kΩ or higher
   C73-4 (FCM-) or C88-4 (FCM-) - Other terminals	Always	10 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

1. Disconnect the water control valve connector.
2. Inspect the ECM using an oscilloscope.
3. Turn the ignition switch to ON.
4. While the ignition switch to ON, check the waveform the terminals of the water control valve connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a

   Front view of wire harness connector (to Water Control Valve)

   *b

   Waveform of FCM+ terminal and FCM- terminal during fail-safe

   ECM Terminal Name	C73-5 (FCM+) - C73-4 (FCM-)
   Tester Range	2 V/DIV., 1 ms./DIV.
   Condition	Ignition switch ON

5. While the ignition switch to ON, check the waveform between the FCM+ terminal and FCM- terminal during fail-safe.

   Standard

   25% duty waveform is output

   HINT: 

   • Check the operation circuit of the ECM by checking the waveform during fail-safe.
   • Because fail-safe is prohibited when the ambient temperature is 0°C (32°F) or less, work in a location where the ambient temperature is 5°C (41°F) or higher.
   • DTCs may be stored during this inspection. Check for DTCs and clear them using the GTS.

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE WATER CONTROL VALVE. Refer to  REMOVAL [10/2022 - ] 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [10/2022 - 11/2023]  , or refer to  REMOVAL [11/2023 - ]