DTC P16B3-19: Multi Flow Control Valve Motor Circuit Current Above Threshold [09/2023 - ]: Procedure

Refer to INSPECTION [09/2023 - ]

Result

Result: 

NG 

REPLACE WATER CONTROL VALVE. Refer to  REMOVAL [09/2023 - ] 

Result: 

OK 

See step  2

Pre-procedure1

• Disconnect the water control valve connector.
• Disconnect the ECM connector.

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

  Standard Resistance

  Tester Connection	Condition	Specified Condition	Result
  C39-5 (FCM+) or C26-3 (FCM+) - Other terminals	Always	10 kΩ or higher	kΩ
  C39-4 (FCM-) or C26-4 (FCM-) - Other terminals	Always	10 kΩ or higher	kΩ

  Result

  Proceed to
  OK
  NG

Post-procedure1

• None

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

OK 

See step  3

Pre-procedure1

• Disconnect the water control valve connector.
• Inspect the ECM using an oscilloscope.
• Turn the ignition switch to ON.
• Connect an oscilloscope between the terminals of the water control valve.

  ECM Terminal Name	C39-5 (FCM+) - C39-4 (FCM-)
  Tester Range	2 V/DIV., 1 ms./DIV.
  Condition	Ignition switch ON

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

  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

  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

Post-procedure1

• None

Result: 

OK 

REPLACE WATER CONTROL VALVE. Refer to  REMOVAL [09/2023 - ] 

Result: 

NG 

REPLACE ECM. Refer to  REMOVAL [09/2023 - ]