Power Meter Gauge Malfunction: Procedure

1. Connect the Techstream to the DLC3.
2. Turn the power switch on (IG).
3. Turn the tester ON.
4. Enter following menus: Body Electrical / Combination Meter / Active Test.
5. Check the operation by referring to the table below.
   COMBINATION METER:
   
   

   Tester Display	Test Part	Control Range	Diagnostic Note
   Power Meter Operation	Power meter	-50 / 50 / 100 / 150 / 200 / 250 kW	-

   OK

   Needle indication is normal.

6. Check the input signal waveform.
   1. Disconnect the K31 meter connector.
   2. Connect the oscilloscope to the terminals PMET and body ground.
   3. Start the engine.
   4. Check the signal waveform according to the condition(s) in the table below.

      Item	Condition
      Tool setting	5 V/DIV., 50 ms./DIV.
      Vehicle condition	Turn the power switch to the ON (IG) position.

NG → REPLACE COMBINATION METER 

OK: Go to next step 

Fig 1: Identifying K31 Meter Connector Terminals And Signal Waveform

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K31 meter connector.
2. Connect the oscilloscope to the terminals PMET and body ground.
3. Start the engine.
4. Check the signal waveform according to the condition(s) in the table below.

   Item	Condition
   Tool setting	5 V/DIV., 50 msc./DIV.
   Vehicle condition	Turn the power switch to the ON (IG) position.

NG → REPLACE COMBINATION METER 

OK: Go to next step 

Fig 2: Identifying K31 Meter And A54 ECU Connector Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the K31 meter connector.
2. Disconnect the A54 ECU connector.
3. Measure the resistance of the wire harness side connector.

   Standard resistance

   Tester Connection	Specified Condition
   K31-27 (PMT1) - A54-78 (PMET)	Below 1 Ω
   K31-27 (PMT1) - Body ground	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK → REPLACE HYBRID VEHICLE CONTROL ECU