Inspection Procedure

HINT:

• If other DTCs relating to different systems that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
• Read freeze frame data using the intelligent tester. The ECM (Included in HV control ECU) records vehicle and driving condition information as freeze frame data the moment a DTC is stored. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air-fuel ratio was lean or rich, and other data, from the time the malfunction occurred.

1. READ VALUE USING INTELLIGENT TESTER (INTAKE AIR TEMPERATURE) 
   1. Connect the intelligent tester to the DLC3.
   2. Turn the ignition switch to the ON position.
   3. Turn the tester ON.
   4. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   5. Read the value displayed on the tester.

   Standard: 

   Same as actual Intake Air Temperature (IAT). 

   Result 

   RESULT REFERENCE
   
   

   Temperature Displayed	Proceed to
   -40°C (-40°F)	A
   140°C (284°F) or higher	B
   Same as actual IAT	C

   HINT:

   • If there is an open circuit, the intelligent tester indicates 40°C (-40°F).
   • If there is a short circuit, the intelligent tester indicates 140°C (284°F) or higher.

   B: GO TO step   4 

   C: CHECK FOR INTERMITTENT PROBLEMS 

   A: Go to next step 

2. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN WIRE HARNESS) 
   1. Disconnect the M1 Mass Air Flow (MAF) meter connector.
   2. Connect terminals THA and E2 of the MAF meter wire harness side connector.
   3. Connect the intelligent tester to the DLC3.
   4. Turn the ignition switch to the ON position.
   5. Turn the tester ON.
   6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   7. Read the value displayed on the tester.

      Standard: 

      140°C (284°F) or higher 

   8. Reconnect the MAF meter connector.

   OK: CONFIRM GOOD CONNECTION TO SENSOR. IF OK, REPLACE MASS AIR FLOW METER 

   Fig 1: Identifying MAF Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to next step 

3. READ VALUE USING INTELLIGENT TESTER (CHECK FOR OPEN IN HV CONTROL ECU) 
   1. Disconnect the M1 MAF meter connector.
   2. Connect terminals THA and E2 of the H32 HV control ECU connector.

      HINT:

      Before checking, do visual and contact pressure checks on the HV control ECU connector.

   3. Connect the intelligent tester to the DLC3.
   4. Turn the ignition switch to the ON position.
   5. Turn the tester ON.
   6. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   7. Read the value displayed on the tester.

      Standard: 

      140°C (284°F) or higher 

   8. Reconnect the MAF meter connector.

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 2: Identifying MAF Meter Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: CONFIRM GOOD CONNECTION TO HV CONTROL ECU. IF OK, REPLACE HV CONTROL ECU 

4. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN WIRE HARNESS) 
   1. Disconnect the M1 MAF meter connector.
   2. Connect the intelligent tester to the DLC3.
   3. Turn the ignition switch to the ON position.
   4. Turn the tester ON.
   5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   6. Read the value displayed on the tester.

      Standard: 

      -40°C (-40°F) or higher 

   7. Reconnect the MAF meter connector.

   OK: REPLACE MASS AIR FLOW METER 

   Fig 3: Checking Short In Wire Harness)

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: Go to next step 

5. READ VALUE USING INTELLIGENT TESTER (CHECK FOR SHORT IN HV CONTROL ECU) 
   1. Disconnect the H32 HV control ECU connector.
   2. Connect the intelligent tester to the DLC3.
   3. Turn the ignition switch to the ON position.
   4. Turn the tester ON.
   5. Enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / PRIMARY / INTAKE AIR.
   6. Read the value displayed on the tester.

      Standard: 

      -40°C (-40°F) or higher 

   7. Reconnect the HV control ECU connector.

   OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 

   Fig 4: Identifying H32 HV Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPLACE HV CONTROL ECU