Inspection Procedure

HINT:

• If DTCs related to a different system that have terminal E2 as the ground terminal are output simultaneously, terminal E2 may have an open circuit.
• Read freeze frame data using the hand-held tester or the OBD II scan tool. Freeze frame data records the engine conditions when a malfunction is detected. When troubleshooting, freeze frame data can help determine if the vehicle was running or stopped, 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.

Hand-held tester: 

1. Connect hand-held tester, and read throttle valve opening percentage. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn the ignition switch to ON and turn the hand-held tester ON.

   CHECK: 

   Read the throttle valve opening angle (percentage) for the VTA circuit and read the voltage for the VTA2 circuit.

   OK: 

   VALVE OPENING POSITION
   
   

   Accelerator pedal	Throttle valve opening angle expressed as percentage (VTA)	Voltage (VTA2)
   Released	8 to 20 %	2.0 to 2.9 V
   Depressed	64 to 96 %	4.7 to 5.1 V

   Fig 1: Identifying Accelerator Pedal Positions

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG : Go To Next Step. 
2. Check throttle position sensor (See  INSPECTION  ). 
   1. NG : Replace throttle position sensor (See  INSTALLATION  ). 
   2. OK : Go To Next Step 
3. Check voltage between terminals VC and E2 of ECM connector. 

   PREPARATION: 

   1. Remove the ECM cover.
   2. Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminals VC and E2 of ECM connector.

   OK: 

   1. Voltage: 4.5 to 5.5 V 
   Fig 2: Locating ECM VC & E2 Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. OK : Go To Next Step 
4. Check voltage between terminals VTA and E2, and VTA2 and E2 of ECM connector. 

   PREPARATION: 

   1. Remove the ECM cover.
   2. Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminals VTA and E2, and VTA2 and E2 of ECM connector.

   OK: 

   Fig 3: Checking Voltage Between ECM Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 4: Locating ECM VTA, VTA2 & E2 Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG : Check for open and short in harness and connectors in VC, VTA, VTA and E2 circuits between ECM and throttle position sensor (See  PROCEDURE  ).  

OBD II scan tool (excluding hand-held tester): 

1. Check throttle position sensor (See  INSPECTION  ). 
   1. NG : Replace throttle position sensor (See  INSTALLATION  ). 
   2. OK : Go To Next Step 
2. Check voltage between terminals VC and E2 of ECM connector. 

   PREPARATION: 

   1. Remove the ECM cover.
   2. Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminals VC and E2 of ECM connector.

   OK: 

   1. Voltage: 4.5 to 5.5 V 
   Fig 5: Locating ECM VC & E2 Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. NG : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. OK : Go To Next Step 
3. Check voltage between terminals VTA and E2, and VTA2 and E2 of ECM connector. 

   PREPARATION: 

   1. Remove the ECM cover.
   2. Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminals VTA and E2, and VTA2 and E2 of ECM connector.

   OK: 

   Fig 6: Checking Voltage Between ECM Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 7: Locating ECM VTA, VTA2 & E2 Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG : Check for open and short in harness and connectors in VC, VTA, VTA and E2 circuits between ECM and throttle position sensor (See  PROCEDURE  ).