Inspection Procedure

HINT:

• If DTCs related 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 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 the voltage for accelerator pedal position sensor data. 

   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 voltage for the accelerator pedal position sensor data.

   OK: 

   Table Accelerator Pedal Position Voltage Table
   
   

   Accelerator Pedal	VPA	VPA2
   Released	0.3 to 0.9 V	1.8 to 2.7 V
   Depressed	3.2 to 4.8 V	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 accelerator pedal position sensor (See  THROTTLE BODY (SMT)  ). 
   1. NG : Replace accelerator pedal position sensor (See  REPLACEMENT  ). 
   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 Connector Terminals VC & E2

   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 VPA and E2, and VPA2 and E2 of ECM connectors. 

   PREPARATION: 

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

   CHECK: 

   Measure the voltage between terminals VPA and E2, and VPA2 and E2 of ECM connectors.

   OK: 

   Fig 3: Accelerator Pedal Position Voltage Table

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 4: Locating ECM Connector Terminals VPA, VPA2 & E2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG : Go to Next Step 
5. Check for open and short in harness and connector in VC, VPA, VPA2 and E2 circuits between ECM and accelerator pedal position sensor (See  PROCEDURE  ). 
   1. NG : Repair or replace harness nad connector. 
   2. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 

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

1. Check accelerator pedal position sensor (See  THROTTLE BODY (SMT)  ). 
   1. NG : Replace accelerator pedal position sensor (See  REPLACEMENT  ). 
   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 Connector Terminals VC & E2

   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 VPA and E2, and VPA2 and E2 of ECM connectors. 

   PREPARATION: 

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

   CHECK: 

   Measure the voltage between terminals VPA and E2, and VPA2 and E2 of ECM connectors.

   OK: 

   Fig 6: Accelerator Pedal Position Voltage Table

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 7: Locating ECM Connector Terminals VPA, VPA2 & E2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG : Go to Next Step 
4. Check for open and short in harness and connector in VC, VPA, VPA2 and E2 circuits between ECM and accelerator pedal position sensor (See  PROCEDURE  ). 
   1. NG : Repair or replace harness and connector. 
   2. OK : Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ).