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 a hand-held tester or OBD II scan tool. Freeze frame data record the engine condition when malfunctions are detected. 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.

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: 

   ACCELERATOR PEDAL VOLTAGE SPECIFICATION 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: Depressing And Releasing Accelerator Pedal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   • NG: Go to next step. 
2. Check accelerator pedal position sensor (See  THROTTLE BODY (SMT)  ). 
   • NG: Replace accelerator pedal position sensor (See  REMOVAL  ). 
   • OK: Go to next step. 
3. Check voltage between terminals VC and E2 of ECM connector. 

   PREPARATION: 

   1. Turn the ignition switch to ON.

   CHECK: 

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

   OK: 

   Voltage: 4.5 to 5.5 V 

   Fig 2: Checking Voltage Between Terminals VC And E2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   • OK: Go to next step. 
4. Check voltage between terminals VPA and E2, and VPA2 and E2 of ECM connectors. 

   PREPARATION: 

   1. Turn the ignition switch to ON.

   CHECK: 

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

   OK: 

   Fig 3: Checking Voltage Between Terminals VPA & E2 And VPA2 & E2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 4: VPA & E2 And VPA2 & E2 Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   • NG: Go to next step. 
5. Check for open and short in harness and connectors in VC, VPA, VPA2 and E2 circuits between ECM and accelerator pedal position sensor (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   • NG: Repair or replace harness or connector. 
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 

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

1. Check accelerator pedal position sensor (See  THROTTLE BODY (SMT)  ). 
   • NG: Replace accelerator pedal position sensor (See  REMOVAL  ). 
   • OK: Go to next step. 
2. Check voltage between terminals VC and E2 of ECM connector. 

   PREPARATION: 

   1. Turn the ignition switch to ON.

   CHECK: 

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

   OK: Voltage: 4.5 to 5.5 V 

   Fig 5: Checking Voltage Between Terminals VC And E2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • NG: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   • OK: Go to next step. 
3. Check voltage between terminals VPA and E2, and VPA2 and E2 of ECM connectors. 

   PREPARATION: 

   1. Turn the ignition switch to ON.

   CHECK: 

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

   OK: 

   Fig 6: Checking Voltage Between Terminals VPA & E2 And VPA2 & E2

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   Fig 7: VPA & E2 And VPA2 & E2 Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ). 
   • NG: Go to next step. 
4. Check for open and short in harness and connectors in VC, VPA, VPA2 and E2 circuits between ECM and accelerator pedal position sensor (See  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   • NG: Repair or replace harness or connector. 
   • OK: Replace ECM (See  ENGINE CONTROL MODULE (ECM)  ).