Inspection Procedure

HINT:

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 voltage for accelerator pedal position sensor data. 

   PREPARATION: 

   1. Connect the hand-held tester to the DLC3.
   2. Turn ON the ignition switch. Push the hand-held tester main switch.
   3. On the hand-held tester, enter the following menus: DIAGNOSIS / ENHANCED OBD II / DATA LIST / ETCS / ACCEL POS #1 and ACCEL POS #2.
   Fig 1: Depressing & Releasing Brake Pedal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   CHECK: 

   Read the voltage for the accelerator pedal position sensor data.

   OK: 

   ACCELERATOR PEDAL POSITION SENSOR VOLTAGE
   
   

   Accelerator Pedal	ACCEL POS #1	ACCEL POS #2
   Released	0.5 to 1.1 V	1.5 to 2.9 V
   Depressed	2.5 to 4.6 V	3.5 to 5.5 V

   1. OK: Replace ECM (see  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG: Go To Next Step 
2. Check accelerator pedal assembly (accelerator pedal position sensor) (see  ACCELERATOR PEDAL POSITION SENSOR  ). 
   1. NG: Replace accelerator pedal assembly. 
   2. OK: Go To Next Step 
3. Check voltage between terminals VPA and EPA, and VPA2 and EPA2 of ECM connector. 

   PREPARATION: 

   1. Remove the glove compartment (see ENGINE CONTROL MODULE (ECM) ).
   2. Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminals VPA and EPA, and VPA2 and EPA2 of the ECM connector.

   Fig 2: Identifying Terminals VPA, EPA, VPA2 & EPA2 Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: 

   Fig 3: ECM Connector Terminals Voltage Chart

   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 wire harness in VCPA, VCP2, VPA, VPA2, EPA and EPA2 circuits between ECM and accelerator pedal position sensor (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. OK: Repair or replace. 
   2. NG: Replace accelerator pedal assembly (see  ACCELERATOR PEDAL POSITION SENSOR  ). 

OBD II scan tool (excluding hand held tester): 

1. Check voltage between terminals VPA and EPA, and VPA2 and EPA2 of ECM connector. 

   PREPARATION: 

   1. Remove the glove compartment (see ENGINE CONTROL MODULE (ECM) ).
   2. Turn the ignition switch ON.

   CHECK: 

   Measure the voltage between terminals VPA and EPA, and VPA2 and EPA2 of the ECM connector.

   Fig 4: Identifying Terminals VPA, EPA, VPA2 & EPA2 Of ECM Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   OK: 

   Fig 5: ECM Connector Terminals Voltage Chart

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   1. OK: Replace ECM (see  ENGINE CONTROL MODULE (ECM)  ). 
   2. NG: Go To Next Step 
2. Check for open and short in wire harness in VCPA, VCP2, VPA, VPA2, EPA and EPA2 circuits between ECM and accelerator pedal position sensor (see  HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE  ). 
   1. OK: Repair or replace. 
   2. NG: Replace accelerator pedal assembly (see  ACCELERATOR PEDAL POSITION SENSOR  ).