Inspection Procedure

NOTE: 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, as well as other data from the time when a malfunction occurred.

Check throttle position sensor.
PREPARATION:

Disconnect the throttle position sensor connector.

CHECK:
1. Measure the resistance between terminals VC and E2 of the throttle position sensor.
2. Measure the resistance between terminals VTA and E2 of the throttle position sensor.
3. Measure the resistance between terminals VTA2 and E2 of the throttle position sensor.
OK:

Fig 2: Throttle Position Sensor Terminals Resistance Table
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: Replace throttle position sensor.
2. OK: Go to next step.
Check voltage between terminals VC and E2 of ECM connector.
PREPARATION:
1. Remove the ECM hood (See ENGINE CONTROL MODULE (ECM) ).
2. Turn the ignition switch ON.
CHECK:

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

Fig 3: Measuring Voltage Between Terminals VC & E2 Of ECM Connector
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

Voltage: 4.5 to 5.5 V
1. NG: Replace ECM (See ENGINE CONTROL MODULE (ECM) ).
2. OK: Go to Next Step
Check for open and short in harness and connector between throttle position sensor and ECM (See HOW TO USE THE DIAGNOSTIC CHART AND INSPECTION PROCEDURE ).
1. NG: Repair or replace harness or connector.
2. OK: Go to next step.
  Replace throttle position sensor.