Inspection Procedure

HINT:

Read freeze frame data using the hand-held tester. 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.

INSPECT THROTTLE BODY ASSY (THROTTLE ACTUATOR RESISTANCE)
1. Disconnect the throttle actuator connector.
2. Measure the resistance between the terminals 1 and 2 of the throttle actuator.
  Standard: 0.3 to 100 Ω at 20°C (68°F)
  
  Fig 1: Measuring Resistance Between Terminals 1 & 2 Of Throttle Actuator
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
1. NG: REPLACE THROTTLE BODY ASSY (See REPLACEMENT )
2. OK: Go to next step.

CHECK WIRE HARNESS (THROTTLE BODY ASSY - ECM)

Disconnect the T26 throttle actuator connector.
Disconnect the E2 ECM connector.

Measure the resistance of the wire harness side connectors.

Standard:

RESISTANCE SPECIFICATIONS

Tester Connection	Specified Condition
T26-1 - E2-1 (M-)	Below 1 ohms
T26-2 - E2-2 (M+)	Below 1 ohms
T26-1 or E2-1 (M-) - Body ground	10 k ohms or higher
T26-2 or E2-2 (M+) - Body ground	10 k ohms or higher

Fig 2: Identifying T26 Throttle Actuator Connector Terminals

NG: REPAIR OR REPLACE HARNESS AND CONNECTOR
OK: Go to next step.

INSPECT THROTTLE BODY ASSY
1. Check the throttle body assy for foreign objects.
  OK: No foreign objects between the throttle valve and the housing.
1. NG: REMOVE FOREIGN OBJECT AND CLEAN THROTTLE BODY
2. OK: Go to next step.
INSPECT THROTTLE VALVE
1. Check if the throttle valve can open and close smoothly.
  OK: Throttle valve can move smoothly.
1. NG: REPLACE THROTTLE BODY ASSY (See REPLACEMENT )
2. OK: REPLACE ECM (See REPLACEMENT )