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.

Visually check throttle valve.
PREPARATION:

Remove the intake air connector.

CHECK:

Check whether or not a foreign body is caught between the throttle valve and housing. Also, check if the valve can open and close smoothly.
1. NG: Remove foreign body and clean throttle body.
2. OK: Go to next step.

Check throttle control motor.

PREPARATION:

Disconnect the throttle control motor and sensor connector.

CHECK:

Measure the resistance between terminals of the throttle control motor.

Fig 1: Measuring Resistance Between Terminals

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

OK:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
M+ (T14-2) - M- (T14-1)	0.3 to 100 Ω (20°C (68°F))

NG: Replace throttle body (See THROTTLE BODY ).
OK: Go to next step.

Check for open and short in harness and connector between ECM and throttle control motor.

PREPARATION:

Disconnect the T14 throttle control motor and sensor connector.
Disconnect the E6 ECM connector.

CHECK:

Measure the resistance between the wire harness side connectors.

Fig 2: Measuring Resistance Between Wire Harness Side Connectors (1 Of 2)

Fig 3: Measuring Resistance Between Wire Harness Side Connectors (2 Of 2)

OK:

TESTER CONNECTION SPECIFIED CONDITION

Tester Connection	Specified Condition
M+ (T14-2) - M+ (E6-3)	Below 1 Ω
M- (T14-1) - M- (E6-2)	Below 1 Ω
M+ (T14-2) or M+ (E6-3) - Body ground	10 kΩ or higher
M- (T14-1) or M- (E6-2) - Body ground	10 kΩ or higher

NG: Repair or replace harness or connector.
OK: Check for intermittent problems (See PRE-CHECK )