Throttle Position Sensor: Testing and Inspection
TROUBLESHOOTING HINTSHint 1:
The signals of the throttle position sensor are more important fore control of the automatic transmission than for control of the engine; shifting "impact shocks" are produced if there is a malfunction of the throttle position sensor.
Hint 2:
If the voltage of the throttle position sensor is outside the standard value, check once again after making the throttle position sensor adjustment. In addition, if there are any indication that the fixed SAS has been moved, adjust the fixed SAS.
INSPECTION
Using Scan Tool
HARNESS INSPECTION
STEP 1. Check for continuity in the ground circuit.
- Throttle position sensor connector: Disconnected
OK: GO TO STEP 2
NG: Repair the harnesses. (A1 - 92)
STEP 2. Check for an open or short-circuit between the throttle position sensor and the engine control module.
- Throttle position sensor connector: Disconnected
- Engine control module connector: Disconnected
- All control module connectors, such as the ECM connector, which use throttle position sensor output: Disconnected
OK: GO TO STEP 3
NG: Repair the harnesses. (A3 - 84, A4 - 81)
STEP 3. Measure the applied voltage.
- Throttle position sensor connector: Disconnected
- Engine control module connector: Connected
- Ignition switch: ON
Voltage (V): 4.8 - 5.2
OK: STOP
NG: Replace the engine control module.
THROTTLE POSITION SENSOR CHECK
(1) Disconnect the throttle position sensor connector.
(2) Measure the resistance between terminal (1) (sensor ground) and terminal (4) (sensor power).
Standard value: 3.5 - 6.5K Ohm
(3) Connect a pointer type ohmmeter between terminal (1) (sensor ground) and terminal (3) (sensor output).
(4) Open the throttle valve slowly from the idle position to the full open position and check that the resistance changes smoothly in proportion with the throttle valve opening angle.
(5) If the resistance is outside the standard value, or fails to change smoothly, replace the throttle position sensor.
TPS installation torque: 2.0 Nm (1.5 ft.lbs.)