STEP 2. Using scan tool (M.U.T.-III), check data list item 13: Throttle Position Sensor (main).
(1) Detach the intake air hose at the throttle body.
(2) Disconnect the connector of the throttle body assembly.
(3) Use test harness special tool (MB991658) to connect only terminals TPSE, TPSM, TPS5 and TPSS line.
(4) Turn the ignition switch to the "ON" position.
(5) Set scan tool (M.U.T.-III) to the data reading mode for item 13, Throttle Position Sensor (main).- Output voltage should be between 0.3 and 0.7 volt when the throttle valve is fully closed with your finger.
- Output voltage should be 4.0 volts or more when the throttle valve is fully open with your finger.
(6) Turn the ignition switch to the "LOCK" (OFF) position.
Is the sensor operating properly?
Go to Step 3. Refer to, DTC P0122 - Throttle Position Sensor (main) Circuit Low Input , DTC P0123 - Throttle Position Sensor (main) Circuit High Input .