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revise the Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement procedure in the Variable Effort Steering (1998-2001 model years) or Steering Wheel and Column (2002-2003 model years) and add the Steering Wheel Position Sensor Centering procedure in the Steering Wheel and Column sub-sections of the Service Manual. Please replace the current information in the Service Manual with the following information. The following information has been updated within SI. If you are using a paper version of this Service Manual, please make a reference to this bulletin on the affected page. Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement Removal Procedure Caution: Refer to SIR Caution in Cautions and Notices. 1. Disable the SIR system. Refer to SIR Disabling and Enabling Zone 3 in SIR. 2. Remove the steering column from the vehicle. Refer to Steering Column Replacement. 3. Remove the following from the steering shaft: 3.1. steering shaft seal (7) 3.2. sensor retainer (6) 3.3. steering wheel position sensor (5), refer to Steering Wheel Position Sensor Centering. 3.4. 2 lower spring retainers (4) 3.5. lower bearing spring (3) 3.6. lower bearing seat (2) 3.7. adapter and bearing assembly (1) Installation Procedure

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DESCRIPTION The Throttle Position (TP) sensor is a potentiometer. The TP sensor is connected to the throttle shaft on the throttle body. By monitoring the voltage on the signal line, the VCM calculates throttle position. As the throttle valve angle is changed (accelerator pedal moved), the TP sensor signal also changes. At a closed throttle position, the output of the TP sensor is low. As the throttle valve opens, the output increases so that at Wide Open Throttle (WOT,) the output voltage should be above 4.0 volts. PURPOSE The VCM calculates fuel delivery based on throttle valve angle (driver demand). A broken or loose TP sensor may cause intermittent bursts of fuel from an injector. This may cause an unstable idle because the VCM detects the throttle is moving.

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Throttle Body And TPS – Remove throttle body, refer to COMPONENT REPLACEMENT AND REPAIR PROCEDURES. Throttle Stop Screw – Check that there is no clearance between throttle stop screw and lever with throttle plate in the fully closed position. TPS Screws – Loosen throttle position sensor set screws. TPS Adjustment Connect ohmmeter across throttle sensor terminals E2 and IDL. – Insert a 0.0157 in (0.40 mm) feeler gauge between throttle stop screw and lever. TPS Adjustment – Slowly turn sensor clockwise until ohmmeter shows no continuity. – Tighten sensor set screws. – Check adjustment with the following feeler gauges and note ohm reading: 0.010 in (0.25 mm) – Continuity 0.0335 in (0.85 mm) – No continuity – If desired results cannot be achieved, readjust sensor. If readings still cannot be achieved, replace sensor.

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Component Inspection ACCELERATOR PEDAL POSITION SENSOR 1. Reconnect all harness connectors disconnected. 2. Turn ignition switch “ON”. 3. Check voltage between ECM terminals 106 (APP sensor 1 signal), 98 (APP sensor 2 signal) and engine ground under the following conditions. 4. 5. 6. 7. If NG, replace accelerator pedal assembly. Perform “Accelerator Pedal Released Position Learning”. Perform “Throttle Valve Closed Position Learning”. Perform “Idle Air Volume Learning”.

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Linkage Measurement CAUTION: Before attempting to test the Throttle Position Sensor (TPS), verify the linkage adjustment dimension shown in the figure above. This dimension MUST be 126.5 mm (5.0 inches) BEFORE testing. For linkage adjustment procedures, refer to Throttle Linkage Adjustment. CAUTION: Before testing the TPS, verify that the engine is set at correct low idle speed. Refer to Idle Speed Adjustment. This can be found in the Fuel Delivery and Air Induction system adjustments section. 1. After confirming the correct linkage adjustment and idle speed, proceed to the following: Throttle Position Sensor Location 2. Attach a paper clip into the center terminal of the TPS electrical connector. Do not remove the connector from the TPS for this test. 3. Attach the positive lead of a voltmeter to this paper clip and the negative lead to a good ground. 4. Turn the ignition switch to the ON position. Do not start engine. 5. The voltage at the TPS center terminal should be 1.0 volt (+/- 0.2 volt) with linkage at idle position. The voltage at the wide open throttle position