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2003 Hyundai Sonata 2.4L, Vin S, Eng Cfg L4, USA Has a code P0350 for an ignition coil control circuit malfunction. Engine starts and idles ok but won’t rev up. Seems to have good spark. 1. Scope the trigger signals to the coils on the Orange and White wires, there should be square wave signals. If the trigger signals get erratic, scope the camshaft and crankshaft position sensor signals. 2. If only one of the coils has an erratic signal and the other does not, swap the coils and see if the bad signal follows the coil, if so the coil may be faulty. 3. Verify the coil trigger circuits are not open or shorted between the engine control module and the coils. 4. Check engine control module power and ground while the problem occurs. Coil Engine Control Module (ECM) Open Wire Shorted Wire

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Condition General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2001 model year Chevrolet Silverado, Suburban; GMC Sierra and Yukon XL model vehicles, equipped with an 8.1L V8 (RPO L18 – VIN G) engine. Some of these vehicles have a condition in which the crankshaft position sensor can fail intermittently or permanently. If the sensor fails intermittently, the Service Engine Soon (SES) light may illuminate and the vehicle may run rough. In addition, the engine may stall, and if so, may re-start immediately or after a cool down period. If the sensor fails permanently, the engine will quit running and will not re-start.

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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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Remove or Disconnect: 1. Disconnect negative battery cable 2. Remove serpentine belts from crankshaft pulley 3. Properly raise and support vehicle 4. Remove right front tire and wheel assembly 5. Remove right inner fender access cover 6. Using 28 mm socket, remove crankshaft harmonic balancer retaining bolt 7. Using special tool J38197, remove crankshaft harmonic balancer 8. Remove crankshaft position sensor shield 9. Disconnect sensor electrical connector 10. Remove sensor from block face Install or Connect: 1. Install crankshaft position sensor to block face 2. Tighten bolts Torque Value: 20-40 N-m (14-28 lb.ft.) 3. Install crankshaft position sensor shield 4. Connect electrical connector 5. Install balancer on crankshaft 6. Apply thread sealer GM #1052080 or equivalent to threads of crankshaft balancer bolt Torque Value: 150 N-m + 76° (110 lb.ft. + 76°) 7. Install inner fender shield 8. Install tire and wheel assembly Torque Value: 140 N-m (104 lb.ft.) 9. Lower vehicle 10. Install serpentine belt 11. Connect negative battery cable

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REMOVE OR DISCONNECT 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. Serpentine belt from the crankshaft pulley. Raise the vehicle on a hoist. Right front tire and wheel assembly. Right inner fender access cover. Using a 28 mm socket, remove the crankshaft harmonic balancer retaining bolt. Crankshaft harmonic balancer using tool J 38197 or equivalent. Sensor electrical connector. Foreign object deflector. (DO NOT use a pry bar.) Sensor and pedestal from block face. Sensor from pedestal. INSTALL OR CONNECT: Loosely install the crankshaft sensor on the pedestal. Position the sensor with pedestal attached on special Tool J 37089. Position the special tool on the crankshaft. Bolts to hold the pedestal to the block face, torque to 20-40 Nm (14-28 ft lbs). Torque the pedestal pinch bolt to 4-4.5 Nm (36-40 in lbs). Remove special tool J 37089. Foreign object deflector. Place the special tool 37089 on the harmonic balancer and turn. If any vane of the harmonic balancer touches the tool, replace the balancer assembly. 9. Balancer on the crankshaft. ^ Apply thread sealer (GM 1052080) or equivalent to the threads of the balancer bolt. 1. 2. 3. 4. 5. 6. 7. 8.