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brake pedal is pressed or has failed. Acceleration rate and Engine output are limited. One trip fault and the code will set within 5 seconds . ETC light is flashing. POSSIBLE CAUSES (F855) 5-volt supply circuit open (F855) 5-volt supply circuit shorted to ground (K23) APP sensor no.1 signal circuit open (K23) APP sensor no.1 signal circuit shorted to ground (K23) APP sensor no.1 signal circuit shorted to the (K167) APP sensor no.1 return circuit (K23) APP sensor no.1 signal circuit shorted to the (K400) APP sensor no.2 return circuit APP sensor PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. DIAGNOSTIC TEST 1. APP SENSOR BELOW 0.25 OF A VOLT Ignition on, engine not running. With a scan tool, read the APP Sensor No.1 voltage. Q: Is the voltage below 0.25 of a volt? YES: Go To 2 NO: Go To 11 2. (F855) 5-VOLT SUPPLY CIRCUIT WHEN MONITORED: With the ignition on and no other APPS No.1 DTCs present. SET CONDITION: When the APP Sensor No.1 voltage is too low. Engine will additionally idle if the Turn the ignition off. Disconnect the APP Sensor harness connector. Ignition on, engine not running. Measure the voltage on the (F855) 5-volt Supply circuit in the APP Sensor harness connector. Q: Is the voltage between 4.5 and 5.2 volts? YES: Go To 3 NO: Go To 8 3. ACCELERATOR PEDAL POSITION SENSOR

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Note: Use only gold-plated terminals when servicing terminals in harness connector of Camshaft Position (CMP) Sensor G40 . Special tools, testers and auxiliary items required Multimeter . Wiring diagram. Test requirements The Motronic Engine Control Module (ECM) J220 fuses OK. Battery voltage at least 12.5 volts. All electrical consumers such as, lights and rear window defroster, switched off. Vehicles with automatic transmission, shift selector lever into position “P” or “N” . A/C switched off. Ground (GND) connections between engine/transmission/chassis OK. Ignition switched off. Test procedure Perform a preliminary check to verify the customers complaint. Refer to Diagnosis . Start diagnosis Remove the engine cover. Disconnect the Camshaft Position (CMP) Sensor G40 electrical harness connector – arrow – . Switch the ignition on. Using a Multimeter , Check the Camshaft Position (CMP) Sensor G40 electrical harness connector terminals 1 to 3 for voltage. Specified value: at least 4.5 V Switch the ignition off. If the specification was not obtained: Checking wiring If the manufacturers test box is being used. Perform the following step. Install the Adapter F/VAG1598 (68 Pin) VAG1598/22 . Refer to Ignition – Repair Group 01 . If the manufacturers test box is not being used. Perform the following step. Remove the Motronic Engine Control Module (ECM) J220 . Refer to Module, Replacing .

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Camshaft Position (CMP) Sensor SHO Removal 1. Disconnect battery ground cable (14301) . Refer to Section 14-01. 2. Remove the engine appearance cover. For additional information, refer to Section 03-01C. 3. Disconnect engine control sensor wiring (12A581) from camshaft position sensor (CMP sensor) (6B288) . 4. Remove camshaft position sensor retaining bolt and remove camshaft position sensor from engine. Installation 1. Make sure camshaft position mounting sensor surface is clean and that camshaft position sensor O-ring is in proper location on camshaft position sensor . 2. CAUTION: Do not overtighten camshaft position sensor retaining bolt or damage to camshaft position sensor or engine mounting surface may occur. Position camshaft position sensor onto engine and install retaining bolt. Tighten retaining bolt to 8-12 Nm (71-106 lb-in). 3. Connect engine control sensor wiring to camshaft position sensor . 4. Install the engine appearance cover. For additional information, refer to Section 03-01C. 5. Connect battery ground cable . Camshaft Position Sensor

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ISSUE Some 2003-2005 Expedition/Navigator vehicles built before 12/06/2004 with memory seats may exhibit the driver’s power seat binding in the full rearward position and becoming inoperative in forward and reverse. This may be due to the horizontal seat motor and memory seat position sensor (potentiometer) on vehicles built before 10/16/2003, or due to the potentiometer (only) on vehicles built between 10/16/2003 and 12/05/2004. ACTION If the vehicle was built before 10/16/2003, inspect the horizontal motor bracket under the seat. If the bracket has bends on either side of the seat motor, install a horizontal seat motor kit. If the vehicle already has a straight bracket, or if the vehicle was built between 10/16/2003 and 12/05/2004, install a seat potentiometer kit only. Refer to the following Service Procedure.

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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