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SERVICE INFORMATION If an applied vehicle has DTC P0100 stored and possibly exhibits, • • • Engine rough running Engine surging Low engine power the cause may be an airflow sensor that has been damaged by air-ingested dust/dirt. To resolve this incident, if it should occur, follow the steps outlined in the Service Procedure on page 2. Service Procedure Summary: • Remove dust/dirt/debris from inside the air cleaner housing. This will help prevent another incident. • A new genuine Nissan air filter element must be used for all warranty claims, and any other claim for which Nissan pays. A new genuine Nissan air filter element is designed to be compatible with the Nissan air flow meter and has proven to provide adequate dust protection to help prevent these incidents. It is strongly recommended that incident customers continue using Nissan genuine air filters for assured protection when replacing according to the routine maintenance schedule. See parts information for the air filter part number (P/N). • Install a new complete airflow meter assembly. See Parts Information for the part number (P/N). • Reprogram the ECM with special new data that is matched to the different output characteristics of the new airflow meter.

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some 2000-2002 model year Nissan Sentra vehicles equipped with the 1.8 liter engine and some 2002-2003 model year Nissan Sentra vehicles equipped with the 2.5 liter engine may have a defect which relates to motor vehicle safety. The engine might stop running while being driven due to contamination of the Engine Control Module (ECM) by the inner lining material. This may also result in the “Service Engine Soon” light coming on or poor driveability. If the engine stops running while driving, this could result in a crash without warning. SERVICE PROCEDURE Remove/discard the Foam from the inside of the ECM Case Holder as follows. The ECM Case Holder will have to be re-positioned (moved) to do this procedure. NOTE: • Use suitable covers to protect vehicle paint, trim, etc. when doing this procedure. • Step one (below) only applies to vehicles equipped with a Strut Tower Cross Bar. • Doing step one will allow clearance for removing the ECM Case Holder from the engine room wall. 1. If equipped, re-position the Strut Tower Cross Bar and remove the Strut Tower Cross Bar Mounting Bracket as follows: a. Remove the nut/bolt that holds the Strut Tower Cross Bar to the Strut Tower Cross Bar Mounting Bracket (see Figure 1). b. Reposition the Strut Tower Cross Bar UP and OUT of the way. c. Take off three Nuts and remove the Strut Tower Cross Bar Mounting Bracket (see Figure 2). 2. Remove two Screws that hold the Main Wiring Harness Support Bracket to the Strut Tower (see Figure 3). 3. Disconnect the Rubber Vent Tube from the ECM Case Holder (see Figure 4). 4. If equipped, remove two Screws and re-position the Manifold Absolute Pressure (MAP) Sensor (see Figure 5). 5. Re-position the Throttle Cable Guide by removing it from the Metal Tab (see Figure 5).

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2000 – 2001 I30 (CA33) 1999 I30 (CA32) 1999.5 – 2001 QX4 (JR50) 1997 – 2001 Q45 (FY33) 2000 – 2001 G20 (P11)
This bulletin describes and introduces new features of the Infiniti Vehicle Immobilizer System/Nissan Anti-Theft System (IVIS/NATS). The system is standard equipment on each of the applied vehicles listed above. The IVIS/NATS will not allow the engine to start without the use of a registered ignition key. If a vehicle will not start and the Security lamp is on solid, it may be because the ignition keys were not properly registered into the vehicle’s NATS IMMU (Immobilizer control unit). In this case, there will be a “DIFFERENCE OF KEY” code stored in the NATS IMMU. When the NATS ignition key, IMMU, or ECM (ECCS control unit) are replaced, C/U initialization is necessary. It is also necessary when registering keys and as part of many NATS Service Manual diagnostic procedures.

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Some 2000-2009 Focus vehicles may exhibit an excessive engine vibration at idle, most noticeable when the transmission is engaged in reverse. This condition may be caused by small stones, road debris, ice or snow packed / lodged in the rear engine roll restrictor. ACTION: Inspect the rear engine roll restrictor for debris and install service shield if necessary. SERVICE PROCEDURE 1. 2. 3. 4. 5. Inspect the rear engine roll restrictor for debris. Remove any debris from rear engine roll restrictor. Remove the cross member-to-roll restrictor attachment bolt. Install service shield. (Figure 1) Install roll restrictor attachment bolt and torque to 35 lb-ft (47 N-m).

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Subject: Models: Low Engine Coolant Level Indicator Always On (Diagnose Low Coolant Level System Operation/Check Sensor for Oil Contamination) 2000-2002 Buick Century, Regal 2000-2001 Chevrolet Lumina 2000-2002 Chevrolet Impala, Monte Carlo 2000-2002 Pontiac Grand Prix 2000-2002 Oldsmobile Intrigue Condition Some customers may comment that the low engine coolant level indicator is always illuminated. Cause The cause of this condition may be due to engine oil contaminating the coolant. Possible sources of oil contamination are internal engine leaks, improper service procedures, or the addition of some types of anti-leak additives to the cooling system. Once in the coolant, the oil leaves deposits on the level sensor creating an insulating film. This film results in a false activation of the coolant level indicator. Correction Diagnose low coolant level system operation and check the sensor for oil contamination using the procedure listed below. Important: No coolant supplements should be used in GM cooling systems, other than what is approved and recommended by GM. The use of “aftermarket” over-the-counter sealing and cooling supplements may affect the operation of the low coolant level sensor. Discoloration of the coolant recovery bottle is normal and does not necessarily indicate that coolant contamination is present. Flush cooling system only when instructed by this bulletin. 1. Verify that the coolant is at proper level in the radiator and the coolant recovery bottle. If the coolant is low, add proper amount of 50/50 water and DEX-COOL® mixture. If the low coolant light operates properly, diagnose the cooling system for loss of coolant as outlined in SI. DO NOT proceed further with this bulletin. 2. Remove the low coolant level sensor. Refer to Coolant Level Module Replacement in the Engine Cooling sub-section. 3. With the key on, the engine off and the coolant level sensor disconnected from the vehicle wiring harness, observe the low coolant light: • Light is on — Chassis wiring or instrument cluster concern. Follow the appropriate diagnostic information in SI. • Light is out — Proceed to Step 4.