sono ubicati sui longheroni del telaio,parte anteriore,vicino ai passaruota,dicono di rimuovere le plastiche zona passaruota batteria,e anche il supporto batteria,sono scatoline nere ben camuffate sul longherone e nascoste dalle canaline dei cavi per accedervi (non e' facile c'e' da smontare roba e solo per carteggiare le viti e la parte del telaio dove fanno massa ).sono a destra e sinistra sui longheroni.
foto dell'aggeggino per fare massa tra A e K
neanche in questa foto e' visibile,devi togliere il supporto batteria e guardare sul lato verso la ruota del longherone o comunque in zona,non ho trovato schemi tecnici
dovrebbero essere questi
1990: Service Bulletin: SIR Diagnostics and Procedures to Prevent Codes 16 and 26 Due to Corrosion Revised
Subject: SERVICE MAN. UPDATE SEC.9J A/B REV. SIR DIAGNOSTIC PROCEDURE
Model and Year: 1990 CORVETTE
Source: Chevrolet Service Bulletin
Bulletin Number: 90-436-9J - (11/07/1991)
Some 1990 Corvettes have set SIR Sensor Codes 16 and 26. The DERM has detected an unacceptably high resistance between the SIR sensor and the frame rail, most likely due to a buildup of corrosion on the mounting surfaces. New service procedures have been developed to remove the corrosion and help prevent it from building up again. Diagnostic charts and removal and installation procedures, revised to address the corrosion issue, are attached. Please use these new procedures for all 1990 Corvette SIR Code 16 and Code 26 situations you encounter.
IMPORTANT! - The corrosion condition and repair procedures apply only to 1990 Corvette; 1991 and subsequent vehicles do not set sensor codes due to this condition.
The new procedures require the use of a special grease (P/N 12345579) and two external-tooth lock washers (P/N 11501869 - 8 mm, P/N 121753 - 6 mm) for the sensor mounting bolts.
Parts are currently available from GMSPO.
Along with the new procedures, please remember the following:
1. The "SIR Diagnostic System Check" in Section 9J-A must be the starting point of any SIR diagnostics. The "SIR Diagnostic System Check" will verify proper "INFL REST" warning lamp operation and will lead you to the correct chart to diagnose any SIR faults. Bypassing these procedures may result in extended diagnostic time, incorrect diagnosis, and incorrect parts replacement.
2. If both Code 15 and 16 (or 25 and 26) are set, use the Code 16(26) diagnosis chart first. Then, if Code 15(25) resets after the Code 16(26) is corrected, perform the Code 15(25) diagnosis.
3. To clear 1990 Corvette SIR codes, use the Tech 1 (part number T1 or 94-00101-A) with the 1991 Body Systems Cartridge (TKO4040A) and 1990 Dual UART/SIR Adapter (TA00065). The 1991 Body Systems Cartridge must be used because the 1990 Body Systems Cartridge has no SIR code-clearing capabilities for the 1990 Corvette.
If the Tech 1, cartridge, and adapter are not available, codes can be cleared by grounding Terminal "K" of the ALDL connector as called out below under "ALDL Code-Clearing Technique". If using the ALDL procedure, be sure to follow it completely and exactly; codes can be difficult to clear using this method if the procedure is not carefully followed.
4. If the ignition is turned "ON" while any part of the l99O Corvette SIR system is disconnected, a code will set and remain set, even if the component is reconnected, until cleared by the technician.
Labor Operation C8813 (Left Sensor) Labor Operation C8812 (Right Sensor)
Use applicable labor time guide for labor hours.
ALDL CODE-CLEARING TECHNIQUE
When using this code-clearing technique, a digital wristwatch can be quite helpful. The timing sequence discussed below is very important to successfully clearing codes. The watch can help you with timing the 3-second intervals more exactly.
1.Turn ignition "OFF".
2. Ground ALDL terminal "K".
3. Turn ignition "ON".
4. Wait for codes to begin flashing (approximately 5 seconds). When codes begin flashing, unground ALDL terminal "K" for 3 seconds +/- 1/2 second.
5. After ungrounding terminal "K" as described in Step 4, ground it again for 3 seconds +/- 1/2 second.
6. Unground ALDL terminal "K", and wait 10 seconds. Before turning ignition "OFF", verify that Code 12 flashes six (6) times. If Code 12 does not flash six (6) times, codes have not been cleared properly. Begin clearing procedure again starting with Step 1.
CODE 16 FRONT SENSOR #1 (LH) (SENSOR FAULT) --------------
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