No Start Condition/Theft Deterrent - Reprogram Prom (87-65-06)

NO START CONDITION/THEFT DETERRENT - REPROGRAM PROM

TECHNICAL SERVICE BULLETIN

P1621, P1336, P1626, P1631, P1632, MIL, NO START CONDITION, THEFT DETERRENT AND CRANKSHAFT POSITION SENSOR RELATED DIAGNOSTIC TROUBLE CODES (REPROGRAM THE PCM)

Model(s): 1998 Chevrolet and GMC S models

Section: 6E - Engine Fuel & Emission

Bulletin No.: 87-65-06

Date: March, 1998

VEHICLES AFFECTED

1998 Chevrolet and GMC S models with 2.2L engine (VIN 4 - RPO LN2) and 5 speed transmission (RPO MW2).

Involved are certain 1998 S-Truck models equipped with the 2.2L (RPO LN2) VIN Engine Code 4, with RPO MW2 5-Speed manual transmission only. These vehicles fall within the following VIN Breakpoints:

Year	Division	Model	Plant	Plant Code	VIN Through& Including
1998	Chevrolet	S-10	Linden, NJ	K	WK146640
1998	GMC	Sonoma	Linden, NJ	K	WK506307
1998	Chevrolet	S-10	Shreveport, LA	8	W8141203
1998	GMC	Sonoma	Shreveport, LA	8	W8510490

CONDITION

Some customers may comment on an MIL illumination and possibly a no-start condition with a P1621 and/or a P1336 DTC set, and various DTC's related to the Theft Deterrent System.

CAUSE

A condition may occur where the PCM is induced to reset the crankshaft position sensor learn and the theft deterrent system.

CORRECTION

If there are no obvious mechanical concerns, reprogram the PCM with the revised calibration that takes into account the above conditions. These calibrations are available on CDROM #23 and later versions. In addition to this, the Crankshaft Position System Variation Learning Procedure may need to be performed, if P1336 persists. Perform the Crankshaft Position Sensor Variation Learning Procedure using information from the Engine Controls Section of the appropriate Service Manual.

SERVICE PROCEDURE

1. Install a scan tool and verify that one of the previously noted DTC's is set.
2. Note the calibration identification currently in the PCM.
3. Flash the PCM with the Calibration Number listed in the table below.
4. Operate the vehicle and check for any additional DTC's.
5. If the vehicle exhibits a DTC P1336 after the PCM has been reflashed, perform the Crankshaft Position System Variation Learning Procedure as noted in the Engine Controls Section of the appropriate Service Manual.

CALIBRATION NUMBERS

Use the correct calibration from the list below.

Engine/Trans	New Cal	BCC	Old Cal	BCC	Usage
LN2 and 5-Speed Manual Transmission Calif. Tier 1	9356833	CLZS	9354143	CKWF	LN2: MW2: GT4Z83/Z85: NB6
LN2 and 5-Speed Manual Transmission Unl. Export CHEV GMC	9356843	CLZT	9353923	CKWF	LN2: MW2: GT4Z83/Z85: NN8
LN2 and 5-Speed Manual Transmission Nationwide	9356853	CLZU	9353933	CKRF	LN2: MW2: GT5 Z83/Z85 NF2/NB6 Z89: NN8
LN2 and 5-Speed Manual Transmission Un. Export CHEV GMC	9356863	CLZW	9353943	CKRJ	LN2: MW2: GT5Z83/Z85: NN8
LN2 and 5-Speed Manual Transmission Sport Susp. Nationwide	9356873	CLZX	9353973	CKRM	LN2: MW2: GT4ZQ8: NF2/NB6
LN2 and 5-Speed Manual Transmission Sport Susp. Nationwide	9356883	CLZY	9353983	CKRN	LN2: MW2: GT5ZQ8: NF2/NB6

WARRANTY INFORMATION

For vehicles repaired under warranty, use:

Labor Operation No.: J6355 - PROM Reprogram, On Car

Labor Time: Use published labor operation time.

Labor Operation No.: J6352 - PROM Reprogram, Off Car

Labor Time: Use published labor operation time.