NEW WIRING HARNESS ASSY. IN-HARNESS TEMP. SENSOR PKG.

SUBJECT: NEW WIRING HARNESS ASSEMBLY WITH IN-HARNESS TEMPERATURE SENSOR INFORMATION

MODEL and YEAR: 1991-92 C/K, R/V, P AND G TRUCKS WITH 4L80-E/4L80-EHD AUTOMATIC TRANSMISSION

(Figures 2 and 3)

New Wiring Harness Assembly with an in-line temperature sensor. Replaces current design Temperature Sensor.

Start of Production Date: (Figure 1) ------------------------------------ Starting March 31, 1992 (Julian Date 090) all 1992 HYDRA-MATIC 4L80-E/4L80-EHD Transmissions were built with a new Wiring Harness Assembly which has an in-line temperature sensor.

Service Procedure:

Transmissions built prior to this date can be serviced with the previous design Sensor. To service the new wiring harness, leave the current sensor in the previous valve body unconnected. There is no connector for the sensor. To service the previous valve body assembly use the new wiring harness assembly and the valve body assembly together, available in a service package. New valve body assembly cannot be serviced with previous wiring harness. Caution: Use care when removing the wiring harness connectors. Broken connectors require a new harness assembly.

Service Parts Information:

PART NUMBER NAME MODELS ----------- ---- ------ 8686985 Pkg.-Electrical Wiring All Harness Assembly

8686976 Pkg.-Valve Body Assembly 91-BAP,BBP,BJP,BMP, BNP,CAP,CBP,CKP,CRP 92-BAP,BJP,BMP,BNP BSP,BUP,BYP,BZP, JDP,LAP,LFP,LLP, MAP,MBP,MJP,MKP, MLP,MPP

8686978 Pkg.-Valve Body Assembly 91-ABP,ACP,ADP 92-ABP,ACP,AFP,AJP,AHP

8686979 Pkg.-Valve Body Assembly 91-DNP,DPP 92-DNP,DPP

8686980 Pkg.-Valve Body Assembly 91-DCP,DDP,DLP,DRP 92-DCP,DLP,DRP,MHP, TSP,TWP

8686981 Pkg.-Valve Body Assembly 91-DSP 92-HTP

Parts are currently available from GMSPO.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.