S-10/T-10 Truck, Blazer and Jimmy

S-10/T-10 TRUCK, BLAZER AND JIMMY




^ Circuit 821 or 822 shorted to ground at the metal bracket below the distributor or as it crosses the top of the bellhousing (figure 4).

^ Circuit 821 or 822 shorted to ground at the right hand valve cover area, heat stove or dipstick tube area.

^ Short to ground in VSS circuit 821 (or 822, on four wheel drive versions). The problem is usually at the top of the transfer case where the wiring harness is routed over the top. The harness generally rubs through on one of the flanges of the transfer case, or becomes shorted to ground at one of the wiring harness hold-down clamps on the transmission.




^ Ground G-104 or G-102 loose or corroded (figure 5). (G-104, G-102 are located at the rear of the cylinder head on 4.3L applications, and on the passenger side, at the lower corner of the bellhousing on 2.2L applications).

^ A short to ground in circuit 350 (ABS control module or brake switch), which will result in a brake fuse failing. A problem in this circuit is likely to result in an ABS code and service light. In addition, TCC will not release and a malfunction in the operation of the cruise control will be apparent.

^ Loose output or extension housing bushings on 2WD models.

^ A loose or damaged toothed-wheel on the output shaft which is used for the VSS.




^ Connector C-212 is not fully connected or its terminals are damaged. C-212 is a 10-pin connector mounted next to the PCM (figure 6).

^ The 4WD low-input circuit 1694, which feeds pin F-8 of the PCM may be intermittently shorting to ground. This will change the PCM's ratio calculation for the VSS, which may result in setting code 72.