SERVICE MANUAL UPDATE-SEC. 6E2 THROTTLE POSITION SENSOR

Subject: THROTTLE POSITION SENSOR RESISTANCE READINGS

Model and Year: 1989-91 GEO METRO WITH 1.0L ENGINE

The chart included in this service bulletin has updated resistance specifications. When performing resistance measurements to the throttle position sensor, the chart in this service bulletin should be used.

This chart replaces the chart shown in the following service publications:

- Figure C2-33 on page 6E2-C2-17 of the 1989 Geo Metro Service Manual (ST370-89)

- Figure C2-32 on page 6E2-C2-15 of the 1990 Geo Metro Service Manual (ST370-90)

- Figure C2-32 on page 6E2-C2-16 of the 1991 Geo Metro Service Manual Supplement (ST370-91S)

- Figure C2-32 on page 6E2-C2 of Dealer Service Update Bulletin 90-202-6E (Corporate 016514) date April, 1990

TERMINALS CONDITIONS RESISTANCE

WHEN THROTTLE LEVER-TO-STOP SCREW 0-5 K Omega

BETWEEN CLEARANCE IS TERMINAL"A" 0.3 mm (0.012 in.) AND TERMINAL "B" WHEN THROTTLE (IDLE SWITCH) LEVER-TO-STOP SCREW INFINITE CLEARANCE IS 0.9 mm (0.035 in.)

BETWEEN TERMINAL"A" - 4.37-8.13 K Omega AND TERMINAL "B"

THROTTLE BETWEEN VALVE IS AT 240-1140 Omega TERMINAL"A" IDLE POSITION AND TERMINAL"C" THROTTLE VALVE IS FULLY 3.17-6.6 K Omega OPENED

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.