VEHICLE DOES NOT START READILY UPON CRANKING. GMC Truck S15 Pickup - 2WD 1994

For 1990-2009 cars

# VEHICLE DOES NOT START READILY UPON CRANKING

#### Subject: Vehicle Does Not Start Readily Upon Cranking (Replace Fuel Pump Relay) --------------------------------------------------------------------

#### Models: 1993-94 Chevrolet and GMC Truck M/L Vans 1994 Chevrolet and GMC Truck S/T Utility 1994 Oldsmobile Bravada with 4.3L Engine (VIN W, Z - RPOs L35, LB4) ---------------------------------------------

This bulletin is being revised to change the correction procedure and parts information and to add the L Van and artwork. Please discard Corporate Bulletin Number 56-63-05 (Section 6E - Engine Fuel & Emission).

#### CONDITION

Some owners may experience extended engine crank times on cold start and may set diagnostic trouble code 54 and activate the MIL (Check Engine light).

#### CAUSE

This condition may be due to failure of the fuel pump relay.

#### CORRECTION

Verify condition using the normal diagnostic procedure in the service manual. Replace the Fuel Pump Relay (P/N 12077867) following the service manual procedure. Replace the connector (Kit P/N 12166225) following the instructions in Figures 3 and 4. Note that each of the four cavities of the old connector are lettered. The new connector is numbered and it should be wired according to Figure 3 and not the instructions contained within the connector kit.

#### Parts Information

P/N Description Qty --- ------------ ---

12077867 Fuel Pump Relay 1 12166225 Connector 1 12129073 Bracket (S/T Only) 1

Parts are currently available from GMSPO.

Warranty Information

For vehicles repaired under warranty, use:

Labor Operation Description Labor Time --------- ----------- ----------- J5460 Relay, Fuel Pump Use Published Replace Labor Operation Time

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.