SMU - SECTION 8C - REVISED 'LOW OIL LEVEL' INDICATOR. Chevrolet Impala 1995

SUBJECT: SERVICE MANUAL UPDATE - SECTION 8C - REVISED "LOW OIL LEVEL" INDICATOR GENERAL DESCRIPTION

MODELS: 1994-96 BUICK ROADMASTER 1994-96 CADILLAC FLEETWOOD 1994-96 CHEVROLET CAPRICE

THIS BULLETIN IS BEING ISSUED TO REVISE THE "LOW OIL LEVEL" INDICATOR GENERAL DESCRIPTION IN SECTION 8C OF THE SERVICE MANUAL. THE "LOW OIL LEVEL" INDICATOR GENERAL DESCRIPTION INCORRECTLY STATES THAT THE PCM CHECKS FOR A LOW OIL LEVEL CONDITION, AT A PRE-DETERMINED TIME, AFTER THE IGNITION SWITCH HAS BEEN TURNED "OFF".

SECTION 8A CORRECTLY STATES THAT THE PCM CHECKS COOLANT TEMPERATURE DROP FROM THE LAST IGNITION CYCLE, TO DETERMINE WHEN TO CHECK FOR A LOW OIL LEVEL CONDITION, AS NOTED BELOW:

"LOW OIL LEVEL" INDICATOR

THE "LOW OIL LEVEL" INDICATOR GROUND IS CONTROLLED BY THE PCM. THE PCM ALSO SUPPLIES B+ TO THE ENGINE OIL LEVEL SENSOR, MOUNTED IN THE ENGINE OIL PAN. THE PCM WILL NOT CHECK FOR A LOW OIL CONDITION UNTIL THE DROP IN ENGINE COOLANT TEMPERATURE CORRESPONDS WITH THE CHART BELOW. THE PCM COMPARES THE DROP IN COOLANT TEMPERATURE FROM THE LAST IGNITION "OFF" CYCLE TO THE COOLANT TEMPERATURE AT THE START OF THE CURRENT IGNITION "ON" CYCLE.

IF THE COOLANT TEMPERATURE DROP CONDITIONS ARE NOT MET, THE "LOW OIL LEVEL" INDICATOR WILL COME ON FOR THE 2 SECOND BULB TEST ONLY. (THE IGNITION MUST BE "OFF" FOR A MINIMUM OF 5 SECONDS BEFORE THE "LOW OIL LEVEL" INDICATOR CAN COME "ON" AGAIN). IF THE INDICATOR IS "ON" BECAUSE OF A LOW OIL CONDITION, IT WILL REMAIN "ON" FOR THE REST OF THE CURRENT IGNITION CYCLE, EVEN IF OIL IS ADDED TO THE CRANKCASE. A LOW OIL CONDITION EXISTS WITH 2 3/4 OR LESS QUARTS OF OIL REMAINING IN ENGINE OIL PAN.

TEMPERATURE DROP SINCE LAST IGNITION IGNITION "ON" (CELSIUS) "OFF" CYCLE (CELSIUS) ======================= =====================

-40 7 -28 7 -16 7 -4 7 8 7 20 8 32 10 44 12 56 14 68 16 80 19 92 22 104 22 116 22 128 22 140 22 152 22

FIGURES: 00 ATTACHMENTS: 00

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.