Home/Buick/Electra Estate Wagon/Buick Electra Estate Wagon (1985-1986)/Repair manual/Feedback Carburetor Tests W/codes/CLEARING TROUBLE CODES

Contents

Section: Feedback Carburetor Tests W/codes

MODEL IDENTIFICATION

DESCRIPTION

ECM Systems Controlled (Outputs)

ECM Operating Conditions Sensed (Inputs)

DIAGNOSTIC SYSTEM OPERATION

BASIC DIAGNOSTIC PROCEDURE

CLEARING TROUBLE CODES

READING TROUBLE CODES

TROUBLE CODE COMPONENT IDENTIFICATION

TROUBLE CODE DETERMINATION (HARD OR INTERMITTENT)

DIAGNOSTIC MATERIALS

DIAGNOSTIC CHARTS

DIAGNOSTIC CIRCUIT CHECK

DIAGNOSTIC SYMPTOM CHECK

SYSTEM PERFORMANCE CHECK (CARBURETED MODELS ONLY)

FIELD SERVICE MODE CHECK (EFI MODELS ONLY)

DIAGNOSTIC TOOLS

SYSTEM PERFORMANCE CHECK

CHART A1 - DWELL FIXED UNDER 10°

CHART A2 - DWELL FIXED BETWEEN 10°-50°

CHART A3 - DWELL FIXED OVER 50°

CHART A5 - "CHECK ENGINE" LIGHT INOPERATIVE

CHART A6 - WON'T FLASH CODE 12

CODE 12 - NO DISTRIBUTOR REFERENCE PULSES

CODE 13 - OPEN OXYGEN SENSOR CIRCUIT

CODE 14 - COOLANT SENSOR SHORTED

CODE 15 - COOLANT SENSOR OPEN

CODE 21 - TPS CIRCUIT HIGH

CODE 22 - TPS CIRCUIT LOW (5.0L VIN Y ONLY)

CODE 23 - M/C SOLENOID CIRCUIT LOW

CODE 24 - VEHICLE SPEED SENSOR (VSS)

VEHICLE SPEED SENSOR (VSS) (MODELS W/ DIGITAL CLUSTER)

VEHICLE SPEED SENSOR (VSS) (MODELS W/ INTEGRAL BUFFER)

FLOW CHART 24B - PARK/NEUTRAL CIRCUIT (P/N)

CODE 32 - BARO SENSOR

CODE 34 - DIFFERENTIAL PRESSURE (VACUUM) SENSOR

CODE 34 - MAP SENSOR CIRCUIT (3.0L & 3.8L ONLY)

CODE 35 - IDLE SPEED CONTROL CIRCUIT (3.0L & 3.8L ONLY)

CODE 41 - NO DISTRIBUTOR REFERENCE SIGNAL

CODE 42 - ELECTRONIC SPARK TIMING (EST)

CODE 43 - ELECTRONIC SPARK CONTROL (ESC)

CODE 44 - LEAN EXHAUST INDICATION

CODE 45 - RICH EXHAUST INDICATION

CODE 51 - FAULTY PROM

CODE 53 - EXHAUST GAS RECIRCULATION (EGR) VACUUM CONTROL

CODE 54 - M/C SOLENOID CIRCUIT HIGH

CHART C1 - ECM REPLACEMENT CHECK CHART

All sections

CLEARING TROUBLE CODES Buick Electra Estate Wagon

Feedback Carburetor Tests W/codes

CLEARING TROUBLE CODES

Turn ignition switch on and ground "TEST" lead at ALDL connector. Turn ignition switch off and remove ECM fuse from fuse block for 10 seconds. Remove "TEST" lead ground.