Home/Buick/Skylark/Buick Skylark VI (1986-1992)/Repair manual/3.3l/3.8l Component Tests/DIAGNOSIS & TESTING

Contents

Section: 3.3l/3.8l Component Tests

DIAGNOSIS & TESTING

MODEL IDENTIFICATION

DESCRIPTION

BASIC DIAGNOSTIC PROCEDURE

DIAGNOSTIC MATERIALS

DIAGNOSTIC CHARTS

DIAGNOSTIC AIDS

FIELD SERVICE MODE CHECK (FUEL INJECTED MODELS)

SPECIAL DIAGNOSTIC TOOLS

SCAN TESTER USAGE

SCAN TESTER - TEST DATA PARAMETERS

ECM TERMINAL ID (3.3L VIN N, "A" BODY)

ECM TERMINAL ID (3.3L VIN N, "N" BODY)

ECM TERMINAL ID (3.3L VIN C, "C" & "H" BODIES)

DIAGNOSTIC CIRCUIT CHECK

CHART A3 - ENGINE CRANKS BUT WON'T RUN

3.3L (2 OF 2)

CHART A5 - FUEL SYSTEM ELECT. TEST (3.3L, "A" BODY)

CHART A5 - FUEL SYSTEM ELECT. TEST

Additional Checks

CHART A5 - FUEL SYSTEM ELECTRICAL TEST

CHART A7 - FUEL PRESSURE TEST (3.3L "A" BODY)

FUEL PRESSURE TEST (2 OF 3) (3.3L "A" BODY)

Installation

Removal

CHART A7 - FUEL PRESSURE TEST (3.3L "N" BODY)

CHART A7 - FUEL PRESSURE TEST (3.8L "C" & "H" BODIES)

CHART B1 - RESTRICTED EXHAUST SYSTEM CHECK

CHECK AT O2 SENSOR

Diagnosis

CHART C2A - INJECTOR BALANCE TEST

CHART C2B - IDLE AIR CONTROL (3.3L)

CHART C2B - IDLE AIR CONTROL (3.8L)

CHART C3 - CANISTER PURGE CHECK

CHART C4H1 - C3I MISFIRE AT IDLE (3.3L)

CHART C4H2 - C3I MISFIRE UNDER LOAD (3.3L)

CHART C4F1 - C3I MISFIRE AT IDLE (3.8L "C" & "H" BODIES)

CHART C4F2 - C3I MISFIRE UNDER LOAD (3.8L "C" & "H" BODIES)

CHART C5 - ELECTRONIC SPARK CONTROL (ESC)

CHART C7 - EXHAUST GAS RECIRCULATION (3.8L)

CHART C8 - TORQUE CONVERTER CLUTCH

CHART C8B - TORQUE CONVERTER CLUTCH

3.3L "A" BODY WITH 440-T4 TRANSMISSION (2 OF 2)

CHART C8A - TORQUE CONVERTER CLUTCH

TCC - 3.8L WITH 440-T4 TRANSMISSION (2 OF 2)

CHART C10 - A/C CLUTCH CONTROL

3.3L "A" BODY (2 OF 2)

CHART C10 - A/C CLUTCH CONTROL (3.3L "N" BODY)

CHART C10A - A/C CLUTCH CONTROL

3.8L "C" & "H" BODIES (2 OF 2)

CHART C12A - COOLING FAN FUNCTIONAL CHECK (3.3L "A" BODY)

CHART C12B - NO COOLING FAN(S) (3.3L "A" BODY)

CHART C12C - COOLING FAN(S) ALWAYS ON (3.3L "A" BODY)

CHART C12A - COOLING FAN FUNCTIONAL CHECK (3.3L "N" BODY)

CHART C12B - NO COOLING FAN (3.3L "N" BODY)

CHART C12C - COOLING FAN ALWAYS ON (3.3L "N" BODY)

CHART C12A - COOLING FAN FUNCTIONAL CHECK (3.8L)

CHART C12B - COOLING FAN ALWAYS ON (3.8L)

CHART C12C - NO LOW SPEED COOLING FAN (3.8L)

CHART C12D - NO HIGH SPEED COOLING FAN (3.8L)

All sections

DIAGNOSIS & TESTING Buick Skylark VI

3.3l/3.8l Component Tests

DIAGNOSIS & TESTING

Note. The following conditions must be met before testing: Engine at operating temperature. Engine in closed loop operation. Engine idling ("Engine Run" column). Test terminal NOT grounded. Scanner or ALDL tool NOT installed.