Home/Pontiac/Sunbird/Pontiac Sunbird II (1981-1988)/Repair manual/1.8l Turbo Tests W/codes/CODE 55 - REPLACE ECM

Contents

Section: 1.8l Turbo 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

FIELD SERVICE MODE CHECK (EFI MODELS ONLY)

DIAGNOSTIC TOOLS

CHART A1 - NO "CHECK ENGINE" LIGHT

CHART A2 - WON'T FLASH CODE 12 ("CHECK ENGINE" LIGHT ON)

CHART A3 - ENGINE CRANKS BUT WILL NOT RUN

CHART A4 - ENGINE CRANKS BUT WILL NOT RUN (CONT.)

CHART A5 - ENGINE CRANKS BUT WILL NOT RUN (CONT.)

CHART A6 - ENGINE CRANKS BUT WILL NOT RUN (CONT.)

CHART A7 - FUEL SYSTEM DIAGNOSIS

CHART A8 - FUEL INJECTION

CODE 13 - OPEN OXYGEN SENSOR CIRCUIT

CODE 14 - COOLANT SENSOR SIGNAL VOLTAGE LOW

CODE 15 - COOLANT SENSOR SIGNAL VOLTAGE HIGH

CODE 21 - TPS SIGNAL VOLTAGE HIGH

CODE 22 - TPS SIGNAL VOLTAGE LOW

CODE 23 - MAT SENSOR SIGNAL VOLTAGE HIGH

CODE 24 - VEHICLE SPEED SENSOR (VSS) (INTEGRAL BUFFER)

CODE 25 - MAT SENSOR SIGNAL VOLTAGE LOW

CODE 31 - WASTEGATE OVERBOOST & FUNCTIONAL CHECK

CODE 33 - MAP SENSOR SIGNAL VOLTAGE HIGH

CODE 34 - MAP SENSOR SIGNAL VOLTAGE LOW

CODE 42 - ELECTRONIC SPARK TIMING (EST)

CODE 43 - ELECTRONIC SPARK CONTROL

CODE 44 - LEAN EXHAUST INDICATION

CODE 45 - RICH EXHAUST INDICATION

CODE 51 - PROM FAILURE

CODE 55 - REPLACE ECM

CHART C1 - ECM REPLACEMENT CHECK CHART

All sections

CODE 55 - REPLACE ECM Pontiac Sunbird II

1.8l Turbo Tests W/codes

CODE 55 - REPLACE ECM

Clear codes and confirm "CLOSED LOOP" operation and no "CHECK ENGINE" Light.