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Contents

Wiring diagrams Section: Engine Controls - Tests W/codes - 4.3l

MODEL IDENTIFICATION

INTRODUCTION

TERMINOLOGY

SELF-DIAGNOSTIC SYSTEM

HARD FAILURES

INTERMITTENT FAILURES

DIAGNOSTIC PROCEDURE

RETRIEVING CODES (NON-SCAN)

READING TROUBLE CODES

CLEARING TROUBLE CODES

ECM LOCATION

Diagnostic Aids

Field Service Mode Check

SPECIAL TOOLS (DIAGNOSTIC)

SCAN TESTER USAGE

SCAN TESTER DATA

TROUBLE CODE CHARTS

CODE 13, OPEN OXYGEN SENSOR CIRCUIT - ALL MODELS

CODE 14, COOLANT SENSOR SIGNAL VOLTAGE LOW - ALL MODELS

CODE 15, COOLANT SENSOR SIGNAL VOLTAGE HIGH - ALL MODELS

CODE 16, VSS BUFFER FAULT - "S" & "T" SERIES, (VIN W) UTILITY A/T & (VIN Z) PICKUP A/T

CODE 21, TPS SIGNAL VOLTAGE HIGH - ALL MODELS

CODE 22, TPS SIGNAL VOLTAGE LOW - ALL MODELS

CODE 23, INTAKE AIR TEMP. LOW - "L", "M", "S" & "T" SERIES

CODE 24, VSS TRANSMISSION OUTPUT SIGNAL - A/T - ALL MODELS

CODE 25, INTAKE AIR TEMPERATURE HIGH - "L", "M", "S" & "T" SERIES

CODE 28, TRANSMISSION RANGE PRESSURE SWITCH - ALL MODELS

CODE 32, EGR CIRCUIT ERROR BACKPRESSURE EGR WITH SOLENOID - "C", "K" & "P" SERIES

CODE 32, EGR CIRCUIT ERROR WITH EVRV SOLENOID - "C", "G", "K" & "P" SERIES

CODE 32, EGR CIRCUIT ERROR - "L", "M", "S" & "T" SERIES W/ LINEAR EGR

CODE 32, EGR CIRCUIT ERROR - "C", "G" & "K" SERIES W/ LINEAR EGR

CODE 33, MAP SENSOR SIGNAL VOLTAGE HIGH - ALL MODELS

CODE 34, MAP SENSOR SIGNAL VOLTAGE LOW - ALL MODELS

CODE 35, IDLE SPEED ERROR - ALL MODELS

IAC Valve Reset Procedure

System Too Lean

System Too Rich

Throttle Body

IAC Valve Connections

PCV Valve

CODE 36, IDLE SPEED ACTUATOR FAULT - "C", "G", "K" & "P" SERIES A/T

CODES 37/38, TCC BRAKE SWITCH ON/OFF - ALL MODELS A/T

CODE 39, TCC STUCK OFF - "C", "G", "K" & "P" SERIES WITH 4L80-E TRANSMISSION

CODE 42, IGNITION CONTROL - ALL MODELS

CODE 43, KNOCK SENSOR W/O SPARK MODULE (DUAL SENSORS)

CODE 43, KNOCK SENSOR WITHOUT SPARK MODULE (SINGLE SENSOR)

CODE 43, KNOCK SENSOR WITH SPARK CONTROL MODULE "C", "K" & "P" SERIES

CODE 44, LEAN EXHAUST INDICATION - ALL MODELS

O2 Sensor Wire

Fuel Contamination

Fuel Pressure

Exhaust Leaks

CODE 45, RICH EXHAUST INDICATION - ALL MODELS

Fuel Pressure High

Ignition Ground

Fuel Canister

MAP Sensor

TPS

O2 Sensor Contamination

EGR Problem

CODE 51, PROM ERROR (FAULTY OR INCORRECT PROM)

CODE 52, FAULTY CALPAK

CODE 52/53, SYSTEM VOLTAGE HIGH - ALL MODELS

CODE 54, FUEL PUMP CIRCUIT - ALL MODELS

CODE 55, ECM/PCM ERROR

CODE 58, TRANSMISSION FLUID TEMPERATURE HIGH - ALL MODELS

CODE 59, TRANSMISSION FLUID TEMPERATURE LOW - ALL MODELS

CODE 66, 3-2 CONTROL SOLENOID CKT FAULT 4L60-E TRANSMISSION

CODE 67, TCC SOLENOID CIRCUIT CHECK - 4L60-E TRANSMISSION

CODE 68, OVERDRIVE RATIO ERROR - 4L80-E TRANSMISSION

CODE 69, TORQUE CONVERTER CLUTCH STUCK ON 4L60-E TRANSMISSION

CODE 69, TORQUE CONVERTER CLUTCH STUCK ON 4L80-E TRANSMISSION

CODE 72, VSS CIRCUIT LOSS TRANS OUTPUT SIGNAL - ALL MODELS

CODE 73, PRESSURE CONTROL SOLENOID (CURRENT ERROR) - ALL MODELS

CODE 74, TRANSMISSION INPUT SPEED ERROR 4L80-E TRANSMISSION

CODE 75, SYSTEM VOLTAGE LOW - ALL MODELS

CODE 79, TRANSMISSION FLUID TEMPERATURE HIGH - ALL MODELS

CODE 81, TRANSMISSION 2-3 ERROR - ALL MODELS

CODE 82, TRANSMISSION 1-2 ERROR - ALL MODELS

CODE 83, TCC SOLENOID CIRCUIT FAULT - ALL MODELS

CODE 85, UNDEFINED GEAR RATIO - ALL MODELS

CODE 86, LOW GEAR RATIO ERROR - ALL MODELS

CODE 87, HIGH GEAR RATIO ERROR - ALL MODELS

CODE P0106, MAP SENSOR RANGE PROBLEM - "S" & "T" SERIES 4.3L (VIN W)

CODE P0107, MAP SENSOR CKT - "S" & "T" SERIES 4.3L (VIN W)

Intermittents

Sensor Accuracy

CODE P0108, MAP SENSOR CKT - "S" & "T" SERIES 4.3L (VIN W)

CODE P0112, IAT SENSOR CIRCUIT LOW INPUT - "S" & "T" SERIES 4.3L (VIN W)

Poor Connection Or Damaged Harness

Intermittent Test

CODE P0113, IAT SENSOR CIRCUIT HIGH INPUT - "S" & "T" SERIES 4.3L (VIN W)

CODE P0117, COOLANT TEMPERATURE SENSOR TEMPERATURE LOW "S" & "T" SERIES 4.3L (VIN W)

CODE P0118, COOLANT TEMPERATURE SENSOR TEMPERATURE HIGH "S" & "T" SERIES 4.3L (VIN W)

CODE P0121, TP SENSOR RANGE/PERFORMANCE PROBLEM "S" & "T" SERIES 4.3L (VIN W)

CODE P0122, THROTTLE POSITION SENSOR SIGNAL LOW "S" & "T" SERIES 4.3L (VIN W)

CODE P0123, THROTTLE POSITION SENSOR SIGNAL HIGH "S" & "T" SERIES 4.3L (VIN W)

CODE P0123, THROTTLE POSITION SENSOR SIGNAL HIGH 4.3L "S" & "T" SERIES (VIN Z)

CODE P0125, COOLANT SENSOR EXCESSIVE TIME TO CLOSED LOOP "S" & "T" SERIES 4.3L (VIN W)

CODE P0131, HEATED OXYGEN SENSOR LOW SIGNAL VOLTAGE (LEAN) "S" & "T" SERIES 4.3L (VIN W)

CODE P0132, HEATED O2 SENSOR HIGH SIGNAL VOLTAGE (RICH) "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 1

CODE P0133, HEATED OXYGEN SENSOR SLOW RESPONSE

CODE P0134, HEATED OXYGEN SENSOR OPEN CIRCUIT - "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 1

CODE P0135, HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 1

CODE P0137, HEATED OXYGEN SENSOR LOW SIGNAL VOLTAGE (LEAN) "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 2

CODE P0138, HEATED OXYGEN SENSOR HIGH SIGNAL VOLTAGE (RICH) "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 2

CODE P0139, HEATED OXYGEN SENSOR OPEN CIRCUIT "S" & "T" SERIES 4.3L (VIN Z) BANK 1, SENSOR 2

CODE P0140, HEATED OXYGEN SENSOR OPEN CIRCUIT "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 2

CODE P0141, HEATED OXYGEN SENSOR HEATER CIRCUIT MALFUNCTION "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 2

CODE P0171, FUEL TRIM LEAN - "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 1

CODE P0171, LEAN EXHAUST - "S" & "T" SERIES 4.3L (VIN Z)

CODE P0172, FUEL TRIM RICH - "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 1

CODE P0172, RICH EXHAUST - "S" & "T" SERIES 4.3L (VIN Z)

CODE P0300, RANDOM MISFIRE DETECTED - "S" & "T" SERIES 4.3L (VIN W)

CODE P0301-306, CYLINDERS 1-6 MISFIRING - "S" & "T" SERIES 4.3L (VIN W)

CODE P0320, IGNITION CONTROL ERROR - "S" & "T" SERIES 4.3L (VIN Z)

CODE P0325/326, KNOCK SENSOR OPEN OR SHORTED "S" & "T" SERIES 4.3L (VIN W)

CODE P0327, KNOCK SENSOR GROUNDED - "S" & "T" SERIES 4.3L (VIN Z)

CODE P0328, KNOCK SENSOR OPEN - "S" & "T" SERIES 4.3L (VIN Z)

CODE P0337/338, CRANK SENSOR INPUT - "S" & "T" SERIES 4.3L (VIN W)

CODE P0340, CAM SENSOR MALFUNCTION - "S" & "T" SERIES 4.3L (VIN W)

CODE P0341, CAM SENSOR RANGE - "S" & "T" SERIES 4.3L (VIN W)

CODE P0400, EGR ERROR - "S" & "T" SERIES 4.3L (VIN Z)

CODE P0401, EGR FLOW TEST FAILURE - "S" & "T" SERIES 4.3L (VIN W)

CODE P0420, CATALYST EFFICIENCY LOW (BANK 1)

CODE P0441, INCORRECT EVAP PURGE - "S" & "T" SERIES 4.3L (VIN W)

CODE P0500, VSS CIRCUIT - "S" & "T" SERIES

CODES P0502/P0503, VSS CIRCUIT LOW/HIGH - "S" & "T" SERIES 4.3L (VIN W)

CODE, P0506/507 IAC COUNTS LOW/HIGH - "S" & "T" SERIES 4.3L (VIN W)

CODE 560, SYSTEM VOLTAGE MALFUNCTION - "S" & "T" SERIES 4.3L (VIN W)

CODE P0703 - TCC BRAKE INPUT CIRCUIT "S" & "T" SERIES 4.3L (VIN W)

CODE P0712, TRANSAXLE TEMPERATURE SENSOR SIGNAL VOLTAGE LOW "S" & "T" SERIES 4.3L (VIN W)

CODE P0713, TRANSAXLE TEMPERATURE SENSOR SIGNAL VOLTAGE HIGH "S" & "T" SERIES 4.3L (VIN W)

CODE P0742, TCC STUCK ON - "S" & "T" SERIES 4.3L (VIN W)

CODE P0748, PRESSURE CONTROL SOLENOID - "S" & "T" SERIES 4.3L (VIN W)

CODE P0753, 1-2 SHIFT SOLENOID - "S" & "T" SERIES 4.3L (VIN W)

CODE P0756, 2-3 SHIFT SOLENOID PERFORMANCE - "S" & "T" SERIES 4.3L (VIN W)

CODE P0758, 2-3 SHIFT SOLENOID ELECTRICAL "S" & "T" SERIES 4.3L (VIN W)

CODE P1106, MAP INTERMITTENT HIGH - "S" & "T" SERIES 4.3L (VIN W)

CODE P1107, MAP INTERMITTENT LOW - "S" & "T" SERIES 4.3L (VIN W)

CODE P1111, IAT INTERMITTENT HIGH - "S" & "T" SERIES 4.3L (VIN W)

CODE P1112, IAT INTERMITTENT LOW - "S" & "T" SERIES 4.3L (VIN W)

CODE P1114, ECT INTERMITTENT LOW - "S" & "T" SERIES 4.3L (VIN W)

CODE P1115, ECT INTERMITTENT HIGH - "S" & "T" SERIES 4.3L (VIN W)

CODE P1121, TP SENSOR INTERMITTENT HIGH - "S" & "T" SERIES 4.3L (VIN W)

CODE P1122, TP SENSOR INTERMITTENT LOW - "S" & "T" SERIES 4.3L (VIN W)

CODE P1133, OXYGEN SENSOR INSUFFICIENT ACTIVITY "S" & "T" SERIES 4.3L (VIN W) BANK 1, SENSOR 1

CODE P1221, FUEL PUMP SECONDARY SYSTEM CIRCUIT LOW "S" & "T" SERIES 4.3L (VIN W)

CODE P1222, FUEL PUMP VOLTAGE LOW - "S" & "T" SERIES 4.3L (VIN Z)

CODE P1345, CRANKSHAFT/CAMSHAFT SENSOR CORRELATION ERROR "S" & "T" SERIES 4.3L (VIN W)

CODE P1351, EST OUTPUT HIGH - "S" & "T" SERIES 4.3L (VIN W)

CODE P1361, EST NOT TOGGLING - "S" & "T" SERIES 4.3L (VIN W)

CODE P1406, EGR VALVE PINTLE POSITION - "S" & "T" SERIES 4.3L (VIN W) (1 OF 2)

CODE P1406, EGR VALVE PINTLE POSITION - "S" & "T" SERIES 4.3L (VIN W) (2 OF 2)

CODE P1441, EVAPORATIVE SYSTEM CONTINUOUS PURGE "S" & "T" SERIES 4.3L (VIN W)

CODE P1442, EVAPORATIVE SYSTEM VACUUM SWITCH STATIC TEST MALFUNCTION - "S" & "T" SERIES 4.3L (VIN W)

CODE P1508/1509, IDLE SPEED LOW/HIGH - "S" & "T" SERIES 4.3L (VIN W)

CODE P1632, SYSTEM VOLTAGE HIGH - "S" & "T" SERIES 4.3L (VIN Z)

CODE P1810, TRANSMISSION RANGE SWITCH ASSEMBLY CIRCUIT "S" & "T" SERIES 4.3L (VIN W)

CODE P1812, TRANS FLUID OVERTEMP - "S" & "T" SERIES 4.3L (VIN W)

CODE P1860, TCC PWM SOLENOID ELECTRICAL CIRCUIT "S" & "T" SERIES 4.3L (VIN W)

CODE P1864, TCC SOLENOID ELECTRICAL CIRCUIT "S" & "T" SERIES 4.3L (VIN W)

CODE P1870, TRANSMISSION COMPONENT SLIPPING "S" & "T" SERIES 4.3L (VIN W)

CODE P1886, 3-2 SOLENOID ELECTRICAL CIRCUIT "S" & "T" SERIES 4.3L (VIN W)

SUMMARY

All sections

Throttle Body Chevrolet Astro I

Engine Controls - Tests W/codes - 4.3l

Throttle Body

Remove IAC and inspect bore for evidence of IAC valve dragging.