Home/Chevrolet/Camaro/Chevrolet Camaro IV (1992-1998)/Repair manual/Engine Controls - Tests W/codes - 5.7l/CODE 16, OPTI-SPARK IGNITION SYSTEM LOW RESOLUTION PULSE

Contents

Wiring diagrams Section: Engine Controls - Tests W/codes - 5.7l

INTRODUCTION

SELF-DIAGNOSTIC SYSTEM

HARD FAILURES

INTERMITTENT FAILURES

DIAGNOSTIC PROCEDURE

READING TROUBLE CODES

TROUBLE CODE DEFINITIONS

HARD OR INTERMITTENT TROUBLE CODE DETERMINATION

CLEARING TROUBLE CODES

PCM LOCATION

Diagnostic Aids

Field Service Mode Check (If Available)

SPECIAL TOOLS (DIAGNOSTIC)

SCAN TESTER USAGE

SCAN DATA

ECM/PCM CODE CHARTS

CODE 11, MALFUNCTION INDICATOR LIGHT

CODE 13, OPEN OXYGEN SENSOR CIRCUIT

CODE 14, COOLANT TEMP SENS SGNL VLTGE LOW (HI TEMP INDICATED)

CODE 15, COOLANT TEMP SENSOR SIGNAL VOLTAGE LOW

CODE 16, OPTI-SPARK IGNITION SYSTEM LOW RESOLUTION PULSE

CODE 18, INJECTOR CIRCUIT

CODE 21, THROTTLE POSITION SENSOR SIGNAL VOLTAGE HIGH

CODE 22, THROTTLE POSITION SENSOR SIGNAL VOLTAGE LOW

CODE 23, IAT SENSOR SIGNAL VOLTAGE HIGH (LOW TEMP INDICATED)

CODE 24, VEHICLE SPEED SENSOR

CODE 25, IAT SENSOR SIGNAL VOLTAGE LOW (HIGH TEMP INDICATED)

CODE 26, CANISTER PURGE SOLENOID

CODE 27, EGR SOL VALVE

CODE 28, TRANS. RANGE PRESSURE SWITCH

CODE 29, SECONDARY AIR INJECTION

CODE 32, EGR SYSTEM ERROR

CODE 33, MAP SENSOR SIGNAL VOLTAGE HIGH

CODE 34, MAP SENSOR SIGNAL VOLTAGE LOW

CODE 36, OPTI-SPARK HIGH RESOLUTION PULSE

CODE 37, TCC BRAKE SWITCH ERROR

CODE 38, BRAKE SWITCH ERROR

CODE 41, OPTI-SPARK IGNITION SYSTEM OPEN OR SHORTED EST CIRCUIT

CODE 42, IC CIRCUIT GROUNDED

CODE 43, KNOCK SENSOR CIRCUIT (DUAL SENSORS)

CODE 44, LEAN EXHAUST INDICATION

O2 Sensor Wire

Fuel Contamination

Fuel Pressure

Exhaust Leaks

Misfire Or Stall

CODE 45, RICH EXHAUST INDICATION

Fuel Pressure High

Ignition Ground

Evaporative Fuel Canister

MAP Sensor

TPS

O2 Sensor Contamination

EGR Problem

CODE 46, PASS-KEY CIRCUIT

Pass-Key Diagnosis

CODE 47, KNOCK SENSOR MODULE

CODE 48, MASS AIRFLOW SENSOR

CODE 50, SYSTEM VOLTAGE LOW

CODE 52, FAULTY CAL-PAK

CODE 53, SYSTEM VOLTAGE HIGH

CODE 55, PCM ERROR

CODE 55, FUEL LEAN MONITOR

CODE 58, TRANS TEMPERATURE SENSOR HIGH TEMPERATURE

CODE 59, TRANS. TEMPERATURE SENSOR LOW TEMPERATURE

CODE 61, A/C SYSTEM PERFORMANCE

CODE 66, A/C PRESSURE SENSOR

CODE 67, A/C PRESSURE SENSOR

CODE 68, A/C RELAY CIRCUIT SHORTED

CODE 69, A/C COMPRESSOR RELAY

CODE 70, A/C COMPRESSOR RELAY DRIVER

CODE 71, A/C TEMPERATURE (CIRCUIT OPEN OR SHORTED)

CODE 72, VEHICLE SPEED SENSOR LOSS

CODE 73, PRESSURE CONTROL SOLENOID

CODE 74, TRACTION CONTROL VOLTAGE LOW

CODE 75, TRANSMISSION VOLTAGE LOW

CODE 77, PRIMARY COOLING FAN DRIVER

CODE 78, SECONDARY COOLING FAN DRIVER

CODE 79, TRANSMISSION FLUID OVERTEMP

CODE 81, 2-3 SHIFT SOLENOID

CODE 82, 1-2 SHIFT SOLENOID

CODE 83, REVERSE INHIBIT SOLENOID - M/T

CODE 83, TCC PWM SOLENOID - A/T

CODE 84, SKIP SHIFT SOLENOID - M/T

CODE 84, 3-2 CONTROL SOLENOID

CODE 85, TCC STUCK ON

CODE 90, TCC SOLENOID CIRCUIT

CODE 91, SKIP SHIFT LIGHT

CODE 95, CHANGE OIL LIGHT

CODE 96, LOW OIL LIGHT

CODE 97, VSS OUTPUT CIRCUIT

CODE 99 TACH OUTPUT CIRCUIT

SUMMARY

All sections

CODE 16, OPTI-SPARK IGNITION SYSTEM LOW RESOLUTION PULSE Chevrolet Camaro IV

Engine Controls - Tests W/codes - 5.7l 2 illustrations ~252 words

CODE 16, OPTI-SPARK IGNITION SYSTEM LOW RESOLUTION PULSE

Ignition system supplies 2 timing inputs to PCM, a high resolution signal (360 pulses per camshaft revolution) and a low resolution signal (4 pulses per camshaft revolution). PCM can determine if either timing input is not being received by comparing inputs. If PCM detects high resolution pulse without detecting low pulse, Code 16 will set. Reference signal on resolution line toggles between zero and 5 volts as camshaft turns.

Note. Test numbers refer to numbers on diagnostic chart.

If engine starts at this time, code is intermittent.
This step determines if PCM is sending out a signal to distributor for processing. If this signal is not available or is shorted to ground or voltage, distributor cannot ground it to produce reference pulses.
If Code 41 and/or 42 is also set with Code 16 and no external fault can be found, replace PCM. If only Code 16 is set and distributor connections are okay, replace distributor.

An open, a short to voltage, a short to ground or a defective sensor inside distributor can prevent reference voltage from pulsing at PCM resolution terminal. If Code 16 does not reset and vehicle still does not start, go to NO START - ENGINE CRANKS OKAY in BASIC TESTING - 3.4L/5.7L article in this section.

Code 16 Schematic (5.7L) Opti-spark Ignition System Low Resolution Pulse. Scheme 80

Scheme 80: Code 16 Schematic (5.7L) Opti-spark Ignition System Low Resolution Pulse

Scheme 80: Code 16 Schematic (5.7L) Opti-spark Ignition System Low Resolution Pulse

Code 16 Diagnostic Flow Chart (5.7L) Opti-spark Ignition System Low Resolution Pulse. Scheme 81

Scheme 81: Code 16 Diagnostic Flow Chart (5.7L) Opti-spark Ignition System Low Resolution Pulse

Scheme 81: Code 16 Diagnostic Flow Chart (5.7L) Opti-spark Ignition System Low Resolution Pulse