1A-2 Engine Control System Engine Control System Precautions on Service Circuit Test Tools Damage by Electrostatic Discharge Electronic components used in the electronic control system are designed to work at very low voltages and, for this reason, they are susceptible to damage by electrostatic discharge and some types of electronic components may be damaged even by the static electricity of less than 100 V that is usually not sensed by persons. Persons’ sensitivity level is 4,000 V. Persons are electrostatically charged in various ways and the most typical electrification sources are friction and induction. Shown below are examples.
Electrification by friction occurs when a person slides on the seat in the vehicle. Electrification by induction occurs when a person with insulating shoes is standing near a highly electrifiable substance and touches a ground momentarily. Electric charges with the same polarity flow out and resultantly the person is charged at high opposite polarity. Since static electric charges cause damages, it is important when you handle or test electronic components. Unless otherwise specified in diagnostic procedures, do not use Test Light to diagnose the powertrain electrical system. When diagnostic procedures need probe connector, use Connector Test Adapter Kit 5- 8840-0385-0.
On-Market Electrical Equipment and Vacuum Devices On-market electrical equipment and vacuum devices refer to those components that will be installed to vehicles after shipment from manufacturing plants. Be careful that installation of these components is not considered during the process of vehicle design. CAUTION: Do not install on-market vacuum devices to vehicles. CAUTION: Connect on-market electrical equipment, as well as its power supplies and grounds, to the circuits isolated from the electronic control system. CAUTION: To prevent damages by electrostatic discharge, follow the guidelines shown below.
Do not touch ECM connector pins as well as electronic components soldered to the ECM circuit board. Do not unpack each replacement component until preparations are completed for the component. Before taking out a component from the package, connect the package to the normal grounding line of the vehicle. When you intend to slide on the seat, change the posture from standing to sitting, or walk by a certain distance to handle a component, touch an appropriate grounding material. The on-market electrical equipment, even when installed to vehicles in normal manner, may bring functional troubles to the electronic control system.
Affected devices include those not connected to the vehicle electrical equipment system, for example, mobile phones or radios. Therefore, when you intend to diagnose the powertrain, check such the on-market electrical equipment has not been installed to the vehicle and, if installed, remove it. If faults still occur even after removal of on-market electrical equipment, diagnose the vehicle according to normal procedures.
List of Abbreviations Abbreviation Original form Meaning in this manual A/C Air Conditioner Air conditioning units (cooler, heater, etc.) AP Accelerate Position Depressing stroke of accelerator pedal CKP Crankshaft Position Rotating reference signal of crankshaft CMP Camshaft Position Rotating reference signal of pump camshaft DLC Data Link Connector DLC connector (Tech 2 communication connector) DTC Diagnosis Trouble Code DTC code DVM Digital Volt Meter Special service tool (part No. 5-8840-0366-0) ECT Engine Coolant Temperature Coolant temperature ECM Engine Control Modulle Engine control computer EDU Engine Driver Unit Fuel pump spill valve drive unit