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Pretesting Inspection

If ECI system components fail, interruption of fuel supply or failure to supply proper amount of fuel for engine operation will result. The following conditions will result: engine is hard to start or does not start at all, unstable idle and/or poor driveability. Before testing ECI system, perform basic engine checks first (ignition system, incorrect engine adjustments, etc.).

ECI SYSTEM CHECK PROCEDURE CHART

Application Condition Normal Voltage Computer Terminal
Power Supply Ignition switch OFF - ON 11 - 13V B-1
Secondary Air Control SolenoidValve Ignition switch OFF - ST 30 seconds A-10
" After warming up the engine 0.2 - 1V To 13 - 15V A-10
Throttle Position Switch Ignition Switch OFF - ON, Accelerator closed 0.4 - 1.5V A-1
" Ignition Switch OFF - ON, Accelerator wide opened 4.5 - 5.0V A-1
Coolant Temperature Sensor Ignition switch OFF - ON 0°C (32°F) 3.5V A-3
" Ignition switch OFF - ON 20°C (68°F) 2.6V A-3
" Ignition switch OFF - ON 40°C (104°F) 1.8V A-3
" Ignition switch OFF - ON 80°C (176°F) 0.5V A-3
Intake Air Temperature Sensor Ignition switch OFF - ON 0°C (32°F) 3.5V A-4
" Ignition switch OFF - ON 20°C (68°F) 2.6V A-4
" Ignition switch OFF - ON 40°C (104°F) 1.8V A-4
" Ignition switch OFF - ON 80°C (176°F) 0.5V A-4
Idle Position Switch Ignition switch OFF - ON Accelerator closed 0 - 0.4V A-5
" Ignition switch OFF - ON Accelerator wide opened 11 - 13V A-5
ISC motor position switch Ignition switch OFF - ON 11 - 13V (1) A-14
EGR Control Solenoid Valve Ignition switch OFF - ON Return to 0V after 1 seconds. 0 - 0.5V after 1 seconds B-4
ISC Motor for Extension Ignition switch OFF - ON Pointer C swings amoment after 15 seconds B-6
A/C Relay Ignition Switch OFF - ON, A/C switch OFF - ON 11 - 13V B-12
Reed Switch for Vehicle Speed Start engine, transmission in first 0.2 - 1V A-15
" Operate vehicle slowly 4 - 5V A-15
Ignition Pulse Idling 12 - 15V A-8
" 3,000 RPM, When engine speed is increased, voltage drops slightly. 11 - 13 V A-8
Air Flow Sensor Idling 2.7 - 3.2V A-7
" 3,000 RPM 2.7 - 3.2V A-7
ISC Motor for Retraction Ignition switch OFF - ON Pointer swings a moment after 15 seconds B-11
Cranking signal Ignition switch OFF - ST Over 8V A-13
Control Relay Idling 0 - 1V B-5
ISC Motor Position Switch Idling 11 - 13V A-14
Injector No. 1 Idling 13 -15V B-9
" 3,000 RPM, When engine speed is increased, voltage drops slightly. 12 -13V B-9
Injector No. 2 Idling 13 - 15V B-10
" 3,000 RPM, When engine speed is increased, voltage drops slightly. 12 - 13V B-10
Oxygen Sensor Keep 1,300 RPM after warming up the engine Flashing 0 - 1V - 2.7V A-6
EGR Control Solenoid Valve Idling after warming up the engine. Over 3,000 RPM, drops to 0V. 13 - 15V B-4
Pressure Sensor Ignition switch OFF - ON 1.5 - 2.6V A-17
" Idling 0.2 - 1.2V Switches back to 2.0V every 2 min. A-17
ISC Motor for Extension Idling, A/C switch OFF - ON Over 5V (2) B-6
ISC Motor for Retraction Idling, A/C switch ON - OFF Over 6V (2) B-11
(1) If ignition switch is turned on for 15 seconds or more, the reading drops to 1V or less momentarily and returns to 6 to 13V.

(2) It indicates 6V a moment (very short time). If it is difficult to read the indication, repeat to turn the air conditioner switch off and on or on and off several times. If voltmeter swings, the components are in good condition.
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