ECI System Inspection
- Turn ignition off. Remove harness connectors "A" and "B" from ECU. Make sure to press down on harness connector lock when connecting or disconnecting harness connector. Turn ECI system checker check switch to "OFF" position.
- Set select switch of checker to A. Connect the adapter to the connectors of ECI checker, and connect adapter to carburetor control unit and harness connectors. Place ECI checker on front passenger's seat. Monitor operating condition should be as follows: Air flow sensor ON, Injector Pulse OFF, and Oxygen sensor OFF. Perform checks listed in check chart.
- If checker shows any departure from specifications, check corresponding sensor and related electrical wiring and repair or replace as necessary. Recheck with ECI checker.NOTE: During checks 1 through 12, finish each step quickly and switch off ignition after each step to save current consumption and protect battery.
- Air flow sensor and injector pulse may be inspected by output monitors. With checker select switch set to "B", output monitor for air flow sensor light should be ON, injector pulse output monitor light should be ON, and oxygen sensor output monitor should be flashing at closed loop zone.
ECI SYSTEM CHECK PROCEDURE CHART - SELECT SWITCH POSITION A
| Check Switch Position; Check Item | Condition | Normal Voltmeter Reading | ECU Term No. |
|---|---|---|---|
| 1; Power Supply | Ignition switch OFF - ON | 11 - 13V | A-7 |
| 2; Distributor Advance Vacuum Exchange Solenoid Valve | Idling | 13 - 15V | B-7 |
| " | 2,000 RPM | 0 - 1V | A-7 |
| 3; Throttle Position Sensor | Ignition Switch OFF - ONAccelerator closed | 0-0.6V | A-13 |
| " | Ignition Switch OFF - ONAccelerator wide opened | 4 - 4.5V | A-13 |
| 4; Coolant TemperatureSensor | Ignition switch OFF - ON20°C (68°F) | 2.4 - 2.6V | A-12 |
| " | Ignition switch OFF - ON40°C (104°F) | 1.4 - 1.6V | A-12 |
| " | Ignition switch OFF - ON80°C (176°F) | 0.5 - 0.7V | A-12 |
| 5; Intake Air Temperature Sensor | Ignition switch OFF - ON20°C (68°F) | 2.4 - 2.6V | A-4 |
| " | Ignition switch OFF - ON40°C (104°F) | 1.4 - 1.6V | A-4 |
| " | Ignition switch OFF - ON80°C (176°F) | 0.5 - 0.7V | A-4 |
| 6; Vacuum Switch | Ignition switch OFF - ON | N/A | A-5 |
| " | Idling | N/A | A-5 |
| 7; Idle Up Control Solenoid Valve | Ignition switch OFF - ON | 0 - 0.6V | B-3 |
| 8; Enrichment Solenoid Valve | Ignition switch OFF - ON | 11 - 13V | B-54 |
| 9; A/C Cut Relay | Ignition switch OFF - ONA/C Switch OFF - ON | 0 - 0.6V | B-6 |
| 10; Power Supply for Sensor | Ignition switch OFF - ON | 5V | A-3 |
| 11; N/A | N/A | N/A | N/A |
| 12; Secondary Air Control Solenoid Valve | Ignition switch OFF - ONCoolant temperature 30-40°C (86-104°F) | 0-0.6V | B-4 |
ECI SYSTEM CHECK PROCEDURE CHART - SELECT SWITCH POSITION B
| Check Switch Position; Check Item | Condition | Normal Voltmeter Reading | ECU Term No. |
|---|---|---|---|
| 1; N/A | N/A | N/A | N/A |
| 2; Jet Mixture Solenoid Valve | Ignition switch OFF - ON | 11 - 13V | B-1 |
| " | Idling | N/A | B-1 |
| 3; Idle Up Control Solenoid Valve | Keep 1,500 RPM | 13 - 15V | B-3 |
| 4; Ignition Pulse | Idling | 12 - 15V | A-10 |
| " | 3,000 RPM | 11 - 13V | A-10 |
| 5; N/A | N/A | N/A | N/A |
| 6; Power Supply for Back Up | Idling | 13 - 15V | A-9 |
| 7; Deceleration Solenoid Valve | Idling | 0-0.6V | B-2 |
| 8; Oxygen Sensor | Keep 1,300 RPM after warming up | 0.4-1V Flashing 2.7V | A-1 |
| 9; Enrichment solenoid Valve | N/A | N/A | B-5 |
| 10; N/A | N/A | N/A | N/A |
| 11; A/C Cut Relay | Ignition switch OFF - ONA/C switch OFF - ON at accel. wide opened | 11 - 13V | B-6 |
| 12; Secondary Air Control Solenoid Valve | Keep idling after warming up | 11 - 13V | B-4 |