In the event of a malfunction, first of all, check the electrical wires and their connections, and then check the corresponding element.
Checking system elements
Checked element | Measurement between contacts | Ignition | Meaning | Remarks |
| Connecting the electronic control unit EEC IV to ground | 20" and weight "40" and weight "60" and weight | Turned off | 0 - 2.5 ohm | |
| Octane corrector | "5" and "40" "23" and "40" "24" and "40" | Turned off | The resistance is infinite | Before checking, disconnect the connector from the electronic control unit |
| Diagnostic socket input | "17" and "40" | Turned off | The resistance is infinite | |
| Diagnostic connector output | "48" and "40" | Turned off | The resistance is infinite | |
| Module Power Wire | "37" and "57" | Turned off | 0 - 2.5 ohm | |
| Nozzles N1 and 2 | "37" and "58" | Turned off | 6 - 9 ohm | |
| Nozzles No. 3 and 4 | "37" and "59" | Turned off | 6 - 9 ohm | |
| Injector relay | "37" and "22" | Turned off | 50 - 120 ohm | |
| Idle control valve | "37" and "21" | Turned off | The resistance is infinite | Disconnect the valve before checking |
| valve diode | "21" and "37" | Turned off | 0 - 2 ohm | Disconnect the valve before checking |
| coolant temperature sensor | "7" and "46" | Turned off | 20 - 100 kOhm | Coolant temperature 20°C |
| Intake air temperature sensor | "25" and "46" | Turned off | 15 - 40 kOhm | Temperature 20°- 40°С |
| Throttle position sensor | "47" and "46" "47" and "26" | Turned off | 1.2 - 2 kΩ 3.3 - 5.5 kΩ | |
| TFI IV Ignition Boost Module | "36" and "40" | Turned off | 2 - 5.5 kOhm | |
| TFI IV Ignition Boost Module Grounded | "16" and "40" | Turned off | 0 - 2.5 kOhm | |
| Power supply for the TFI IV ignition booster module | "37" and "40" | Included | 10 - 14 V | |
| Power supply for fuel injectors N1 and 2 | "58" and "40" | Included | 10 - 14 V | |
| Power supply for fuel injectors No. 3 and 4 | "59" and "40" | Included | 10 - 14 V | |
| Fuel pump relay | "22" and "40" | Included | 10 - 14 V | |
| EEC IV memory power supply | "1" and "20" | Included | 10 - 14 V | |
| crankshaft position sensor | "55" and "56" | Included | 200 - 450 ohm | |
Speed sensor | "4" and "40" | Included | 0 - 12 V (changeable) | Spin the rear wheel |
Checking and adjusting idling
Initial conditions
The engine must be warmed up to normal operating temperature. To do this, increase its speed to 2000 rpm and wait for the thermostat valve to open. It is not necessary to warm up the engine at idle speed, since during prolonged operation in these conditions, the CO content in the exhaust gases will differ from the CO content under normal vehicle operating conditions.
The air filter must be installed and its replacement element must not be too dirty.
The ignition system must be in good technical condition.
Additional air must not enter the intake system of the engine through leaky connections, damaged vacuum lines, etc.
The exhaust system of the engine must be sealed.
None of the electrical consumers should be turned on (headlight bulbs, fan motor, heated rear window, etc.).
Checking the number of revolutions
The idle speed in engines equipped with the EEC IV system is regulated by the EEC IV electronic control device and there is no possibility of manual control. For a DOHC engine type N9A, the idle speed should be 875±25 rpm.
CO content adjustment
1. Connect an exhaust gas analyzer.
2. Check the CO content at idle, which for an N9A DOHC engine should be 1.0-1.5%.
3. If necessary, adjust the CO content at idle using the CO content adjustment potentiometer.
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