Contents: Diagnostics ↳ Diagnostic codes ↳
Diagnostics
The EEC IV system has a self-diagnostic function that facilitates the detection of faults. The diagnostic connector located near the battery makes it possible to connect the STAR tester, which displays diagnostic codes contained in the diagnostic memory of the EEC IV electronic control unit.
To check the contents of the diagnostic memory, connect the STAR tester to the diagnostic connector of the EEC IV system, turn on the tester and read the diagnostic codes. To use the maximum diagnostic capabilities, strictly follow the instructions in the table describing the diagnostic procedure.
EEC IV System Diagnostic Procedure
Procedure | Explanation |
Basic procedure | |
1. Connect the STAR tester to the diagnostic connector. Turn on the tester. Press the tester button. | The diagnostic connector is located near the battery. The indicator should display a control code. If a message appears about discharged batteries, they should be replaced. The code reception symbol should appear. It means that the tester is ready to receive diagnostic signals from the EEC electronic control unit. |
2. Turn on the ignition. Do not start the engine. | After the ignition is turned on, the EEC IV electronic control device switches to the auto-diagnostic mode and after a while is ready for operation. |
3. Read and write down the displayed digital codes of defects. Code "11" or the code of the detected malfunction. | The EEC IV electronic control unit checks the signals from the sensors when the engine is not running and the state of the data converters. Code "11" indicates that the system is in good working order. In the event of a malfunction, the corresponding code will be recorded in the diagnostic memory of the EEC IV electronic control unit, which will display it during the check of the faulty element. |
4. The code is displayed "20". | This is a split code. It separates the codes displayed during the current check from those stored in the diagnostic memory during the other 40 autodiagnostic tests. |
5. Read and write down the displayed digital codes. Code "11" or the code of the detected malfunction. | The displayed codes indicate faults detected during the remaining 40 autodiagnostic tests and are stored in memory.Code "11" means that no fault was detected during the remaining 40 autodiagnostic tests. After the code is displayed, "10" the fault codes are displayed only once and then erased from the diagnostic memory. |
| The fault code is displayed only once and should be written down immediately (it cannot be repeated) | |
6. The code is displayed "10". Move the wire harnesses and their connectors to detect their malfunction. | The electronic control unit EEC IV is in the mode "of unstable control". |
| The results of previous tests are erased from memory. If the LED is blinking, this means that a malfunction has been detected and its code has been recorded in memory. If necessary, the procedure can be repeated with the engine off to display its code. | |
7. Switch off the ignition. Press the STAR tester button. Switch off the tester, but do not disconnect it from the engine diagnostic connector. | |
8. Eliminate any detected faults (see table Troubleshooting). Continue checking after the fault has been corrected. | Eliminate the faults corresponding to the codes indicated in points 4, 6 and 7. The meaning of the codes and methods for troubleshooting - see the table Troubleshooting. After all faults have been eliminated, continue the diagnostic procedure. |
The procedure is ongoing | |
| 1. Connect the STAR tester to the diagnostic connector and turn it on. Press the tester button. | After starting the engine and turning on the tester, the autodiagnostics procedure begins in constant (uninterrupted) mode. Before stabilization, the tester should display the control code. Check whether the battery discharge indicator lights up. If necessary, replace the batteries. The code acceptance symbol should appear. It means that the tester can receive information from the EEC IV electronic control device. |
| 2. After a while, the codes of detected faults will be displayed (they should be written down). Displaying the code "11" means that no faults have been detected. Call up all fault codes several times to make sure | The EEC IV electronic control unit starts checking the sensors. Their parameters must correspond to those recorded in the permanent memory of the EEC IV device. If the tolerance limits are exceeded, the EEC IV device transmits the code of the detected malfunction to the diagnostic tester. The malfunction codes are displayed by the STAR tester. They should be written down. Code "11" means that no faults were found. |
| 3. Press the tester button. Turn off the tester. Turn off the engine. Do not disconnect | |
| 4. Eliminate any detected faults (see table Troubleshooting). | The code numbers listed correspond to typical faults. After all faults have been eliminated, continue |
Procedure with the engine running | |
1. Turn on the STAR diagnostic tester. Press the tester button. | Turn on the tester before starting the engine so that it is ready to work when starting the engine. The tester should show the control code before stabilization. Check whether the low battery indicator lights up. Replace the batteries if necessary. |
2. Turn on the ignition and start the engine after 3 seconds. | You should wait a little after turning on the ignition for the EEC IV electronic control unit to start working. The code acceptance symbol should appear. It means that the tester can receive information from the EEC IV electronic control unit. |
3. The tester should display the code "50". | Code "50" is an identification code and means that the engine is equipped with the European version of the EEC IV electronic control unit. If the code "50" if it does not light up, then you should check the type of electronic control device EEC IV. |
4. Displaying a series of codes of detected faults. If faults are detected, turn off the tester, stop the engine and eliminate the faults. Then repeat the procedure with the engine running. | If codes are displayed indicating that the engine temperature is too low or the automatic transmission gearshift lever is not in neutral, the electronic control unit does not perform further self-diagnosis. |
5. Increasing the engine speed. | The increase in engine speed is caused by the EEC IV electronic control unit at the beginning of the dynamic test sequence. The converters and the output data of the engine operating limit values are checked. The EEC IV electronic control unit tests the controls by simulating various engine operating conditions and then compares the results with the data programmed into the memory. The detected faults are stored in the diagnostic memory of the EEC IV electronic control unit and then transmitted to the diagnostic tester. |
6. The code is displayed "10". Immediately after this code is displayed, you should sharply press the accelerator pedal (the engine speed should quickly go over 2500 rpm). | After the code is displayed "10" the accelerator pedal should be pressed sharply. When the accelerator pedal is pressed, the electronic control unit EEC IV should detect that the speed has exceeded 2500 rpm. |
7. If the code is displayed "44" you should press the STAR button and turn off the engine. Return to operation N1 and repeat the entire procedure from the beginning with the engine running. | Code "44" means that the change in engine speed was not sufficient. |
| If the code "44" does not appear, then you should continue the procedure in accordance with paragraph N8. | |
8. The code is displayed "11" or codes of detected faults. Code "11" means that no faults were detected. Read and write down the displayed fault codes. | The code numbers displayed correspond to the faults detected during this diagnostic procedure. |
9. Eliminate the faults found in the previous operation. Stop the engine, turn off the STAR tester by pressing its button. If no faults are found (code "11"), you should proceed to perform operation N10. | The trouble code table provides the steps to take to correct the detected fault. Once the faults have been corrected, the diagnostic procedure should be repeated with the engine running. |
10. The code appears "60". Proceed to execution of operation N11. | The electronic control unit EEC IV checks the ignition setting. |
| There is no possibility to perform manual adjustment of the ignition timing. | |
11. Press the button on the front wall of the STAR tester, turn off the tester power, disconnect the tester from the engine diagnostic connector. Turn off the engine. | |
Diagnostic codes
Code | Deciphering the fault (code) | Troubleshooting Method |
10 | Control code | Move the wire harnesses, press the accelerator pedal |
11 | No fault code | |
13 | Coolant temperature sensor | See table Troubleshooting |
14 | Incoming air temperature sensor | See table Troubleshooting |
15 | Throttle Position Sensor | See table Troubleshooting |
17 | Absolute pressure sensor | See table Troubleshooting |
18 | Insufficient battery voltage | Check the battery charging circuit |
19 | Memory of the electronic control device EEC IV | See table Checking system elements |
20 | Split code | It separates the codes displayed during the current control from those recorded in the diagnostic memory during the remaining 40 autodiagnostic tests |
21 | Incorrect ignition signal "PIP" | See table Troubleshooting |
23 | Coolant Temperature Sensor - Signal Voltage Too High | See table Troubleshooting |
24 | Inlet Air Temperature Sensor - Signal Voltage Too High | See table Troubleshooting |
25 | Throttle Position Sensor - Signal Voltage Too High | See table Troubleshooting |
27 | Absolute pressure sensor - values too high | |
31 | Electronic control device EEC IV | See table Checking system elements |
33 | Coolant Temperature Sensor - Signal Voltage Too Low | |
34 | Inlet Air Temperature Sensor - Signal Voltage Too Low | See table Troubleshooting |
35 | Throttle Position Sensor - Signal Voltage Too Low | See table Troubleshooting |
37 | Absolute pressure sensor - values too low | See table Troubleshooting |
42 | Absolute Pressure Sensor - No Response to Working Test | See table Troubleshooting |
43 | Throttle Position Sensor - No Response to Run Test | See table Troubleshooting |
44 | Accelerator pedal not pressed - too long response time to sudden change in accelerator pedal position | Repeat the verification procedure |
45 | Damage to the speed sensor | See table Checking system elements |
46 | Idle Speed Control Valve - Maximum RPM Not Reached | See table Troubleshooting |
47 | Idle Speed Control Valve - Minimum RPM Not Reached | Perform the actions as in the case for the code "46" If the problem persists, check the fuel supply pressure and fuel pressure regulator |
48 | Idle Speed Control Valve - Contactor | See table Troubleshooting |
50 | Identification code of the engine with the European version of the electronic control unit EEC IV | – |
57 | During the control process, the accelerator pedal was pressed - too short a response time to a sharp change in the accelerator pedal position | Repeat the entire verification procedure |
60 | Start of the regime operation "Service" sTAR tester | This operation ensures that ignition and idle speed are checked. Since they are completely checked by the EEC IV electronic control unit, no additional check is necessary |
70 | End of the regime's operation "Service" sTAR tester | |
74 | Incorrect shifting of 3rd and 4th gears in automatic transmission | |
75 | Malfunction of the electromagnetic clutch of the hydraulic transmission of the automatic transmission |