2. When a malfunction is detected, a warning light comes on on the instrument panel and the electronic control unit switches to the "drive home" mode, which is sufficient to deliver the car to a repair shop.
3. Fault codes can be read from the indicator lamp signals.
Reading fault codes
Normal check mode
1. Warm up the engine to operating temperature.
2. Turn off all additional equipment.
3. Turn on the ignition.
4. Place a jumper across terminals TE1 and E1 of the diagnostic connector.
The material was taken from a resource Toyotaman.ru
Diagnostic connector (type 1)
Diagnostic connector (type 2)
5. The fault code is determined by a series of "tens-units" flashes of the control lamp.
6. For example, the lamp flashes 2 times, then pauses for 1.5 seconds, then flashes 4 times. This means code 24 (intake air temperature sensor).
7. If two or more fault codes are stored in the electronic unit memory, the codes will be separated by a pause of 2.5 seconds.
8. If there are no faults, the indicator lamp should flash at intervals of 0.25 seconds.
Test mode check
Note: the self-diagnostic system enables a more detailed check of the control system by short-circuiting the TE2 and E1 terminals of the diagnostic connector. This test mode for specialists and some of the fault codes listed in the table appear only in this test mode.
This test is more sensitive than the usual one.
It is possible to diagnose starter and air conditioner signals.
1. Verification conditions
- the engine is warmed up to operating temperature;
- the battery is fully charged (voltage not less than 11 V);
- throttle valve closed (throttle Position Sensor IDL Contacts Shorted);
- all additional equipment is turned off.
2. Turn off the ignition.
3. Place a jumper on terminals TE2 and E1 of the diagnostic connector.
4. Turn on the ignition.
Note: Flashing of the check engine light confirms that the test check is on.
5. Start the engine and drive at a speed above 5 km/h.
6. Create conditions for the malfunction to occur (according to the owner).
7. After the test check, short-circuit the terminals TE1 and E1 of the diagnostic connector.
Note: The ignition must be off when shorting the terminals.
8. Read the fault codes.
9. Remove the jumpers from the diagnostic connector.
Note: the test check cannot be started if the jumper is installed on terminals TE2 and E1 with the ignition on.
If the requirements of paragraph 5 are not met, then codes 42 and 43 (starter and vehicle speed signals) will be recorded in memory as a malfunction.
Normally, code 51 will appear when you turn on the air conditioner or remove your foot from the accelerator pedal.
Identifying fault codes
| Code | Location of malfunction |
| 12 | Crankshaft position sensor |
| 13 | Engine speed sensor |
| 14 | Solenoid relay for changing injection advance or fuel pressure |
| 16 | Automatic transmission signal to the electronic control unit |
| 17 | Electronic control unit signal |
| 22 | Engine Coolant Temperature Sensor Signal |
| 24 | Intake Air Temperature Sensor |
| 32 | Fuel injection pump resistor signal |
| 33 | Throttle signal |
| 35 | Boost Pressure Sensor Signal |
| 39 | Fuel temperature sensor signal |
| 41 | Throttle Position Sensor Signal |
| 42 | Vehicle speed sensor signal |
| 43 | Starter signal |
| 51 | Air conditioner switch, neutral switch or throttle position sensor signal |
| 99 | Engine start inhibition system (immobilizer) |
Clearing fault codes
1. Turn off the ignition.
2. Remove the ECU fuse or disconnect the battery for one minute or longer in low temperatures.
Note: Disconnecting the battery will erase the memory of other electronic devices, such as the time in the watch.
3. Road test the vehicle.
4. Repeat the diagnostic procedure and check that there are no fault codes.