- The air filter must be installed.
- The engine must be at operating temperature.
- All fuel system wires and lines must be connected.
- All electrical energy consumers must be switched off.
- All vacuum hoses must be connected correctly.
- All electrical connectors of the fuel injection device must be connected correctly.
- The ignition timing must be set.
- The gearbox must be in neutral.
Make the adjustment as follows:
- Warm up the engine to operating temperature.
- For idle mode, the perfect closing of the additional air valve plays a major role. If the engine does not run well in idle mode, the valve should be checked first. To do this, perform the following work:
— Disconnect the air filter hose from the throttle body.
— Start the engine and close the additional air valve channel with your finger, as shown in Figure 140. The speed should drop by no more than 100 rpm. Otherwise, replace the valve.
— Reconnect the air filter hose.
Fig. 140. Closing the additional air valve channel in the throttle body
- Start the engine again and read the idle speed. It should be 800±50 rpm on a 1.6L engine or 700±50 rpm on a 2.0L engine. If not, turn the adjustment screw in the throttle body. On a 1.6L engine, it is located in the location shown in Figure 141; on a 2.0L engine it is located in the location shown in Figure 142.
Fig. 141. Adjusting the idle speed on the fuel injection device of the 1.6 l engine.
Fig. 142. Adjusting the idle speed on the fuel injection device of a 2.0 l engine without a catalytic converter. Adjustment is made with the screw (1).
The CO content on 1.6 l engines without a catalytic converter is adjusted as follows:
- Connect the CO measuring device in accordance with the manufacturer's operating instructions, start the engine and let it run for approximately 90 seconds at 2500 rpm.
- Insert the measuring probe of the CO measuring device at least 60 cm into the exhaust pipe and take readings 1-3 minutes after the engine accelerates. The reading should be 1.5±0.5%.
- If the reading does not match the specified value, remove the rubber plug in Figure 143 (only on cars without a catalytic converter) and adjust the mixture composition using the variable resistance. The resistance screw can only move 3/4 of a turn. The engine should run normally in idle mode. If this does not happen, there are other faults.
- Take the idle speed readings again and adjust if necessary. In this case, also adjust the CO content.
Fig. 143. Adjusting the CO content using a variable resistance (1.6L engine).
The CO content on 2.0 l engines without a catalytic converter is adjusted as follows:
- Connect the CO measuring device in accordance with the manufacturer's operating instructions.
- Jumper terminals E and T1 on the inside of the small socket shown in Figure 144.
Fig. 144. Insert the jumper (2) into both shown terminals of the test socket (1)
- Start the engine and let it run for approximately 90 seconds at 2500 rpm.
- Insert the measuring probe of the CO measuring device at least 40 cm into the exhaust pipe and take readings 1-3 minutes after the engine accelerates. The reading should be 1.5±0.5%.
- If the reading does not correspond to the specified value, remove the rubber plug in Figure 145 and adjust the mixture composition using the variable । resistance. The resistance screw can only move 3/4 of a turn. The engine should run normally in idle mode. Otherwise, there are other reasons.
Fig. 145. Adjusting screw (1) for adjusting the CO value on a 2.0 l engine without a catalytic converter.
- Check the idle speed again and make the necessary adjustments if necessary. If this does not lead to success, contact a TOYOTA service station, where the entire system can be checked.