Initial Inspection
CHECK FIRST
Switch on ignition.
Read fault code again.
Press and hold test button for at least 5 seconds, then release. LED should light after 3 more seconds.
Press and hold test button for at least 5 seconds, then release. LED should go out.
Check that fault code has been cleared by pressing button once for more than 1 second (but not more than 3 seconds).
Display of flashing code 1-1-1 indicates that fault code has been cleared.
A). ACTION IF ENGINE WILL NOT IDLE:
- Check throttle switch.
- Use diagnostic system test mode 3 to check operation of idling valve.
- If no fault is found, use the following method of increasing the throttle air flow.
Note:
This will, however, also increase the normal deposits on the throttle plate; in time, airflow will be reduced correspondingly and the problems can recur.
Connect a jumper lead between terminals 1 and 2 in the throttle switch wiring connector.
Note:
Ensure good contact is made between the pins. If no signal is obtained, control unit will enter "LIMP-HOME" mode (applies to LH 2.4 only).
Loosen throttle switch by loosening screws slightly.
Idle engine at working temperature with gear selector lever in neutral and AC system off.
Disconnect hose to idling (CIS) valve as follows:
- LH fuel systems: Disconnect idling valve hose at air hose connection. Plug both idling valve hose and hole in air hose, ensuring that both are fully sealed.
- Regina fuel systems: Disconnect idling valve hose at air cleaner. Plug hose.
Throttle Body:
Adjust speed to 500±20 rpm using throttle adjusting screw.
Note:
It is important to maintain speed within these limits.
Switch off engine.
Tighten adjusting screw locknut while holding screw to prevent it rotating.
Remove throttle switch connector jumper.
IMPORTANT:
- Check throttle switch
- Check throttle lever clearance (see item F)
F). ACTION WHEN AC COMPENSATION IS INSUFFICIENT AND ENGINE SPEED DROPS WITH COMPRESSOR ENGAGEMENT:
- Check throttle switch
- Use diagnostic system to check
- that idling (CIS) valve is operating. Use test mode 1 to check that fault code 2-2-3 is not present and test mode 3 to ensure that valve is operating.
- AC compressor on/off function. Use test mode 2 to check that acknowledgment codes 1-1-4 and 1-3-4 are displayed.
for Regina, early system:
Insufficient AC compensation:
Symptom may be noticed during extremely hot weather. In this case, additional bypass air is required. Proceed as follows:
- Disconnect the hose (arrow) from the throttle housing to the EVAP control and connect a vacuum gauge to the connection.
- Idle the engine.
- Measure the vacuum. (Normally, no vacuum should be present at this point.)
- Open the throttle with the adjusting screw until the gauge begins to read a vacuum. Then, close the throttle until the vacuum is again zero.
- Tighten the adjusting screw locknut (holding the screw to prevent it rotating).
- Check the throttle switch
- Check the throttle lever clearance (see item F).
Note:
Throttle Stop Adjustment Screw:
If the 'check engine' (or Lambda symbol) warning lamp lights during engine braking (particularly at high altitude), the bypass air flow may be excessive. In this event, close the throttle gradually with the adjusting screw until the lamp no longer lights under these conditions.
Note:
Remember to clear the 1-2-1 code in the diagnostic system memory after each test.
G). ACTION IN EVENT OF ENGINE SPEED FLUCTUATION DURING FUEL SHUTOFF FUNCTION, OR COASTING DOWNHILL:
- Center throttle plate (see item 1.2).
- Adjust throttle switch:
Install throttle switch without tightening screws.
TPS Adjustment:
Turn switch clockwise. Place 0.15 mm feeler gauge between throttle lever and adjusting screw. Turn switch slowly counterclockwise until "click" is heard. Hold switch in this position and tighten mounting screws (torque: 1.6 +/- 0.4 Nm = 14 +/- 4 in.lb).
Note:
If the throttle switch is of VDO manufacture, apply medium grade locking fluid when tightening the throttle switch screws.
- Recheck operation:
Open throttle slightly, insert feeler gauge between lever and adjusting screw, and check as follows:
With 0.25 mm gauge, click should not be heard from switch when throttle is closed.
With 0.15 mm gauge, click should be heard from switch when throttle is closed.
- Adjust throttle mechanism (see item 1.4).
Note:
The following operations describe standard operations which may be required when adjusting throttle housing and throttle mechanism.