Idle Speed: Adjustments
ENGINE TUNE-UPEngine Tune-up Preparation
1. Warm up the engine to normal operating temperature.
2. Shift the transaxle into neutral.
3. Turn off all electrical loads.
- Headlight
- Blower fan
- Rear window defroster
- A/C
4. Verify that the steering wheel is in the straight ahead position.
5. Connect the SST (NGS tester) to the DLC-2 and select "PID DATA MONITOR AND RECORD".
Ignition Timing Inspection
Note: Ignition timing is not adjustable.
1. Perform "Engine Tune-up Preparation".
2. Short the DLC terminal TEN to body GND using a jumper wire.
3. Select the IGT PID.
4. Verify that IGT PID within the specification.
Specification: BTDC 4° - 16° (10° ± 6°)
5. Increase the engine speed and verify the IGT PID value is advanced.
- If it is not advanced, inspect the following.
- CKP sensor and related harness.
- MAF sensor and related harness.
Idle Speed Inspection
Note
- Idle speed is not adjustable.
- The throttle body is not equipped with an air adjust screw (AAS).
1. Perform "Engine Tune-up Preparation".
2. Short the DLC terminal TEN to body GND using a jumper wire.
3. Verify that the RPM PID is within the specification.
- If not as specified with all load conditions, inspect the IAC valve.
- If not as specified with some load condition, inspect the related input switches, harnesses, and connectors.
Specification
*1 Excludes temporary idle speed drop just after the electrical loads (E/L) are turned on.
*2 Headlight is on, Fan switch is above 1st, Cooling fan is operating, Rear window defroster is on.
*3 Steering wheel is fully turned.
*4 A/C switch and fan switch are on.
Idle Mixture Inspection
1. Perform "Engine Tune-up Preparation".
2. Verify that the idle speed and ignition timing are within the specification..
3. Warm up the engine by holding the engine speed at 2500 - 3000 rpm for approx. 3 minutes.
4. Insert an exhaust gas analyzer to the tailpipe.
5. Verify that the CO and HC concentrations are within the specified limits.
- If not within the specified limits, inspect the following:
- On-board diagnostic system.
- H02S.
- Intake manifold vacuum.
- Fuel line pressure.
- Ignition timing control.
- If the systems and devices are normal, replace the TWC.