Fuel Delivery and Air Induction: Testing and Inspection

ENGINE TUNE-UP [FS]
Engine 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 switch
^ Fan switch
^ Rear window defroster switch
^ A/C switch

4. Verify that the steering wheel is at straight ahead position.





5. Connect the SSTs (WDS or equivalent) to the DLC-2.
6. Access RPM PID.
7. Wait until the electrical fan stops.

Ignition Timing Inspection
1. Perform "Engine Tune-up Preparation".
2. Verify that the RPM PID is within the specification.
^ If not as specified, adjust the idle speed.
Specification 650 - 750 (700±50) rpm
3. Connect the timing light to the high-tension lead of the No. 1 cylinder.
4. Verify that the timing mark (yellow) on the crankshaft pulley is within the specification.
^ If not as specified, inspect following.
- CMP sensor
- CKP sensor
- TP sensor
- ECT sensor
- Neutral switch (MTX)
- Clutch switch (MTX)
- TR switch (ATX)
^ If the devices are normal, replace the PCM.

Ignition timing BTDC 9° - 11° (10° - 11°) (TIMING MARK [YELLOW])





5. Connect the SST (System selector) to the DLC.
6. Set switch A to position 1.
7. Set the test switch to SELF TEST.





8. Verify that the timing mark (yellow) on the crankshaft pulley is within the specification.
^ If not as specified, inspect the following.
- CMP sensor
- CKP sensor
- TP sensor
- ECT sensor
- Neutral switch (MTX)
- Clutch switch (MTX)CR)
- TO switch (ATX)
^ If the devices are normal, replace the PCM.

Specification BTDC 6° - 18°

Idle Speed Adjustment
1. Perform "Engine Tune-up Preparation".





2. Verify that the RPM PID is within the specification.
^ If not as specified, adjust the idle speed by turning the AAS.
Specification 650 - 750 (700±50) rpm

Caution:
^ The TAS is set at the factory and must not be adjusted. Any adjustment will negatively effect the engine performance.

3. Connect the SST (System selector) to the DLC.
4. Set switch A to position 1.
5. Set the test switch to SELF TEST.
6. Press CLEAR to clear previously selected items.
7. Disconnect the SSTs.

Idle-up Speed Inspection
1. Perform "Engine Tune-up Preparation".
2. Connect the SST (System selector) to the DLC.
3. Set switch A to position 1.
4. Set the test switch to SELF TEST.
5. Verify that the idle speed is normal.
6. 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. Turn the test mode off.
4. Warm up the engine by holding the engine speed at 2,500 - 3,000 rpm for approximately 3 minutes.
5. Insert an exhaust gas analyzer to the tailpipe.
6. Verify that the CO and HO concentrations are within the specified limits.
^ If not within the specified limits, inspect the following:
- On-board diagnostic system.
- HO2S.
- Intake manifold vacuum
- Fuel line pressure
- Ignition timing control
^ If the systems and devices are normal, replace the TWC.