#
ENGINE TUNE-UP [AJ]

BME011002000213

## Engine Tune-up Preparation

1. Turn off the electrical loads.

2. Warm up the engine as follows.

  (1) Start the engine.
  (2) Maintain the engine speed at approx. 3,000 rpm until the cooling fans start to operate.
  (3) Release the accelerator pedal.
  (4) Wait until the cooling fans stop.

3. Connect the WDS or equivalent to the DLC-2.

## Ignition Timing Inspection

  Note

  • Ignition timing is not adjustable.
  • Ignition timing verification requires WDS or equivalent.

1. Verify that the ignition timing (WDS: SPARKADV PID) is within the specification using WDS or equivalent.

Ignition timing

  Approx. BTDC 10 degree

2. Verify that ingestion timing advances when the engine speed increases gradually.

## Idle Speed Inspection

  Note

  • Idle speed is not adjustable.
  • Idle speed verification requires WDS or equivalent.

1. Verify that the idle speed (WDS: RPM PID) is within the specification using WDS or equivalent.

Idle speed

Condition | Engine speed (rpm)*1
--- | ---
No load | 635-735
Electrical loads*2 ON | 635-735
P/S ON | 700-800
A/C ON and refrigerant pressure switch (middle) OFF | 650-750
A/C ON and refrigerant pressure switch (middle) ON | 650-750

  *1 :
Excludes temporary idle speed drop just after the electrical loads are turned on.
  *2 :
Blower motor is operating at high speed. Headlight switch is turned on. Rear window defroster switch is turned on. Cooling fans are operating.

## Idle Mixture Inspection

1. Verify that the idle speed and ignition timing are within the specification.

2. Insert an exhaust gas analyzer to the tailpipe.

3. Verify that the CO and HC concentrations are within the regulation.