ENGINE TUNE-UP [LF]

Engine Tune-up Preparation

1. Turn off all electrical loads.

2. Warm up the engine as follows.

(1) Start the engine.

(2) Maintain the engine speed 2,500-3,000 rpm until the cooling fans start to operate.

(3) Release the accelerator pedal.

(4) Wait until the cooling fans stop.

3. Connect the SST (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 8°

2. Verify that ignition 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
	MTX	ATX
	Neutral position	N range	D range
No load	600-700	650-750	600-700
Electrical loads*2 ON (38-48A)	650-750	650-750	600-700
Electrical loads*2 ON (Above 48A)	700-800	700-800	670-770
A/C ON and refrigerant pressure switch (middle) OFF	700-800	650-750	650-750
A/C ON and refrigerant pressure switch (middle) ON	700-800	750-850	750-850

*1 :

Excludes temporary idle speed drop just after the electrical loads are turned on.

*2 :

Alternator generating current value.

Idle Mixture Inspection

1. Verify that the idle speed and ignition timing are within the specification. (See Idle Speed Inspection.) (See Ignition Timing Inspection.)

2. Insert an exhaust gas analyzer to the tailpipe.

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