ENGINE TUNE-UP[L3]

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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 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 M-MDS to the DLC‐2.

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Ignition Timing Inspection

Note

• Ignition timing is not adjustable.

• Ignition timing verification requires M-MDS.

1. Verify that the ignition timing (M-MDS: SPARKADV PID) is within the specification using M-MDS.

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 M-MDS.

1. Verify that the idle speed (M-MDS: RPM PID) is within the specification using M-MDS.

Idle speed (N position)

No load: 650—750 rpm

Electrical loads on^*1: 650—750 rpm

P/S operation: 650—750 rpm

A/C operation: 650—750 rpm

*1 :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. (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.

Idle mixture

HC concentration: Within the regulation

CO concentration: Within the regulation