Tune-up and Engine Performance Checks: Testing and Inspection

ENGINE TUNE-UP [L3 WITH TC]

Note: If the accelerator pedal is depressed continuously for a specified time, the engine speed may decrease to the idle speed. This is due to the fuel cut control operation, which prevents overheating, and it does not indicate a malfunction.

Engine Tune-up Preparation
1. Verify that the shift lever is in neutral position





2. Connect the M-MDS to the DLC-2.
3. Verify that no DTCs are available.
4. Warm up the engine (ECT is approx. 80°C (176°F) or more).
5. Turn off the electrical loads,
6. Wait until the cooling fans stop.

Ignition Timing Inspection

Note:
^ The ignition timing cannot be adjusted.
^ The M-MDS is required to verify the ignition timing.

1. Verify the ignition timing (M-MDS: SPARKADV) using the PID/data monitor function of the M-MDS.
Ignition timing Approx. BTDC 10°
2. Verify that ignition timing advances when the engine speed increases gradually.
^ If there is malfunction, refer to "ENGINE SYMPTOM TROUBLESHOOTING". (See SYMPTOM DIAGNOSTIC INDEX [L3 WITH TC] In Engine.)

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.
^ If there is malfunction, refer to "ENGINE SYMPTOM TROUBLESHOOTING" In Engine. (See SYMPTOM DIAGNOSTIC INDEX [L3 WITH TC] In Engine.)
Idle speed
No load: 650-750 rpm
Electrical load on*1: 650-750 rpm
P/S operation: 650-750 rpm
A/C operation: 700-800 rpm

*1 : When the following electrical loads are on: Headlights, rear defroster, cooling fan No.1, cooling fan No.2, and the blower motor (2-step or more.)

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