Tune-up and Engine Performance Checks: Service and Repair
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 selector lever is in P, N 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.)
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". (See Symptom Diagnostic Index.)
Idle speed (P, N position)
- No load: 650-750 rpm
- Electrical load on*1: 650-750 rpm
- P/S operation: 650-750 rpm
- A/C on: 650-780 rpm
Idle speed (D position)
- No load: 575-675 rpm
- Electrical load on*1: 600-700 rpm
- P/S operation: 650-750 rpm
- A/C on: 600-780 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.
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