Ignition Timing: Adjustments

Idle Mixture Ratio Adjustment (A/T Models ULEV and M/T Models)

PREPARATION
1. Make sure that the following parts are in good order.
- Battery
- Ignition system
- Engine oil and coolant levels
- Fuses
- ECM harness connector
- Vacuum hoses
- Air intake system
(Oil filler cap, oil level gauge, etc.)
- Fuel pressure
- Engine compression
- Throttle valve
- Evaporative emission system

2. On air conditioner equipped models, checks should be carried out while the air conditioner is OFF.
3. On automatic transmission equipped models, when checking idle rpm, ignition timing and mixture ratio, checks should be carried out while shift lever is in P or N (A/T), Neutral (M/T) position.
4. When measuring CO percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5. Turn OFF headlamps, heater blower, rear window defogger.
6. Keep front wheels pointed straight ahead.

OVERALL SEQUENCE

Detailed Procedure (Steps 1 - 2):

Detailed Procedure (Steps 3 - 5):

Detailed Procedure (Steps 6 - 9):

Detailed Procedure (Steps 10 - 14):

Detailed Procedure (Steps 15 - 18):

Detailed Procedure (Steps 19 - 22):

Detailed Procedure (Steps 23 - 26):

Detailed Procedure (Steps 27 - 30):

Detailed Procedure (Steps 31 - 33):

DETAILED PROCEDURE

Idle Mixture Ratio Adjustment (A/T Models except ULEV)

PREPARATION
1. Make sure that the following parts are in good order.
- Battery
- Ignition system
- Engine oil and coolant levels
- Fuses
- ECM harness connector
- Vacuum hoses
- Air intake system
(Oil filler cap, oil level gauge, etc.)
- Fuel pressure
- Engine compression
- Throttle valve
- Evaporative emission system

2. On air conditioner equipped models, checks should be carried out while the air conditioner is OFF.
3. On automatic transmission equipped models, when checking idle rpm, ignition timing and mixture ratio, checks should be carried out while selector lever is in P or N position.
4. When measuring CO percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
5. Turn OFF headlamps, heater blower, rear window defogger.
6. Keep front wheels pointed straight ahead.