Idle Speed/Ignition Timing/Idle Mixture Ratio Inspection
EF & EC-389flowchartNotes A/T checks in 'N', A/C off conditions. Page is in the SR (SR20DE/SR20DET) tab of the EF & EC section.
Preparation
- 1Make sure that the following parts are in good order. • Battery • Ignition system • Engine oil and coolant levels • Fuses • E.C.U. harness connector • Vacuum hoses • Air intake system (Oil filler cap, oil level gauge, etc.) • Fuel pressure • Engine compression • Throttle valve
- 2On air conditioner equipped models, checks should be carried out while the air conditioner is "OFF".
- 3On automatic transaxle equipped models, when checking idle rpm, ignition timing and mixture ratio, checks should be carried out while shift lever is in "N" position.
- 4When measuring "CO" percentage, insert probe more than 40 cm (15.7 in) into tail pipe.
- 5Turn off headlamps, heater blower, rear defogger.
- 6Keep front wheels pointed straight ahead.
- 7Make the check after the radiator fan has stopped.
FOR MODELS WITH CATALYZER
Overall inspection sequence
Overall inspection sequence (for models with catalyzer)
1
INSPECTION START
2
Perform self-diagnosis.
N.G.
Repair or replace.
O.K.
3
Check & adjust ignition timing.
4
Check & adjust idle speed.
5
Check exhaust gas sensor function.
O.K.
return to step 7
N.G.
6
Check exhaust gas sensor harness.
N.G.
Repair or replace harness.
Repair or replace harness.
INSPECTION END
O.K.
7
Check CO%.
O.K.
Replace exhaust gas sensor.
Replace exhaust gas sensor.
INSPECTION END
N.G.
8
Check emission control parts and repair or replace if necessary.
INSPECTION END
N.G.
9
Check exhaust gas sensor function.
O.K.
INSPECTION END