Idle Speed/Ignition Timing/Idle Mixture Ratio Inspection
EF & EC-397flowchartFor models WITHOUT catalyzer (SR20DE only). CONSULT work-support alternative procedure given for ignition timing adjustment.
FOR MODELS WITHOUT CATALYZER (SR20DE only)
Checking and adjusting idle rpm and ignition timing
Checking and adjusting idle rpm and ignition timing (SR20DE without catalyzer)
1
START
2
Visually check the following:
• Air cleaner clogging
• Hoses and ducts for leaks
• Electrical connectors
• Gasket
• Throttle valve and throttle sensor operation
3
Start engine and warm it up until water temperature indicator points to the middle of gauge. Ensure engine stays below 1,000 rpm.
4
Open engine hood and run engine at about 2,000 rpm for about 2 minutes under no-load.
5
Perform E.C.C.S. self-diagnosis (mode II).
O.K.
return to step 7
N.G.
6
Repair or replace components as necessary.
7
Run engine at about 2,000 rpm for about 2 minutes under no-load.
Race engine two or three times under no-load, then run engine for about 1 minute at idle speed.
8
1) Select "IGN TIMING ADJ" in "WORK SUPPORT" mode.
2) Touching "START".
OR
1) Turn off engine and disconnect throttle sensor harness connector.
2) Start engine.
9
Race engine (2,000 - 3,000 rpm) 2 or 3 times under no-load and then run engine at idle speed.
10
Check ignition timing with a timing light.
15°±2° B.T.D.C.
N.G.
I (continues on next page)
O.K.
11
A (continues on next page)