Idle Control System

Idle Control System Troubleshooting Guide

NOTE:
- Across each row in the chart, the sub-systems that could be sources of a symptom are ranked in the order they should be inspected, starting with (1). Find the symptom in the left column, read across to the most likely source, then refer to the system or component listed at the top of that column. If inspection shows the system is OK, try the next system (2), etc.

- If the idle speed is out of specification and the Check Engine light does not blink CODE 14, inspect as follows:

- Adjust the idle speed
- Air conditioning signal
- Alternator FR signal
- A/T shift position signal
- Starter switch signal
- Brake switch signal
- P/S oil pressure switch signal
- Fast idle valve
- Air boost valve [B18B1 engine (A/T)]
- Hoses and connections
- EACV and its mounting 0-rings

If the above items are normal, substitute a known-good EACV and readjust the idle speed.
- If the idle speed still cannot be adjusted to specification (and the Check Engine light does not blink CODE 14) after EACV replacement, substitute a known-good ECU and recheck. If symptom goes away, replace the original ECU.