Idle Control System — System Troubleshooting Guide
6-59spec tableSystem 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 page 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 LED does not blink CODE 14, go to inspection described on page 6-60.
Engine won't start
Idle Adjusting Screw (page 69)
EACV (page 61)2
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)1
Difficult to start engine when cold
Idle Adjusting Screw (page 69)2
EACV (page 61)1
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)
When cold fast idle out of spec (1,000-2,000 min⁻¹, rpm)
Idle Adjusting Screw (page 69)2
EACV (page 61)1
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)
Rough idle
Idle Adjusting Screw (page 69)
EACV (page 61)2
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)1
When warm engine speed too high
Idle Adjusting Screw (page 69)3
EACV (page 61)2
Air Conditioning Signal (page 64)3
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)1
When warm engine speed too low — Idle speed is below specified (no load)
Idle Adjusting Screw (page 69)2
EACV (page 61)1
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)3
Starter Switch Signal (page 68)
Hoses and Connections (page *)3
When warm engine speed too low — Idle speed does not increase after initial start up.
Idle Adjusting Screw (page 69)
EACV (page 61)1
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)2
Hoses and Connections (page *)
When warm engine speed too low — Idle speed drops when blipping throttle with electrical load
Idle Adjusting Screw (page 69)
EACV (page 61)2
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)1
Starter Switch Signal (page 68)
Hoses and Connections (page *)
When warm engine speed too low — Idle speeds drops when air conditioner in ON
Idle Adjusting Screw (page 69)
EACV (page 61)2
Air Conditioning Signal (page 64)1
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)3
Frequent stalling — While warming up
Idle Adjusting Screw (page 69)
EACV (page 61)1
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)3
Frequent stalling — After warming up
Idle Adjusting Screw (page 69)3
EACV (page 61)2
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)1
Fails emission test
Idle Adjusting Screw (page 69)
EACV (page 61)2
Air Conditioning Signal (page 64)
Alternator FR Signal (page 66)
Starter Switch Signal (page 68)
Hoses and Connections (page *)1