F0:DATA LIST
No.
| TECH 1 Display |
|---|
| Conditions for Checking |
| Nominal Value |
| Trouble Codes |
| Terminal |
| 23 |
| IAC INTEGRATOR |
Engine running at idle speed, operating temperature
| 121 to 135 steps |
|---|
| 56, 57 |
| INTERN. |
Note:
The IAC INTEGRATOR indicates the opening tendency (oberservance of the pulse duty ratio necessary for nominal engine speed) of the idle speed adjuster.
This means:
Values > 128 steps mean larger,
values < 128 steps mean smaller opening cross-sections of the idle speed adjuster.
The IAC INTEGRATOR requires the following information for regulation:
- ENGINE SPEED (inductive pulse pick-up)
- Throttle valve closed (via TV. POT. SIGNAL)
- COOLANT TEMP.
Notes for Trouble-shooting:
· First check TPS SIGNAL and engine speed.
If OK, start trouble-shooting
Nominal Value:
Cause of Fault:
| · |
Continued
· If IAC ADAPT. SLOPE is constantly between 87 and 107 steps
and
IAC INTEGRATOR constantly at a value >128 steps
· If IAC ADAPT. SLOPE isconstantly between 87 and 107 steps
and
| IAC INTEGRATOR constantly at a value <128 steps |
IAC ADAPT. SLOPE
87 to 107 steps
IAC INTEGRATOR
121 to 135 steps
IAC ADAPT. SLOPE
87 to 107 steps
IAC INTEGRATOR
| 121 to 135 steps |
· Lackof air
- Idle speed adjuster jams, does not open
- Bypass air hose blocked or kinked
· Throttle valve open, accelerator cable or throttle valve jams
· Idle speed adjuster jams, does not close
· Coolant temperature sensor P12 defective
· Throttle valve potentiometer P34 defective
· Mass air flow meter P44 defective
· Mixture too rich (see test step 27)
· Control unit K61 defective