| Test | TECH 1 | Notes | Nominal Values | Possible |
|---|---|---|---|---|
| Step | Display | Trouble | ||
| No. | Codes | |||
| 09 | IAC INTEGRATOR | Engine idling, | - | |
| operating temperature | 120 to 142 STEPS | |||
| AT vehicles in P-N | 120 to 142 STEPS | |||
| Ascona-C Cavalier Model Year '88 | 122 to 141 STEPS |
Note:
The IAC INTEGRATOR gives breaking tendency (maintenance of necessary pulse ratios for nominal speed)
of idle speed adjuster.
This means:
128 STEPS is the centre of the control range,
Values > 128 STEPS mean larger,
Values < 128 STEPS mean smaller breaking cross sections of idle speed adjuster
The IAC INTEGRATOR requires following information for control:
- ENGINE SPEED (inductive pulse pick-up)
- Throttle valve closed (via IDLE POSITION SW)
- COOLANT TEMP.
Trouble-shooting: Nominal Value: Cause of Trouble:
· Initially check IDLE POSITION
SW and ENGINE SPEED. If OK carry
out trouble-shooting.
· With IAC PULSE RATIO constant IAC PULSE RATIO 35 to 50 % · Insufficient air
between 80 and 100 % IAC INTEGRATOR 120 - Idle speed adjuster jams, does
and to 142 STEPS not open F5:ACTUATOR TEST,
IAC INTEGRATOR constant carry out test step 01
with a value of > 128 STEPS
- Bypass air hose blocked
or kinked
· With IAC PULSE RATIO constant IAC PULSE RATIO 35 to 50 % · Throttle valve open,
between 0 and 32 % IAC INTEGRATOR 120 Accelerator or throttle valve jams
and to 142 STEPS
IAC INTEGRATOR constant · Idle speed adjuster jams, does not close
with a value of < 128 STEPS F5:ACTUATOR TEST,
carry out test step 01
Other causes of trouble: · Control unit defective
(for checking see table 5
F5:ACTUATOR TEST test step 01)
· AFS defective
(for checking see test step 03)
· IDLE POSITION SW incorrect
(see test step 07)
· Mixture too rich
(see test step 17)