| Test | TECH 1 | Notes | Nominal Values | Possible |
|---|---|---|---|---|
| Step | Display | Trouble | ||
| No. | Codes | |||
| 12 | IAC BLOCK LEARN | Engine idling Model Year 89 | 128 STEPS | |
| operating temperature | - | |||
| Model Year 88 | 115 to 141 STEPS |
Model Year 88
Trouble-shooting: Nominal Value: Cause of Trouble:
IAC BLOCK LEARN specifies the nominal air requirement of the engine.
IAC BLOCK LEARN does not become active until a speed signal is received from the pick-up.
On vehicles without odometer frequency sensor the value must be constant at 128.
· IAC BLOCK LEARN < 115 STEPS · See test step 9
section: throttle valve open
· IAC BLOCK LEARN > 141 STEPS · See test step 9
section: insufficient air
Note:
This test step is not active on Model Year 89 vehicles. With idling problems carry out test steps 09 and 10.