| Test | TECH 1 | Notes | Nominal Values | Possible |
|---|---|---|---|---|
| Step | Display | Trouble | ||
| No. | Codes | |||
| 07 | DWELL ANGLE | Engine idling (operating temperature) | 15 to 18° / 16 to 20 % | 42 |
Trouble-shooting: Nominal Value: Cause of Trouble:
This Test Step is essentially a checking value to understand the system better but can also be consulted to evaluate ignition problems.
The dwell angle alteration is electronically controlled and can therefore no longer be influenced manually.
Important!
Before trouble-shooting:
· Correct adjustment of idling speed 16 SV MT : 900 to 950 1/min
16 SV AT : 800 to 850 1/min
· Battery voltage must be > 13.5 V with
engine running
With an engine speed < 750 1/min the DWELL ANGLE is not updated.
TECH 1 indicates this with the following display:
| DWELL ANGLE | The ignition voltage is switched on at 65°CA BTDC and switched off at |
|---|---|
| BYPASS MODE | 5°CA BTDC (ignition). |
| SPARK ADVANCE | This means: |
| 5 °CA BTDC | Constant dwell angle at speeds < 750 1/min |
Trouble-shooting: Nominal Value: Cause of Trouble:
· Connection of conventional Checking of:
dwell angle measuring instrument - Primary and secondary side of the
ignition coil
- Ignition leads
- Sparking plugs
· Compare value of dwell angle measuring
instrument with TECH 1 display - Control unit defective
| Opel Tester / TECH 1 | |
|---|---|
| Engine idling | 15 to 18° or 16 to 20 % |
| at 2500 1/min | 30 to 35° or 35 to 39 % |