| Test | TECH 1 | Notes | Nominal Values | |
|---|---|---|---|---|
| Step | Display | |||
| No. | ||||
| 10 | ENGINE SPEED | Engine idling | ||
| Kadett-E/Astra/Belmont (MT), Asc-C/Cavalier | ||||
| Omega/Carlton (AT) C 20 NE, C 20 NEF: | ||||
| Kadett-E/Astra/Belmont (MT), Asc-C/Cavalier | 720 to 880 RPM | |||
| 20 NE, 20 SER, 20 SEH : | MY 88 | |||
| Omega/Carlton (AT) 20 SE | ||||
| Omega/Carlton (MT) | ||||
| 20 SE, C 20 NE, C 20 NEF : | ||||
| Omega/Carlton C 30 LE | 570 to 670 RPM | |||
| Om 3000/Carlton GSi 3000, Sen-BC 30 NE | 670 to 830 RPM MY 88/89 | |||
| Kadett-E/Astra/Belmont, Vectra/Cavalier AT | 720 to 880 RPM | |||
| Vectra/Cavalier 4WD | 920 to 980 RPM | MY 89 * | ||
| Omega/Carlton, Vectra/Cavalier MT ** | 720 to 880 RPM |
* Coolant temperature < 107° C/225° F ** with octane number plug:
| 20 SEH | White = 98/95 RON |
|---|---|
| 20 NE, C 20 NE | Yellow = 95/91 RON |
Trouble-shooting: Nominal Value: Cause of Trouble:
(if nominal value not attained)
· Check idle speed adjuster via actuator diagnosis
· Check octane number plug
coding table page 73
· Check throttle valve switch
· Remove plug from idle speed 11.5 to 13.5 V · Lead interruption from control unit Ter. 35
adjuster and connect to to idle speed adjuster (+, red/blue)
KM-609 adapter lead or from control unit Ter. 33 to
Connect multimeter to idle speed adjuster (-, brown/blue)
both terminals
Ignition ON
Ignition OFF
Measure internal resistance 7.5 to 8.9 W · Idle speed adjuster defective
of idle speed adjuster
· Engine operating Nominal speed according · Pin 11 of control unit on ground
to table carry out test step 24
· If engine speed deviates
carry out test steps 9, 11, 12
· Engine off
· Clearance pulse pick-up/segment disc · Out-of-round of segment disc changes
Check clearance (air gap) air gap to inductive pulse pick-up
between pulse (misfiring at certain speeds)
pick-up and segment disc note correct installation of pulse
with depth gauge pick-up.
Nominal measurement: 0.2 to 1.3 mm/0.08 to 0.52 ins. · Metal shavings or fragments on
pulse pick-up (permanent magnet)
· Check that pulse pick-up
is installed correctly
· Check internal resistance · Control unit defective
of inductive pulse pick-up Lead interruptions from control unit Ter. 25
with multimeter 0.5 to 0.8 W to inductive pulse pick-up Ter. 1
or from control unit Ter. 23
to inductive pulse pick-up Ter. 2
IMPORTANT! Only C 30 LE
If engine speed drops below 600 min¯¹ with simultaneous drop in voltage supply < 11.8 V, idle speed is automatically increased.