Multec-M (14 SE / C 14 SE / C 16 SE) F0:DATA LIST
| No. | TECH 1 Display | Conditions for Checking | Nominal Value | Trouble Codes | Terminal |
|---|---|---|---|---|---|
| 15 | IDLE AIR CONTROL | Engine running at idle speed, operating temperature. If the number of steps falls under 8 or exceeds 26 (at idle speed without load) for a period of time longer than 10 s, the control unit resets the stepper motor after ignition OFF. After waiting 5 s, restart engine. If, after this procedure, the number of steps is less than 8 or higher than 26, begin trouble-shooting. |
If the number of steps is always near the 26 threshold (24 to 28), make sure that 26 steps are exceeded for longer than 10 s by switching on a consumer (LAMP, REAR SCREEN HEATING, AUTOMATIC TRANSMISSION in "D"). Then proceed as described above.
A stepper motor test is also carried out if the control unit has been disconnected from the vehicle electrical system.
| 8 to 26 steps | 35 | C 5, C 6, 8, C 9/ D1 | |
|---|---|---|---|
| Trouble-shooting: | Nominal Value: | Cause of Fault: | |
| (If nominal value is not attained) |
· Slowly increase engine speed to 4000 rpm by actuating the accelerator cable, maintain briefly and then allow to sink to idle speed again.
· Wait approx. 5 sec. (Astra-F C 14 SE)
· Ignition OFF, ignition ON
(Corsa-A/Nova, Corsa-B, Astra-F C 16 SE)
· Engine running at idle speed, operating temperature
Astra-F C 16 SE
(Corsa-A/Nova, Corsa-B, Astra-F C 16 SE)
820 to 980 rpm
820 to 980 rpm
850 to 1010 rpm
| · Carry out test step 06 |
· Select TECH 1 mode "F8"
· Using arrow keys, increase idle speed (1500 rpm) and decrease (1000 rpm)
Engine speed increases and decreases.
| · Throttle valve gap too large or too small (basic adjustment may only be changed in emergencies, see next page but one) |
· Engine takes in dead air
· Trouble code 21 and 22 set
· Ignition OFF
· Disconnect plug from idle speed adjuster M 66
· Ignition ON
· TECH 1 in mode "F5" IDLE AIR CONTROL
· Measure voltage: (20V/AC)
from: wiring harness plug Ter. A
to: wiring harness plug Ter. C
and
from: wiring harness plug Ter. B
to: wiring harness plug Ter. D
A/C: 5.6 to 6.9 ~volts
B/D: 5.6 to 6.9 ~volts
| · Lead interruption |
from: stepper motor A, C, B, D
to: control unit Ter. C 9, C 5, C 8, C 6
· Ignition OFF
· Remove motor M 66
· Connect plug to idle speed adjuster M 66
· Ignition ON
TECH 1 in mode "F5" IDLE AIR CONTROL
Compress pintle slightly with thumbs
Pintle moves in and
out noticeably
| · Servo motor defective |
· Ignition OFF
· Measure resistance of coils A-B and C-D
(wiring harness plug is disconnected)
55 W - 65 W (cold)
45 W - 60 W (warm)
| · Servo motor defective |
· Further causes
| · Throttle valve gap too large or too small |
· Engine takes in dead air
· Seat of servo motor dirty
· Spark plugs defective
· Mixture too lean or too rich
· Battery voltage too high/low
· Odometer frequency sensor / instrument defective or circuit interrupted
· Dual-Info-Display defective or short circuit to ground in odometer frequency sensor lead from Dual-Info-Display to control unit K 57/K 91