|
No.
|
TECH 1 Display
|
Conditions for
Checking
|
Nominal Value
|
Trouble Codes
|
Terminal
|
|
04
|
SIM. FULL POS. SW
|
Engine running at idle speed
Throttle valve CLOSED
(accelerator pedal in idle position)
Actuate accelerator pedal slightly
Depress accelerator pedal briefly to full load stop (full
throttle)
|
INACTIVE
INACTIVE
ACTIVE
|
21, 22
|
-
|
|
Note:
|
|
In test steps 03 (SIM. IDLE POS. SW) and
04 (SIM. FULL POS. SW), the Motronic control unit uses the
throttle valve potentiometer signal to calculate a simulation for the
throttle valve switch idle and full load contacts.
|
|
The Motronic control unit needs this information for the
idle air control (SIM. IDLE POS. SW) and for the full load
enrichment and oxygen sensor control Cutoff (SIM. FULL POS. SW).
|
|
Notes on Trouble-shooting:
|
Nominal Value:
|
Cause of Fault:
|
|
· Ignition ON
· Disconnect plug
from throttle valve potentiometer P 34 (C 25 XE: removal of
P 34 required).
|
|
|
|
|
greater than 4.9 V
|
· Short circuit
between Ter. 3 (signal lead)
and Ter. 2 (ground)
· Short circuit to
ground in lead from control unit K 61 / Ter. 53 to throttle valve
potentiometer P 34 / Ter. 3
· Control unit
K 61 defective
|
|
· Bridge Ter. 2 with
Ter. 3 in throttle valve potentiometer plug
|
less than 0,1 V
|
· Lead interruption
from
- control
unit K 61 / Ter. 30 to throttle
valve
potentiometer Ter. 1
- control
unit K 61 / Ter. 53 to throttle valve potentiometer Ter. 3
· Control unit
K 61 defective
|
|
|
|
|
|
|
greater than 4.9 V
|
· Lead interruption
or short circuit to ground from control unit K 61 / Ter. 12 to
throttle valve potentiometer plug P 34 / Ter. 2
· Throttle valve
potentiometer P 34 defective
|
|
|
|
|
|
|
|
