300E (124.030) L6-3.0L (103.983) (1986)
is defective. Wire to diagnostic socket,
and wires to diagnostic socket. Check
terminal 3 interrupted or on-off ratio
on-off ratio tester. Check fuel/air mix-
tester defective. Air/fuel mixture too
ture. Check O2-sensor signal.
rich. O2-sensor signal voltage is + 12 V.
10%
Air flow sensor position indicator defec-
Check air flow sensor position indicator
tive or polarity reversed. Idle speed
signal and routing of wires. Check
contact on throtte valve switch defec-
throttle valve switch.
tive.
20%
Wires in plug of throttle valve switch
Check throttle valve switch and wire
incorrectly connected or short circuit
connections according to wiring diagram.
(full load contact closed before engine
reaches full load).
30%
Short circuit or wire interruption be-
Check coolant temperature sensor.
tween CIS-E control unit and coolant
temperature sensor or coolant temperature
sensor defective (idle speed too
high).
40%
Short circuit or wire interruption to air
Check air flow sensor position indicator.
flow sensor position indicator or air flow
sensor position indicator defective.
50%
O2-sensor not at operating temperature,
Check O2-sensor.
wire interruption or defective.
60%
Not used.
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70%
No TD signal (wire interruption).
(Check TD signal
80%
Short circuit or wire interruption to alti-
Check altitude correction capsule.
tude correction capsule or capsule defective.
90%
Not used.
---
100%
Air/fuel mixture too lean, O2-sensor de-
Check on-off ratio and O2 sensor signal.
fective (short circuit to ground). CIS-E
control unit or on-off ratio tester defective.
No power to EHA.
Check wiring between CIS-E control unit and EHA for continuity.
Reading
No malfunction within the circuit of the
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oscillates
monitored signals. On-off ratio
indicated.