Kohler Command PRO EFI ECH749 [43/180] Efi system electronic throttle body etb ech
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Kohler Command PRO EFI ECH749 [43/180] Efi system electronic throttle body etb ech

Kohler Command PRO EFI ECH749 [43/180] Efi system electronic throttle body etb ech
4324 690 01 Rev. O KohlerEngines.com
EFI SYSTEM-ELECTRONIC THROTTLE BODY (ETB) ECH
Style 2 (Larger Sensor)
Pin D
Pin C
Pin B
Pin A
A
B
Pin A Heater + Pin B Heater -
Pin C Sensor Output Pin D Sensor Ground
A
22 mm or 7/8 in.
Wrench Size
B
18 mm x 1.5
Thread Size
Installation Torque 50.1 N·m (37 ft. lb.)
Cutaway Oxygen Sensor Components (O2)
A
B
C
D
E
F
G
A Protection Shield B
Planar Element
and Heater
C Lower Insulator D
Stainless Steel
Housing
E Upper Insulator F
Terminal Connection
to Element
G
High Temp
Water Seal
Temperature must be controlled very accurately and gas
constituents measured to a high degree of accuracy for
absolute sensor measurements. This requires laboratory
equipment to determine a good or bad sensor in fi eld.
Furthermore, as with most devices, intermittent problems
are diffi cult to diagnose. Still, with a good understanding
of system and sensor, it is possible to diagnose many
sensor problems in fi eld.
Using KOHLER
®
Diagnostic System (KDS) Gen 2, see
Tools and Aids, connected to ECU is a useful technique
for observing sensor performance. However, user must
understand that such software reads a signal generated
by ECU. If there is an ECU or wiring problem, readings
could be misinterpreted as a sensor problem. Digital
nature of signal to KDS tool means that it is not reading
continuous output of sensor. A voltmeter can also be
used as an eff ective tool in diagnosing sensors.
Using injector timing test within KDS tool will aid in
testing operation of O2 sensor. See instructions within
help (?) area of injector timing test.
It is advisable to use an electronic meter such as a
digital voltmeter. Simple mechanical meters may place
a heavy electrical load on sensor and cause inaccurate
readings. Since resistance of sensor is highest at
low temperatures, such meters will cause largest
inaccuracies when sensor is in a cool exhaust.
Visual Inspection
Sensor Wire Detail
A
A
Keep a minimum of 25 mm (1.0 in.) radius at
grommet.
NOTE: Always route harness away from hot exhaust
and away from moving parts.
NOTE: Do not attempt to clean sensor. Replace as
needed.
1. Look for a damaged or disconnected sensor-to-
engine harness connection.
2. Look for damage to sensor lead wire or associated
engine wiring due to cutting, chaffi ng or melting on a
hot surface.
3. Disconnect sensor connector and look for corrosion
in connector.
4. Try reconnecting sensor and observe if problem has
cleared.
5. Correct any problems found during visual check.
6. Inspect for any exhaust system leaks upstream or
downstream of oxygen sensor. Confi rm oxygen
sensor is secured to exhaust with appropriate
torque.
Style 1 (Smaller Sensor) 18 N·m (159 in. lb.).
Style 2 (Larger Sensor) 50.1 N·m (37 ft. lb.).
All leaks must be repaired and an ECU reset must
be performed before proceeding with sensor testing.
7. Using KDS tool, document any trouble codes.
Determine if historic trouble codes are logically
related to current fault experienced. If uncertain,
clear codes and retest.

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