Relay Interface Board (Rib); Co Sensor Module; K5 Main Power Relay - Kohler 5ECD Service Manual

4.6 Relay Interface Board (RIB)

The relay interface board (RIB) contains the K2 crank,
K3 flash, and K5 run relays. Three LEDs indicate relay
operation. See Figure 4-9.
Refer to the schematic diagram in Section 7 for the relay
board connections.
The RIB is protected by a 10 amp fuse (F2). If the fuse
blows repeatedly, disconnect the board leads one at a
time to identify the cause of the blown fuse:
D
Lead 70A
D
Leads FP and FN at the rotor
If the fuse continues to blow and disconnecting
components did not identify the cause, remove the
leads from the P14 connector using a pin pusher, part
#241918 (large) or 241919 (small). If replacing the
leads does not solve the problem, replace the RIB.
The individual relays are not replaceable. If one or more
relays are faulty, replace the entire RIB.
To replace the RIB:
1. Disconnect P14 and the brush leads FP and FN.
2. Pull the board straight off the mounting stand-offs.
3. Snap the new board onto the stand-offs and
reconnect P14 and the brush leads.
1
COMMON
K1
FAULT
2
K2
CRANK
3
3
9
VBAT
K3
FLASH
1. K1 common fault relay (optional)
2. K2 crank relay (standard)
3. K3 flash relay (standard)
4. K4 auxiliary run relay (optional)
5. K5 run relay (standard)
6. P14, engine harness connection (standard)
7. P13, connection to optional relay harness (optional)
Figure 4-9 Relay Board
TP-6391 9/08
7
3
1
AUX
K4
RUN
6 4
P13
P14
K5
RUN
1
7
T1
FN
LED1
RUN
LED2
R
FLASH
R
LED3
FP
CRANK
T2 R
GM29671-A
6

4.7 CO Sensor Module

The CO sensor module is located behind the ADC 2100.
Replace the CO sensor module every two years. See
Figure 4-10.
Note: The CO sensor module is equipped on generator
sets with serial number 2085259 and later.
Figure 4-10 CO Sensor Module

4.8 K5 Main Power Relay

The K5 relay powers the ECM, injector, coils, governor
assembly/throttle body, TMAP sensor, and O2 sensor.
See Figure 4-11.
4
5
Rated Voltage
Operating Current
Coil Resistance
Pull-In Voltage
Release Voltage
Max. Operating Voltage
Figure 4-11 K5 Relay Specs
GM463262-
SCHEMATIC
(sINGLE POLE DOUBLE THROW)
GM28787-K
12 VDC
133 mA
90 ± 10 ohms
< 8 V
1.2 V
15.6 V
Section 4 Controller 35