Kohler 5ECD Service Manual page 54

Seawater Pressure Switch
See Figure 5-12. Remove the seawater pressure
switch and install a pressure gauge to verify that the
seawater pressure is within the range specified before
testing or replacing the seawater pressure switch. To
test the seawater pressure switch, reinstall the switch
and start the generator set. If the unit shuts down,
disconnect lead 87 from the seawater pressure switch
and reset the controller. Restart the generator set and
verify that it does not shut down. A successful restart
indicates a bad seawater pressure switch. Replace the
switch.
The calibration pressure of the seawater pressure
switch is 0.5 psi ¦ 0.3.
1. Seawater pressure switch
Figure 5-12 Seawater Pressure Switch Location
TMAP Sensor
The TMAP sensor
temperature and pressure. This allows the ECM full
control to monitor actual airflow compared to desired
airflow. The TMAP sensor incorporates both intake
manifold temperature and pressure measurements in
one, single unit. See Figure 5-13 for the TMAP sensor
location.
To test the TMAP sensor, set the generator set master
switch to the OFF position and allow the generator set to
cool. Disconnect the TMAP sensor and use an
ohmmeter to measure the resistance across the sensor.
The sensor resistance varies with temperature and
should be within the values shown in Figure 5-15. If the
resistance is very low (indicating a short circuit) or very
high (indicating an open circuit) replace the TMAP
sensor.
54 Section 5 Component Testing and Adjustment
1
GM39685C-J
monitors intake manifold
2
3
1. TMAP Sensor
2. Manifold elbow
3. Intake manifold assembly
Figure 5-13 TMAP Sensor Location
Thermal Characteristics
Nominal
Sensor
Temperature, Resistance,
_C (_F)
Ohms
130 (266) ¦ 1
85.45
125 (257) ¦ 1
96.68
120 (248) ¦ 1
109.65
115 (239) ¦ 1
124.66
110 (230) ¦ 1
142.08
105 (221) ¦ 1
162.35
100 (212) ¦ 1
186.00
95 (203) ¦ 1
213.68
90 (194) ¦ 1
246.15
85 (185) ¦ 1
284.06
80 (176) ¦ 1
329.48
75 (167) ¦ 1
382.89
70 (158) ¦ 1
466.33
65 (149) ¦ 1
521.91
60 (140) ¦ 1
612.27
55 (131) ¦ 1
720.65
50 (122) ¦ 1
851.10
Figure 5-14 TMAP Sensor Resistance Readings
TMAP Sensor Pin Resistance Check
TMAP Pin 1 (GND) to Pin 4
(PRESSURE SIGNAL KPA)
TMAP Pin 3 (PWR) to Pin 4
(PRESSURE SIGNAL KPA)
TMAP Pin 1 (GND) to Pin 2
(TEMPERATURE SIGNAL)
Figure 5-15 TMAP Sensor Resistance
Max. Ratings of TMAP Sensor
Supply voltage
Pressure
1
GM39685D-J
Sensor
Temperature, Resistance,
_C (_F)
Ohms
45 (113) ¦ 1
1008.6
40 (104) ¦ 1
1199.6
35 (95) ¦ 1
1431.8
30 (86) ¦ 1
1715.4
25 (77) ¦ 1
2062.9
20 (68) ¦ 1
2510.6
15 (59) ¦ 1
3074.9
10 (50) ¦ 1
3791.1
5 (41) ¦ 1
4706.9
0 (32) ¦ 1
5886.7
--5 (23) ¦ 1
7419.0
--10 (14) ¦ 1
9426.0
--15 (5) ¦ 1
12078
--20 (--4) ¦ 1
15614
--25 (--13) ¦ 1
20376
--30 (--22) ¦ 1
26855
--35 (--31) ¦ 1
35763
2.4 -- 8.2 kOhms
3.4 -- 8.2 kOhms
See Figure 5-14
16 volts
500 kPa
TP-6391 9/08