AEM Water Methanol Failsafe Device 303020 User Manual

Page 11 
DATA LOGGER 
 
The Water/Methanol Failsafe has an internal logger that can store approximately 2.5 minutes of injection data.  The logger 
maintains two levels of data logs.  First, all flow data points are stored and downloadable for viewing on the Flow vs. 
Injection Graph in the Water/Methanol Failsafe Configuration tab.  Second, all injection events, inputs, outputs, and alarm 
triggers are logged in special log file format for viewing with the AEMdata software that comes as part of the...

Page 12 
 
Plot One 
Parameter Description 
Flow Measured flow rate in cc/min 
Lower Flow Limit Lower flow limit value as related to Injection Percentage 
Upper Flow Limit Upper flow limit value as related to Injection Percentage 
 
Plot Two 
Parameter Description 
Alarm Source Indicates what triggered the alarm condition; 1-low flow condition, 2-high flow condition, 3-auxiliary 
input, 4-alarm test 
Alarm Status Indicates state of alarm; 1-alarm triggered, 0-alarm not triggered 
Alarm Reset Counter...

Page 13 
 
OUTPUT CONFIGURATION 
 
The Water/Methanol Failsafe has two outputs that are triggered when an alarm condition exists; one +12 volt (high side) 
output and one ground (low side) output.  These outputs can be used in a multitude of ways to reduce boost, pull timing, 
or otherwise protect an engine in the event there is a problem with the water/methanol injection system.  The following is 
an index of possible auxiliary devices that can be triggered by the alarm outputs: 
 
AEM EMS 
Function...

Page 14 
NC/NO Relay  
 
The following are examples of how a NC/NO relay (Bosch PN 0-332-019-203 or similar) can be configured for use with 
the Water/Methanol Failsafe. 
 
Signal Interrupt − The high side (12 volt) output from the W ater/Methanol Failsafe can be used to turn on a NC (normally 
closed) relay and interrupt the output signal from a boost controller to its boost control solenoid – see Figure 1.  
Conversely, the low side (ground) output can also be used to trigger the relay − see Figure 2....

Page 15 
Warning Light 
 
The Water/Methanol Failsafe can also be used to directly activate a warning light (Autometer PN 3239 or similar).  
Connect the warning light black wire to ground and power the light with the high side output – see Figure 5.  Alternatively, 
the low side output can also be used to turn the light on if the white wire is connected to +12V – see Figure 6. 
 
 
 
 
 
 
 
 
 
 
 
 
WATER/METHANOL FAILSAFE GAUGE 
 
The Water/Methanol Failsafe gauge comes with the black bezel installed...

Page 16 
Status Lights 
 
The Water/Methanol Failsafe gauge has two status lights (see below) that indicate when an alarm has been triggered.  
The left status light will turn on if there is a low flow alarm.  The right status light will turn on if there is a high flow alarm.  
Both status lights will turn on if the auxiliary input is triggered.   
 
 
 
Analog Output 
 
The analog output from the Water/Methanol Failsafe is a linear dc voltage signal that varies with flow.  The signal is used 
for...

Page 17 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Connector Pinouts 
 
The pinouts for the 3-pin sensor harness, 4 pin I/O harness, 8-pin power harness, and 5 pin USB harness are provided 
below. 
 
 
 
 
 
Voltage cc/min gal/hr 
0.50 0 0.00 
0.75 31 0.50 
1.00 63 0.99 
1.25 94 1.49 
1.50 125 1.98 
1.75 156 2.48 
2.00 188 2.97 
2.25 219 3.47 
2.50 250 3.96 
2.75 281 4.46 
3.00 313 4.95 
3.25 344 5.45 
3.50 375 5.94 
3.75 406 6.44 
4.00 438 6.93 
4.25 469 7.43 
4.50 500 7.93 
Voltage cc/min gal/hr...

Page 18 
12 Month Limited Warranty 
  
Advanced  Engine  Management,  Inc.  warrants  to  the  consumer  that  all  AEM  High  Performance  products  will  be  free  from  defects  in 
material and workmanship for a period of twelve (12) months from date of the original purchase. Products that fail within this 12 month 
warranty period will be repaired or replaced at AEM’s option, when determined by AEM that the product failed due to defects in material 
or workmanship. 
  
This warranty is limited to...