12
Troubleshooting
Trouble codes are output as LED flashes and as signal output pulses. The pulses are active
low, so the signal will be pulled low for each pulse. In voltage output mode, 0V indicates a
low state. In current output mode, 4mA indicates a low state. This allows for both visual
indication as well as indication for the integrated diagnostic system.
Failure Mode
Judgment Condition
Action After Failure Condition
Heater
Stop
Code
Heater Open
-
Off
1
x1
Heater Shorted
-
Off
1
x2
Under or over Vbat
Vbat<11V or Vbat>28V
Off
1
x3
Vs too high
VVS>3.7V(Vs>1.7V)
On
1
x4
Codes: The codes represent the number of times the output is pulled low.
For example:
x1 – One 125ms pulse every 2 seconds
x2 – Two 125ms pulses every 2 seconds
x3 – Three 125ms pulses every 2 seconds
x4 – Four 125ms pulses every 2 seconds
See figure below for the code waveform diagram.