ISSPRO EV² Series Troubleshooting
All gauges:
1. Check if the gauge pointer homes (moves towards pointer stop) on power-up. You should hear a faint
noise from the gauge motor for a moment, and see the pointer move against the pointer stop, then it
should move away from the pointer stop to the value the sensor currently indicates.
2. If the gauge homing function does not work, check your ignition input voltage at the pins into the gauge.
You should have battery voltage into pin #1, ground at pin #3. Check voltages at the exposed metal
portion of the terminal on the orange connector (accessible from the top of the gauge with the connector
plugged into the gauge). If you do not see the voltage across those terminals; check for voltage between
the actual wires (you can probe the cut ends of the wires). If you do not have voltage across the wires,
check your source (vehicle) connection for the wires. If you find voltage at the wires but not at the
terminals, check that the wires are sufficiently seated into the orange connector to make electrical
contact. If you definitely have power between these two terminals (not just to the wires but to the
terminals within the orange connector) but still no homing, then the gauge should be replaced.
3. If your backlighting is not working but the gauge is otherwise functioning, check voltage between the
gauge pins 2 & 3 (checking at the exposed metal portion of the terminal on the orange connector). With
the dimmer turned up all the way, you should see something close to battery voltage. If you have a 3
rd
generation (2003 or newer) Dodge, and the gauges dim significantly (more so than the factory dash)
when your grid heater cycles, you may have the older software version in your gauges. Check the gauge
label for a version number (letter “A” followed by a 3-digit number). The updated lighting is on versions
A134 & higher. Some older gauges did not have any version number on the label. If you need the
updated lighting software, contact ISSPRO Customer Service to send back for reprogramming.
Standard Pressure Gauges (Boost Pressure, Oil Pressure, Exhaust Backpressure, Trans Pressure,
Drive Oil Pressure):
4. If the gauge performs the homing functions of step #1 but the pointer moves to the straight down (6:00)
position, the sensor reading is out of range. Perform the following checks in order, with the orange
connector plugged in and ignition turned on:
a. Checking at the terminals of the orange connector, check the voltage between pin #4 and pin #6.
It should be between 4.5 and 5.5 volts. If it is outside this range, the gauge is damaged.
b. Check the voltage between the actual wires (rather than the terminals) by probing the ends of the
wires, between pin #4 and pin #6. It should be between 4.5 and 5.5 volts. If the voltage is
present at the terminals but not the wires, check that the wires are sufficiently seated into the
orange connector to make electrical contact.
c. Check the voltage between the actual wires (rather than the terminals) by probing the ends of the
wires, between pin #5 and pin #6. It should be between 0.5 and 4.5 volts. If it is outside this
range, the sensor is damaged.
d. Checking at the terminals of the orange connector, check the voltage between pin #5 and pin #6.
It should be between 0.5 and 4.5 volts. If it is outside this range but within the range when
checking at the wires, check that the wires are sufficiently seated into the orange connector to
make electrical contact.
e. The value measured at step d above should be as follows:
for 100 psi sensor (all gauges up to 100 psi)-
For the 175 psi sensor (gauges from 100 to 180 psi except Trans Pressure) –
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