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If the Green LED on the side of the unit is on, all is okay.
If the Green LED on the side of the unit is flashing continuously, the unit is warming up.
The sensor requires 30 seconds of warm-up time after the unit is turned on.
If the Red LED is flashing 1, 2, 4, 5, or 6 times per second, the UEGO sensor is broken. Of
course, this will also occur if the sensor is not connected.
Sometimes one or more of these codes will occur within 1 minute of power-up. This is okay
as long as they do not remain active.
If the Red LED is flashing 3 times per second, the battery voltage is either too low (less than
11 V) or too high (greater than 28 V). If this occurs, immediately stop the engine and supply
the correct battery voltage to the control module.
If the CAL POT cannot be turned to where the CAL LED is off then the sensor is bad.
If the AFM1000 outputs erroneous values, one of two conditions exists:
1. The unit is being confused by noisy power or operating in an electrically noisy
environment. In some situations, a timing light might create a noise problem.
Keeping the control module and its wiring harness away from the engine's
ignition wires will help avoid this source of electrical noise.
2. The ground wire on the wiring harness is not attached directly to the ground at the
vehicle's battery. If you connect a single wire from the wiring harness ground to
the vehicle's battery, a large voltage drop will occur across that wire and cause
the analog output ground at the BNC connector to be elevated above battery
ground. And since battery ground is often the engine's data acquisition ground, if
you hook the analog output ground at the BNC connector to the ground at the data
acquisition system then you will cause a current loop through the ground of the
data acquisition system to the vehicle battery.
3. The AFM1000 must be returned to the factory for repair. There are no user-
repairable components inside the control module. The warranty is void if the
control module is opened or wiring harness is modified. Contact ECM before
returning the AFM1000 to the factory.
8
Troubleshooting
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