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If the PWR (Green) LED on the side of the unit is on, all is okay.
If the PWR (Green) LED on the side of the unit is flashing continuously, the unit is warming
up. The sensor requires approximately 30 seconds of warm-up time after the unit is turned
on.
If the ERR (Red) LED is flashing (see table on page 7), the UEGO sensor is bad. 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 after 1 minute.
If the ERR (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 counterclockwise to where the CAL (Yellow) LED is off
then the sensor is bad.
If the AFM outputs erroneous values, one of three 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. For the AFM1000 only, 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 AFM 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 AFM to the factory.
Troubleshooting
13
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