GM 4.3L, G6 Gasoline Engine ECU Error Code Description (ECU Part Numbers 16A94-01000, 16A94-11000, 16A94-31000) Error Code
Condition
Cause
Effects on Operation
1
Engine Over Speed
Engine rpm at 3000 for more than 0.30 seconds
2
Input signal from accelerator sensor is out of specification
Input voltage signal from accelerator sensor Close throttle valve fully, shut power exceeded 97% of maximum input signal source of starter, back to normal voltage from accelerator sensor did not operation after restarting exceed 10% of maximum when idle position sensing switch on the accelerator sensor is off
3
Idle position sensing Idle position sensing switch on accelerator switch on accelerator sensor stayed at on when input voltage sensor is not correct signal from accelerator sensor exceeds 50% of maximum
4
Throttle close position sensing switch on carburetor is not correct
During calibration the ECU did not receive Close throttle valve fully, shut power on-signal from throttle close position sensing source to starter, back to normal switch even if stepping motor was moved operation after restarting correctly
5
Throttle open position sensing switch on carburetor is not correct
During calibration the ECU did not receive Can be operated normally except on-signal from throttle open position sensing limiting engine speed to 1500 rpm, back to normal operation after restarting switch even if stepping motor was moved correctly (98 degrees)
6
Stepping motor is not ECU received unexpected on-signal from correct throttle open or close position sensing on carburetor
7
Revolution pulse signal ECU did not receive revolution pulse signal Close throttle valve fully, back to from distributor is not from distributor for more than specified period normal operation after restarting correct while voltage of alternator L terminal was within normal operating range, before engine reaches operating speed: 1 second, after engine reaches operating speed: 0.1 seconds
8
Alternator problem
Can be operated normally except limiting engine speed to 1500 rpm, back to normal operation after restarting
Close throttle valve fully, back to normal operation after restarting
Voltage of alternator L terminal remained Close throttle valve fully, back to lower than normal operating range over 30 normal operation after restarting seconds when ECU receives revolution pulse signal from distributor
Engine Initialize To reset error history
Close throttle valve fully back to normal operation after restarting
Every 30 engine starts Turn key switch on with check box switch on
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