4 minute read
GM 4.3L, G6 Engine ECU Error Code Description
Error Code Condition Cause Effects on Operation
1 Engine Over Speed Engine rpm at 3000 for more than 0.30 Close throttle valve fully back to seconds normal operation after restarting 2 Input signal from Input voltage signal from accelerator sensor Close throttle valve fully, shut power accelerator sensor is exceeded 97% of maximum input signal source of starter, back to normal out of specification 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 Can be operated normally except switch on accelerator sensor stayed at on when input voltage limiting engine speed to 1500 rpm, sensor is not correct signal from accelerator sensor exceeds 50% back to normal operation after of maximum restarting 4 Throttle close positionDuring calibration the ECU did not receive Close throttle valve fully, shut power sensing switch on on-signal from throttle close position sensing source to starter, back to normal carburetor is not switch even if stepping motor was moved operation after restarting correct correctly 5 Throttle open position During calibration the ECU did not receive Can be operated normally except sensing switch on on-signal from throttle open position sensing limiting engine speed to 1500 rpm, carburetor is not switch even if stepping motor was moved back to normal operation after restarting correct correctly (98 degrees) 6 Stepping motor is not ECU received unexpected on-signal from Close throttle valve fully, back to correct throttle open or close position sensing on normal operation after restarting 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 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 Every 30 engine starts To reset error history Turn key switch on with check box switch on
Error Code Condition Cause Effects on Operation
1 Engine Over Speed Engine at 3000 rpm for more than 0.30 Close throttle valve fully, back to seconds normal operation when engine goes down to under 2000 rpms 2 Accelerator sensor is Input voltage signal from accelerator sensor Close throttle valve fully, shut power out of specification exceeded 4.61 volts for more than 1.0 sec., source of starter, back to normal input signal voltage from accelerator sensor operation after restarting did not exceed 10% of maximum for more than 1.0 sec., when the idle position sensing switch is on the accelerator sensor 3 Idle position sensing Idle position sensing switch on accelerator Close throttle valve fully, back to switch on accelerator sensor stayed at on for more than 1.0 sec., normal operation after restarting sensor is not correct while input voltage signal from accelerator sensor exceeded 50% of maximum 4 Throttle close positionDuring calibration the ECU did not receive Close throttle valve by 5% of maximum sensing switch on on-signal from throttle close position sensing stroke and shut power source of carburetor is not switch, even if stepping motor was moved stepping motor, back to normal correct correctly. operation after restarting
5 Throttle open position During calibration the ECU did not receive Operates normally except limiting sensing switch on on-signal from throttle open position sensing engine stepping motor stroke to carburetor is not switch even if stepping motor was moved 90 degrees, back to normal operation correct correctly (98 degrees). after resetting error history
6 Stepping motor is not ECU received unexpected on-signal from Close throttle valve fully, back to correct throttle open or close position sensing normal operation after restarting switches on carburetor for more than 1 sec. 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 0.2 seconds normal operation when ECU receives correct a revolution pulse signal for more than 0.2 sec.
Carburetor Stepping After every 5 engine starts or after the error codes have been cleared from the ECU. motor Initializes (Carburetor will cycle from Full Open to Full Close to set throttle stroke)
To reset error history Install diagnostic tool 91868-02300. Turn the diagnostic tool switch to the ON position. Press throttle pedal down 50% or more and while holding the throttle pedal down turn the ignition switch to the ON position. The fault codes are now cleared.
Removal and Installation
➧ A ➧ A ➧ ➧A➧ ➧A➧ ➧B➧ ➧C➧
➧D➧
Removal steps
1. Spark Plug Wires 2. Ignition Coil Wire 3. Coil 4. Distributor 5. Gasket 6. Spark Plugs
