CODE 43 FUEL SUPPLY SYSTEM
1. Turn ignition off. Remove BACK UP fuse in the under hood relay box for 10 seconds to reset ECU. Start engine and warm to normal operating temperature (cooling fan comes on). Raise engine speed to 3000
RPM and hold for 2 minutes. Verify if CHECK ENGINE light is on and if LED is flashing Code 43.1f LED is flashing Code 43, go to next step. If LED is not flashing Code 43, problem is intermittent. Check
connections at O2 sensor, related circuits and at ECU.
2. Turn ignition off. Connect ECU Test Harness between ECU and connector. Wait at least 2 minutes with ignition off. Turn ignition on. Measure voltage between terminals D14 (positive) and A26 (negative) as soon
as ignition is turned on. If less than .1 volt is present when ignition is first turned on, got to step 4). If more than .1 volt was present, go to next step.
3. Disconnect 4 wire connector from O2 sensor. Measure voltage at O2 sensor connector between terminal "C" (negative) and "D" (positive). If voltage is more than .1 volt, replace O2 sensor. If voltage was less
than .1 volt, repair open in White wire between ECU terminal D14 and O2 sensor.
4. Disconnect 4 wire connector from O2 sensor. Measure voltage between terminals D14 (positive) and A26 (negative). If voltage is more than .1 volt, replace O2 sensor. If voltage was less than .1 volt, disconnect
test connector "D" from main wire harness.
note this can also set you r code 1
Oct 14, 2011 at 4:42 PM
