CODE 43, ESC (ALL EXCEPT 4.3L TURBO & MODELS W/4L80-E TRANS)
NOTE:Test numbers refer to test numbers on diagnostic chart.
If conditions for a Code 43 exist, Scan tester will display YES. A knock signal should not exist at idle unless an internal or system problem exists.
Determines if system is functioning. Usually, a knock signal can be made by tapping on the exhaust manifold. If knock signal is not made, try tapping on engine block near sensor. On models with automatic transmission, it may be necessary to place gear selector lever in Drive.
Because Code 43 sets when the signal voltage on the spark retard line remains low, this test should cause the signal on that line to go high. The 12-volt signal should be seen by the ECM as a no knock signal if the ECM and wiring are okay.
This test determines if the knock signal is detected on the sensor-to-controller line or if the ESC module is at fault.
If sensor line is routed too close to secondary ignition wires, the ESC module may see the interference as a knock signal.
This checks ground circuit to module. An open ground will cause the voltage on the monitored line to remain constant at about 12 volts. This would cause the Code 43 functional test to fail.
This should generate a knock signal to the controller. This determines if the ESC controller is operating correctly
Sunday, January 25th, 2009 AT 4:51 PM
