Code 43 - ESC Error (With ESC Module)): Notes
NOTE:
Test numbers refer to numbers on diagnostic chart.
- If conditions for a Code 43 exist, scan tester will indicate knock signal presence. Knock signal should not exist at idle unless an internal or system problem exists.
- Determines if system is currently functioning. Usually, a knock signal can be generated by tapping on exhaust manifold. If knock signal is not generated, try tapping on engine block closer to sensor.
- Because Code 43 sets when signal voltage on spark retard line remains low, this test should cause signal on that line to go high. Control module should see 12-volt signal as a "no knock" signal if control module and wiring are okay.
- This test will determine if knock signal is being detected on sensor-to-controller line or if ESC module is at fault.
- If sensor line is routed too close to secondary ignition wires, ESC module may see induced interference as a knock signal.
- This checks ground circuit to module. An open ground will cause voltage on monitored line to constantly remain about 12 volts. This would cause Code 43 functional test to fail.
- Contacting sensor-to-controller wire using a test light connected to 12 volts will generate a knock signal to controller. This will determine if ESC controller is operating correctly.