DTC 43

Fig. 034 - WIRING DIAGRAM for Code 43 Electronic Spark Control. VIN J:

CODE 43

ELECTRONIC SPARK CONTROL (ESC)

1.8L TURBO "J" SERIES

FUEL INJECTION (PORT)

Code 43 means the ECM has seen low voltage at CKT 457, terminal B7 in the ECM A-B connector, for longer than 4 seconds with the engine running.
This voltage drops when the ESC module shuts off because it receives a knock signal.

Fig. 033 - Chart - Code 43 Electronic Spark Control:

1. Checks to see if ECM recognizes a problem.
2. This will determine if the system is functioning at this time. The knock sensor should respond if exhaust manifold is tapped above sensor.
3. The ESC module supplies voltage to the ECM. It should always be over 6 volts unless the system is sensing engine detonation.
4. Checks for intermittent ESC operation. If the voltage is now over 6 volts, it is a faulty ESC terminal "C" connection or ESC module.
5. Checks for grounded ECM.
6. Checks for open ignition circuit.