A043

Fig. 55 Code A043, System Voltage Is Low. 1990-91 Models. (Part Of 2).:

Code AO43 System Voltage Is Low:

Voltage from fusible Element 1, is applied at all times to the Front Enable Relay terminal 1 and the Antilock Brake Controller Battery Sense Input. Since the Antilock Brake Controller needs greater than 9.7 volts to properly operate, Code A043 is set when the applied voltage is less than 9.7 volts.

CODE: A034 will set when the voltage being supplied to terminal 1 D8 of the Antilock Brake Controller is below 9.7 volts and vehicle speed has exceeded 10 mph.

TEST DESCRIPTION. The following provides an explanation of the procedures being followed in the facing trouble tree

1. Determines if the battery or charging system is faulty, or isolates the problem to the Antilock Brake system.
2. If Code A005 is not set, the problem is in the 990 CKT.
3. Checks for short to ground in 962 CKTS.
4. Checks for short to ground in 962 CKTS.
5. Determines if open is present before or after fusible Element 1.
6. Indicates if open is in 990 CKT or possibly internal to Controller.
7. Determines if fault is a constant failure internal to Controller or an intermittent.