A036

DTC A036 Low System Voltage:

DTC A036 & DTC A037 System Voltage:

Circuit Description:
This DTC is used to monitor the voltage level available to the EBCM. If the voltage drops below 11 volts, full performance of the ABS cannot be guaranteed. During ABS operation, there are several current requirements that will cause battery voltage to drop. Because of this, voltage is monitored prior to ABS operation to indicate good charging system condition and also during ABS operation when voltage may drop significantly.

Failure Condition:
DTC AO36 can only be set if the vehicle's speed is greater than 8 km/h (5 mph). If the switched battery voltage is less than 11.8 volts before ABS operation or 9.3 volts during ABS operation, a malfunction exists.

Action Taken:
A DTC AO36 is stored, ABS is disabled and the "ABS" indicator is turned on or will flash. If the rear motor is not in the home position, the "BRAKE" indicator is also turned on.

Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. This test checks to see what voltage is readily available at terminal "1" of the EBCM connector C2. If voltage is representative of good charging system condition, a malfunction is not present.
2. This step isolates the EBCM to check the condition of the circuitry and charging system.
3. This step isolates the low voltage condition to high circuit resistance or improper charging system operation.
4. This step checks for a possible intermittent malfunction.
5. This step checks for adequate voltage at the EBCM when a load is applied to the system.
6. This step isolates which circuit is the source of the low voltage condition.

Diagnostic Aids:
An "intermittent" malfunction may be caused by a poor connection, rubbed through wire insulation or a wire that is broken inside the insulation.

The frequency of the malfunction can be checked by using the enhanced diagnostic function of the TECH 1.

Any circuitry that is suspected of causing the intermittent complaint should be thoroughly checked for backed out terminals, improper mating, broken locks, improperly formed or damaged terminals, poor terminal to wiring connections or physical damage to the wiring harness.

While performing a voltage load test, if it is noted that only ignition voltage drops below acceptable voltage levels, CKT 35OD should be checked for high resistance or an open condition.