DTC 36

DTC 36 Low System Voltage:

CIRCUIT DESCRIPTION
This DTC is used to monitor the voltage level available to the ABS EBCM. If the voltage drops below 11 volts, full performance of the ABS system 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 to indicate good charging system condition and also during ABS when voltage may drop significantly.

FAILURE CONDITION
DTC AO36 can only be set if the vehicle's speed is greater than 5 km/h (3 mph). If the switched battery voltage is less than 11.2 volts non-ABS or less than 9.6 volts ABS, a malfunction exists.

ACTION TAKEN
A malfunction DTC is stored, ABS is disabled and the ABS indicator lamp is 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 "A" of the EBCM. 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.

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 as 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 650 should be checked for high resistance or an open condition.