Antilock Braking System (ABS)

DTC 36 Low System Voltage:

CIRCUIT DESCRIPTION
This DTC is used to monitor the voltage level available to the EBCM/EBTCM. If the voltage drops below 10.5 volts, full performance of the ABS/TCS cannot be guaranteed. During ABS/TCS operation, there are several current requirements that will cause battery voltage to drop. Because of this, voltage is monitored prior to ABS/TCS operation to indicate good charging system condition and also during ABS/TCS operation when voltage may drop significantly.

DTC WILL SET WHEN
DTC 36 can only be set if the vehicle's speed is greater than 8 km/h (4 mph). If both the solenoid power input and ignition power voltages are less than 10.5 volts, a malfunction exists.

ACTION TAKEN
A malfunction DTC is stored, ABS/TCS is disabled and the "ANTILOCK" and "TRACTION OFF" Indicator lamps are turned "ON."

DTC CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks for proper connections at EBCM/EBTCM.
2. Checks for excessive resistance in the ground circuit.
3. Checks voltage input to the EBCM/EBTCM.

DIAGNOSTIC AIDS
Possible causes:
- Charging system malfunction.
- Battery malfunction
- Loss of ground.

An "intermittent" malfunction is most likely caused by a poor connection, rubbed through wire insulation, or a wire that is broken inside the insulation.

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 641 should be checked for high resistance or an open condition.