DTC 74

74 ELECTRONIC VARIABLE ORIFICE (EVO) ACTUATOR CIRCUIT SHORTED TO BATTERY/SOLENOID SHORTED

DTC 74 EVO Actuator Shorted To Battery Or Solenoid Shorted (For ABS With VES Only):

DTC 73 EVO Actuator Circuit Open Or Shorted To Ground (For ABS With VES Only):

Circuit Description:
Battery voltage is supplied to EVO actuator terminal "A" when the EBCM commands the ABS relay "ON." Ground for the EVO actuator is provided through EBCM terminal "D9" to EVO actuator terminal "B". The EBCM controls the amount of current supplied to the EVO actuator based on input from the wheel speed sensors and the steering wheel speed sensor.

DTC Will Set When:
DTC 74 can be set anytime after ABS initialization. A malfunction exists if an excessive voltage drop is across the EVO actuator driver.

Action Taken:
A malfunction DTC is stored, ABS/VES is disabled, the amber ABS warning lamp is turned "ON" and power steering returns to full assist.

DTC Will Clear When:
DTC 74 setting conditions no longer exist and the ignition key is turned "OFF."

DTC Chart Test Description:
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Checks for a short to voltage in the EVO actuator control circuit.
2. Checks for a shorted actuator solenoid or shorted actuator circuits.
3. Ensures malfunction was not due to physical damage of the EVO actuator circuitry.
4. Isolates the malfunction to either the actuator solenoid or its circuitry.

Diagnostic Aids:
An "Intermittent" malfunction is most likely 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.