C0495

DTC C0495 - EVO Tracking Error Diagnostic Table - Part 1 Of 2:

DTC C0495 - EVO Tracking Error Diagnostic Table - Part 2 Of 2:

DTC C0495 - EVO Tracking Error:

CIRCUIT DESCRIPTION
The EVO/Passlock Module supplies a 0-850 milliamperes PWM current (percent DUTY CYCLE) to the Steering Assist Control Solenoid. This current is used to extend or retract the actuator valve inside the solenoid. This in turn will regulate an orifice on the power steering pump, causing the fluid flow output to modulate. This results in an increase or decrease in steering wheel effort. With 0 milliampere supplied to the Steering Assist Control Solenoid, the valve will be fully retracted, providing maximum fluid flow and power steering assist. With 850 milliamperes supplied to the Steering Assist Control Solenoid, the valve will extend, decreasing fluid flow and minimizing power steering assist. The EVO/Passlock Module is constantly adjusting current flow to the Steering Assist Control Solenoid based on vehicle speed and steering wheel position rate of change, thus providing vehicle speed related power steering assist.

CONDITIONS FOR SETTING THE DTC
There is a open or short to ground, or short to voltage in WHT (1294) or BRN (1295) wires while the EVO/Passlock Module is pulsing the current to the Steering Assist Control Solenoid.
1. When voltage is below 0 volts.
2. When voltage is at battery voltage.
^ The above conditions must be met for one second or longer.

ACTION TAKEN WHEN THE DTC SETS
The EVO/Passlock Module will not send any current to the Steering Assist Control Solenoid. This will cause the solenoid valve to retract, providing maximum fluid flow and full power steering assist at all times.

CONDITIONS FOR CLEARING THE DTC
1. A history DTC will clear after 100 consecutive ignition cycles have occurred without a fault.
2. History and current DTC(s) can be cleared by using the scan tool.

DIAGNOSTIC AIDS
^ If DTC C0498, C0499, C0502 or DTC C0503 are present, perform these code tests first.
^ An Intermittent problem may be caused by a poor connection, break in the wire insulation exposing the internal wire, or a wire that is broken inside the insulation.
^ The EVO/Passlock Module and the Vehicle Control Module (VCM) should be thoroughly checked for terminals that have backed out, broken locks, improperly formed or damaged terminals, weak terminal retaining tension, or for proper routing.
^ The solenoid valve may be stuck, providing uncalculated power steering assist, refer to mechanical diagnosis in POWER STEERING GEAR AND PUMP.

TEST DESCRIPTION
The Step numbers below refer to the same step numbers in the EVO TRACKING ERRORS DIAGNOSTIC TABLE.
^ Step 1 ensures that the DIAGNOSTIC SYSTEM CHECK is performed.
^ Step 2 checks for a short to voltage in WHT (1294) or BRN (1295) wires with the EVO/Passlock Module disconnected.
^ Step 3 checks for commanded and actual duty cycle.
^ Step 4 checks the Steering Assist Control Solenoid harness for a short to voltage with the solenoid disconnected on WHT (1294) or BRN (1295) wires.
^ Step 6 checks the Steering Assist Control Solenoid harness for a short to ground or open with the solenoid disconnected on WHT (1294) or BRN (1295) wires.
- If voltage is indicated, there is a short to voltage on WHT (1294) or BRN (1295) wires.
- If voltage is 0, there is a short to ground on WHT (1294) or BRN (1295) wires.