C0620

DTC C0620

CIRCUIT DESCRIPTION
The suspension position sensor provides an analog signal voltage between 0.25 and 4.75 volts to the electronic suspension control (ESC) module. This signal voltage represents the wheel's position relative to the body. The ESC module provides a reference and a low reference to the sensor.

CONDITIONS FOR RUNNING THE DTC
Under normal driving conditions.
Vehicle speed greater than 0 km/h (0 mph).

CONDITIONS FOR SETTING THE DTC
The ESC module senses a position signal voltage below 0.25 volts or above 4.75 volts.

ACTION TAKEN WHEN THE DTC SETS
- All 4 suspension damper solenoids will be commanded to their OFF state.
- The SERVICE RIDE CONTROL message will be displayed.
- Stores a DTC C0615, C0620, C0625 or C0630 in the ESC module memory.

CONDITIONS FOR CLEARING THE DTC
- The ESC module no longer senses a position signal voltage out of range with vehicle speed greater than 0 km/h (0 mph).
- Using a scan tool.
- A history DTC will clear after 100 consecutive ignition cycles if the condition for the malfunction is no longer present.

DIAGNOSTIC AIDS

IMPORTANT: Ignition cycle counting is used by the ESC module to detect faults in the system. The objective is to eliminate false/intermittent codes while maintaining an acceptable level of system performance. The operation of the ignition cycle counting requires that a fault condition be present for four consecutive ignition cycles before it will set the fault code and display "SERVICE RIDE CONTROL" message. If a fault code is present (without a fault being current), the system will go into one or more degraded modes without displaying a message. Resetting the ignition cycle counter is done by clearing codes with a scan tool. Clearing codes will override ignition cycle counting for one ignition cycle. Therefore, a fault condition will set the fault code immediately if it occurs on the first ignition cycle after the codes are cleared.

- A faulty suspension position sensor voltage reading may result if the vehicle is or has been on a hoist that allows the suspension to hang free.

IMPORTANT: Before proceeding with the diagnosis, do a visual inspection of the mechanical aspects of the suspension position sensor and its components.
Ensure the suspension position sensor and the suspension position sensor link is not bent, disconnected, or insulation on wires are not rubbed through or damaged in any way.
If DTC C0870 is present, repair the malfunction for this DTC before diagnosing DTC C0615, C0620, C0625 or C0630.

The following conditions may cause the malfunction to occur:
- A short to voltage on the 5 volt reference circuit
- A short to ground on the 5 volt reference circuit
- An open in the 5 volt reference circuit to the suspension position sensor
- A short to voltage on the suspension position sensor signal circuit
- A short to ground on the suspension position sensor signal circuit
- An open in the suspension position sensor signal circuit
- An open in the suspension position sensor low reference circuit
- A malfunctioning suspension position sensor
- A disconnected, bent or damaged suspension position sensor link

TEST DESCRIPTION

Steps 1-2:

Steps 3-6:

Steps 7-12:

Steps 13-17:

The numbers below refer to the step numbers on the diagnostic table.
2. Check the suspension position sensor data parameter.
3. Tests for the proper operation of the circuit in the low voltage range.
4. Tests for a short to voltage in the 5 volt reference circuit.
5. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
7. Tests for a high resistance or an open in the ground circuit.