DTC C0615, C0620, C0625, or C0630 HSV

Diagnostic Instructions

DTC Descriptor

DTC C0615 08: Left Front Position Sensor Circuit Signal Invalid

DTC C0615 55: Left Front Position Sensor Circuit Signal Expected Number of Transitions Not Reached

DTC C0620 08: Right Front Position Sensor Circuit Signal Invalid

DTC C0620 55: Right Front Position Sensor Circuit Signal Expected Number of Transitions Not Reached

DTC C0625 08: Left Rear Position Sensor Circuit Signal Invalid

DTC C0625 55: Left Rear Position Sensor Circuit Signal Expected Number of Transitions Not Reached

DTC C0630 08: Right Rear Position Sensor Circuit Signal Invalid

DTC C0630 55: Right Rear Position Sensor Circuit Signal Expected Number of Transitions Not Reached

Typical Scan Tool Data

TP Sensor

Circuit	Short to Ground	Open	Short to Voltage
5-Volt Reference	5 Volts	0 Volts	14 Volts
ESC Sensor Signal	0 Volts	0 Volts	0-14 Volts
Return Circuit	--		0-14 Volts

Circuit/System Description

The electronic suspension control (ESC) module supplies a 5-volt reference signal to the suspension position sensor. The suspension position sensor supplies an analog voltage (0.25-4.75 volts) back to the ESC module which represents the position between the body and the wheel. The sensor is also grounded through the ESC module.

Conditions for Running the DTC

Ignition ON.

Conditions for Setting the DTC

Action Taken When the DTC Sets

Conditions for Clearing the DTC

Reference Information

Schematic Reference

Electronic Suspension Control Schematics .

ESC Malfunction Indicator Lamp

When all DTC's are cleared, and the Diagnostic System Check - Vehicle has been performed the ESC malfunction indicator lamp may stay illuminated for a period of up to 5 seconds when the ignition switch is moved to the "off" position. The ESC malfunction indicator lamp should switch off when the ignition is switched to the "on" position.

Connector End View Reference

Component Connector End Views .

Electrical Information Reference

Scan Tool Reference

Control Module References

Circuit/System Verification

1. Verify that no other DTCs are present, if any other DTCs are present diagnose those DTCs prior to any circuit or component testing.
2. Ignition ON, observe the scan tool Position Sensor Data parameter. The reading should be between 0.25-4.75 volts.

Circuit/System Testing

1. Ignition OFF, disconnect the harness connector at the appropriate position sensor.
2. Ignition OFF, test for less than 1 ohm of resistance between the low reference circuit terminal and a known ground.

⇒	If greater than the specified range, test the low reference circuit for an open/high resistance. If circuit tests normal, replace the ESC module.

3. Ignition ON, test for 4.8-5.2 volts between the 5-volt reference circuit terminal a known ground.

⇒	If less than the specified range, test the 5-volt reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the ESC module.

⇒	If greater than the specified range, test the 5-volt reference circuit for a short to voltage. If the circuit tests normal, replace the ESC module.

4. Verify the scan tool position sensor parameter is less than 0.25 volts.

⇒	If greater than the specified range, test the signal circuit terminal for a short to voltage. If all circuits test normal, replace the ESC module.

5. Connect a 3-A fusible link wire between the signal circuit terminal and the 5-volt reference circuit terminal. Verify the scan tool position sensor parameter is greater than 4.75 volts.

⇒	If less than the specified range, test the signal circuit for a short to ground or an open/high resistance. If all circuits test normal replace the ESC module.

6. If all circuits test normal, replace the applicable suspension position sensor.

Component Testing

1. Disconnect the appropriate sensor.
2. Install a 3-A fusible link wire between the 5-volt reference terminal on the wiring harness and the 5-volt reference terminal on the sensor. Install a jumper wire between the low reference terminal on the sensor and a known ground.
3. Connect a DMM between the signal circuit of the sensor and a known ground.
4. Sweep the suspension position sensor through the entire range while monitoring the voltage on the DMM . The range should vary between 0.25-4.75 volts without any spikes or dropouts.

⇒	If not within the specified range or is erratic, replace the appropriate suspension position sensor.

Repair Instructions

Perform the Diagnostic Repair Verification after completing the diagnostic procedure.