GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 2006 🢒 SRX 🢒 Accessories 🢒 Navigation Systems 🢒 DTC C0615, C0620, C0625, or C0630

Circuit 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 (0.35-4.75 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.

DTC Descriptors

This diagnostic procedure supports the following DTCs:

    • DTC C0615 Left Front Position Sensor Circuit
    • DTC C0620 Right Front Position Sensor Circuit
    • DTC C0625 Left Rear Position Sensor Circuit
    • DTC C0630 Right Rear Position Sensor Circuit

Conditions for Running the DTC

The ignition is ON.

Conditions for Setting the DTC
    • The DTC is set when the ESC module measures the position sensor signal voltage below 0.35 volts or above 4.75 volts for more than 1 second.
    • The fault is detected during 3 consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with a scan tool.

Action Taken When the DTC Sets
    • The ESC module will enter the Speed Dependent damping mode.
    • Both Left and Right Normal Force outputs will be set to the default output states.
    • The SERVICE SUSPENSION SYS message will be displayed.

Conditions for Clearing the MIL/DTC
    • The scan tool can be used to clear the DTC.
    • The DTC is saved as history when the ESC module no longer sees voltage outside the normal range. The DTC will clear if the fault does not return during 50 consecutive ignition cycles.

Diagnostic Aids
    • If this fault condition is set along with DTC C0696, diagnose DTC C0696 first.
    • If the DTC is a history DTC, the fault may be intermittent. Refer to Testing for Intermittent Conditions and Poor Connections in Wiring Systems.

Test Description

The numbers below refer to the step numbers on the diagnostic table.

  1. Tests for the proper operation of the circuit in the low voltage range.

  2. Tests for the proper operation of the circuit in the high voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to ground.

  3. Tests for a short to voltage in the 5-volt reference circuit.

    4.

  4. Tests for a high resistance or an open in the ground circuit.

Step

Action

Value(s)

Yes

No

Schematic Reference: Suspension Controls Schematics

1

Did you perform the Diagnostic System Check - Vehicle?

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Go to Step 2

Go to Diagnostic System Check - Vehicle in Vehicle DTC Information

2
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With the scan tool, observe the position sensor data parameter in the electronic suspension control (ESC) module data list.

Does the scan tool indicate that the position sensor data parameter is within the specified range?

0.35-4.75 V

Go to Diagnostic Aids

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the position sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the position sensor data parameter.

Does the scan tool indicate that the position sensor data parameter is less than the specified value?

0.35 V

Go to Step 4

Go to Step 10

4

  1. Turn OFF the ignition.
  2. Connect a 3-amp fused jumper wire between the 5-volt reference circuit of the position sensor and the signal circuit of the position sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the position sensor data parameter.

Does the scan tool indicate that the position sensor data parameter is greater than the specified value?

4.75 V

Go to Step 5

Go to Step 8

5

  1. Disconnect the fused jumper wire.
  2. Measure the voltage between the 5-volt reference circuit of the position sensor and the low reference circuit of the position sensor.

Does the voltage measure less than the specified value?

5 V

Go to Step 6

Go to Step 7

6

  1. Turn OFF the ignition.
  2. Measure the resistance from the low reference circuit of the position sensor to a good ground.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 12

Go to Step 11

7

Test the 5-volt reference circuit of the position sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

8

Test the 5-volt reference circuit of the position sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 9

9

Test the signal circuit of the position sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

10

Test the signal circuit of the position sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

11
  1. Disconnect the ESC module.
  2. Test the low reference circuit of the position sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 13

12

Inspect for poor connections at the harness connector of the position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 14

13

Inspect for poor connections at the harness connector of the ESC module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 16

Go to Step 15

14

Replace the position sensor. Refer to Electronic Suspension Front Position Sensor Replacement or Electronic Suspension Rear Position Sensor Replacement .

Did you complete the replacement?

--

Go to Step 16

--

15

Replace the ESC module. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.

Did you complete the replacement?

--

Go to Step 16

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16
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.

Does the DTC reset?

--

Go to Step 2

System OK