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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 1528 (Suspension Control System - Suspension Damping) >> Diagnostic Information and Procedures >> DTC C0615, C0620, C0625 or C0630 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

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

  1. 2:  This step tests the position sensor signal voltage range using a scan tool. Normal signal voltage is between 0.35-4.75 volts.
  2. 3:  This step tests the position sensor signal voltage range using a scan tool with the sensor disconnected. Normal signal voltage range with the sensor disconnected is approximately 0 volts.
  3. 4:  This step 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.
  4. 5:  This step tests for a short to voltage in the 8-volt reference circuit.
  5. 6:  This step tests for high resistance or an open in the ground circuit.
  6. 11:  This step tests for an open or high resistance in the position sensor ground circuit.
DTC C0615, C0620, C0625 or C0630

Step Action Value(s) Yes No
Schematic Reference: Suspension Controls Schematics 
Connector End View Reference: Suspension Controls Connector End Views 
1 Did you perform the Electronic Suspension Control Diagnostic System Check? - Go to Step 2  Go to Diagnostic System Check - Electronic Suspension Control 
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 ESC 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 8-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 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 8-volt reference circuit of the position sensor and the ground circuit of the position sensor.
Does the voltage measure less than the specified value?		 8 V Go to Step 6  Go to Step 7 
6 
  1. Turn OFF the ignition.
  2. Measure the resistance from the ground circuit of the position sensor to a good ground.
Does the resistance measure less than the specified value?		 5 Ω Go to Step 12  Go to Step 11 
7 Test the 8-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 8-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 ground 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 applicable position sensor. Refer to Front Position Sensor Replacement - Electronic Suspension  or Rear Position Sensor Replacement - Electronic Suspension .
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the ESC module. Refer to Electronic Suspension Control Module Replacement .
Did you complete the replacement?		 - Go to Step 16  -
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
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