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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 49 (Suspension Control System - Suspension Leveling (ASCM)) >> Diagnostic Information and Procedures >> DTC C0625 or C0630 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Cadillac DTS. 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 checks the air suspension sensor data parameter.
  2. 3:  This step tests for the proper operation of the circuit in the high voltage range.
  3. 4:  This step tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens upon performing this test, the signal circuit has a short to voltage.
  4. 5:  This step tests for a short to ground in the 5-volt reference circuit.
  5. 7:  This step tests the 5-volt reference circuit for the air suspension sensor.
DTC C0625 or C0630

Step Action Values Yes No
Schematic Reference: 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, observe the suspension position sensor 5 volt reference parameter in the data list for the air suspension control module.
Is the position sensor parameter within the specified range?		 0.5-4.85 V Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the air suspension sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the suspension position sensor 5 volt reference parameter.
Is the position sensor parameter more than the specified value?		 0.5 V Go to Step 4  Go to Step 8 
4 
  1. Turn OFF the ignition
  2. Connect a 3-amp fused jumper wire between the signal circuit of the air suspension sensor and the low reference circuit of the air suspension sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With a scan tool, observe the position sensor parameter.
Is the position sensor parameter less than the specified value?		 0.5 V Go to Step 5  Go to Step 9 
5 
  1. Turn OFF the ignition.
  2. Disconnect the fused jumper wire.
  3. Turn ON the ignition, with the engine OFF.
  4. Test the 5-volt reference circuit voltage of the suspension position sensor.
Is the suspension position sensor 5-volt reference voltage greater than the specified value?		 4.85 V Go to Step 7  Go to Step 6 
6 Test the 5-volt reference circuit of the suspension position sensor for a short to ground. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
7  Test the 5-volt reference circuit of the suspension position sensor for one of the following conditions:
Did you find and correct the condition?		 - Go to Step 15  Go to Step 11 
8 Test the signal circuit of the position sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
9 Test the signal circuit of the position sensor for one of the following conditions:
Did you find and correct the condition?		 - Go to Step 15  Go to Step 10 
10 Test the low reference circuit of the position sensor for one of the following conditions:
Did you find and correct the condition?		 - Go to Step 15  Go to Step 12 
11 Inspect for poor connections at the harness connector of the position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 13 
12 Inspect for poor connections at the harness connector of the air suspension control module. Refer to Testing for Intermittent Conditions and Poor Connections and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 15  Go to Step 14 
13 Replace the air suspension position sensor. Refer to Air Spring Leveling Sensor Replacement .
Did you complete the replacement?		 - Go to Step 15  -
14
  1. Replace the air suspension control module. Refer to Air Suspension Control Module Replacement .
  2. Perform the suspension position calibration procedure for the air suspension module if necessary after checking the trim height procedure. Refer to Suspension Position Calibration .
Did you complete the replacement?		 - Go to Step 15  -
15
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle within the Conditions for Running the DTC.
Does the DTC reset?		 - Go to Step 2  System OK
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