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Home >> Hummer >> 2008 >> H2 4D Utility Wagon >> Repair and Diagnosis >> External Pages >> Different car >> Section 40 (Antilock Brake System With TCS) >> Diagnostic Information and Procedures >> DTC C0191 >> Test Description

Test Description

WARNING: This page is about a different car, the 2007 Hummer H2. 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:  Tests for specified voltage on the LNG accelerometer signal circuit.
  2. 3:  Checks to see if voltage was below or above specified voltage.
  3. 4:  Checks to see if voltage was above specified voltage.
  4. 5:  Checks to see if voltage was below specified voltage.
  5. 6:  Checks to see if voltage was above specified voltage.
  6. 7:  Checks to see if resistance of ground circuit is less than 5 ohms.
  7. 8:  Tests for a short to voltage on the 5-volt reference circuit.
  8. 9:  Tests for a short to ground, a high resistance, or an open in the 5-volt reference circuit.
  9. 10:  Tests for a short to ground, a high resistance, or an open in the lateral accelerometer signal circuit.
  10. 11:  Tests for a short to voltage in the lateral accelerometer signal circuit.
  11. 12:  Tests for a high resistance or an open in the ground circuit.
  12. 13:  Checks the LNG accelerometer sensor connector for poor connections.
DTC C0191

Step Action Value(s) Yes No
Schematic Reference: Antilock Brake System Schematics 
Connector End View Reference: Antilock Brake System Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - Go to Step 2  Go to Diagnostic System Check - Vehicle
2 
  1. Turn OFF the ignition.
  2. Disconnect the electronic brake control module (EBCM).
  3. Install the J 39700  Universal Pinout Box with the J 39700-530  Cable Adapter between the EBCM and the EBCM harness connector. See Special Tools .
  4. Turn ON the ignition, with the engine OFF.
  5. Using the J 39200  , measure the voltage between pin 10 and pin 15 of the J 39700  . See Special Tools .
Is the voltage within the specified value?		 0.48 V-4.82 V Go to Diagnostic Aids Go to Step 3 
3 
  1. Reconnect the LNG accelerometer sensor.
  2. Using a J 39200  , measure the voltage between pin 10 and pin 15 of the J 39700  . See Special Tools .
Is the voltage less than the specified value?		 4.82 V Go to Step 4  Go to Step 11 
4  Using a DMM, measure the voltage between pin 10 and pin 15 of the J 39700  . See Special Tools .
Is the voltage greater than the specified value?		 0.48 V Go to Step 5  Go to Step 10 
5  Using a DMM, measure the voltage between the 5-volt reference circuit pin 28 and the ground circuit pin 15 on the J 39700  . See Special Tools .
Does the voltage measure less than the specified value?		 2 V Go to Step 9  Go to Step 6 
6  Using a DMM, measure the voltage between the 5-volt reference circuit pin 28 and ground circuit pin 15 on the J 39700  . See Special Tools .
Does the voltage measure greater than the specified voltage?		 3 V Go to Step 8  Go to Step 7 
7 
  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable.
  3. Measure the resistance from the ground circuit of the LNG accelerometer to a good ground.
Does the resistance measure less than the specified value?		 5 Ω Go to Step 14  Go to Step 12 
8  Test the 5-volt reference circuit of the LNG accelerometer sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 13 
9  Test the 5-volt reference circuit of the LNG accelerometer sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 10 
10  Test the LNG accelerometer signal circuit of the LNG accelerometer sensor for a short to ground, a high resistance, or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 13 
11  Test the LNG accelerometer signal circuit of the yaw/lateral accelerometer sensor for a short to voltage. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 13 
12 
  1. Disconnect the EBCM.
  2. Test the ground circuit of the LNG accelerometer sensor for a high resistance or an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 13 
13  Inspect for poor connections at the harness connector of the LNG accelerometer sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 15 
14 Inspect for poor connections at the harness connector of the EBCM. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 17  Go to Step 16 
15 Replace the vehicle LNG accelerometer sensor. Refer to Longitudinal Accelerometer Replacement .
Did you complete the replacement?		 - Go to Step 17  -
16 Replace the EBCM. Refer to Control Module References for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 17  -
17
  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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