Mike's Workshop Manuals: Service manuals for every vehicle
Home >> Cadillac >> 2006 >> XLR Base >> Repair and Diagnosis >> Brakes >> Antilock Brake System With Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0137 >> Test Description

Test Description

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

  1. 3:  This step tests for the proper operation of the circuit in the low voltage range.
  2. 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.
  3. 5:  This step tests for a short to voltage in the 5-volt reference circuit.
  4. 6:  This step tests for a high resistance or an open in the low reference circuit.
DTC C0137

Step Action Values Yes No
Schematic Reference: Anti-Lock Brake System Schematics 
Connector End View Reference: Anti-Lock Brake System Connector End Views 
1 Did you perform the Diagnostic System Check - Vehicle? - 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 a scan tool, observe the Brake Fluid Pressure Sensor Input parameter in the VSES data list.
Does the scan tool display that the Brake Fluid Pressure Sensor Input parameter is within the specified range?		 0.14-4.9 V Go to Diagnostic Aids Go to Step 3 
3 
  1. Turn OFF the ignition.
  2. Disconnect the brake fluid pressure sensor connector.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, observe the Brake Fluid Pressure Sensor Input parameter.
Does the scan tool indicate that the Brake Fluid Pressure Sensor Input parameter is less than the specified value?		 0.14 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 brake fluid pressure sensor and the signal circuit of the brake fluid pressure sensor.
  3. Turn ON the ignition, with the engine OFF.
  4. With the scan tool, observe the Brake Fluid Pressure Sensor Input parameter.
Does the scan tool indicate that the Brake Fluid Pressure Sensor Input parameter is greater than the specified value?		 4.9 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 brake fluid pressure sensor and the low reference circuit of the brake fluid pressure sensor.
Does the voltage measure less the specified value?		 5 V Go to Step 6  Go to Step 7 
6 
  1. Turn OFF the ignition.
  2. Disconnect the negative battery cable. Refer to Battery Negative Cable Disconnection and Connection in Engine Electrical.
  3. Measure the resistance from the low reference circuit of the brake fluid pressure sensor to a good ground.
Does the resistance measure less than the specified value?		 5 Go to Step 12  Go to Step 11 
7 Test the 5-volt reference circuit of the brake fluid pressure sensor for a short to voltage. Refer to Circuit Testing andWiring 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 brake fluid pressure sensor for the following conditions:
  • An open
  • A short to ground
  • A high resistance

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 brake fluid pressure sensor for the following conditions:
  • An open
  • A short to ground
  • A high resistance

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 brake fluid pressure 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 Test the low reference circuit of the brake fluid pressure 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 brake fluid pressure 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 electronic brake control module (EBCM). 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 brake fluid pressure sensor. Refer to Brake Fluid Pressure Sensor Replacement .
Did you complete the replacement?		 - Go to Step 16  -
15 Replace the EBCM. Refer to Control Module References in Computer/Integrating Systems for replacement, setup, and programming.
Did you complete the replacement?		 - Go to Step 16  -
16
  1. Clear the DTCs using the scan tool.
  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
scientia non olet · About Mike's Workshop Manuals