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Home >> Isuzu >> 2007 >> Ascender RWD >> Repair and Diagnosis >> Brakes >> Antilock Brake System, Traction Control System & Stability Control System >> Diagnostic Information and Procedures >> DTC C0455 >> Test Description

Test Description

The number below refers to the step number on the diagnostic table.

  1. 2:  If the DTC sets without turning the steering wheel or driving the vehicle, a malfunction exists in the analog steering wheel position signal to the EBCM.
DTC C0455

Step Action Values 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 
IMPORTANT: Center the steering wheel before proceeding with this step. Do not rotate the steering wheel while performing this step.
  1. Use the scan tool to clear the DTCs.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. Wait approximately 5 seconds to verify whether or not the DTC sets.
Does the DTC set?		 - Go to Step 3  Go to Step 10 
3
  1. Turn OFF the ignition.
  2. Disconnect the steering wheel position sensor harness connector.
  3. Turn ON the ignition.
  4. Select the chassis/ABS/vehicle stability enhancement system (VSES) and Data Display on the scan tool.
  5. Observe the Analog SWPS Signal parameter on the scan tool.
Does the scan tool indicate that the steering wheel position sensor data parameter is less than specified value?		 0.15 V Go to Step 4  Go to Step 9 
4
  1. Connect a 3-amp fused jumper wire between the steering wheel position 5-volt reference circuit and the analog steering signal circuit.
  2. Observe the Analog SWPS Signal parameter on the scan tool.
Does the scan tool indicate that the steering wheel position sensor data parameter is greater than specified value?		 4.75 V Go to Step 5  Go to Step 6 
5 Use a DMM to measure the voltage between the steering wheel position 5-volt reference circuit and the steering wheel position low reference circuit.
Does the voltage measure greater than the specified value?		 4.75 V Go to Step 17  Go to Step 8 
6 Test the 5-volt reference circuit of the steering wheel position sensor for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 7 
7 Test the signal circuit of the steering wheel position sensor for an open or a short to ground. Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 17 
8 Test the low reference circuit of the steering wheel position sensor for an open. Refer to Circuit Testing and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 17 
9 Test the signal circuit of the steering wheel position sensor for a short to voltage. Refer to Testing for Short to Ground and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 17 
10 Operate the vehicle within the Conditions for Running the DTC as specified in the supporting text.
Does the DTC set?		 - Go to Step 11  Go to Diagnostic Aids 
11
  1. Select the VSES Data Display on the scan tool.
  2. Center the steering wheel and verify that the front wheels are straight ahead.
  3. Observe the Analog SWPS Signal parameter.
Does the scan tool display an Analog SWPS Signal within the specified range?		 2.3-2.7 V Go to Step 12  Go to Step 17 
12
  1. Select the VSES Data Display on the scan tool.
  2. Observe digital A and B signals as the steering wheel is rotated from side to side.
  3. The signals will toggle high and low out of phase of each other by 90 degrees when the steering wheel is rotated.
Does only one signal toggle?		 - Go to Step 13  Go to Step 14 
13
  1. Turn OFF the ignition.
  2. Disconnect the steering wheel position sensor harness connector.
  3. Disconnect the electronic brake control module (EBCM) harness connector. Refer to Control Module References .
  4. Turn ON the ignition.
  5. Test the steering wheel position circuits, signal A and signal B for the following conditions:
Did you find and correct the condition?		 - Go to Step 20  Go to Step 14 
14 Test the battery positive voltage circuit to the steering wheel position sensor for an intermittent open. Refer to Testing for Electrical Intermittents and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 15 
15 Test both of the steering wheel position sensor ground circuits for an intermittent open. Refer to Testing for Electrical Intermittents and Wiring Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 16 
16 Inspect for poor connections at the harness connector of the steering wheel position sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs .
Did you find and correct the condition?		 - Go to Step 20  Go to Step 18 
17 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 20  Go to Step 19 
18 Replace the steering wheel position sensor. Refer to Steering Wheel Position Sensor or Steering Shaft Lower Bearing Replacement .
Did you complete the replacement?		 - Go to Step 20  -
19
IMPORTANT: Following EBCM replacement, perform the setup procedure for the EBCM. Use the scan tool to perform the Tire Size Calibration procedure.
Replace the EBCM. Refer to Control Module References .Did you complete the replacement?		 - Go to Step 20  -
20
  1. Use the scan tool Clear All serial data DTCs function to clear all of the DTCs from all modules.
  2. Turn OFF the ignition for 5 seconds.
  3. Turn ON the ignition.
  4. 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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