LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 992 (Power Steering System) >> Diagnostic Information and Procedures >> DTC C0284 >> Test Description

Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. 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:  Checks the Input Voltage data parameter.
  2. 3:  Checks the Output Voltage data parameter.
  3. 4:  Tests for an open or short to voltage in the BPP sensor 5 volt supply circuit.
  4. 5:  Tests for an open or short to voltage in the BPP sensor 5 volt return circuit.
  5. 6:  Tests for a short to voltage in the BPP sensor signal circuit.
DTC C0284

Step Action Yes No
Schematic Reference: Power Steering System Schematics 
Connector End Views Reference: Power Steering System Connector End Views 
1 Did you perform the electro-hydraulic power steering (EHPS) Diagnostic System Check? Go to Step 2  Go to Diagnostic System Check - Power Steering System 
2 
IMPORTANT: Ensure that the fork of the brake pedal position (BPP) sensor is properly aligned on the pin attached to the brake pedal.
  1. Install a scan tool.
  2. Turn ON the ignition, with the engine ON.
  3. With a scan tool, observe the BPP sensor Input Volts parameter, while pressing down on the brake pedal.
Does the input voltage reading increase as the brake pedal is depressed?		 Go to Step 3  Go to Step 4 
3  With a scan tool, observe the BPP sensor Output Volts parameter, while pressing down on the brake pedal.
Does the output voltage reading decrease as the brake pedal is depressed?		 Go to Step 6  Go to Step 5 
4  Test the BPP sensor 5 volt supply circuit for an open or short to voltage. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 7 
5  Test the BPP sensor 5 volt return circuit 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 11  Go to Step 8 
6  Test the BPP sensor signal circuit 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 11  Go to Step 9 
7 Inspect for poor connections at the harness connector of the BPP sensor. Refer toTesting for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 9 
8 Inspect for poor connections at the harness connector of the EHPS module. Refer to Testing for Intermittent Conditions and Poor Connections andConnector Repairs in Wiring Systems.
Did you find and correct the condition?		 Go to Step 11  Go to Step 10 
9
IMPORTANT: Always perform the calibration procedure for the BPP sensor. Refer to Brake Pedal Position Sensor Calibration Description and Operation .
Replace the BPP sensor. Refer to Brake Pedal Position Sensor Replacement .Did you complete the replacement?		 Go to Step 11  -
10
IMPORTANT: Always perform the calibration procedure for the BPP sensor. Refer to Brake Pedal Position Sensor Calibration Description and Operation .
Replace the EHPS powerpack. Refer to Power Steering Pump Replacement (4.3L) Power Steering Pump Replacement (4.8L, 5.3L and 6.0L) Power Steering Pump Replacement (8.1L) Power Steering Pump Replacement (6.6L Diesel) Power Steering Pump Replacement (Parallel Hybrid Truck) .Did you complete the replacement?		 Go to Step 11  -
11
  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
scientia non olet · About LEMON Manuals