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HOMESERVICE MANUALSCHEVROLET2003TRAILBLAZER 4.2 S, 4WDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 989 (POWER STEERING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA LISTCYCLE OUTPUTS
2003 Chevrolet TrailBlazer 4.2 S, 4WD

Cycle Outputs

2003 Chevrolet TrailBlazer 4.2 S, 4WDSECTION Cycle Outputs
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.

A scan tool may be used in order to command the EHPS pump speed enable message ON or OFF. This can be very helpful in determining if a certain portion of a circuit or a component is in working order. The following tests are available under the Special Functions selection. The following can be commanded ON or OFF:

  • EHPS pump speed
  • BPP sensor minimum position learn
Electro-Hydraulic Power Steering (EHPS) Scan Tool Data List

Scan Tool Parameter Data List Units Displayed Typical Data Value
Park brake set with the ignition switch ON/Ignition Switch in RUN/Automatic Transmission in PARK/Air Conditioning is OFF
Brake Pedal Travel Data mm -50 to 200 mm
BPP Sensor Rate Data ms 0 to +10%/25 ms
BPP Sensor Input Volts Data Volts 0 to 5 Volts
BPP Sensor Output Volts Data Volts 0 to 5 Volts
EHPS 42 V Bus Voltage Data Volts 0 to 76 Volts
EHPS Ignition 0 Data OFF/ON ON
EHPS Ignition 1 Data OFF/ON ON
EHPS Demand Data % -100 to +100%
EHPS Demand Speed Data RPM 0 to +7500 RPM
EHPS ECU Temperature Data °C -180 to +180°C (-238 to +302°F)
EHPS Manifold Temperature Data °C -180 to +180°C (-238 to +302°F)
EHPS Motor Current Data A 0 to +200 A
EHPS Motor RPM Data RPM 0 to +7500 RPM
Steering Wheel Rate Data °/s 0 to 2048°/s
Steering Wheel Sensor Phase A Volts Data Low/High Low
Steering Wheel Sensor Phase B Volts Data Low/High High
Vehicle Speed Data km/h 0
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.