During calibration of the offset of the pressure sensor signal, the pressure sensor signal offset value must be in the range of +/- 217.5 psi (15 Bar).
The pressure sensor is also monitored for sensitivity via a correlation between estimated vehicle deceleration and the pressure sensor signal. This is monitored over the course of numerous straight line non ABS braking stops.
• | The ignition is ON. |
• | The vehicle speed is greater than 40 km/h (25 mph). |
• | The sensor signal offset value is out of range for more than 1 second. |
• | The brake pedal is applied. |
• | The ABS pump is not on. |
• | The pressure sensor sensitivity is outside a predetermined range. |
• | A malfunction DTC is set |
• | ABS, TCS and PCS are disabled |
• | ABS, TCS, SERVICE ENGINE SOON and PCS lamp indicators turn on |
• | ABS braking distance increases |
• | The condition for the DTC is no longer present. |
• | A history DTC will clear after 124 consecutive ignition cycles if the condition for the malfunction is no longer present. |
• | Using a scan tool. |
• | A malfunctioning pressure sensor. |
• | A malfunctioning EBCM. |
The number(s) below refer to the step number(s) on the diagnostic table.
Tests for specified voltage on the brake pressure signal circuit.
Checks to see if voltage was below specified voltage.
Checks to see if voltage was above specified voltage.
Checks to see if voltage was above specified voltage of 5 volt reference.
Checks to see if 5 volt reference from EBCM is 5 volts.
Checks to see if resistance of ground circuit is less than 5 ohms.
Tests for short to voltage in the 5 volt reference circuit.
Tests for a short to ground, a high resistance or an open in the 5 volt reference circuit.
Tests for a short to voltage in the brake pressure sensor signal circuit.
Tests for a high resistance or an open in the ground circuit.
Checks to brake pressure sensor connector for poor connections.
Checks to EBCM connector for poor connections.
Step | Action | Value(s) | Yes | No |
---|---|---|---|---|
1 | Did you perform the ABS Diagnostic System Check? | -- | Go to Step 2 | |
Is the voltage within the specified value? | 0.25 V - 4.75 V | Go to Diagnostic Aids | Go to Step 3 | |
Is the voltage less than the specified value? | 4.75 V | Go to Step 4 | Go to Step 10 | |
Is the voltage greater than the specified value? | 0.25 V | Go to Step 5 | Go to Step 8 | |
Does the voltage measure less than the specified value? | 5 V | Go to Step 6 | Go to Step 7 | |
Does the resistance measure less than the specified value? | 5 ohms | Go to Step 12 | Go to Step 11 | |
Test the 5 volt reference circuit of the brake 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 | |
Test the 5 volt reference circuit of the brake pressure sensor for a short to ground, 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 9 | |
Test the signal circuit of the brake pressure sensor for a short to ground, 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 | |
Test the signal circuit of the brake 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 | |
Did you find and correct the condition? | -- | Go to Step 16 | Go to Step 13 | |
Inspect for poor connections at the harness connector of the brake 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 | |
Inspect for poor connections at the harness connector of the 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 pressure sensor. Refer to Brake Pressure Sensor Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
15 | Replace the EBCM. Refer to Electronic Brake and Traction Control Module Replacement . Did you complete the replacement? | -- | Go to Step 16 | -- |
16 |
Does the DTC reset? | -- | Go to Step 2 | System OK |