Diagnostic Test

WARNING: This page is about a different variant/trim than selected.

CHECK FOR AN ACTIVE DTC
1. Turn the ignition on.
2. With the scan tool, read DTCs and record on the repair order.
  Is the DTC active or pending?
  
  Yes
  - Go To 2
  No
  - Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to INTERMITTENT CONDITION .
CHECK FOR OTHER DTCS
1. Refer to the recorded DTCs.
  Are there any 5-Volt Reference DTCs present?
  
  Yes
  - Perform the applicable diagnostic procedure(s). Refer to 3.6L - DIAGNOSTIC CODE INDEX .
  No
  - Go To 3
CHECK THE (B237) 5-VOLT SUPPLY CIRCUIT FOR PROPER VOLTAGE AT THE BPP SENSOR HARNESS CONNECTOR
1. Turn the ignition on.
2. Disconnect the BPP Sensor harness connector.
3. Measure the voltage on the (B237) 5-Volt Supply circuit at the BPP Sensor harness connector.
  NOTE:
  Normal operating voltage should be between 4.8 and 5.2 volts.
  
  Is the voltage between 4.8 and 5.2 volts?
  
  Yes
  - Go To 4
  No
  - Repair the (B237) 5-Volt Supply circuit for an open or short to ground.
  - Perform the ABS VERIFICATION TEST. Refer to ABS VERIFICATION TEST
CHECK THE BPP SENSOR (B138) POSITION SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage on the BPP Sensor (B138) Position Signal circuit at the BPP Sensor harness connector.
  Is the voltage reading above 5.2 volts?
  
  Yes
  - Repair the BPP Sensor (B138) Position Signal circuit for a short to voltage.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 5
CHECK FOR THE BPP SENSOR (B138) POSITION SIGNAL CIRCUIT SHORTED TO THE (B237) BPP SENSOR 5-VOLT SUPPLY CIRCUIT
1. Turn the ignition off.
2. Disconnect the ABS harness connector.
3. Check for continuity between the BPP Sensor (B138) Position Signal circuit and the (B237) 5-Volt Supply circuit at the BPP Sensor harness connector.
  Is there continuity between the BPP Sensor (B138) Position Signal circuit and the (B237) 5-Volt Supply circuit?
  
  Yes
  - Repair the short between the BPP Sensor (B138) Position Signal circuit and the (B237) 5-Volt Supply circuit.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Go To 6
CHECK THE (B937) SENSOR GROUND CIRCUIT FOR AN OPEN/HIGH RESISTANCE
1. Measure the resistance of the (B937) Sensor Ground circuit between the Brake Pedal Sensor harness connector and the ABS harness connector.
  Is the resistance below 3.0 Ohms?
  
  Yes
  - Go To 7
  No
  - Repair the (B937) BPP Ground circuit for an open or high resistance.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
VERIFY THE ABILITY OF THE ABS MODULE TO READ THE BPP SENSOR SIGNAL
1. Turn the ignition off.
2. Reconnect the ABS harness connector.
3. Connect a jumper between the BPP Sensor (B138) Position Signal circuit and the (B937) Sensor Ground circuit at the Brake Pedal Sensor harness connector.
4. Turn the ignition on.
5. With the scan tool, read DTCs.
  NOTE:
  The scan tool should display the P057C-BRAKE PEDAL SENSOR SIGNAL CIRCUIT LOW DTC as active or pending with the jumper in place.
  
  Does the scan tool display the voltage as described above?
  
  Yes
  - Verify that there is good pin to terminal contact in the BPP Sensor and ABS Control Module connectors. Replace the BPP Sensor if no problems were found with the connectors.
  - Perform the POWERTRAIN VERIFICATION TEST. Refer to POWERTRAIN VERIFICATION TEST .
  No
  - Remove the jumper.
  - Go To 8
CHECK THE ANTI-LOCK BRAKE MODULE FOR BRAKE PEDAL SENSOR FAULTS
1. With the scan tool, read DTCs in the ABS Module.
  Is the ABS Module setting any DTCs against a Brake Pedal Sensor?
  
  Yes
  - Perform the diagnostic procedure in the ABS Module. Refer to DIAGNOSIS AND TESTING .
  No
  - Replace the ABS Module in accordance with the Service Information. Refer to DIAGNOSTIC CODE INDEX