Inspection and Verification
WARNING: This page is about a different car, the 2007 Mercury Mariner and 2007 Ford Escape. However, it is still accessible from the selected car via links, so may be relevant.
WARNING:
The traction battery and charging system contain high voltage components and wiring. High voltage insulated safety gloves and a face shield must be worn when carrying out any diagnostics on this vehicle. Failure to follow these instructions may result in severe personal injury or death.
NOTE:
If a new hydraulic control unit (HCU) is installed, it must be configured. Follow the scan tool directions.
- Verify the customer concern.
- Verify the stoplamps operate correctly by applying and releasing the brake pedal with the ignition switch in the OFF position. If the stoplamps do not operate correctly, refer to EXTERIOR LIGHTING article. If the stoplamps operate correctly, proceed to the next step.
- Verify the PRNDL operates correctly on the instrument cluster. If the PRNDL does not operate correctly, refer to INSTRUMENT CLUSTER article. If the PRNDL operates correctly, proceed to the next step.
- Visually inspect for obvious signs of mechanical or electrical damage.VISUAL INSPECTION CHART
Mechanical Electrical - Wheel speed sensor ring
- HCU
- Base brake system
- Brake booster vacuum hose
- Steering components and suspension components
- Tire size
- Battery junction box (BJB) fuse(s):
- 1 (5A)
- 10 (30A)
- 15 (20A)
- 24 (50A)
- 31 (50A)
- Smart junction box (SJB) fuse 34 (5A)
- Circuitry
- Anti-lock brake system (ABS) module
- Wheel speed sensor
- Stoplamp switch
- Brake pressure transducer
- Brake fluid level switch
- Accelerometer/sensor cluster
- If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
- If the cause is not visually evident, connect the scan tool to the data link connector (DLC).
- If the scan tool does not communicate with the VCM:
- check the VCM connection to the vehicle.
- check the scan tool connection to the VCM.
- refer to MODULE COMMUNICATIONS NETWORK article, No Power To The Scan Tool, to diagnose no communication with the scan tool.
- If the scan tool does not communicate with the vehicle:
- verify the ignition key is in the ON position.
- verify the scan tool operation with a known good vehicle.
- refer to MODULE COMMUNICATIONS NETWORK article to diagnose no response from the powertrain control module (PCM).
- Carry out the network test.
- If the scan tool responds with no communication for one or more modules, refer to MODULE COMMUNICATIONS NETWORK article.
- If the network test passes, retrieve and record continuous memory diagnostic trouble codes (DTCs).
- Clear the continuous DTCs and carry out the self-test diagnostics for the anti-lock brake system (ABS) module.
- If the DTCs retrieved are related to the concern, go to Anti-Lock Brake System (ABS) Module Diagnostic Trouble Code (DTC) Chart or the Transmission Control Module (TCM) Diagnostic Trouble Code (DTC). For all other DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
- If no DTCs related to the concern are retrieved, go to Symptom Chart .
NOTE:
Make sure to use the latest scan tool software release.
NOTE:
The vehicle communication module (VCM) LED prove out confirms power and ground from the DLC are provided to the VCM.
ANTI-LOCK BRAKE SYSTEM (ABS) MODULE DIAGNOSTIC TROUBLE CODE (DTC) CHART
| DTC | Description | Source | Action |
|---|---|---|---|
| B1317 | Battery Voltage High | Anti-Lock Brake System (ABS) Module | Go to Pinpoint Test F . |
| B1318 | Battery Voltage Low | ABS Module | Go to Pinpoint Test F . |
| B1342 | ECU is Defective | ABS Module |
NOTE:
If other DTCs are present, REPAIR them before installing a new component. DISCONNECT the 12 volt battery negative cable for a minimum of 5 minutes. CONNECT the 12 volt battery negative cable. CLEAR the DTCs. RETRIEVE the DTCs. If DTC B1342 is retrieved again, INSTALL a new ABS module. REFER to Anti-Lock Brake System (ABS) Module in this article. REPEAT the self-test. |
| B2477 | Module Configuration Failure | ABS Module | REFER to MODULE CONFIGURATION article. |
| B2741 | Sensor Cluster Loop End | ABS Module | INSTALL new sensor cluster. REFER to Accelerometer - Hybrid . FOLLOW the scan tool directions for the calibration procedure. |
| B2900 | VIN Mismatched | ABS Module | VERIFY the module has the correct as-built data. REFER to MODULE CONFIGURATION
article. CHECK for correct powertrain control module (PCM) and ABS module configuration using the scan tool. RECONFIGURE the components as necessary. FOLLOW the scan tool directions. CLEAR the DTCs. REPEAT the self-test. |
| C1095 | ABS Hydraulic Pump Motor Circuit Failure | ABS Module | Cycle the ignition switch. CLEAR the DTCs. With the ignition in the RUN position, fully press and release the brake pedal at least 10 times to activate the hydraulic pump motor. CARRY OUT the on-demand self test. Retrieve the DTCs. If DTC C1095 is present, INSTALL a new hydraulic control unit. REFER to Hydraulic Control Unit (HCU) - Hybrid in this article. TEST the system for normal operation. |
| C1141 | Wheel Speed Sensor LF Tone Ring Tooth Missing Fault | ABS Module | Go to Pinpoint Test H . |
| C1142 | Wheel Speed Sensor RF Tone Ring Tooth Missing Fault | ABS Module | Go to Pinpoint Test H . |
| C1143 | Wheel Speed Sensor LR Tone Ring Tooth Missing Fault | ABS Module | Go to Pinpoint Test H . |
| C1144 | Wheel Speed Sensor RR Tone Ring Tooth Missing Fault | ABS Module | Go to Pinpoint Test H . |
| C1145 | Wheel Speed Sensor RF Input Circuit Failure | ABS Module | Go to Pinpoint Test G . |
| C1155 | Wheel Speed Sensor LF Input Circuit Failure | ABS Module | Go to Pinpoint Test G . |
| C1165 | Wheel Speed Sensor RR Input Circuit Failure | ABS Module | Go to Pinpoint Test G . |
| C1175 | Wheel Speed Sensor LR Input Circuit Failure | ABS Module | Go to Pinpoint Test G . |
| C1187 | Brake Fluid Level Sensor Input Open | ABS Module | Go to Pinpoint Test M . |
| C1188 | Brake Fluid Level Sensor Input Short Circuit to Battery | ABS Module | Go to Pinpoint Test M . |
| C1189 | Brake Fluid Level Sensor Input Short Circuit to Ground | ABS Module | Go to Pinpoint Test M . |
| C1233 | Wheel Speed LF Input Signal Missing | ABS Module | Go to Pinpoint Test H . |
| C1234 | Wheel Speed RF Input Signal Missing | ABS Module | Go to Pinpoint Test H . |
| C1235 | Wheel Speed RR Input Signal Missing | ABS Module | Go to Pinpoint Test H . |
| C1236 | Wheel Speed LR Input Signal Missing | ABS Module | Go to Pinpoint Test H . |
| C1288 | Pressure Transducer Main/Primary Input Circuit Failure | ABS Module | CLEAR the DTCs. REPEAT the self-test. If DTC C1288 is present, make sure all HCU and ABS module fasteners are tightened to their correct torque specification. If all fasteners are tightened to their correct torque specification, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1305 | Longitudinal Acceleration Sensor Signal Fault | ABS Module | Go to Pinpoint Test I . |
| C1310 | Brake Hydraulic Pressure Transducer Front Left Wheel Circuit Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1310 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1311 | Brake Hydraulic Pressure Transducer Front Left Wheel Signal Fault | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1311 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1312 | Brake Hydraulic Pressure Transducer Front Right Wheel Circuit Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1312 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1313 | Brake Hydraulic Pressure Transducer Front Right Wheel Signal Fault | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1313 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1314 | Brake Hydraulic Pressure Transducer Rear Left Wheel Circuit Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1314 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1315 | Brake Hydraulic Pressure Transducer Rear Left Wheel Signal Fault | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1315 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1316 | Brake Hydraulic Pressure Transducer Rear Right Wheel Circuit Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1316 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1317 | Brake Hydraulic Pressure Transducer Rear Right Wheel Signal Fault | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1317 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1318 | Brake Hydraulic Pressure Transducer Accumulator Circuit Fault | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1318 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1319 | Brake Hydraulic Pressure Transducer Accumulator Signal Fault | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1319 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1320 | Brake Hydraulic Accumulator Travel Sensor Circuit Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1320 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1321 | Brake Hydraulic Accumulator Travel Sensor Signal Fault | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. CLEAR the DTCs. REPEAT the self-test. If DTC C1321 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1322 | Brake Hydraulic Master Cylinder Piston Travel Sensor 1 Circuit Failure | ABS Module | Go to Pinpoint Test N . |
| C1323 | Brake Hydraulic Master Cylinder Piston Travel Sensor 1 Signal Fault | ABS Module | Go to Pinpoint Test N . |
| C1324 | Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Circuit Failure | ABS Module | Go to Pinpoint Test N . |
| C1325 | Brake Hydraulic Master Cylinder Piston Travel Sensor 2 Signal Fault | ABS Module | Go to Pinpoint Test N . |
| C1327 | Brake Fluid Level Low | ABS Module | VERIFY brake fluid level. FILL the master cylinder reservoir as necessary. INSPECT the brake system for leaks and REPAIR as necessary. If brake fluid level is OK and no leaks are found, go to Pinpoint Test M . |
| C1328 | Electro-Hydraulic General Pressure Sensor Failure | ABS Module | CLEAR the DTCs. REPEAT the self-test. If DTC C1328 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1440 | Pressure Transducer Main/Primary Signal Faulted | ABS Module | INSPECT the brake system for leaks and REPAIR as necessary. If no leaks are found, CLEAR the DTCs and REPEAT the self-test. If DTC C1440 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1471 | Brake System Volume Consumption Plausibility Failure | ABS Module | CARRY OUT the Brake System Service Bleed, REFER to BRAKE SYSTEM - GENERAL INFORMATION
article. CLEAR the DTCs and REPEAT the self-test. If DTC C1471 returns, INSTALL a new master cylinder. REFER to Brake Master Cylinder - Hybrid in HYDRAULIC BRAKE SYSTEM ACTUATION
article. CARRY OUT the Brake System Service Bleed, REFER to BRAKE SYSTEM - GENERAL INFORMATION article. CLEAR the DTCs and REPEAT the self-test. If DTC C1471 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1472 | Master Cylinder Pressure/Travel Plausibility Failure | ABS Module | CARRY OUT the Brake System Service Bleed, REFER to BRAKE SYSTEM - GENERAL INFORMATION
article. CLEAR the DTCs and REPEAT the self-test. If DTC C1472 returns, INSTALL a new master cylinder. REFER to Brake Master Cylinder - Hybrid in HYDRAULIC BRAKE SYSTEM ACTUATION article. CARRY OUT the Brake System Service Bleed, REFER to BRAKE SYSTEM - GENERAL INFORMATION article. CLEAR the DTCs and REPEAT the self-test. If DTC C1472 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1473 | Brake System Valves Calibration Data Failure | ABS Module | Using the scan tool, CARRY OUT the Brake System Air Bleed Check. CYCLE the ignition switch and CLEAR all DTCs. CARRY OUT the ABS module self-test. If DTC C1473 is still present, CARRY OUT the Brake System Service Bleed. REFER to BRAKE SYSTEM - GENERAL INFORMATION article. CYCLE the ignition switch and CLEAR all DTCs. CARRY OUT the ABS module self-test. If DTC C1473 is still present, INSTALL a new hydraulic control unit (HCU). REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1474 | High Pressure Accumulator (HPA) Sensor Calibration Data Failure | ABS Module | INSTALL a new HCU, REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1475 | High Pressure Accumulator (HPA) Pressure/Volume/Temperature Plausibility Failure | ABS Module | INSTALL a new HCU, REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1476 | Brake System Pump Volume Feed Too Low Plausibility Failure | ABS Module | CARRY OUT the Brake System Service Bleed, REFER to BRAKE SYSTEM - GENERAL INFORMATION article. CLEAR the DTCs and REPEAT the self-test. If DTC C1476 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1477 | High Pressure Hydraulic Circuit Leakage Plausibility Failure | ABS Module | CARRY OUT the Brake System Service Bleed, REFER to BRAKE SYSTEM - GENERAL INFORMATION article. CLEAR the DTCs and REPEAT the self-test. If DTC C1477 returns, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . |
| C1478 | Front Left Wheel Brake Pressure Control Plausibility Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. If no leaks are found, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . CLEAR the DTCs. REPEAT the self-test. |
| C1479 | Rear Left Wheel Brake Pressure Control Plausibility Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. If no leaks are found, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid d. CLEAR the DTCs. REPEAT the self-test. |
| C1480 | Front Right Wheel Brake Pressure Control Plausibility Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. If no leaks are found, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . CLEAR the DTCs. REPEAT the self-test. |
| C1481 | Rear Right Wheel Brake Pressure Control Plausibility Failure | ABS Module | INSPECT the brake system for leaks. REPAIR as necessary. If no leaks are found, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . CLEAR the DTCs. REPEAT the self-test. |
| C1523 | Brake Fluid Level Sensor Out of Range | ABS Module | VERIFY brake fluid level. FILL the master cylinder reservoir as necessary. INSPECT the brake system for leaks and REPAIR as necessary. If brake fluid level is OK and no leaks are found, go to Pinpoint Test M . |
| C1524 | Brake Pedal Travel Sensor Calibration Incomplete | ABS Module | After a new battery is installed, a weak battery is charged or the 12 volt battery is disconnected, the brake pedal zero position needs to be relearned. This is done by depressing and releasing the brake pedal. Typically this occurs automatically as a consequence of stepping on the brake to pull the gear selector out of Park. It is possible to keep the brake pedal partially applied, however, and drive-off. If the pedal is not fully released, the brake system remains in a mode where it cannot use the pedal position sensor. The brake system provides fully boosted brakes on the front axle and manual brakes on the rear axle. TURN the ignition key to the RUN position, PRESS and RELEASE the brake pedal. CLEAR the DTCs and REPEAT the self-test. |
| C1525 | Brake System Initialization Incomplete | ABS Module | This DTC is set if the Brake System Air Bleed Check or the Brake System Actuation Control Unit Check were interrupted (scan tool disconnected, 12-volt battery too low, etc.) and were not completed. Once both of the system checks are completed, DTC C1525 will be cleared. If necessary, CONNECT a battery charger to the vehicle 12-volt battery. CARRY OUT the Brake System Air Bleed Check and/or the Brake System Actuation Control Unit Check using the scan tool. |
| C1526 | Brake Pedal Travel Sensor Fault | ABS Module | Go to Pinpoint Test O . |
| C1998 | Module Calibration Not Complete | ABS Module | Follow the scan tool directions for the calibration procedure. |
| C2768 | Longitudinal Acceleration Sensor Electrical Failure | ABS Module | Go to Pinpoint Test I . |
| C2769 | Longitudinal Acceleration Sensor Circuit Failure | ABS Module | Go to Pinpoint Test I . |
| C2778 | Sensor Cluster Power Supply Failure | ABS Module | Go to Pinpoint Test I . |
| C2783 | Sensor Cluster Incorrect | ABS Module | Go to Pinpoint Test I . |
| U1900 | CAN Communication Bus Fault - Receive Error | ABS Module | Message from the PCM is missing. RETRIEVE and DIAGNOSE any PCM DTCs. REFER to the ENGINE CONTROLS - POWERTRAIN DTC CHARTS AND DESCRIPTIONS - (HYBRID) article. If no PCM DTCs are present, REFER to MODULE COMMUNICATIONS NETWORK SYSTEM article to diagnose the high speed communication area network (HS-CAN) bus. |
| U1901 | CAN Network #2 Communication Bus Fault - Receive Error | ABS Module | Go to Pinpoint Test I . |
| U2023 | Fault Received From External Node | ABS Module | One or more other modules are reporting a DTC. RETRIEVE DTCs from all other modules. REFER to the modules respective section for diagnosis. If no DTCs are present, REFER to MODULE COMMUNICATIONS NETWORK SYSTEM article to diagnose the HS-CAN bus. |
| U2050 | No Application Present | ABS Module | CONFIGURE the ABS module and HCU. REFER to Programmable Module Installation in MODULE CONFIGURATION SYSTEM article. CLEAR the DTCs. RETRIEVE the DTCs and VERIFY successful module configuration. If DTC U2050 is retrieved again, INSTALL a new HCU. REFER to Hydraulic Control Unit (HCU) - Hybrid . CLEAR the DTC. REPEAT the self-test. |
| U2060 | ECU Redundant Power Circuit Open | ABS Module | Go to Pinpoint Test E . |
| U2062 | ECU Redundant Ground Circuit Open | ABS Module | DISCONNECT and CLEAN the eyelets and studs of grounds G102 and G104. INSPECT ABS module C1462 for corrosion, pushed-out pins and spread terminals. REPAIR or INSTALL new as necessary. CONNECT C1462 and VERIFY that it is fully seated. CLEAR the DTC and CARRY OUT the self-test. If the DTC returns, go to Pinpoint Test E . |
| U2527 | CAN Network #2 Communication Bus Off - Transmit Error | ABS Module | Go to Pinpoint Test I . |
For a complete list of ABS module DTCs, refer to MULTIFUNCTION ELECTRONIC MODULES article.
TRANSMISSION CONTROL MODULE (TCM) DIAGNOSTIC TROUBLE CODE (DTC) CHART
| DTC | Description | Source | Action |
|---|---|---|---|
| C1218 | Lamp ABS Warning Output Circuit Failure | TCM | REPAIR all other DTCs first. CLEAR the DTCs and REPEAT the self-test. |
| C1222 | Speed Wheel Mismatch | TCM | REPAIR all other DTCs first. CLEAR the DTCs and REPEAT the self-test. |
| C1233 | Wheel Speed LF Input Signal Missing | TCM | REPAIR all other DTCs first. CLEAR the DTCs and REPEAT the self-test. |
For a complete list of TCM DTCs, refer to the appropriate TRANSMISSION article.