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Home >> Ford Truck >> 2012 >> Explorer FWD L4-2.0L Turbo >> Repair and Diagnosis >> Restraints and Safety Systems >> Air Bag Systems >> Testing and Inspection >> Pinpoint Tests >> Diagnostic Routine Y

Diagnostic Routine Y




Diagnostic Routine Y

Diagnostic Overview

U3003:16 and U3003:17

Refer to Wiring Diagram Set 46 for schematic and connector information Electrical Diagrams.

NOTE: DTCs (Diagnostic Trouble Codes) U3003:16 and U3003:17 can be set if the vehicle has been recently jump started, the battery has been recently charged or the battery has been discharged. The battery may become discharged due to excessive load(s) on the charging system from aftermarket accessories or if the battery has been left unattended with the accessories on.

Normal Operation - RCM (Restraints Control Module)

The RCM (Restraints Control Module) continuously monitors the input voltage for correct operation. If the RCM (Restraints Control Module) detects input voltage below 9.5 volts, it stores DTC (Diagnostic Trouble Code) U3003:16 in memory. If the RCM (Restraints Control Module) detects input voltage above 16 volts, it stores DTC (Diagnostic Trouble Code) U3003:17 in memory. If the RCM (Restraints Control Module) sets DTC (Diagnostic Trouble Code) U3003:16 or U3003:17, it sends a message to the IPC (Instrument Panel Cluster) to illuminate the air bag warning indicator.

Normal Operation - OCSM (Occupant Classification System Module)

The OCSM (Occupant Classification System Module) continuously monitors the input voltage for correct operation. If the OCSM (Occupant Classification System Module) detects input voltage below 8 volts, it stores DTC (Diagnostic Trouble Code) U3003:16 in memory. If the OCSM (Occupant Classification System Module) detects input voltage above 18 volts, it stores DTC (Diagnostic Trouble Code) U3003:17 in memory. If the OCSM (Occupant Classification System Module) sets DTC (Diagnostic Trouble Code) U3003:16 or U3003:17, it sends a fault message to the RCM (Restraints Control Module). The RCM (Restraints Control Module) then sends a message to the IPC (Instrument Panel Cluster) to illuminate the air bag warning indicator.

DTC Fault Trigger Conditions






Visual Inspection and Diagnostic Pre-checks

- Inspect for damaged wiring harness(es)

- Inspect for loose or damaged connectors

Pinpoint Test

WARNING: Do not handle, move or change the original horizontal mounting position of the RCM (Restraints Control Module) while the RCM (Restraints Control Module) is connected and the ignition switch is ON. Failure to follow this instruction may result in the accidental deployment of the Safety Canopy(R) and cause serious personal injury or death.

NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

NOTE:Only disconnect or reconnect SRS (Supplemental Restraint System) components when instructed to do so within a pinpoint test step. Failure to follow this instruction may result in incorrect diagnosis of the SRS (Supplemental Restraint System).

NOTE: Install new components only when directed to do so in the pinpoint test.

NOTE: Always make sure the correct SRS (Supplemental Restraint System) component is being installed. Parts released for other vehicles may not be compatible even if they appear physically similar. Check the part number listed in the Ford Catalog Advantage or equivalent to make sure the correct component is being installed. If an incorrect SRS (Supplemental Restraint System) component is installed, DTCs (Diagnostic Trouble Codes) may set.

NOTE: The SRS (Supplemental Restraint System) must be fully operational and free of faults before releasing the vehicle to the customer.

1. RETRIEVE ALL CMDTCs (Continuous Memory Diagnostic Trouble Codes) IN ALL MODULES

1. Ignition ON.

2. Using a scan tool, retrieveALL CMDTCs (Continuous Memory Diagnostic Trouble Codes).

Is DTC (Diagnostic Trouble Code) B1317, B1318, B1676, U3003:16 or U3003:17 present in one or more modules AND are any charging system DTCs (Diagnostic Trouble Codes) present in the PCM (Powertrain Control Module)?








2. TEST BATTERY CONDITION

1. Ignition OFF.

2. Carry out the Battery Condition Test. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.

Did the battery pass the condition test?








3. CHECK THE CHARGING SYSTEM VOLTAGE

NOTE: Do not allow the engine speed to increase above 2,000 RPM (Revolutions Per Minute) while performing this step or the generator may self-excite and result in default charging system output voltage. If engine speed goes above 2,000 RPM (Revolutions Per Minute), turn the vehicle off and restart the engine before performing this step.

1. Measure the voltage of the battery:

2. For DTC (Diagnostic Trouble Code) U3003:17, turn off all accessories and run the engine at 1,500 RPM (Revolutions Per Minute) for a minimum of 2 minutes while measuring the battery voltage.

3. For DTC (Diagnostic Trouble Code) U3003:16, turn on headlights and HVAC (Heating, Ventilation, and Air Conditioning) fan on high and run engine at 1,500 RPM (Revolutions Per Minute) for a minimum of 2 minutes while measuring the battery voltage.

Is the voltage between 13 and 15.2 volts?








4. CHECK FOR OPEN IGNITION CIRCUIT TO THE MODULE

1. Ignition OFF.

2. Depower the SRS (Supplemental Restraint System). REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .

3. Disconnect OCSM (Occupant Classification System Module) C3159.

4. Disconnect RCM (Restraints Control Module) C310A and C310B.

5. For the RCM (Restraints Control Module), measure:





6. For the OCSM (Occupant Classification System Module), measure:





Is the resistance less than 1 ohm?








5. CHECK FOR OPEN GROUND TO THE MODULE

1. For the RCM (Restraints Control Module), measure:





2. For the OCSM (Occupant Classification System Module), measure:





Is the resistance less than 1 ohm?








6. CHECK FOR MODULE OPERATION

1. Depower the SRS (Supplemental Restraint System). REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .

2. Disconnect the module with the concern:

- For the RCM (Restraints Control Module), disconnect C310A and C310B.
- For the OCSM (Occupant Classification System Module), disconnect C3159.

3. Check for the following:

- corrosion
- damaged pins
- pushed-out pins

4. Connect the RCM (Restraints Control Module) C310A and C310B or OCSM (Occupant Classification System Module) C3159 and make sure the connector seats correctly and engage CPA (Connector Position Assurance) lever/lock.

5. Repower the SRS (Supplemental Restraint System). Do not prove out the SRS (Supplemental Restraint System) at this time. REFER to Supplemental Restraint System (SRS) Depowering and Repowering - with Intelligent Access (IA) or REFER to Supplemental Restraint System (SRS) Depowering and Repowering - without Intelligent Access (IA) .

6. Operate the system and verify the concern is still present.

Is the concern still present?







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