FREE REPAIR MANUALS & LABOR GUIDES 1982-2013 Vehicles
Courtesy of Operation CHARM: Car repair manuals for everyone.
Home >> Ford Truck >> 2012 >> Explorer FWD L4-2.0L Turbo >> Repair and Diagnosis >> Starting and Charging >> Starting System >> Testing and Inspection >> Pinpoint Tests >> Diagnostic Routine B

Diagnostic Routine B




Diagnostic Routine B

Diagnostic Overview

Engine Does Not Crank (With Intelligent Access)

Refer to Wiring Diagram Set 20 for schematic and connector information Electrical Diagrams.

Refer to Wiring Diagram Set 90 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

When the start/stop switch is pressed in combination with the brake pedal, the RFA (Remote Function Actuator) module, BCM (Body Control Module) and PCM (Powertrain Control Module) receive signals to crank and start the engine. The PCM (Powertrain Control Module) and RFA (Remote Function Actuator) module received notification from the TR (Transmission Range) sensor that the gear selector is in PARK or NEUTRAL. The PCM (Powertrain Control Module) then supplies voltage and ground to the starter relay coil. The energized coil causes the starter relay contacts to close. This allows voltage to be supplied from the BJB (Battery Junction Box) to the starter solenoid coil. The starter solenoid coil is grounded at the starter motor. Energizing the starter solenoid closes the solenoid contacts allowing voltage directly from the battery to the starter motor, engaging the starter drive into the ring gear causing the engine to crank. The PCM (Powertrain Control Module) disengages the starter motor once an engine RPM (Revolutions Per Minute) threshold is reached, a set crank time is exceeded or the start/stop switch is pressed indicating an engine shutdown.

Visual Inspection and Diagnostic Pre-checks

- Inspect the battery.

- Inspect the battery cables.

- Inspect BJB (Battery Junction Box) fuse 19 (30A).

- Inspect BCM (Body Control Module) fuse 28 (15A).

- Inspect the starter motor.

- Inspect high current battery junction box connections.

- Inspect the starter motor.

- Inspect the starter relay.

- Inspect the start/stop switch.

Special Tool(s)






Pinpoint Test

1. CHECK THE BATTERY

1. Check the battery condition and state of charge. REFER to Diagnostic Routine A: Battery Condition Test Pinpoint Tests.

Is the battery OK?






2. CHECK FOR NO KEY DETECTED MESSAGE IN THE MESSAGE CENTER

1. NOTE: There are certain areas inside the vehicle where the IA (Intelligent Access) key may not be detected and the message center displays NO KEY DETECTED. If the IA (Intelligent Access) key is in the far outside edges of the interior (like in a door map pocket or above a sun visor) it might not be detected. Move the IA (Intelligent Access) key to a different location and try to start the vehicle again.
Check the message displayed in the message center while pressing the start/stop switch.

Is NO KEY DETECTED displayed in the message center?






3. CHECK THE IPC (Instrument Panel Cluster) OPERATION

1. Observe the IPC (Instrument Panel Cluster) operation while pushing the start/stop switch.

Do some indicators in the IPC (Instrument Panel Cluster) illuminate?






4. CHECK FOR COMMUNICATION WITH THE SCAN TOOL

1. Using a scan tool, perform the Network Test.

Does the RFA (Remote Function Actuator) module and BCM (Body Control Module) pass the Network Test?






5. RETRIEVE DTCs (Diagnostic Trouble Codes)

1. Ignition ON.

2. Using a scan tool, perform the self-tests for:

- PCM (Powertrain Control Module).
- BCM (Body Control Module).
- RFA (Remote Function Actuator) module.

Were DTCs (Diagnostic Trouble Codes) retrieved on-demand during self-test?






6. CHECK THE CRANK FACTOR BRAKE (Crk_Fact_Brk) PID (Parameter Identification)

1. Using a scan tool, view the RFA (Remote Function Actuator) module PIDs (Parameter Identifications).

2. While observing the RFA (Remote Function Actuator) module PID (Parameter Identification) Crk_Fact_Brk, apply the brake pedal.

Does the PID (Parameter Identification) read YES when the brake was applied?






7. CHECK THE OPERATION OF THE STOPLAMPS

1. While observing the stoplamps, apply the brake pedal.

Do the stoplamps illuminate?






8. CHECK THE BPP (Brake Pedal Position) SWITCH CIRCUIT FOR VOLTAGE AT THE RFA (Remote Function Actuator) MODULE

1. Ignition OFF.

2. Disconnect: RFA (Remote Function Actuator) module.

3. While pressing the brake pedal, measure:





Is the voltage greater than 11 volts?






9. CHECK THE IN GEAR-TRANSMISSION IS APPLYING A LOAD TO ENGINE (IN_GEAR) PID (Parameter Identification)

1. Using a scan tool, view the PCM (Powertrain Control Module) PIDs (Parameter Identifications).

2. While observing the PCM (Powertrain Control Module) PID (Parameter Identification) IN_GEAR, place the gear selector in PARK and then NEUTRAL.

Does the PID (Parameter Identification) read NO in both positions?






10. CHECK THE ENGINE CRANKING (ENG_CRANK) PID (Parameter Identification)

1. Using a scan tool, view the PCM (Powertrain Control Module) PIDs (Parameter Identifications).

2. Make sure the transmission is in PARK or NEUTRAL.

3. While pressing the start/stop switch and the brake pedal, using a scan tool, monitor the PCM (Powertrain Control Module) PID (Parameter Identification) ENG_CRANK.

Does the PID (Parameter Identification) change from Inactive to Active?






11. CHECK THE STARTER RELAY CONTROL OPERATION

NOTICE: The following step uses a test light to simulate normal circuit loads. Use only the test light recommended in the Special Tools table at the beginning. To avoid connector terminal damage, use the Flex Probe Kit for the test light probe connection to the vehicle. Do not use the test light probe directly on any connector.

1. Ignition OFF.

2. Disconnect: Starter Relay.

3. Measure:





4. Make sure the transmission is in PARK or NEUTRAL.

5. While pressing the start/stop switch and the brake pedal, observe the test light.

Does the test light illuminate when the start/stop switch and brake pedal are pressed?






12. CHECK THE VOLTAGE TO THE STARTER RELAY

1. Ignition OFF.

2. Disconnect: Starter Relay.

3. Measure:





Is the voltage greater than 11 volts?






13. CHECK THE STARTER MOTOR OPERATION AT THE STARTER RELAY

1. With the gear selector in PARK or NEUTRAL, momentarily connect a fused jumper wire:





Did the starter engage and the engine crank?






14. CHECK THE BATTERY GROUND CABLE

1. Measure:





Is the voltage greater than 11 volts?






15. CHECK THE STARTER MOTOR GROUND

1. Measure:





Is the voltage greater than 11 volts?






16. CHECK THE VOLTAGE TO THE STARTER MOTOR

1. Measure:





Is the voltage greater than 11 volts?






17. CHECK THE STARTER MOTOR FOR CORRECT OPERATION

1. With the gear selector in PARK, momentarily connect a fused jumper wire:





Did the starter engage and the engine crank?






18. CHECK FOR START INPUT AT THE STARTER

1. Connect: Starter Relay.

2. Disconnect: Starter Solenoid C197B ("S" terminal).

3. With the gear selector in PARK, press the brake and the start/stop switch.

4. Measure:





Is the voltage greater than 11 volts?






19. CHECK THE PCM (Powertrain Control Module) START CIRCUITS FOR A SHORT TO GROUND

1. Ignition OFF.

2. Disconnect: ACM (Audio Control Module) C240A.

3. Disconnect: PCM (Powertrain Control Module) C1381B (2.0L) or PCM (Powertrain Control Module) C175B (3.5L).

4. For 2.0L measure:





5. For 3.5L, measure:





Are the resistances to ground greater than 10,000 ohms?






20. CHECK THE PCM (Powertrain Control Module) START CIRCUITS FOR AN OPEN

1. For 2.0L measure:





2. For 3.5L measure:





Are the resistances less than 3 ohms?






21. CHECK THE START CIRCUIT FOR VOLTAGE AT THE PCM (Powertrain Control Module)

1. Ignition OFF.

2. Disconnect: PCM (Powertrain Control Module) C1381B (2.0L) or PCM (Powertrain Control Module) C175B (3.5L).

3. Ignition ON.

4. For 2.0L, while pressing the start/stop switch, measure:





5. For 3.5L, while pressing the start/stop switch, measure:





Is the voltage greater than 11 volts?






22. CHECK THE ENGINE START STOP BUTTON CIRCUIT 1 (START_STOP_1) PID (Parameter Identification)

1. Using a scan tool, view the BCM (Body Control Module) PIDs (Parameter Identifications).

2. While pressing the start/stop switch, monitor the BCM (Body Control Module) PID (Parameter Identification) START_STOP_1.

Does the PID (Parameter Identification) read correctly?






23. CHECK FOR CORRECT RFA (Remote Function Actuator) MODULE OPERATION

1. Ignition OFF.

2. Disconnect and inspect all RFA (Remote Function Actuator) module connectors.

3. Repair:

- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

4. Reconnect the RFA (Remote Function Actuator) module connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?






24. CHECK FOR CORRECT PCM (Powertrain Control Module) OPERATION

1. Ignition OFF.

2. Disconnect and inspect all PCM (Powertrain Control Module) connectors.

3. Repair:

- corrosion (install new connector or terminals - clean module pins)
- damaged or bent pins - install new terminals/pins
- pushed-out pins - install new pins as necessary

4. Reconnect the PCM (Powertrain Control Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine if the concern is still present.

Is the concern still present?





pro multis Credits:Operation CHARM About Operation CHARM