PINPOINT TEST I: THE 4x4 LOW INDICATOR IS ALWAYS ON
WARNING: This page is about a different car, the 2005 Ford Pickup, 2005 Ford F550 Super Duty, 2005 Ford F450 Super Duty, and 2005 Ford Cab & Chassis. However, it is still accessible from the selected car via links, so may be relevant.
- I1 MONITOR THE 4x4 LOW INDICATOR
- Verify the vehicle is in 2WD mode.
- Observe the 4x4 LOW indicator.
- Disconnect: 4WD Control Module C281b.
- Key in ON position.
- Does the 4x4 LOW indicator go off?
- Yes : GO to I6.
- No : GO to I2.
- I2 CHECK THE INSTRUMENT CLUSTER
- Disconnect: Instrument Cluster C220c.
- Does the 4x4 LOW indicator go off?
- Yes : GO to I3.
- No : REPAIR the instrument cluster as necessary. REFER to INSTRUMENT CLUSTER . TEST the system for normal operation.
- I3 CHECK CIRCUIT 975 (BN/YE) FOR A SHORT TO GROUND
- Measure the resistance between 4WD control module C281b pin 11, circuit 975 (BN/YE), harness side and ground.
- Is the resistance greater than 10,000 ohms?
- Yes : GO to I4.
- No : REPAIR the circuit. TEST the system for normal operation.
- I4 CHECK THE PCM
- Disconnect: PCM C175.
- Does the 4x4 LOW indicator go off?
- Yes : GO to I5.
- No : REPAIR circuit 784 (LB/BK). TEST the system for normal operation.
- I5 CHECK FOR CORRECT PCM OPERATION
- Check for:
- corrosion
- pushed-out pins
- Connect any disconnected connectors making sure they seat correctly.
- Make sure all other system connectors are fully seated.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new PCM. REFER to ELECTRONIC ENGINE CONTROLS - GASOLINE ENGINES for gasoline engine or ELECTRONIC ENGINE CONTROLS - DIESEL ENGINE for diesel engine. TEST the system for normal operation.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
- Check for:
- I6 CHECK FOR CORRECT MODULE OPERATION
- Check for:
- corrosion
- pushed-out pins
- Connect any disconnected connectors making sure they seat correctly.
- Make sure all other system connectors are fully seated.
- Operate the system and verify the concern is still present.
- Is the concern still present?
- Yes : INSTALL a new 4WD control module. REFER to FOUR-WHEEL DRIVE (4WD) CONTROL MODULE in this section. CLEAR the DTCs. REPEAT the self-test.
- No : The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.
- Check for: