Pinpoint Test M : DTCS P1812:00, P1815:00
WARNING: This page is about a different car, the 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.
- M1 VERIFY THE CONCERN IS PRESENT
- Ignition ON.
- Enter the following diagnostic mode: KOEO self-test.
Did P1812 or P1815 set during the TCCM KOEO Self-test?
Yes GO to M2 No The concern is not present at this time. Visually inspect the MSS and the TCCM connectors and pins for damage, spread terminals, etc. Visually inspect the wiring harness between the TCCM and the MSS for conditions that may have caused the concern. - M2 CHECK TRANSFER PLATE CONTACT PLATE CIRCUITS FOR A SHORT TO GROUND
- Disconnect the MSS C284.
- Ignition ON.
Is the voltage greater than 12 volts?
Yes 12v is present at the MSS. GO to M6 No Voltage is NOT present at the MSS. GO to M3 - M3 CHECK THE MSS 4WD CIRCUIT FOR OPEN
- Ignition OFF.
- Disconnect the MSS C284.
- Disconnect the TCCM C2371A.
Is the resistance less than 3 ohms?
Yes The MSS 4WD circuit is intact. GO to M4 No REPAIR circuit. - M4 CHECK THE MSS 4WD CIRCUIT FOR SHORT TO GROUND
- Ignition OFF.
- Disconnect the MSS C284.
- Disconnect the TCCM C2371A.
- Measure:
Positive Lead Measurement / Action Negative Lead C284-3 Ground
Is the resistance greater than 10, 000 ohms?
Yes GO to M5 No REPAIR Circuit. - M5 CHECK FOR VOLTAGE AT THE TCCM
- Ignition OFF.
- Disconnect the TCCM C2371B.
Is the voltage greater than 12 volts?
Yes The TCCM is not passing voltage through to the MSS. INSTALL a new TCCM. REFER to: Transfer Case Control Module (TCCM) . No INSPECT the TCCM VBATT fuses. If fuse(s) are OPEN, locate and repair short to ground. If fuses are intact, REPAIR Circuit. - M6 CHECK THE MSS RESISTANCE VALUES
- Ignition OFF.
- Disconnect MSS C284.
- Refer to tables below, measure:
Positive Lead Measurement / Action Negative Lead MSS pin 2 component side. MSS, pin 3 component side. MSS Position Resistance (+/-1%) 2H 619 ohms 4A (Torque on Demand only) 270 ohms 4H 130 ohms 4L 62 ohms
Is the resistance within specification in each position?
Yes GO to M7 No INSTALL a new MSS. REFER to: Mode Select Switch (MSS) - Raptor . - M7 CHECK THE MSS 4WD AND MSS RTN CIRCUITS FOR HIGH RESISTANCE
- Ignition OFF.
- Disconnect the TCCM C2371A.
- Disconnect the MSS C284.
Is the resistance less than 3 ohms?
Yes The MSS circuits do NOT have excessive resistance. GO to M8 No REPAIR Circuit - M8 CHECK THE MSS 4WD AND MSS RTN CIRCUITS FOR A SHORT TOGETHER
- Ignition OFF.
- Disconnect the TCCM C2371A.
- Disconnect the MSS C284.
Is the resistance greater than 10, 000 ohms?
Yes The fuses, wiring harness and MSS hare working correctly. GO to M9 No REPAIR the affected circuit(s). CLEAR the DTCs. - M9 CHECK FOR CORRECT TCCM OPERATION
- Ignition OFF.
- Disconnect and inspect all TCCM connectors.
- Check for the following:
- 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
- Refer to TWO WHEEL DRIVE/FOUR WHEEL DRIVE SYSTEMS for schematic and connector information. and verify module ground to vehicle ground connection.
- Connect all TCCM connectors. Make sure they seat and latch correctly.
- Operate the system and verify the concern is still present.
Is the concern still present?
Yes INSTALL a new TCCM. REFER to: Transfer Case Control Module (TCCM) . No The system is operating correctly at this time. Concern may have been caused by a loose or corroded connector. ADDRESS the root cause of the connector or pin issues.