Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSFORD2018F-450 SUPER DUTY LARIAT, 4D PICKUP CREW CAB, 4WDREPAIR AND DIAGNOSIS (SINGLE PAGE)ENGINE PERFORMANCESYSTEMENGINE CONTROLS - PINPOINT TESTS (DIESEL)PINPOINT TESTS RJ: REDUCTANT TANK LEVELINTRODUCTION
2018 Ford F-450 Super Duty Lariat, 4D Pickup Crew Cab, 4WD
Pinpoint Tests RJ: REDUCTANT Tank Level: Introduction
2018 Ford F-450 Super Duty Lariat, 4D Pickup Crew Cab, 4WDSECTION Introduction
NOTE:
Regeneration may occur during normal operation. During regeneration, diagnostic procedures may display biased values. If a regeneration occurs during diagnostic procedures, allow the process to complete before continuing diagnostics.
This pinpoint test is intended to diagnose the following:
- reductant quality module
- reductant level sensor
- harness circuits: CAN2+, CAN2-, GND, RDL1, RDL2, RDL3, SIGRTN and VPWR
- reductant dosage control module (5H298)
- PCM (12A650)
| Pin | Circuit |
|---|---|
| 3 | RDT (Reductant Temperature) |
| 5 | SIGRTN (Signal Return) |
| 8 | RDL3 (Reductant Level 3) |
| 7 | RDL2 (Reductant Level 2) |
| 6 | RDL1 (Reductant Level 1) |
| Pin | Circuit |
|---|---|
| 3 | CAN2- (Controller Area Network 2) |
| 2 | CAN2+ (Controller Area Network 2) |
| 1 | GND (Ground) |
| 4 | VPWR (Vehicle Power) |
| Pin | Circuit |
|---|---|
| 90 | SIGRTN (Signal Return) |
| 11 | RDL3 (Reductant Level 3) |
| 12 | RDL2 (Reductant Level 2) |
| 10 | RDL1 (Reductant Level 1) |
| Pin | Circuit |
|---|---|
| 39 | CAN2- (Controller Area Network 2) |
| 56 | CAN2+ (Controller Area Network 2) |
| Pin | Circuit |
|---|---|
| 36 | CAN2- (Controller Area Network 2) |
| 35 | CAN2+ (Controller Area Network 2) |
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.