Pinpoint Tests RH: REDUCTANT Heater: Introduction

WARNING: This page is about a different car, the 2020 Ford F-550 Super Duty, 2020 Ford F-450 Super Duty, 2020 Ford F-350 Super Duty, 2020 Ford F-250 Super Duty, and 2020 Ford F-150. However, it is still accessible from the selected car via links, so may be relevant.

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 heaters
harness circuits: GND, RDHTRC1, RDHTRC2, RDHTRC3 and RDHTRPWR
glow plug control module (GPCM)
reductant dosage control module (5H298)

Fig 1: Battery Junction Box-B (BJB-B) Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
GND (Ground)	39
RDHTRCTRL (Reductant Heater Control)	40
RDHTRPWR (Reductant Heater Power)	48

Fig 2: Reductant Pump Assembly Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
RDHTRC1 (Reductant Heater Control 1)	9
GND (Ground)	11

Fig 3: Reductant Pressure Line Heater Assembly Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
RDHTRC2 (Reductant Heater Control 2)	1
GND (Ground)	2

Fig 4: Reductant Quality Module Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
GND (Ground)	1

Fig 5: Glow Plug Control Module-B (GPCM-B) Connector

Courtesy of FORD MOTOR CO.

Harness Side

Circuit	Pin
RDHTRPWR (Reductant Heater Power)	14
RDHTRCTRL (Reductant Heater Control)	28
RDHTRC1 (Reductant Heater Control 1)	1
RDHTRC2 (Reductant Heater Control 2)	22