5488/4 DIESEL EXHAUST FLUID LINE HEATER 5 CIRCUIT FAILED LOW

GHG17 Heavy Duty Troubleshooting Manual (DDC-SVC-MAN-0191) | 347 SPN 5488 (ACM) (GHG17) | 347.2 SPN 5488/FMI 4 ā€“ GHG17

Description Line Heater 5 Circuit Failed Low
Monitored Parameter Line Heater 5 Circuit
Typical Enabling Conditions Always on
Monitor Sequence None
Execution Frequency Continuous when enabling conditions met
Typical Duration 2 Seconds
Dash Lamps MIL, CEL
Engine Reaction None
Verification Output Component Test

TROUBLESHOOTING:

  1. Turn the ignition OFF.
  2. Disconnect the line heater/Dosing Unit 8-pin connector.
  3. Inspect the sensor harness for bent, spread or corroded pins.
    1. If the pins are bent, spread or corroded, repair as necessary.
    2. If the connector shows no signs of damage, Go to step 4.
  4. Disconnect the ACM 120-pin connector.
  5. Measure the resistance between pin 3 on the harness side of the line heater 8-pin connector and ground.
    1. If the resistance is less than 10K ohms, repair the wire between pin 3 of the line heater 8-pin connector and pin 22 of the ACM 120-pin connector.
    2. If the resistance is greater than 10K ohms, replace the Dosing Unit.

DOSING UNIT

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