GHG17 Heavy Duty Troubleshooting Manual (DDC-SVC-MAN-0191) | 347 SPN 5488 (ACM) (GHG17) | 347.2 SPN 5488/FMI 4 – 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:
- Turn the ignition OFF.
- Disconnect the line heater/Dosing Unit 8-pin connector.
- Inspect the sensor harness for bent, spread or corroded pins.
- If the pins are bent, spread or corroded, repair as necessary.
- If the connector shows no signs of damage, Go to step 4.
- Disconnect the ACM 120-pin connector.
- Measure the resistance between pin 3 on the harness side of the line heater 8-pin connector and ground.
- 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.
- If the resistance is greater than 10K ohms, replace the Dosing Unit.
