B2112-5 VOLT SUPPLY CIRCUIT LOW (FCM)
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
With the ignition on.
- Set Condition:
The Front Control Module detects the (F891) 5 volt supply circuit voltage below 0.3 volts.
| Possible Causes |
| (F891) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| A/C PRESSURE TRANSDUCER |
| FRONT CONTROL MODULE |
Diagnostic Test
1.CHECK FOR ACTIVE DTCDoes the scan tool display this DTC as active?
Yes
- Go To 2
No
- If the DTC is stored, check for an intermittent condition. Visually inspect the related wiring harness connectors. Look for broken, bent, pushed out, or corroded terminals.
2.A/C PRESSURE TRANSDUCER
Does the scan tool display this DTC as active?
Yes
- Go To 3
No
- Replace the A/C Pressure Transducer in accordance with the service information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
3.(F891) 5 VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Is the resistance below 1000.0 ohms?
Yes
- Repair the (F891) 5 Volt Supply circuit for a short to ground.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).
No
- Inspect the wiring and connectors for damage or shorted circuits. If ok, replace and program the Front Control Module in accordance with the service information.
- Perform BODY VERIFICATION TEST – VER 1. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - STANDARD PROCEDURE).