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Ignition Bus Relay Circuit
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Overview
| CODE | REASON | EFFECT |
| Fault Code: 339 PID: S087, 4 SPN: 1267 FMI: 4 LAMP: Yellow SRT: |
Less than 6 VDC detected at the ignition bus relay output circuit when the high voltage was expected by the ECM. |
The ICON™ will be disabled. Only mandatory shutdown will be enabled. Constant power will be at the keyswitch ignition circuit. |
 Idle Shutdown Vehicle Accessory/Ignition Bus Relay Circuit
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Circuit Description
The ignition bus relay controls ignition circuits powering the heating/air conditioning controls and other equipment connected to the ignition bus relay(s). This relay(s) is controlled by ignition relay positive (+) signal from the ECM OEM connector pin 35.
Component Location
The ignition bus relay is located under the dash inside the vehicle cab.
Shop Talk
This fault typically indicates a short circuit to ground or an open circuit from the ECM connector pin 35 (ignition relay positive (+)). Ignition relay positive (+) (pin 35) outputs 12 VDC to open the ignition bus relay(s)
when ICON™ has powered down the vehicle and needs to disconnect power going to the cab circuit. The ICON™ bus relay(s) is normally closed when no power is applied.
Refer to Troubleshooting Fault Code t05-339
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