CM850 Electronic Control System – FAULT CODE 187 (QSB Marine Application)

Sensor Supply 2 Circuit – Voltage Below Normal, or Shorted to Low Source


Overview

CODE REASON EFFECT
Fault Code: 187
PID: S232
SPN: 1080
FMI: 4/4
LAMP: Amber
SRT: 

Sensor Supply 2 Circuit – Voltage Below Normal, or Shorted to Low Source. Low voltage detected at the sensor supply number 2 circuit.

Marine: None, no engine protection for circuit or sensor failure.

Sensor Supply Number 2 Circuit
SMALL | MEDIUM | LARGE

Circuit Description

The sensor supply number 2 pin of the electronic control module (ECM)
provides +5 VDC for the intake manifold pressure sensor, and rail fuel pressure sensor.

Component Location

The sensor supply number 2 is located in the ECM.

Refer to Procedure 100-002 for a detailed component location view of each sensor.

Shop Talk

Low voltage on the +5-VDC supply line can be caused by a short circuit to ground in a supply line, a short circuit between a supply line or a return line, a failed sensor, or a failed ECM power supply.

Refer to Troubleshooting Fault Code t05-187

Last Modified:  08-Jul-2010