CM850 Electronic Control System – FAULT CODE 187 (ISB/QSB Automotive and Industrial, ISC/QSC/ISL/QSL Automotive, Industrial, and Marine)

  Printable Version

Overview

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 camshaft engine position sensor, 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 (Engine Diagrams) in Section E 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.

On-Board Diagnostics (OBD) Information (Euro 4 Certified Engines):

• The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
• The ECM turns OFF the malfunction indicator lamp (MIL) after 3 consecutive ignition cycles that the diagnostic runs and does not fail. The MIL lamp and fault code can also be cleared using the INSITE™ service tool.
• The fault code will be cleared from memory after 40 consecutive drive cycles where the diagnostic runs and passes.

On-Board Diagnostics (OBD) Information (Euro 4 Stage 1+ Certified Engines):

• The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
• An engine torque derate will be activated after 50 hours of engine operation with the fault code active.
• The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and does not fail. The MIL lamp cannot be cleared using the INSITE™ electronic service tool.
• The fault code will be cleared from memory after 400 days or 9600 hours of engine operation.

On-Board Diagnostics (OBD) Information (Euro 4 Stage 1 + Certified Engines):

• The ECM illuminates the malfunction indicator lamp (MIL) when the diagnostic runs and fails.
• An engine torque derate will be activated after 50 hours of engine operation with the fault code active.
• The ECM turns OFF the malfunction indicator lamp (MIL) after 1 ignition cycle that the diagnostic runs and does not fail. The MIL lamp can not be cleared using the INSITE™ electronic service tool.
• The fault code will be cleared from memory after 400 days or 9600 hours of engine operation.

Refer to Troubleshooting Fault Code t05-187