CM850 Electronic Control System – FAULT CODE 1697

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Overview

Circuit: Aftertreatment #1 Air Enable Actuator SMALL | MEDIUM | LARGE

Circuit Description

The aftertreatment #1 air solenoid is used to enable and disable the truck air supply to the dosing control unit. The air is used to transport the catalyst solution to the catalyst nozzle.

Component Location

The aftertreatment #1 air solenoid is mounted to the back of the dosing control unit. The dosing control unit is OEM mounted.

Shop Talk

This fault code is logged when the supply voltage to the air solenoid is greater than +12 volts.

Possible causes of this fault code include:

• Air solenoid signal wire shorted to a voltage supply
• Failed dosing control unit.

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™ service tool.
• The fault code will be cleared from memory after 400 days or 9600 hours of engine operation.

Refer to Troubleshooting Fault Code t05-1697