CM850 Electronic Control System – 019-031   Electronic Control Module (ECM)

Turn the keyswitch to the ON position while monitoring the fault lamps. The fault lamps must illuminate for two to three seconds.

If the lamps do not illuminate, check for burned-out bulbs.

NOTE: This applies to automotive and industrial only.

Turn the keyswitch to the OFF position.

Connect an electronic service tool to the vehicle datalink.

Turn the keyswitch to the ON position.

Select the monitor mode on the electronic service tool. The electronic service tool must be able to communicate with ECM. If the ECM will not communicate with the service tool, refer to the Communication Error – Electronic Service Tool or Control Device symptom tree.

CAUTION  Record all programmable parameters, features, and calibration information from the old ECM before disconnecting the harness connectors. This information will be needed to program the new ECM.

Disconnect the ECM power, engine, and OEM harness connectors from the ECM if they are not already disconnected.

Marine Application: The OEM harness mounting plate must be removed first. To do so remove the OEM harness connector, the unswitched power supply harness and system intergration module.

Remove the capscrews that secure the ECM to the engine block.

CAUTION  Do not paint the back side of the ECM. Make sure no grease or dirt is between the ECM and the engine block.

Install the new ECM to the cooling plate. Tighten the capscrews.

CAUTION  Do not blow compressed air into the ECM ports or connectors. Compressed air can contain moisture due to condensation.

Use quick-dry electrical contact cleaner, Part Number 3824510, to remove all dirt and moisture from the ECM connector ports and the harness connectors.

Connect the ECM power, engine, and OEM harness connectors to the ECM. Tighten the connector capscrews to the ECM.

NOTE: When an ECM is replaced, the new ECM must be calibrated. Refer to Procedure 019-032.