Electronic Control System Gas Plus Engines – 019-031   Electronic Control Module (ECM)

Turn the keyswitch to the ON position while monitoring the fault lamps. The fault lamps will sequence.

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

Turn the keyswitch to the OFF position.

Connect an electronic service tool to the vehicle data link.

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 the ECM. If the ECM will not communicate with the service tool, refer to the Communication Error – Electronic Service Tool or Control Device symptom tree in Section TS.

NOTE: Record all of the 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.

NOTE: In some applications, it can be necessary to disconnect the ignition control module to allow access to the ECM in order to remove it.

Disconnect engine harness ECM connectors 1 and 2 from the ECM if they are not already removed.

Remove the capscrews, which hold the ECM to the engine block.

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

Install the new ECM to the engine. 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.

CAUTION  Use only Cummins-recommended lubricant DS-ES, Part Number 3822934. Other lubricants, such as lubricating oil or grease in the connectors, can cause ECM damage, poor engine performance, or premature connector pin wear.

Apply a thin coating of lubricant to the connector nosepiece.

Spread the lubricant across the connector nosepiece so it enters every pin hole and lubricates the contacts. Lubricant must not be visible on the surface of the nosepiece.

Connect engine harness ECM connector 1 and 2 to the ECM. Tighten the connector capscrews to the ECM.

After replacing the ECM, the new ECM must be calibrated.

Refer to Procedure 019-032.

Turn the keyswitch to the OFF position.

Disconnect engine harness ECM connector 2 from the ECM.

Set the multimeter to measure VDC. Turn the keyswitch to the ON position.

Measure the voltage from the sensor supply voltage +5 VDC pin in the ECM port for ECM connector 2, to engine block ground.

The voltage must be ± 0.5 VDC from the supply voltage noted on the wiring diagram.

If the voltage is more than ± 0.5 VDC above the wiring diagram listed supply voltage, replace the ECM.