Illustration 91 Circuit schematic for the speed/timing sensors

255

TM 9-2320-312-24-2

Troubleshooting Section

If a replacement of the ECM is required, the

ECM parameters and the timing calibration can

be transferred from the suspect ECM to the

replacement ECM. Timing calibration will not be

necessary. This feature requires an electronic

service tool and this feature is only possible if the

existing ECM can communicate with the electronic

service tool. Use the procedure "Copy Configuration

- ECM Replacement" on the electronic service

tool. Refer to Troubleshooting, "Programming

Parameters" for more information.

When the sensors are being installed, complete

all of the following tasks:

Lubricate the O-ring with oil.

Ensure that the sensor has a face seal inside the

connector body. If a seal is damaged or missing,

replace the seal.

Ensure that the sensor is fully seated into the

engine before tightening the bracket bolt.

Ensure that the connector is latched on both

sides.

Ensure that the harness is properly secured,

and ensure that the harness is attached to the

harness clip.

g00866705

Illustration 91

Circuit schematic for the speed/timing sensors

Test Step 1. Connect the Electronic

64-11 No Pattern on Speed Sensor #2 (34)

Service Tool and Note all Active

Diagnostic Codes and Logged Diagnostic

190-02 Loss of Engine RPM Signal (34)

Codes

190-11 No Pattern on Speed Sensor #1 (34)

A. Connect the electronic service tool to the cab

data link connector.

B. Turn the ignition key switch to the ON position.

C. Check for one of the following logged diagnostic

codes or active diagnostic codes:

64-02 Loss of Engine RPM Signal #2 (34)