CORE-RDTR-YM 3769058 - Caterpillar

Illustration 1 g00601736
Schematic of the Autoshift Switch
Table 1
Switch Continuity At The ECM Connector
CID
Switch Switch
State ECM Connector
and Contact No. Switch Connector
Contact Wire No. Status
CID 0368
Autoshift
Switch Not Activated J1-21 N/O(1) N/O F848-OR(Orange) O(2)
J1-38 N/C(3) N/C F849-WH(White) G(4)
Activated J1-21 N/O N/O F848-OR(Orange) G
J1-38 N/C N/C F849-WH(White) O
(1) N/O = Normally Open.
(2) O = Open (no continuity to ground).
(3) N/C = Normally Closed.
(4) G = Grounded (Continuity to ground).The switch provides two inputs to the ECM. The inputs are Normally Open and Normally Closed. During normal operation, one of the inputs is open and the other input is grounded. A problem is detected when both inputs to the ECM are in the same state at the same time. This diagnostic code is recorded when both inputs to the ECM are in the same state at the same time. The autoshift function will not turn on when the autoshift switch is pressed and the diagnostic code is present. The possible causes of this diagnostic code are listed below:
There is an open wire between the common circuit (201-BK(Black)) and the ECM.
There is an open wire between the Normally Open contact of the switch and the ECM.
There is an open wire between the Normally Closed contact of the switch and the ECM.
The Switch has failed.
The ECM has failed. This is unlikely. Note: Ensure that the CID 0368 FMI 02 is on hold and that the diagnostic code indicator shows "SERV CODE". Test Step 1. CHECK THE CIRCUIT FOR PROPER OPERATION.
Turn the key start switch to the OFF position.
Disconnect the machine harness connectors J1 and J2 from the ECM.
At machine harness connector J1, check continuity from J1-15 (the return circuit) to the Normally Closed contact and to the Normally Open contact.
Check the continuity while the switch is activated. Check the continuity while the switch is not activated. Expected Result:The value that is measured matches the value that