CAMSHAFT A 7C6950 - Caterpillar

MID 087 - Chassis ECMCID 1960 - Ignition Key ReaderFMI 09 - Abnormal Update Rate
Illustration 1 g01916935
"Machine Security System (MSS) Key Reader" "CAN Data Link" connection
This diagnostic code indicates the "Chassis" ECM is not receiving expected information from the key reader module. The communication is over the "CAN Data Link".System Response:The "Chassis" ECM is equipped with LED indicators that serve as a self-diagnostic check. With the key switch in the on position, the indicator lights indicate the following:
If all the LED lights are off, power is not being supplied to the "Chassis" ECM. Check the "Chassis" ECM power supply.
If the yellow LED is on, a communication error exists at the "CAN Data Link" circuit.
If the yellow LED is flashing, the "Chassis" ECM may not be loaded with software.
If the red LED is flashing, the "Chassis" ECM must be replaced.Note: The following test procedure may create other diagnostic codes. Ignore these created codes and clear these created codes after the original diagnostic code has been corrected. Ensure diagnostic code CID 1960 FMI 09 is active before performing this procedure.Test Step 1. CHECK FOR POWER TO THE KEY READER MODULE
Turn on the disconnect switch and the key switch.
Check for voltage between pin 1 (wire 308-YL(Yellow)) and pin 2 (wire 200-BK(Black)) of the module for the key reader.Expected Result:The voltage is approximately system voltage.Results:
OK - The voltage is approximately system voltage. Proceed to Test Step 3.
NOT OK - The voltage is not approximately system voltage. The wiring harness has failed.Repair: Repair or replace the harness.STOPTest Step 2. CHECK THE CAN DATA-LINK WIRING FOR AN OPEN
Disconnect the harness connectors from the "Chassis" ECM.
On the J2 harness connector for the "Chassis" ECM, install a jumper wire between pin 3 and pin 4.
Measure the resistance between the following contacts of the harness connectors for