950K, 962K, 966K, 972K and 980K Wheel Loaders VIMSTM 3G / Product Link Caterpillar

MID 161 - VIMS^TM 3G Main ECM

CID 0890 - Telemetry Data-Link

FMI 09 - Abnormal Update Rate

Illustration 1	g02533936
VIMSTM 3G Main ECM Product Link circuit

Note: MID 161 is generated by one ECM, this ECM is referred to as the following in various venues:

• Communication Gateway 1 ECM

• VIMS Main Module, in Caterpillar® Electronic Technician Cat® (ET)

• VIMS 3G Main ECM, in this publication

This diagnostic code is recorded when data-link for telemetry from the VIMS 3G Main ECM has an abnormal update rate.

Test Step 1. VERIFY THAT THE BROADCAST SYSTEM IS FUNCTIONING CORRECTLY

1. Verify that the broadcast system (transmitter) is operating correctly.

Expected Result:

The broadcast system (transmitter) is operating correctly.

Results:

• YES - The broadcast system is operating correctly. Proceed to Test Step 2.

• NO - The broadcast system is not operating correctly.

  Repair: Repair the broadcast system.

  STOP

Test Step 2. CHECK FOR AN OPEN IN THE HARNESS

1. Turn off the keyswitch and the disconnect switch.

2. Disconnect the connector from the VIMS 3G Main ECM .

3. Disconnect the RS232 port from the broadcast system.

4. Measure the resistance of the circuits listed in Table 1:
   Show/hide table

   Table 1

   VIMS 3G Main ECM		RS232 Broadcast Port
   Contact 27 (wire N691-OR)	to	Contact 5 (wire N691-OR)
   Contact 35 (wire N958-PK)	to	Contact 7 (wire N958-PK)
   Contact 43 (wire N980-GN)	to	Contact 8 (wire N980-GN)

Expected Result:

All resistance is low.

Results:

• OK - All resistance is low. Proceed to Test Step 3.

• NOT OK - All resistance is not low.

  Repair: Repair or replace the harness.

  STOP

Test Step 3. CHECK THE HARNESS FOR SHORTS TO GROUND

1. Verify that the disconnect switch is off.

2. Verify that the harness remains disconnected from the VIMS 3G Main ECM and the broadcast system.

3. Measure the resistance from frame ground to the contacts on the connector for the following VIMS 3G Main ECM contacts:
   • Contact 27 (wire N691-OR).

   • Contact 35 (wire N958-PK).

Expected Result:

All resistance is high.

Results:

• OK - All the resistance is high. The ECM may have failed. However, ECM failure is unlikely.

  Repair: Exit this procedure and perform this procedure again. Contact your Cat dealer before replacing an ECM. If ECM replacement is necessary, see the Testing and Adjusting, "Electronic Control Module (ECM) - Replace" Section of this manual.

  STOP

• NOT OK - A resistance is low.

  Repair: Repair or replace the harness.

  STOP