DTC 72

DTC 72 IPC serial Data Line Malfunction






Circuit Description

Code 72 will set and the "Traction Disabled" message will appear if communication between the EBTCM and the IPC is lost.

DTC will set when

Loss of serial data communications between the EBTCM and the IPC.

Action Taken

1. Code set.
2. TCS switched "OFF".
3. "TRACTION DISABLED" message ON.

Test Description

Test numbers refer to circled numbers on the diagnostic chart.

1. This test checks to see if the off-board device can communicate with the EBTCM.
2. This test checks for a short to battery in the serial data circuit.
3. This test checks for a short to ground in the serial data circuit.
4. This test checks for an open in the serial data circuit.
5. This test re-checks if the off-board device can now communicate with the EBTCM.
6. Checks the connectors at the EBTCM and DLC for damage or misalignment. If the connectors are OK, the EBTCM is at fault.

Diagnostic Aids

The problem may be intermittent. Try performing the tests shown while "wiggling" wiring and connectors; this can often cause the fault to appear.

IMPORTANT: DTC 72 will never be displayed while serial data fault is current. A current Code 72 will result in a "NO TCS DATA", and "TRACTION DISABLED" messages as well as IPC Code I032.