(NB) Diagnostic Trouble Codes (DTC) 2-1-1

NB. 2-1-1 Power Supply Or Control Module Fault







Diagnostic trouble code (DTC) information DTC 2-1-1 is posted if the power supply or ground connection is faulty or if there is a fault in the control module. If the power to the control module is less that 10.5 volts or more than 16 volts, the unit will not operate. Fault tracing begins with NB1.


NB1. Control Module Ground Connection Test


Ignition off.
Disconnect control module.
Using an ohmmeter, measure the resistance between control module socket terminal 3B and ground.
The ohmmeter should read about 0 ohm.

If reading is OK:
Power supply test NB2.

If reading is not OK:
Check the line between control module socket terminal 3B and ground for breaks, according to QA2. (Q) Other Electrical Fault Tracing



NB2. Power Supply Test






Ignition off.
Disconnect control module.
Ignition on.
Using a voltmeter, measure voltage between control module socket terminals 1B and 3B.
Voltmeter should display battery voltage.

If reading is OK:
Try a new control module.

If reading is not OK:
Fuse check NB3.


NB3. Fuse Check






Check that fuse 19 in the central electronics module (inside the car) is intact.

If fuse is intact:
Check the cable between fuse 19 and control module for breaks, according to QA2.

If fuse is blown:
Check cables between: fuse 19 and switch terminal 2, fuse 19 and control module terminal 1B, switch terminal 1 and brake valve.

Automatic transmission: brake valve and control module terminal 9E, manual transmission: brake valve and clutch valve, manual transmission: clutch valve and control module terminal 9E.

Switch terminal 3 and control module terminal 6E, switch terminal 4 and control module terminal 8E, switch terminal 5 and control module terminal 4E for short circuits to ground, according to QA3.