Initializing Test Modes

Data-Link Connector:

- The Data Link Connector is located near shifter (See Image). The Scan Tool can be used to run different test modes, involving entering control codes or reading off stored fault and acknowledgement codes.
- All information on DTCs is held in the control module memory (EEPROM), even with the battery power off.
- Once you have read off all DTCs, you can delete them. Deleting DTCS

Connection And Initialization:
- Connect the Scan Tool (Volvo Diagnostic Key) to The Data Link Connector..
- Turn Ignition on.
- The Scan Tool will display the code(s).
- Continue with test mode 1, 2 or 4.

Code Structure:
- Each code consists of three digits. Example: code 2 3 1.
- The control module memory can hold all different DTCs simultaneously. If faults have shown up a number of times when driving, but then returned to normal (intermittent faults), the DTCs will remain stored until deleted by an input code.
- Only one code is displayed at a time. If a number of codes are stored, they are shown in ascending numerical order.
- The codes used are:
- DTCs, test mode 1.
- Acknowledgement codes, test mode 2.
- Control codes, test mode 4.
- Transmission codes, test mode 4.

Test Modes:
Test Mode 1:
- Used to 'read off' stored DTCs for faults detected by the diagnostic system.
- If display reads 1-1-1, No DTCs stored.
- If display shows a code other than 1-1-1, display all the DTCs.
- Delete DTCs, then go to fault tracing for the specific DTCs that were stored.

Test Mode 2:
- Used to see if there are signals from the solar sensor or speedometer.
- If DTC 1-1-2 is displayed, signal from solar sensor is correct.
- If DTC 1-1-3 is displayed, signal from speedometer is correct.
- If neither acknowledgement code displays, Check Solar Sensor and Check Road Speed Signal.

Test Mode 4:
- Used to control A/C Relay output (compressor ON/OFF), Self adjustment of damper motor limit positions and, on 1995 and earlier vehicles, to change the transmission speed from the control module to the On-Board Diagnostic unit. Starting in 1996 on OBDII vehicles, there is no On-Board Diagnostic unit.