Volvo Maintenance Hints for 7xx/9xx - Bill Garland's Nuclear ...

for OBD-I (pre-1996) 960 cars.
1. Open DLC, (Diagnostic Link Connector) insert Test lead into hole #1.
2. KEY IN position 2, engine NOT running.
3. Push and hold DLC button for >1second, but, 5sec. release, wait for LED to light, then hold
button for >5 sec again. And you are cleared.
There is also a self-test mode 3 you can enter which is a two man job. One enters the
code through the DLC and the other guy is under the car feeling for each solenoid and
other device to activate in sequence. Then, you can run through all the gear positions and
modes and the DLC will respond with a code that shows the input was good or not. Good
for isolating bad components.
Diagnostic Trouble Code Table for AW 30/40 Series Transmissions: Mode 1
1-1-
1
1-1-
2
1-1-
3
1-1-
4
1-2-
1
1-2-
2
1-2-
3
1-2-
4
No faults found by onboard diagnostic
(OBD) system
Solenoid S1 short-circuit to battery
voltage
Transmission control module (TCM)
fault
Program selector open-circuit or shortcircuit
to ground
Solenoid S1 short-circuit to ground or
control module fault
Solenoid S1 open-circuit
Solenoid STH short-circuit to battery
voltage
Mode selector faulty or short-circuit to
ground