9-5 Linear (9600) L4-2.3L Turbo (2.3t) (2004)
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The ESP has extremely good diagnostics for its wheel sensors. This means that with a high degree of certainty the wheel speed signals will be
present on the control module's four outputs if no diagnostic trouble codes have been generated in the system.
Neither the main instrument panel nor any of the other bus systems have speed signal diagnostics for the LH rear wheel. If the speedometer is
working, however, it is certain that speed information is present on the bus and consequently available to all systems connected to the bus.
If the speedometer does not work, the speed on a bus is constantly 0, and there are no DTCs in the ESP, it is most likely that the ESP is missing
from the bus.
The PSG 16 (diesel) includes diagnostics for the speed signal from the front right wheel.
2. Immobilization
When the ignition is turned on. TWICE checks that the right key is inserted in the ignition switch. A circuit built into the remote control part of the
key sends a code by means of inductance to a coil round the ignition switch under the centre console. The code is passed on to the control module
which checks that it is correct. TWICE also checks that the right MIU is fitted in the car. MIU continuously sends out an ID number on the bus.
If the key and the MIU's ID number are OK, TWICE sends out the message "Immobilization OFF" on the bus. This information is used by Trionic
which cancels fuel shut-off, which is always activated every time the ignition is switched on.
Diagnosis
When TWICE, MIU or the Trionic control module is replaced, immobilization must be reprogrammed in TWICE. If this is not done, the engine
cannot be started and DTC P1460 is set in Trionic.
If immobilization is not reprogrammed in TWICE, the following DTCs are set in TWICE: DTC B1780 with replacement of Trionic, DTC B1782
with replacement of MIU.
If the diagnostic trouble code is generated even though programming was carried out, fault diagnosis will have to be carried out on the
immobilization function in TWICE.
3. A/C