Diagnostic functions
The following functions can be used via VIDA, reading off/erasing diagnostic trouble codes (DTCs), reading off/erasing customer parameters and reading off input and output signals.
Scheme 4
Diagnostic information via the display in the combined instrument panel
The aim of this function is to increase the quality of repairs and reduce the lead times for fault-tracing/repair and verification after repairs both in the factory and at the dealership.
By using this function one can quickly discover, without connecting an external instrument, whether
- the car is OK or not.
- which module/s the diagnostic trouble codes (DTCs) are stored in.
- which module/s have not gone through all their diagnostic functions.
For further fault-tracing (reading off codes etc.) VIDA must be connected to the car.
For the function to be initiated the car speed must be 0 km/h (0 mph). When the network is in transport position the function is initiated directly the ignition is switched on.
In normal position the function is initiated by
- turning the ignition key to position II.
- hold the button ENTER (at the end of the left steering wheel stalk) pressed in at the same time as the switch for the rear fog lamps is pressed in twice within two seconds.
The function is automatically interrupted
- when all messages are read off and acknowledged (press ENTER to acknowledge and scroll to the next message).
- if the start key is turned to position I or 0.
When the function is initiated the following occurs
- Central Electrical Module requests status information from the master modules.
- if necessary the Central Electrical Module reads off the configuration to determine which modules are included. (requirement = reply missing from a module).
- Central Electrical Module reads information and sends a message to the DIM which displays it.
Diagnostic texts which can be displayed in the display
The current status is always displayed in the first row of the display - if the diagnostic trouble codes (DTCs) are stored. If a new diagnostic trouble code (DTC) is found there is a sound signal.
Additional information is displayed on the second row, for example XXX NOT CHECKED.
XXX in the table below = three character abbreviation for the affected module, for example Rear Electronic Module (REM).
| CHECKING DTCs | Displayed for at least 2 seconds when the function is initiated. |
|---|---|
| NO DTCs SET ALL ECUs READY | All DTC messages = 0 (No DTCs). and all readiness bits = 1 (ready). |
| NO DTCs SET | All DTC messages = 0 (No DTCs). at least one readiness bit = 0 (not ready). |
| NO DTCs SETXXX CHECKING | All DTC messages = 0 (NO DTCs). Module XXX is running diagnostic function check. |
| NO DTCs SETXXX READY | All DTC messages = 0 (NO DTCs). Module XXX has run diagnostic function check - ready message = 1 (ready). |
| NO DTCs SETXXX NOT CHECKED | All DTC messages = 0 (NO DTCs). Module XXX not checked - status information missing. |
| DTCs IN VEHICLE | A DTC message = 1 (DTC stored in at least one module). |
| DTCs IN VEHICLE NO DTCs SET | A DTC message = 1 (DTC stored in at least one module). DTC stored in module XXX. |
| DTCs IN VEHICLEXXX CHECKING | A DTC message = 1 (DTC stored in at least one module, but not in XXX). Module XXX is running diagnostic function check. |
| DTCs IN VEHICLEXXX READY | A DTC message = 1 (DTC stored in at least one module, but not in XXX). Module XXX has run diagnostic function check - ready message = 1 (ready). |
| DTCs IN VEHICLEXXX NOT CHECKED | A DTC message = 1 (DTC stored in at least one module, but not in XXX). Module XXX not checked - status information missing. |
| No text = diagnostic function have been exited or are not active. All messages have been read and acknowledged. |
Scheme 5
Diagnostics
Faults are then read off via the data link connector (DLC) using Volvo's VIDA diagnostic system.
The fault message is displayed in the text display to the left of the combined instrument panel.
Scheme 6
Fault messages, Diagnostics
The status of ABS, brake force distribution (EBD) and stability traction control is indicated via warning lamps and a text message displayed in the combined instrument panel.
This information is a primary aid for workshop personnel when fault-tracing. More thorough fault-tracing is carried out using VIDA.
Scheme 7
- Link arm
- Steering limiter, roller
- Steering limiter, arm
- Hub
The front wheel suspension is of the McPherson type an A shaped lower control arm.
A new type of two part steering limiter has been introduced. An arm (3) is screwed into place on the steering knuckle, which at the steering limit comes into contact with a roller (2), screwed into place on the lower control arm, which limits the steering lock. This solution removes noise at full wheel deflection and springing. (The rollers are available in 3 different sizes).
The steering gear has an integrated limiter as a supplement (3 different versions).
If there is a fault in the system, dependent on the step motor, it remains in the position where the fault occurred.
A fault indication to the driver is displayed with both a warning lamp and a text message in the display. This information is a primary aid for workshop personnel when fault-tracing.
More thorough fault-tracing is carried out using VIDA.
- Read off/Erase diagnostic trouble codes (DTCs).
- Activate limit position step motor.
Note. In case of a fault in the stepper motor, valve housing or steering gear the complete unit must be replaced. (The steering gear is calibrated with the valve housing and stepper motor in the factory.)
Steering column
When the S/V70 was introduced a new type of steering column which collapsed at both the front and rear in a collision was used.
The steering column has modified mountings, but is otherwise the same.
The steering wheel is both radially and axially adjustable.
The lower steering shaft is telescopic, which means that it compresses in three stages, depending on the nature of the collision.
Note. No repairs to the steering column and steering shaft are permitted, they are replaced solely as a complete unit. When carrying out work on the front suspension which affects the lower steering shaft it must be disconnected. (There is a risk of damage to the telescopic joint).
Scheme 8
The design of the P23 builds on the same principle of the basic design of the S70 bodywork. Front and rear crumple zones to absorb the collision forces. The passenger compartment has the obligatory safety cage, with reinforced door sills, posts, cantrails and doors.
There are lengthwise reinforcement beams on both sides of the front section of the transmission tunnel. These have the task of preventing the engine from entering the passenger compartment in event of a collision.
Compared to the S70 the proportion of galvanized steel has been reduced from 80% to 70% whereas the proportion of HSS steel has been increased from 30% to 40%.
A car body with very high torsional stiffness -18.6 KNm/degree (-13718.6 lb.ft./degree) (S70 has 11.6 KNm/degree (8555.7 lb.ft./degree)).
A stiff body has a positive effect on active safety, sound levels, crash safety (above all side on collisions) and more. This also contributes to the P23 being approved for high trailer weights.
The front door members are also important as part of the reinforcement in the passenger compartment. The members are made of boron steel.
The tailgate and hood are made of aluminum.
The underbody treatment is carried out using "class 5" material which has less environmental effect.
All exterior panels except the roof are galvanized and those components are made of aluminum (Hood and tailgate).
Scheme 9
The climate control system in the Volvo P23 is modified compared to the S/V 70. The greatest change is the integration with the new network based electrical system. The network module Climate control module (CCM) controls all climate functions.
The climate control is as previously available in 3 versions
- ECC , (Electronic Climate Control) which is a fully automatic climate control system with air conditioning and that also allows manual settings.
- MCC , (Manual Climate Control) which is a manual climate control system with air conditioning.
- STD , (Standard heater), is a manual climate control, without air conditioning.
Increased diagnostic functions accessible via the data link connector (DLC) with VIDA. Reading/erasing the diagnostic trouble codes (DTCs), reading off/changing customer parameters and reading off the in and output signals.
The module is aligned by programming via the data link connector (DLC) with VIDA.
The on-board diagnostic (OBD) system for the SRS continually diagnoses the function of SRS system component and stores any diagnostic trouble codes (DTCs).
