Roll-Over Protection System Diagnosis

Fault, Fault code -- Possible causes, elimination, notes


Test point 1
Warning light of roll-over protection
Open circuit
Short to ground

Fault code 1

This fault is stored in the memory if there is an open circuit or short to ground in the supply lead to the warning light in the instrument cluster.

Open circuit
1. Check bulb and replace if necessary.
2. Check wire to pin 12 for open circuit. Pull plug off the roll-over protection control module. Pull off plug III on the instrument cluster.
Measure resistance between plug on roll-over protection control module pin 12 and plug III on instrument cluster pin 16
Ohmmeter display: less than 5.0 Ohms

Short to ground
Measure resistance between plug on roll-over protection control module pin 12 and ground
Ohmmeter display: infinite Ohms


Test point 2
Warning light of roll-over protection
Short to B+

Fault code 2

This fault is stored in the memory if there is a short to B+ of the supply lead to the warning light in the instrument cluster.

1. Pull off plug on control module and plug III on instrument cluster.
Check wire to pin 12 for short to B+.
Switch ignition on. Measure voltage between plug on roll-over protection control module pin 12 and ground
Voltmeter display: 0.0 Volts


Test point 3
Supply voltage

Fault code 3

This fault is stored in the memory if the supply voltage is insufficient.

1. Examine battery and alternator.
2. Inspect the plug connection on the control module for corrosion.


Test point 4
Solenoid valves 1 and 2
Leakage resistance/short circuit

Fault code 4

This fault is stored in the memory if the supply leads of solenoid valves 1 and 2 have a mutual short circuit or leakage resistance.

Pull off plugs on control module and on solenoid valves 1 and 2. Check lines to solenoid valves 1 and 2 for shorts to each other.


Test point 5
Solenoid valve 1
Short to ground

Fault code 5

This fault is stored in the memory in the event of a short to ground in the supply lead of solenoid valve 1.

Pull off plug on solenoid valve 1 and plug on control module.

3. Measure resistance between plug on control module pin 4 and ground
Display: infinite Ohms

Measure resistance between the plug on the control module pin 4 and the plug on solenoid valve 1 pin 2
Display: less than 5.0 Ohms


Test point 6
Solenoid valve 1
Open circuit

Fault code 6

This fault is stored in the memory if there is an open circuit in the supply leads to solenoid valve 1.

Pull off plug on control module and on solenoid valve 1
Measure resistance between plug on control module pin 4 and plug on solenoid valve 1 pin 2
Display: less than 5.0 Ohms

Measure resistance between the plug on the control module pin 5 and the plug on solenoid valve 1 pin 1
Display: less than 5.0 Ohms

Push plug onto solenoid valve 2 again. Unplug connector X10 from the subframe. Measure resistance between pins 1 and 2
Ohmmeter display: 4.0 to 6.0 Ohms at 20 degrees C.


Test point 7
Solenoid valve 1
Short to B+

Fault code 7

This fault is stored in the memory in the event of a short to B+ in the supply lead of solenoid valve 1 (triggers roll-over bar).

1. Pull of plugs on control module and on solenoid valves 1 and switch on the ignition.
Measure voltage between plug on control module pin 4 and ground
Voltmeter display: 0.0 Volts


Test point 8
Solenoid valve 2
Short to ground

Fault code 9

This fault is stored in the event of a short to ground in the lead of solenoid valve 2.

Pull off plug on control module and on solenoid 2.

Measure resistance between plug on control module pin 17 and ground
Ohmmeter display: infinite Ohms

Push plug onto solenoid valve 2 again. Unplug connector X10 from subframe.
Measure the resistance between pins 3 and 4
Ohmmeter display: 4 to 6 Ohms at 20 degrees C


Test point 9
Solenoid valve 1
Open circuit

Fault code 10

This fault is stored in the memory if there is an open circuit in the supply lead to solenoid valve 2.

1. Pull off plug on control module and on solenoid valve 2
Measure resistance between plug on control module pin 17 and plug on solenoid valve 2 pin 2
Ohmmeter display: less than 5.0 Ohms

2. Measure resistance between plug on control module pin 21 and the plug on solenoid valve 2 pin 1
Ohmmeter display: less than 5.0 Ohms

Push plug onto solenoid valve 2 again. Unplug connector X10 from subframe.
Measure the resistance between pins 3 and 4
Ohmmeter display: 4 to 6 Ohms at 20 degrees C


Test point 10
Solenoid valve 2
Short to B+

Fault code 11

This fault is stored in the memory in the event of a short to B+ in the supply lead of solenoid valve 2 (triggers roll-over bar).

1. Pull off plugs on control module and on solenoid valve 1 and switch on the ignition.
Measure voltage between plug on control module pin 17 and ground
Voltmeter display: 0.0 Volts


Test point 11
Trigger counter

Fault code 13

This fault is stored in the memory when the roll-over bar has been triggered more than 200 times. The fault can initially be erased using the Porsche System Tester 2, but reappears as soon as the ignition is switched off and on again.

Replace roll-over bars.

Replace control module.


Test point 12
Spirit level 1

Fault code 20, 21, 22, 23

This fault is stored in the memory if a defect is detected in level sensor 1.

Replace control unit.


Test point 13
Spirit level 2

Fault code 24, 25, 26, 27

This fault is stored in the memory if a defect is detected in level sensor 2.
Replace control unit.


Test point 14
Acceleration sensor

Fault code 28

This fault is stored in the memory if a defect is detected in the acceleration sensor.

Replace control module.


Test point 15
Solenoid valve 1, actuation

Fault code 100

This fault is stored in the memory in the event of a short circuit
in the supply lead of solenoid valve 1 during triggering.

1. Check supply lead of solenoid valve for short circuit.

2. After eliminating the fault, replace control module.

NOTE
This fault cannot be erased with the Porsche System Tester 2.


Test point 16
Solenoid valve 2, actuation

Fault code 101

This fault is stored in the memory in the event of a short circuit
in the supply lead of solenoid valve 2 during triggering.

1. Check supply lead of solenoid valve for short circuit.

2. After eliminating the fault, replace control module.

NOTE
This fault cannot be erased with the Porsche System Tester 2


Test point 17
Control module faulty

Fault codes 129, 195, 196, 200-204, 209-213, 219-229, 230-235

These faults are stored in the memory if a defect is detected in the control module.

Replace control module.


Identification
The diagnosis software number and control module part number can be read out under the "Identification" menu item.

Fault memory
Stored faults can be read out under the "Fault memory" menu item. If a fault is displayed in the Porsche System Tester 2, more detailed information about the fault can be obtained with the F8 key as of software version 3.0.

Erase fault memory
Faults stored in the control module can be erased under the "Erase fault memory" menu item. Here, all stored faults are erased.

Actual values
In the "Actual values" menu item, the current values of the following parameters can be read out.
- Operating time
- Number of times bars were triggered

Input signals
In the "Input signals" menu item, the current status of the acceleration sensor (active or not active) can be read out.

Drive links
In the "Drive links" menu item, the roll-over bars can be extended.

Events
The number of events as well as the values of the individual sensors which triggered the system can be read out under the menu item "Events". When the roll-over bars have been triggered 200 times, fault code 13, "Trigger counter", is stored in the control module.

Transport lock
The transport lock can be activated or deactivated under the "Transport lock" menu item. If the transport lock is activated, the system cannot be triggered and the warning light in the instrument cluster lights up continuously. The transport lock is activated if the vehicle is transported or e.g. loaded or unloaded onto a truck, in order to prevent the system from being triggered.

Extract coding
Information retrieval for the following statuses can take place under the "Extract coding" menu item.
- Status of transport lock
- Vehicle type
- Locked by

Lock
In the "Lock" menu item, a new control module can be activated. If the control module is replaced, it must be locked to enable it to function.