P18A0
Diagnosis information - PDK
Software monitoring, calculation of E-shift position implausible
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
2010 Porsche Cayman S (987) F6-3.4L Page 158
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Racing start status without driver request
- Power transmission without driver request
- No shift in spite of driver request
- Displayed position not same as engaged position
Fault effects
- Emergency hold function
- Transmission limp-home indication in instrument cluster control unit
Positive Engine Torque Intervention Not Possible
P18A0
Diagnosis information - PDK
Positive engine torque intervention not possible
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- Fault in CAN bus
- DME control unit detects engine fault
Fault setting conditions
- Torque intervention not possible
Fault effects
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring, Implausible Calculation Of Engine Rpm Control Intervention
P18A0
Diagnosis information - PDK
Software monitoring, implausible calculation of engine rpm control intervention
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Fault in calculation path for engine speed control
Fault effects
- Transmission limp-home indication in instrument cluster control unit
- Message counter stopped
Engine Torque Intervention Not Possible
P18A0
Diagnosis information - PDK
Engine torque intervention not possible
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
2010 Porsche Cayman S (987) F6-3.4L Page 159
then tested and any faults are stored.
- Ignition on
Possible fault causes
- Fault in CAN bus
Fault setting conditions
- Torque intervention not possible
Fault effects
- Transmission limp-home indication in instrument cluster control unit
SPI Error
P18A0
Diagnosis information - PDK
SPI error
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- EEPROM content implausible at system start
Fault effects
- Emergency hold function
- Transmission limp-home indication
Software Monitoring, Reset Was Triggered By Operating System Monitoring A
P18A0
Diagnosis information - PDK
Software monitoring, reset was triggered by operating system monitoring A
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Internal software monitoring reports fault
- Undervoltage
Fault effects
- No power transmission for reference speed < 5 km/h (3 mph) and valid transmission range
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring, Implausible Calculation Of Positive Engine Torque Intervention
P18A0
Diagnosis information - PDK
Software monitoring, implausible calculation of positive engine torque intervention
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
2010 Porsche Cayman S (987) F6-3.4L Page 160
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Fault in calculation path for positive engine intervention
Fault effects
- Transmission limp-home indication in instrument cluster control unit
- Message counter stopped
Software Monitoring, Reset Was Triggered By Application Software Monitoring A
P18A0
Diagnosis information - PDK
Software monitoring, reset was triggered by application software monitoring A
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Internal software monitoring reports fault
Fault effects
- No power transmission for reference speed < 5 km/h (3 mph) and valid transmission range
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring: Reset Was Triggered By Application Software Monitoring
P18A0
Diagnosis information - PDK
Software monitoring: reset was triggered by application software monitoring
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Internal software monitoring reports fault
Fault effects
- No power transmission at speeds < 5 km/h (3 mph)
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring A Of Signal Processing Unit
P18A0
Diagnosis information - PDK
Software monitoring A of signal processing unit
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
2010 Porsche Cayman S (987) F6-3.4L Page 161
Fault setting conditions
- Complement error
Fault effects
- CAN alive counter freeze
- Engine speed limitation
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring B Of Signal Processing Unit
P18A0
Diagnosis information - PDK
Software monitoring B of signal processing unit
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Complement error
Fault effects
- CAN alive counter freeze
- Engine speed limitation
- Transmission limp-home indication in instrument cluster control unit
Setpoint Definitions
P18A0
Setpoint definitions
NOTE: The specified values and value ranges correspond to the OK state in each case.
Line test setpoints
Short circuit to B+:
- Setpoint voltage - 0.5 V --> + 0.5 V
Short circuit to ground:
- Setpoint resistance > 0.9 MOhm
Open circuit:
- Setpoint resistance < 2 Ohm
Control unit setpoints
- Supply voltage terminal 30 9.1 V --> 16.4 V
- Voltage, terminal 15 9.5 V --> 16.0 V
Brake Light Switch, Implausible Information
P18A5
Diagnosis information - PDK
Brake light switch, implausible information
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
- No CAN bus fault
Possible fault causes
- Brake light switch faulty
- Brake light test switch faulty
2010 Porsche Cayman S (987) F6-3.4L Page 162
- CAN bus faulty
- Fault in PSM control unit
Fault setting conditions
- Brake light switch and brake light test switch supply different information
Fault effects
- Transmission limp-home indication in instrument cluster
Double Fault: Two Faults Demand Alternative Measures With Equal Priority Rating
P18A5
Diagnosis information - PDK
Software monitoring, calculation of E-shift position implausible
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
2010 Porsche Cayman S (987) F6-3.4L Page 158
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Racing start status without driver request
- Power transmission without driver request
- No shift in spite of driver request
- Displayed position not same as engaged position
Fault effects
- Emergency hold function
- Transmission limp-home indication in instrument cluster control unit
Positive Engine Torque Intervention Not Possible
P18A0
Diagnosis information - PDK
Positive engine torque intervention not possible
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- Fault in CAN bus
- DME control unit detects engine fault
Fault setting conditions
- Torque intervention not possible
Fault effects
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring, Implausible Calculation Of Engine Rpm Control Intervention
P18A0
Diagnosis information - PDK
Software monitoring, implausible calculation of engine rpm control intervention
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Fault in calculation path for engine speed control
Fault effects
- Transmission limp-home indication in instrument cluster control unit
- Message counter stopped
Engine Torque Intervention Not Possible
P18A0
Diagnosis information - PDK
Engine torque intervention not possible
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
2010 Porsche Cayman S (987) F6-3.4L Page 159
then tested and any faults are stored.
- Ignition on
Possible fault causes
- Fault in CAN bus
Fault setting conditions
- Torque intervention not possible
Fault effects
- Transmission limp-home indication in instrument cluster control unit
SPI Error
P18A0
Diagnosis information - PDK
SPI error
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- EEPROM content implausible at system start
Fault effects
- Emergency hold function
- Transmission limp-home indication
Software Monitoring, Reset Was Triggered By Operating System Monitoring A
P18A0
Diagnosis information - PDK
Software monitoring, reset was triggered by operating system monitoring A
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Internal software monitoring reports fault
- Undervoltage
Fault effects
- No power transmission for reference speed < 5 km/h (3 mph) and valid transmission range
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring, Implausible Calculation Of Positive Engine Torque Intervention
P18A0
Diagnosis information - PDK
Software monitoring, implausible calculation of positive engine torque intervention
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
2010 Porsche Cayman S (987) F6-3.4L Page 160
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Fault in calculation path for positive engine intervention
Fault effects
- Transmission limp-home indication in instrument cluster control unit
- Message counter stopped
Software Monitoring, Reset Was Triggered By Application Software Monitoring A
P18A0
Diagnosis information - PDK
Software monitoring, reset was triggered by application software monitoring A
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Internal software monitoring reports fault
Fault effects
- No power transmission for reference speed < 5 km/h (3 mph) and valid transmission range
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring: Reset Was Triggered By Application Software Monitoring
P18A0
Diagnosis information - PDK
Software monitoring: reset was triggered by application software monitoring
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Internal software monitoring reports fault
Fault effects
- No power transmission at speeds < 5 km/h (3 mph)
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring A Of Signal Processing Unit
P18A0
Diagnosis information - PDK
Software monitoring A of signal processing unit
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
2010 Porsche Cayman S (987) F6-3.4L Page 161
Fault setting conditions
- Complement error
Fault effects
- CAN alive counter freeze
- Engine speed limitation
- Transmission limp-home indication in instrument cluster control unit
Software Monitoring B Of Signal Processing Unit
P18A0
Diagnosis information - PDK
Software monitoring B of signal processing unit
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
Possible fault causes
- PDK control unit faulty
Fault setting conditions
- Complement error
Fault effects
- CAN alive counter freeze
- Engine speed limitation
- Transmission limp-home indication in instrument cluster control unit
Setpoint Definitions
P18A0
Setpoint definitions
NOTE: The specified values and value ranges correspond to the OK state in each case.
Line test setpoints
Short circuit to B+:
- Setpoint voltage - 0.5 V --> + 0.5 V
Short circuit to ground:
- Setpoint resistance > 0.9 MOhm
Open circuit:
- Setpoint resistance < 2 Ohm
Control unit setpoints
- Supply voltage terminal 30 9.1 V --> 16.4 V
- Voltage, terminal 15 9.5 V --> 16.0 V
Brake Light Switch, Implausible Information
P18A5
Diagnosis information - PDK
Brake light switch, implausible information
Diagnostic conditions
The control unit initially tests internal function sequences when the ignition is switched on (terminal 15). If they are OK, all diagnosable outputs are
then tested and any faults are stored.
- Ignition on
- No CAN bus fault
Possible fault causes
- Brake light switch faulty
- Brake light test switch faulty
2010 Porsche Cayman S (987) F6-3.4L Page 162
- CAN bus faulty
- Fault in PSM control unit
Fault setting conditions
- Brake light switch and brake light test switch supply different information
Fault effects
- Transmission limp-home indication in instrument cluster
Double Fault: Two Faults Demand Alternative Measures With Equal Priority Rating
P18A5