With P1715
P174B
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
- Internal bus error
Fault effects
- All pressure regulators, solenoid valves and shift-lock switch off
- Start enable only in position P
- No emergency program diagnosis
- Emergency hold function
- Transmission limp-home indication in instrument cluster control unit
With P1804
P174B
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
- Internal bus error
Fault effects
- All pressure regulators, solenoid valves and shift-lock switch off
- Start enable only in position P
- Emergency hold function
- Transmission limp-home indication in instrument cluster control unit
Double Fault: Two Faults Demand Alternative Measures With Equal Priority Rating
P174B
Diagnosis information - PDK
Double fault: two faults demand alternative measures with equal priority rating
Diagnostic conditions
2010 Porsche Cayman S (987) F6-3.4L Page 210
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
- Analyse fault cause for faults also entered
Fault setting conditions
- Inadmissible combination of alternative measures
Fault effects
- Emergency hold function
- Transmission limp-home indication in instrument cluster control unit
With P0604
P174B
Diagnosis information - PDK
PDK control unit, internal fault
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
- Control unit faulty
Fault setting conditions
- Internal diagnostic routine returns fault
Fault effects
- Power supply switch-off for pressure regulator
- Solenoid valve power supply switch-off
- Hydraulic control is switched off
- Start enable only in position P
- Limp-home message in instrument cluster
With P0605
P174B
Diagnosis information - PDK
PDK control unit, internal fault
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
- Control unit faulty
Fault setting conditions
- Internal diagnostic routine returns fault
Fault effects
- Power supply switch-off for pressure regulator
- Solenoid valve power supply switch-off
- Hydraulic control is switched off
- Start enable only in position P
- Limp-home message in instrument cluster
With P0603
P174B
Diagnosis information - PDK
2010 Porsche Cayman S (987) F6-3.4L Page 211
PDK control unit, internal fault
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
- Control unit faulty
- Software faulty
Fault setting conditions
- Internal diagnostic routine returns fault
Fault effects
- Power supply switch-off for pressure regulator
- Solenoid valve power supply switch-off
- Hydraulic control is switched off
- Start enable only in position P
- Limp-home message in instrument cluster
Transmission Ratio Monitoring
P174B
Diagnosis information - PDK
Transmission ratio 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
- Speed sensors faulty
- Lines faulty
Fault setting conditions
- Rotational speed comparison of input shaft and output shaft supplies fault
Fault effects
- Limp-home message in instrument cluster
Input Shaft Overspeed
P174B
Diagnosis information - PDK
Input shaft overspeed
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
- Speed sensors faulty
- Lines faulty
Fault setting conditions
- Rotational speed of shaft 1 or shaft 2 below threshold value
- Rotational speed of shaft 1 or shaft 2 above threshold value
Fault effects
- No power transmission
- Limp-home message in instrument cluster
Brake Light Switch, Implausible Information
2010 Porsche Cayman S (987) F6-3.4L Page 212
P174B
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
- 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
Setpoint Definitions
P174B
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
Positive Engine Torque Intervention Not Possible
P174B
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
- Internal bus error
Fault effects
- All pressure regulators, solenoid valves and shift-lock switch off
- Start enable only in position P
- No emergency program diagnosis
- Emergency hold function
- Transmission limp-home indication in instrument cluster control unit
With P1804
P174B
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
- Internal bus error
Fault effects
- All pressure regulators, solenoid valves and shift-lock switch off
- Start enable only in position P
- Emergency hold function
- Transmission limp-home indication in instrument cluster control unit
Double Fault: Two Faults Demand Alternative Measures With Equal Priority Rating
P174B
Diagnosis information - PDK
Double fault: two faults demand alternative measures with equal priority rating
Diagnostic conditions
2010 Porsche Cayman S (987) F6-3.4L Page 210
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
- Analyse fault cause for faults also entered
Fault setting conditions
- Inadmissible combination of alternative measures
Fault effects
- Emergency hold function
- Transmission limp-home indication in instrument cluster control unit
With P0604
P174B
Diagnosis information - PDK
PDK control unit, internal fault
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
- Control unit faulty
Fault setting conditions
- Internal diagnostic routine returns fault
Fault effects
- Power supply switch-off for pressure regulator
- Solenoid valve power supply switch-off
- Hydraulic control is switched off
- Start enable only in position P
- Limp-home message in instrument cluster
With P0605
P174B
Diagnosis information - PDK
PDK control unit, internal fault
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
- Control unit faulty
Fault setting conditions
- Internal diagnostic routine returns fault
Fault effects
- Power supply switch-off for pressure regulator
- Solenoid valve power supply switch-off
- Hydraulic control is switched off
- Start enable only in position P
- Limp-home message in instrument cluster
With P0603
P174B
Diagnosis information - PDK
2010 Porsche Cayman S (987) F6-3.4L Page 211
PDK control unit, internal fault
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
- Control unit faulty
- Software faulty
Fault setting conditions
- Internal diagnostic routine returns fault
Fault effects
- Power supply switch-off for pressure regulator
- Solenoid valve power supply switch-off
- Hydraulic control is switched off
- Start enable only in position P
- Limp-home message in instrument cluster
Transmission Ratio Monitoring
P174B
Diagnosis information - PDK
Transmission ratio 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
- Speed sensors faulty
- Lines faulty
Fault setting conditions
- Rotational speed comparison of input shaft and output shaft supplies fault
Fault effects
- Limp-home message in instrument cluster
Input Shaft Overspeed
P174B
Diagnosis information - PDK
Input shaft overspeed
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
- Speed sensors faulty
- Lines faulty
Fault setting conditions
- Rotational speed of shaft 1 or shaft 2 below threshold value
- Rotational speed of shaft 1 or shaft 2 above threshold value
Fault effects
- No power transmission
- Limp-home message in instrument cluster
Brake Light Switch, Implausible Information
2010 Porsche Cayman S (987) F6-3.4L Page 212
P174B
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
- 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
Setpoint Definitions
P174B
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
Positive Engine Torque Intervention Not Possible