P174C
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
Engine Torque Intervention Not Possible
P174C
2010 Porsche Cayman S (987) F6-3.4L Page 213
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
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
P174C
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
P174C
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 Engine RPM Control Intervention
P174C
Diagnosis information - PDK
2010 Porsche Cayman S (987) F6-3.4L Page 214
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
Software Monitoring, Implausible Calculation Of Positive Engine Torque Intervention
P174C
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
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, Calculation Of E-Shift Position Implausible
P174C
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
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
Software Monitoring, Reset Was Triggered By Application Software Monitoring A
P174C
Diagnosis information - PDK
2010 Porsche Cayman S (987) F6-3.4L Page 215
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
P174C
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
P174C
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
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
P174C
Diagnosis information - PDK
Software monitoring B of signal processing unit
2010 Porsche Cayman S (987) F6-3.4L Page 216
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
P174C
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
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
Engine Torque Intervention Not Possible
P174C
2010 Porsche Cayman S (987) F6-3.4L Page 213
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
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
P174C
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
P174C
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 Engine RPM Control Intervention
P174C
Diagnosis information - PDK
2010 Porsche Cayman S (987) F6-3.4L Page 214
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
Software Monitoring, Implausible Calculation Of Positive Engine Torque Intervention
P174C
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
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, Calculation Of E-Shift Position Implausible
P174C
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
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
Software Monitoring, Reset Was Triggered By Application Software Monitoring A
P174C
Diagnosis information - PDK
2010 Porsche Cayman S (987) F6-3.4L Page 215
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
P174C
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
P174C
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
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
P174C
Diagnosis information - PDK
Software monitoring B of signal processing unit
2010 Porsche Cayman S (987) F6-3.4L Page 216
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
P174C
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