8004 PCM2 - gateway: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING CHART (8004 PCM2 - GATEWAY)

Work instruction			Display OK	If not OK
1	Read out PCM2 fault memory	Connect the Porsche System Tester II 9588 to the diagnostic socket, start it and switch on the ignition Select 911 Turbo (996) in the Vehicle type menu and confirm with the ">>" key Select PCM in the control modules selection and confirm with the ">>" key Select PCM2/CDR23 in the control modules selection and confirm with the ">>" key Select PCM2 GW in the PCM2 function selection and confirm with the ">>" key Start Fault memory in the menu using the ">>" key Reading out fault memory Erase fault memory Remove ignition key and switch on ignition again Reading out fault memory Extract ambient data, press the ">>" key	-> End	Fault code is displayed Step 2
2	Check CAN bus leads, CAN-high and CAN-low for short circuit	Switch off ignition Pull off plug E on the PCM2 Pull off plug on instrument cluster Pull off plug on Climatronic Measure resistance on plug E of PCM2 between pins 1 and 2	Step 3	Repair short circuit in wiring harness between high and low -> End
3	Check CAN comfort (high) for short circuit to ground	Measure resistance on plug E of PCM2 between pin 1 and ground	Step 4	Repair short circuit between CAN comfort (high) and ground -> End
4	Check CAN comfort (low) for short circuit to ground	Measure resistance on plug E of PCM2 between pin 2 and ground	Step 5	Repair short circuit between CAN comfort (low) and ground -> End
5	Check short circuit between CAN Comfort (high) and battery positive connection	Measure voltage on plug E of PCM2 between pin 1 and ground Switch ignition on	< 0 V Step 6	Repair short circuit between CAN comfort (high) and voltage supply line -> End
6	Check for short circuit between CAN comfort (low) and battery positive connection	Measure voltage on plug E of PCM2 between pin 2 and ground Switch ignition on	< 0 V Step 7	Repair short circuit between CAN comfort (low) and voltage supply line -> End
7	Determine faulty control unit	Switch off ignition Reconnect all plugs to control units Pull off plugs to the control modules (except PCM2) individually and read out the fault memory of the PCM2 and check whether the fault has been remedied	The fault is remedied by disconnecting the plug connection of a control module Step 8	Step 9
8	Replace the control module which was last disconnected from the CAN bus		-> End	-
9	Replace PCM2		-> End