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8004 PCM2 - gateway: Diagnosis/troubleshooting

DIAGNOSIS/TROUBLESHOOTING - 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 Boxster (986) in the Vehicle type menu and confirm with the ">>" key.
  • Select PCM in the control modules selection and confirm with the ">>" key.
  • Select PCM2 GW in the PCM2 function selection and confirm with the ">>" key.
  • Select Fault memory in the PCM2 GW function selection and confirm with the ">>" key.
  • Read out fault memory.
  • Erase fault memory.
  • Remove ignition key and switch on ignition again.
  • Read 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 C on the PCM2.
  • Pull off plug on instrument cluster.
  • Pull off plug on Climatronic.
  • Measure resistance on plug C 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 C 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 C 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 C of PCM2 between pin 1 and ground.
  • Switch on ignition.
 < 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 C of PCM2 between pin 2 and ground.
  • Switch on ignition.
 < 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
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