DME Control Unit: Performing "Secondary-Air System" Short Test Using The PIWIS Tester (GROUP 0, NO. 22/09)

DME CONTROL UNIT: PERFORMING "SECONDARY-AIR SYSTEM" SHORT TEST USING THE PIWIS TESTER

TECHNICAL SERVICE BULLETIN

VEHICLE TYPE

Boxster (987)/Boxster S (987) 

Cayman (987)/Cayman S (987) 

911 Carrera (997) / 911 Carrera S (997) 

MODEL YEARS

2005 to 2008 (1st Generation)

CONCERN

DME Control Unit 

INFORMATION

Performing DME short tests using the PIWIS Tester.

WORK PROCEDURE

The information below describes the procedure for carrying out short tests using the PIWIS Tester 9718.

Starting point: 

• Handbrake on.
• Manual transmission: Gearshift lever in neutral.
• Tiptronic: Selector lever in position "P".
• PIWIS Tester connected to the vehicle.
• After Control unit search > DME control unit selected.
• Engine running.

Follow the instructions on the PIWIS Tester. 

1. Start short test with "Knock control". 
2. Then continue the tests up to "O2 Sensor Circuit Slow Response". 
3. Switch on all loads to max. setting: 
   • Air conditioning,
   • Fan,
   • Lights on,
   • Rear window defroster,
   • Heated seats.
     Fig 1: Screen Display - Secondary-Air System Short Test Procedure (1 of 10)

     
4. Start the "Oxygen sensor plausibility" test.
   Fig 2: Screen Display - Secondary-Air System Short Test Procedure (2 of 10)

   
5. Continue pressing the accelerator and brake pedals while the short test is running. The engine speed will be about 1,480 rpm.
   Fig 3: Screen Display - Secondary-Air System Short Test Procedure (3 of 10)

   
6. Once the short test has been carried out successfully, the engine speed will increase. Continue pressing the accelerator and brake pedals. The engine speed will increase to 2,240 rpm. Maintain this for approx. 5 seconds. 
7. Switch off  the ...
   • Air conditioning.
   • Rear window defroster.
   • Heated seats.

   Set the Fan to its lowest setting. 

   Fig 4: Screen Display - Secondary-Air System Short Test Procedure (4 of 10)

   
8. Start "Basic mixture adaption".
   Fig 5: Screen Display - Secondary-Air System Short Test Procedure (5 of 10)

   
   WARNING: Road test on public roads - Danger to other road users.
   • Get another person to operate the PIWIS Tester during the road test if necessary.
   • Perform road test on a road with no traffic.
9. Drive the vehicle while "Basic mixture adaption" is running.

   Information! 

   Avoid sharp turns. Select a straight stretch of road if possible.

   • Set the selector lever to "manual". 
   • Drive in second gear at about 2,500 - 3,000 rpm.  Maintain this speed for 30 seconds. 
   • Switch to the deceleration (overrun) phase, stay in second gear  for 5 seconds  and shift down to first gear. 
   • Continue on for about 5 seconds,  then let off the throttle to bring the engine rpm down to idle speed  and vehicle to a standstill. 
     Fig 6: Screen Display - Secondary-Air System Short Test Procedure (6 of 10)

     
10. Start the "Secondary-air system" short test.
    Fig 7: Screen Display - Secondary-Air System Short Test Procedure (7 of 10)

    
11. The "Secondary-air system" short test is running.
    Fig 8: Screen Display - Secondary-Air System Short Test Procedure (8 of 10)

    
12. The "Secondary-air system" short test was carried out successfully.
    Fig 9: Screen Display - Secondary-Air System Short Test Procedure (9 of 10)

    

    Once the short test has been carried out successfully, the short test will be blocked automatically because the diagnosis has been performed.

    If the "Secondary-air system (total)" flag is the only flag that is not checked, this means that the short test has finished and the diagnosis was performed. However, the cycle flag for "Oxygen sensor plausibility" was not set or the "Basic mixture adaption" was not performed correctly.

TOOLS

PIWIS Tester 9718