AEM CAS Trigger Disc 308761 User Manual

							  
© 2010 ADVANCED ENGINE MANAGEMENT INC. 
2205 126th Street Unit A    Hawthorne, CA. 90250 
Phone: (310) 484-2322 Fax: (310) 484-0152 
http://www.aempower.com 
Instruction Part Number: 10-6620-A supplement 
 
Page 1 of 25 
Installation Instructions for: 
Crank Angle Sensor replacement for EMS P/N 30-6620 
1990-1995 Nissan 300ZX VG30DE, VG30DETT 
1989-1998 Nissan Skyline RB26DETT,  
1993-1998 Skyline RB25DET,  
1989-1994 Skyline RB20DET,  
1988-1990 S13 180SX, 200SX and Silvia CA18DET 
 
WARNING: 
,! 
This installation is not for the tuning novice nor the PC illiterate! 
Use this system with EXTREME
 caution! The AEM EMS System 
allows for total flexibility in engine tuning. Misuse of this 
product can destroy your engine! If you are not well versed in 
engine dynamics and the tuning of management systems or are 
not PC literate, please do not attempt the installation. Refer the 
installation to a AEM trained tuning shop or call 800-423-0046 
for technical assistance. You should also visit the AEM EMS 
Tech Forum at http://www.aempower.com 
 
NOTE: AEM holds no responsibility for any engine damage that 
results from the misuse of this product!
 
 
This product is legal in California for racing vehicles only and should never 
be used on public highways. 
 
 
 
 
 
 
 
 
 
 
 
 
  
						

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**Cam / Crank Angle Sensor: AEM trigger disc MUST be used   
Discrepancies have been observed in the OEM cam/crank signals between model years 
and/or trim levels; to avoid confusion the Series 2 EMS does not support the OEM Nissan 
trigger pattern. A replacement trigger disc is now included with every Nissan EMS and 
must be installed before attempting to start the engine. The following installation was 
performed on a stock 300ZX. Installation in a Skyline or modified 300ZX may require 
removal of different components to access the CAS sensor, but the procedure for the CAS 
disc change should be identical. 
 
Tools/parts required: 
•  Replacement trigger disc for Nissan RB/VG/VE cam angle sensor  
(AEM P/N 35-8761, supplied with 30-6620 EMS) 
• ¼” ratchet 
• 4-6” extension 
• 8mm socket 
•  10 mm socket 
• Sharpie 
• Pick 
•  Small needle-nose pliers 
•  ¼ ”  flat screwdriver 
•  No. 1 Phillips screwdriver 
•  No. 2 Phillips screwdriver 
•  Small mallet or dead blow hammer 
• Medium-sized hammer 
•  Small prybar (or wide flat screwdriver) 
•  3 M4x45mm cap screws (available at McMaster-Carr in pack of 25 for $1.47; p/n: 
91280A149) 
• Medium-sized pliers 
•  3/8” pin punch 
•  1/8” pin punch 
•  Vise or area to place sensor assembly on 
• Red threadlocker 
 
 
WARNING:
 
Failure to perform the following procedure correctly could result in permanent damage to 
mechanical and electrical sensor components, which could result in engine damage. 
Please read all instructions carefully before attempting this procedure, and do not attempt 
the install if you feel you may not be able to perform all operations safely without 
damaging components. AEM will not be held liable for any damage that occurs as a result 
of these instructions. 
 
 
 
 
 
 
 
 
  
						

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Instructions: 
Locate the CAS sensor on your vehicle as shown in figures 1, 2, and 3. 
 
 
Figure 1: Location of the CAS sensor 
 
 
Figure 2: Location of the CAS sensor 
  
						

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Figure 3: Close-up of CAS sensor 
 
Remove intake tube obstructing access to the CAS sensor using an 8mm socket as shown 
in figures 4 and 5. Figure 6 shows how access to the CAS sensor looks once the tube is 
removed. 
 
Figure 4: Removal of intake tube using 8mm socket 
  
						

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Figure 5: Removal of intake tube using 8mm socket 
 
 
Figure 6: Intake tube removed to access CAS sensor 
 
 
  
						

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Mark the three bolts on the CAS sensor with your Sharpie as shown in figures 7 and 
8 so that the sensor will go back into its original position upon reinstallation. 
 
  
Figure 7: Marking position of CAS sensor 
 
 
Figure 8: Marking position of CAS sensor 
  
						

							Page 7 of 25 
 
Remove clip that holds the harness to the CAS sensor using a pick and a pair of 
needle-nose pliers as shown in figures 9 and 10. This may be done after removing 
the CAS assembly, but is best done now. 
  
Figure 9: Pry here to remove this clip 
 
 
Figure 10: Remove clip with needle-nose pliers 
 
 
  
						

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Remove the three bolts on the CAS sensor using a 10mm socket as shown in figure 11. 
Take care not to turn the sensor. Mark with your Sharpie so that the sensor can be 
reinstalled correctly as shown in figure 12. Figure 13 shows the cam with the CAS 
assembly removed. (If you turn the sensor by accident, make sure to align it with cam and 
mark it) 
  
Figure 11: Removal of 3 CAS sensor bolts using 10mm socket 
 
  
Figure 12: Mark shaft relative to housing for correct reinstallation onto cam  
						

							Page 9 of 25 
 
 
  
Figure 13: CAS sensor removed 
 
Remove the three screws holding the CAS assembly together using a ¼” flat 
screwdriver (use the flat screwdriver since these screws are tightly installed, but soft) 
as shown in figure 14. 
 
Figure 14: Taking apart CAS assembly using number 2 Phillips screwdriver 
 
  
						

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Remove screws holding the seal cover onto the assembly using a ¼” flat screwdriver 
as shown in figure 15. 
  
Figure 15: Removing seal cover on CAS assembly using ¼” screwdriver 
 
Screw in the M4x45mm cap screws so that plenty of threads are engaged and lightly 
tap the three bolts evenly using a mallet so that the assembly will separate as shown 
in figure 16. If prying between the two halves is necessary as shown in figure 17, be 
extremely careful not to damage the sensor inside or the rubber seal. 
  
Figure 16: Using cap screws and mallet to loosen/remove cover