Quote:
Originally Posted by cleavster
I checked the cap, the wires, and the plugs are all in good condition. Using a code reader, I was able to determine that the MAS controller to pull the following codes:
Code 3 - TN/TD signal (RPM) interrupted
Code 5 - Output for air injection pump control defective
Code 13 - Excessive A/C compressor clutch slippage
Code 3 - i am not sure what this code refers to and it is probably attributed to the hesitation that I am currently experiencing when the car is at operating temp.
Code 5 - bad air/vacuum pump? Can anyone confirm for sure before i purchase a new one?
Code 13 - well, probably a bad compressor? I have no AC for a long time.
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Code 3 - TN/TD signal is picked up by a rear crank sensor to the EZL and then the EZL sends it to the CIS ecu and the MAS relay. You can check for missing ignition signals with an oscilloscope. This stuff rarely fails.
Code 5 - maybe the clutch is disconnected/shorted out or a switchover valve for the checkvalve is disconnected/bad. I believe that the purpose of this exhaust air pump is to only run when the car is warming up. If it's turning when the car is warmed up it could create the problem you're experiencing
Code 13 - Clutch problem? These compressors have an rpm sensor in the back that's for emergencies when your compressor seizes up MAS relay will disconnect the clutch so that you don't throw your belt.
anyway the exhaust air pump, ac clutch are all controlled by the MAS relay. The fact that all these problems are kind of connected to the MAS relay could point to that relay.
Check your battery voltage when running
I still recommend replacing the ignition coil and checking the coil wire (No resistance for the coil wire).
Getting the CIS-E car with EGR and Air injection through the notorious CA smog every year must be a challenge. Glad I don't have emissions where I live. Good luck.
check out page 44 of this pdf:
https://www.startekinfo.com/StarTek/outside/11832/Resources/201Create/PDF/01002.pdf
Using this diagram you can check connections/Resistances