Required RPM range for CA smog test?
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Joined: Jan 2002
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From: Pasadena, CA
Required RPM range for CA smog test?
Hey folks, I was just curious if anyone knows what the official allowable RPM range for the CA smog test is? Currently they test my car in 2nd gear for 15 mph, 3rd gear for 25 mph. This gives me 1820 rpm and 1980 rpm, respectively.
Needless to say, I failed with about 700ppm HC's at 15mph, 200ppm HC's at 25mph. Converter and all emissions equipment is in place. I am currently troubleshooting.
Also, someone should fix my relief valve solenoid problem for me. Code 31, even with it plugged in.
Needless to say, I failed with about 700ppm HC's at 15mph, 200ppm HC's at 25mph. Converter and all emissions equipment is in place. I am currently troubleshooting.
Also, someone should fix my relief valve solenoid problem for me. Code 31, even with it plugged in.
HAILERS
Joined: May 2001
Posts: 20,563
Likes: 27
From: FORT WORTH, TEXAS,USA
The Relief solenoid valve is the one with the Blue connector on it.
It has two wires. One is black/white and should have batt pwr on it any time the key is ON.
The other wire goes to the ECU. That wire gets a ground put on it by the ECU to make it close/open.
What determines when the ECU puts a gnd on the Relief solenoid, is related to the TPS.
A properly set TPS will put a gnd on that solenoid when your idling the car. So with a fully hot engine, pull the connector off that solenoid and put it back on the solenoid. You should feel the solenoid click when you do that.
If it does not click, then check for batt voltage on the black/white wire. It'll most likely be there. Hard for it not to be there and have the engine running. Just the way things work.
As for the gnd from the ECU to the relief solenoid..............go to the ECU and check the input from the TPS to the ECU (narrow range sensor wire) to see what it reads at the ECU with the engine running. Should be one volt dc approx.
The ground from the ECU to the Relief solenoid should not be there all the time. It should only be there at given times in the running of the engine.
IF the input to the ECU from the narrow range TPS sensor is approx 1vdc.....and the relief solenoid isn't pulling in..........then pull the plug off the ECU and ohm out that green/red wire from the ECU plug to the TPS connector. Hard to believe it'd be open though. If it ohm out, the ECU is not doing its job putting a gnd on the relief solenoid when it's supposed to. ECU problem then.
The relief solenoid along with the switching solenoid control the ACV which in turn controls where the air from the airpump is routed at a given time. Lack of a working relief solenoid can cause problems when doing emissions testing.
REALLY hard to believe the wire b/t the ECU and relief solenoid is the problem. More likely a lack of the right signal from the narrow range TPS to the ECU causing the problem. OR the electrical connector is off the relief solenoid. Got me.
There's a factory service manual on this site that has trouble shooting methods for problems like yours. FUEL AND EMISSIONS section. There's also the wiring diagrams available showing the two wires b/t the ECU and the relief solenoid.
It has two wires. One is black/white and should have batt pwr on it any time the key is ON.
The other wire goes to the ECU. That wire gets a ground put on it by the ECU to make it close/open.
What determines when the ECU puts a gnd on the Relief solenoid, is related to the TPS.
A properly set TPS will put a gnd on that solenoid when your idling the car. So with a fully hot engine, pull the connector off that solenoid and put it back on the solenoid. You should feel the solenoid click when you do that.
If it does not click, then check for batt voltage on the black/white wire. It'll most likely be there. Hard for it not to be there and have the engine running. Just the way things work.
As for the gnd from the ECU to the relief solenoid..............go to the ECU and check the input from the TPS to the ECU (narrow range sensor wire) to see what it reads at the ECU with the engine running. Should be one volt dc approx.
The ground from the ECU to the Relief solenoid should not be there all the time. It should only be there at given times in the running of the engine.
IF the input to the ECU from the narrow range TPS sensor is approx 1vdc.....and the relief solenoid isn't pulling in..........then pull the plug off the ECU and ohm out that green/red wire from the ECU plug to the TPS connector. Hard to believe it'd be open though. If it ohm out, the ECU is not doing its job putting a gnd on the relief solenoid when it's supposed to. ECU problem then.
The relief solenoid along with the switching solenoid control the ACV which in turn controls where the air from the airpump is routed at a given time. Lack of a working relief solenoid can cause problems when doing emissions testing.
REALLY hard to believe the wire b/t the ECU and relief solenoid is the problem. More likely a lack of the right signal from the narrow range TPS to the ECU causing the problem. OR the electrical connector is off the relief solenoid. Got me.
There's a factory service manual on this site that has trouble shooting methods for problems like yours. FUEL AND EMISSIONS section. There's also the wiring diagrams available showing the two wires b/t the ECU and the relief solenoid.
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