Code 32 Cant Figure This Out

Code 32 - Code 32 – EGR voltage below closed limit
Missing VREF (5v), 10 pin connector problems, EGR wiring connector problems

Let’s put on our Inspector Gadget propeller head beanies and think about how this works:
The EGR sensor is a variable resistor with ground on one leg and Vref (5 volts) on the other. Its’ resistance ranges from 4000 to 5500 Ohms measured between Vref & ground, depending on the sensor. The center connection of the variable resistor is the slider that moves in response to the amount of vacuum applied. The slider has some minimum value of resistance greater than 100 ohms so that the computer always sees a voltage present at its’ input. If the value was 0 ohms, there would be no voltage output. Then the computer would not be able to distinguish between a properly functioning sensor and one that had a broken wire or bad connection. The EGR I have in hand reads 700 Ohms between the slider (EPV) and ground (SIG RTN) at rest with no vacuum applied.

As vacuum is applied, the voltage on the slider increases (EVP). As the voltage increases, the computer knows the how much the EGR valve is opened and how much exhaust gas is being recirculated. It uses the load table to calculate the amount of exhaust gas required depending on RPM, Mass Air Flow, ACT, ECT & TPS. It then sends a signal to the Electronic Vacuum Regulator to hold, increase or decrease the vacuum being applied to the EGR valve.

Theory class is over now, let’s spin up our propeller head beanies and get with it… Go Gadget, Go…

Measure the resistance of the EGR sensor between the two end pins. You should see between 3500 to 5500 Ohms. With the sensor removed, measure the resistance again while pressing on the plunger. You should see the resistance drop from its high value to a low reading of 200-700 ohms depending on the sensor. No resistance readings, or values way out of range, the sensor is bad.
If the Orange white wire has Vref, (5 volts =/-.25 volt) then you have some wiring problems because the computer isn’t seeing the minimum voltage on the EVR pin. Ohm the wiring back to the computer. Check for resistance between the brown/lt green wire on the EGR sensor and pin 27 on the computer: you should have less than 1 ohm. Repeat the process for the orange/white wire and pin 26. Do it again between the black/white wire and pin 46. In no case should you have more than 1 ohm. Remember that resistance checks are always done with the power off the circuit.



See the graphic for the 10 pin connector circuit layout.




Voltage and resistance checks are good: Here’s an EGR test procedure I copied from cjones

to check the EGR valve:
bring the engine to normal temp.
connect a vacuum pump to the EGR Valve
apply 5 in vacuum to the valve.
if engine stumbled or died then EGR Valve and passage(there is a passageway through the heads and intake) are good.
if engine did NOT stumble or die then either the EGR Valve is bad and/or the passage is blocked.
if engine stumbled, connect vacuum gauge to the hose coming off of the EGR Valve
snap throttle to 2500 RPM’s (remember snap the throttle don't hold it there).
did the vacuum gauge show about 5 in vacuum?

if not, check for manifold vacuum at the EGR vacuum valve.
if you have manifold vacuum then connect vacuum gauge to the EGR valve side of the vacuum valve and snap throttle to 2500 RPM’s.
should read about 5 in vacuum
End of cjones's test.

If the test procedure fails to provide proper vacuum, check vacuum feed lines for cracks & damage. If the vacuum lines are good, check the electrical wiring to the EVR. If the EVR electrical wiring is good, look for 12 volts on the red wire for the EVR. If the 12 volts is good, look for a varying voltage on the dark green wire on the EVR. Case of last resort, replace the EVR and then the computer

Hello all. new guy here. Im getting similar code 31 instead. engine seems to run good just not at its best. been a while since car had an engine in it. newer engine and car has been revived. many new parts. havent put many miles on it yet still needs alignment and smog after I get it running perfect. I drive it down the street and engine bogs and studders at 2k rpm in each gear with 5 spd t5 trans when I go heavy on throttle. could this be related to egr problem? any suggestions? im not sure if vacuum is ran correct. egr is from original engine and there were no problems with it. Thanks in advance.

Mike

89withatrunk said:

Hello all. new guy here. Im getting similar code 31 instead. engine seems to run good just not at its best. been a while since car had an engine in it. newer engine and car has been revived. many new parts. havent put many miles on it yet still needs alignment and smog after I get it running perfect. I drive it down the street and engine bogs and studders at 2k rpm in each gear with 5 spd t5 trans when I go heavy on throttle. could this be related to egr problem? any suggestions? im not sure if vacuum is ran correct. egr is from original engine and there were no problems with it. Thanks in advance.

Mike

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You need to start your own post and not hijack someone else's post. It's bad manners and makes for confusion for what answer is for what user.