Confused with Electrical Cicruit for Secondaries

[Marccus]

I still can't get my secondaries to work.

I've tried 3 different groups of solenoid electronics and the cylinder (I don't know what to call these pieces) and still nothing. The position of the butterflies remains in the same position as when the car is off - open

I've installed a new PCM, still nothing

I disconnected the wiring harness connector at the PCM to test the continuity of the lines between the pins on the PCM connector and the pins on the connector at the solenoid.


There are two wires for the connector, Red and light green/ pink.

My wiring diagrams (the large fold out kind) indicate the following:

R line as 361 14 R AB
LG/P line as 965 18 LG/P AB

Line 361 is connected to Pin 37 on the PCM
Line 965 is connected to Pin 32 on the PCM

There is continuity between Pin 37 on the PCM connector and the appropriate pin at the solenoid connector, and Pin 32 and the appropriate pin at the solenoid connector.

Thus, there is no open in the wires.

I get the following voltages:

Key in off position: wire 361 is 0 volts
wire 965 is 0 volts

Key in start position or engine on: wire 361 is 12 volts
wire 965 is 0 volts.

There is no continuity between wire 965 and ground.

Therefore wire 965 is not grounded and the wire from pin 32 (965 18 LGH-P AB) on the PCM connector is only connected to the pin on the connector at the solenoid. This is also shown on the wiring diagrams.

How is wire 965 energized if this wire has no other connection from Pin 32 at the PCM except the pin at the solenoid connector?

Can anyone advise?

 

[Slo-Sho]

Have you checked to make sure that vacuum is present at the small canister on the back of the intake manifold?

 

[itwonder]

Marccus, you need to take this step by step. Do not worry about the PCM circuit right now. First verify the IMRC (Intake Manifold Runner Control) solenoid valve and vacuum lines are working correctly. Unplug the harness from the IMRC. Clip a red alligator clip lead onto the solenoid pin where the red wire on the harness use to connect. Connect the other end of that lead to 12 volts. Connect a second clip lead to the other solenoid pin. Start the car. Touch the second clip lead to ground, then remove from ground. Do the secondary vacuum actuators move as you ground/unground that connection? They should.

Here are a couple of photos from when I was bench testing an IMRC solenoid valve that might help you understand how to control the valve bypassing the PCM circuit. The yellow clip lead connects to 12 volts . The black lead connects to ground, or is open.

 

[Marccus]

Thanks.

I haven't been around for awhile and haven't been able to attack this problem.