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significance of different cel codes w/green connectors

dmz
 

1994 ej22 in an 85
Here's what I wondering about:

When I first start up, with the van only sitting there at idle, I immediately get 3 codes. 35, 42, 21.

But after driving for awhile, I get those plus 33 and 51.

This is only with the green connectors.

So is there a significance to the separation of codes?
 

From

35 Purge Control Solenoid or Circuit
42 Idle Switch or Circuit
21 Coolant Temperature Sensor or Circuit

33 Vehicle Speed Sensor (VSS) or Circuit
51 Neutral Switch (Manual Transmission Models)

I'd say, at first brush, that you do not have the subsystems in the codes connected properly or even present at all!
 

Hi Greg,
Normally the ECU will not report codes immediately with the Green Test Mode connectors connected - but if the ECU see serious engine performance issues it will report them immediately. In your case:

Code 35 CPC solenoid - always seems to report immediately - you need to check the solenoid valve to see if it has gone open circuit - common failure mechanism. Correct this one first and see what happens to the others.

Code 21 - coolant temperature - check to be sure it is plugged in.

Code 42 - Idle switch - check to be sure the TPS is set so the idle switch is closed when the throttle is closed.

The codes 51 and 33 usually do not come up until the engine has run at >2000 rpm for 45 seconds.

I hope this makes some sense,
Tom
Burlington ON

--- In subaruvanagon@..., "dmz" <dmzwesty@...> wrote:

1994 ej22 in an 85
Here's what I wondering about:

When I first start up, with the van only sitting there at idle, I immediately get 3 codes. 35, 42, 21.

But after driving for awhile, I get those plus 33 and 51.

This is only with the green connectors.

So is there a significance to the separation of codes?
dmz
 

Thanks Tom,
That makes perfect sense, and I appreciate the break-down.

--- In subaruvanagon@..., "Tom Shiels" <tom@...> wrote:

Hi Greg,
Normally the ECU will not report codes immediately with the Green Test Mode connectors connected - but if the ECU see serious engine performance issues it will report them immediately. In your case:

Code 35 CPC solenoid - always seems to report immediately - you need to check the solenoid valve to see if it has gone open circuit - common failure mechanism. Correct this one first and see what happens to the others.

Code 21 - coolant temperature - check to be sure it is plugged in.

Code 42 - Idle switch - check to be sure the TPS is set so the idle switch is closed when the throttle is closed.

The codes 51 and 33 usually do not come up until the engine has run at >2000 rpm for 45 seconds.

I hope this makes some sense,
Tom
Burlington ON


--- In subaruvanagon@..., "dmz" <dmzwesty@> wrote:

1994 ej22 in an 85
Here's what I wondering about:

When I first start up, with the van only sitting there at idle, I immediately get 3 codes. 35, 42, 21.

But after driving for awhile, I get those plus 33 and 51.

This is only with the green connectors.

So is there a significance to the separation of codes?

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