help need to understand fault codes.
05 July 2008, 07:06 PM
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help need to understand fault codes.
Hi all,
my engine management light came on yesterday and had a friend come and find out the fault codes.
The codes were:
P1091 Tumble generator valve #1 (RH) malfunction (stuck close)
P1092 Tumble generator valve #2 (LH) malfunction (stuck open)
P1095 Tumble generator valve circuit #1 (over current)
Now i am no mechanic, so am wondering if someone could tell me:
a) what problem is, as i have no idea what a tumble generator is.
b) what the fix is.
many thanks
Paul
my engine management light came on yesterday and had a friend come and find out the fault codes.
The codes were:
P1091 Tumble generator valve #1 (RH) malfunction (stuck close)
P1092 Tumble generator valve #2 (LH) malfunction (stuck open)
P1095 Tumble generator valve circuit #1 (over current)
Now i am no mechanic, so am wondering if someone could tell me:
a) what problem is, as i have no idea what a tumble generator is.
b) what the fix is.
many thanks
Paul
05 July 2008, 07:31 PM
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Strange one this as it's showing a fault with both tumble valves!
Code P1091 diagnostic tells you to check for the presence of code P1095 and carry out the troubleshooting for that code.
This is as follows
Code P1092 is for the L/H valve stuck open and as you have no other associated codes it's troubleshooting is as follows.
This next picture shows where they live, you really don't want to be taking them off if you don't have to. I took my inlet manifold off earlier in the year to fix a fuel smell and it's a but of a pain - ok if you're handy with spanners but still a bit of a faff.
Seems odd that both of yours have failed at the same time, i'd check the two large wiring harness connectors down by the side of the battery. Disconnect the battery and check no water has got inside the connectors.
If that's ok , i'd check the connectors on the tumble valves themselves.
Did your mate try and clear the fault codes? Possible it was just a blip with the ECU.
Let us know how you get on
Code P1091 diagnostic tells you to check for the presence of code P1095 and carry out the troubleshooting for that code.
This is as follows
Code P1092 is for the L/H valve stuck open and as you have no other associated codes it's troubleshooting is as follows.
This next picture shows where they live, you really don't want to be taking them off if you don't have to. I took my inlet manifold off earlier in the year to fix a fuel smell and it's a but of a pain - ok if you're handy with spanners but still a bit of a faff.
Seems odd that both of yours have failed at the same time, i'd check the two large wiring harness connectors down by the side of the battery. Disconnect the battery and check no water has got inside the connectors.
If that's ok , i'd check the connectors on the tumble valves themselves.
Did your mate try and clear the fault codes? Possible it was just a blip with the ECU.
Let us know how you get on
05 July 2008, 07:34 PM
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p.s. This is the best explanation i've found for what the tumble valves actually do!
The diameter and length of each runner in the manifold are initially determined by computer. Every effort is made to ensure each runner is exactly the same length, with smooth turns. This allows for a smooth, even flow of air to the cylinders.
In some cases, however, a smooth flow of air isn’t the best thing. Selected Subaru models feature an intake that “tumbles” the incoming air on purpose. This is the case with the high-performance Impreza WRX. Its intake includes tumble generator valves directly above the fuel injectors. When the engine is at idle, these valves close and bypass the incoming airflow through a passage to increase the swirl of the air/fuel mixture, resulting in an engine that operates more cleanly. Other benefits include easier cold starts, reduced emissions and efficient low-speed operation. In fact, despite its startling power and acceleration, the WRX engine burns so cleanly it qualifies as a Low Emission Vehicle (LEV) under today’s EPA guidelines.
In some cases, however, a smooth flow of air isn’t the best thing. Selected Subaru models feature an intake that “tumbles” the incoming air on purpose. This is the case with the high-performance Impreza WRX. Its intake includes tumble generator valves directly above the fuel injectors. When the engine is at idle, these valves close and bypass the incoming airflow through a passage to increase the swirl of the air/fuel mixture, resulting in an engine that operates more cleanly. Other benefits include easier cold starts, reduced emissions and efficient low-speed operation. In fact, despite its startling power and acceleration, the WRX engine burns so cleanly it qualifies as a Low Emission Vehicle (LEV) under today’s EPA guidelines.
05 July 2008, 08:01 PM
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many thanks for the reply. that has certainly helped me understand a little better what's going on.
Yes the codes were cleared, so could this possibly a blip or would you suggest i get someone to have a look at the connectors on the valves, as i really am not mechanically minded.
cheers
Yes the codes were cleared, so could this possibly a blip or would you suggest i get someone to have a look at the connectors on the valves, as i really am not mechanically minded.
cheers
07 July 2008, 11:12 PM
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Touch wood, light has stayed off. However i am still going to get a subaru specialist i trust to check to make sure there are no probs.
Then, and this is a very hard decision, even if it is just a blip may be letting the scoob go.....even though i love it to bits.
Then, and this is a very hard decision, even if it is just a blip may be letting the scoob go.....even though i love it to bits.
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