2002 Subaru Legacy B4 Injectors or wiring

Tiny
TSENNY
  • MEMBER
  • 2002 SUBARU LEGACY
  • 2.0L
  • 4 CYL
  • TURBO
  • AWD
  • AUTOMATIC
  • 98,000 MILES
I recently imported a 2002 Subaru Legacy B4 and it came with a blown 100A main fuse. I replaced with a generic fuse but seems like there is a power problem which may be causing injector and cam position sensor throwing a check light for a few seconds when I run an accessories such as power windows. The check light does not stay on but just flickers for a few seconds and disappears The problem is worse at night when I switch on the lights as it causes the accelerator not to respond for a few seconds as the car refuses to take off and then the car takes off with normal power. In the afternoon without the lights it drives fine and is powerful but the problem now is that the fuel consumption is now pretty high. I do not know if it is related but the fog lights also are not working
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Tuesday, August 18th, 2015 AT 12:29 AM

6 Replies

Tiny
HMAC300
  • EXPERT
Check fuse and relay for fog lights under hood. Then check battery ground to body and engine to body. Also check battery for condition including load test.
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Tuesday, August 18th, 2015 AT 6:17 AM
Tiny
TSENNY
  • MEMBER
****UPDATE*******

We are pulling P0340 error code which is Camshaft Position Sensor Circuit A problem. However, we replaced the sensor found on the timing belt cover and it showed the same error. Then my friend took his sensor (we have exactly the same car) and put it on mine and still shows the same error code. We then took the one from my car and put it on his car and surprisingly that sensor we think is dead works on my friend's car. My friend's auto electrician suggested that the ECU could be getting bad (we couldnt do a test on that claim)

Is it the circuit or it is something else. I called my mechanic and told him the results of the investigation and he says if it continually pops the same error code it is most likely the VVT system (something like that).

Could it be that we were replacing the wrong sensor?
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Monday, September 14th, 2015 AT 6:35 AM
Tiny
HMAC300
  • EXPERT
Our manual only shows a 2.5L so you must be out of US as we don't have that submodel here. But pic shows cam sensor. See pics for diagnosis
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Monday, September 14th, 2015 AT 7:13 AM
Tiny
TSENNY
  • MEMBER
Whenever I start the car it stumbles hard and the CEL will flash (warm or cold) then after about 10-15 seconds it will catch it self and idle fine, free rev fine etc. Then once I put the car in "D" and go to pull off it starts stumbling again and the CEL starts flashing again. If I keep it about 15%-20% throttle it will eventually clear out and drive fine for the most part. After this little procedure the car will drive fine until I turn on the A/C or lights or wipers, then the car will stumble bad when I come to a stop and/or try to pull off. The stumbling issue is worsened considerably by having the A/C on.

I have put a code reader on the car and the only code I was getting was P0340 Cam Sensor Bank 1. I then proceeded to change the cam sensor next to the oil fill (is there another one?) And that didn't solve the problem. Checked the codes again, same code.
I have no idea on what else it could be, once the car is driving it boosts fine, drives fine etc but getting bad fuel mileage
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Thursday, September 24th, 2015 AT 12:59 PM
Tiny
HMAC300
  • EXPERT
Because you imported the car we dont' have any info for the 2.0L as it's not an engine that is used in US. What is sent is for a 2.5L I have got the checks to do from a impresa with the 2.0L see pics on how to diagnose this. You may have a wire grounded out on engine or similar. See piccs for diagnosis
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Thursday, September 24th, 2015 AT 1:30 PM
Tiny
HMAC300
  • EXPERT
Also check the main relay inside car and grounds on engine on left front and rears. Also recheck all fuses in underhood fuse box
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Thursday, September 24th, 2015 AT 1:36 PM

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