03 S80 T6 Check Engine Light, Code is 234
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chall37128
- Posts: 2
- Joined: 10 November 2010
- Year and Model: S80 T6 2003
- Location: Nashville
03 S80 T6 Check Engine Light, Code is 234
Just got this 2003 S80 T6 and the check engine light will come on for some time if you really accellerate and get the turbo kicked in. dont see any obvious vacume leaks Any ideas?
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billofdurham
- MVS Moderator
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- Year and Model: 855, 1995
- Location: Durham, England
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Welcome to Matthew's Volvo Site.
Code P0234 corresponds to Volvo code ECM-6805. The attached is from VADIS:
Basic checks are to all hoses attached to the turbo and the turbo control valve for blockages, damage or trapped. After that further testing requires equipment not normally considered DIY.
Bill.
Code P0234 corresponds to Volvo code ECM-6805. The attached is from VADIS:
S80 ECM-6805.pdf- (165.39 KiB) Downloaded 837 times
Bill.
Work was good - retirement is better.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
1996 850GLT 2.5 20v Estate Manual.
1995 Peugeot Boxer 2.5Tdi Autosleeper.
Previously:
1984 244DL, Manual, Beige.
1987 744GLE, Manual, Green.
1991 960 3.0 24v, Auto, Silver.
1994 940T Wentworth, Auto, Blue.
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boosted5cyl
- Posts: 1100
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- Year and Model: '98 V70 T5, '99 S80
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Theres a few possible sources...Might be worthwhile to attache a boost pressure gauge and see what the pressure is under there...
Vacuum pipes as you say is one source for this code. Make sure you check all of the pipes from the TCV (Turbo Control Valve) solenoid. Its attached to the airbox and has three vacuum pipes connected to it. Inspect the pipes, right down to the metal pipes at the top rear of the engine and furthermore inspect the vacuum pipes that go from the metal pipe to each turbo at the wastegate actuators, right at the very rear of the motor.
Could be a sluggush\crudded up TCV solenoid. Remove it, clean it out by excersising it (open and close over and over) with 12v (polarity doesnt matter) and putting your solvent of choice through it.
The pressure for the wastegate actuators might set too high. It should be around 6.5psi (45Kpa). I've attached a guide on how you you can adjust/check this. You can use a cooling system test pump or a mityvac to check the reading. Basically, undo the adjutment screw, pull the actuator rod off the wastegate lever. Then disconnect the vacuum pipe on the actuator and connect your mityvac, set the pressure, hold the wastegate closed by hand and turn the adjuster until the hole drops right onto the pin on the wastegate lever.
Possibly the wastegate actuator(s) or gates themselves are stuck (not sure how often this really happens). You can check this by hand by trying to pull them open.
Bad compressor bypass valve....In the '99 this valve is on the pipe that leaves the intercooler, not sure if its the same with your 03. It has a spring and diaphram inside that can get tired.
Bad MAP sensor (on same pipe as above, upstream of the CBV) thats getting trigger happy thinking the boost is too high when its not.
Looks like a MAF can cause this too: http://volvospeed.com/vs_forum/index.ph ... ge__st__40
Vacuum pipes as you say is one source for this code. Make sure you check all of the pipes from the TCV (Turbo Control Valve) solenoid. Its attached to the airbox and has three vacuum pipes connected to it. Inspect the pipes, right down to the metal pipes at the top rear of the engine and furthermore inspect the vacuum pipes that go from the metal pipe to each turbo at the wastegate actuators, right at the very rear of the motor.
Could be a sluggush\crudded up TCV solenoid. Remove it, clean it out by excersising it (open and close over and over) with 12v (polarity doesnt matter) and putting your solvent of choice through it.
The pressure for the wastegate actuators might set too high. It should be around 6.5psi (45Kpa). I've attached a guide on how you you can adjust/check this. You can use a cooling system test pump or a mityvac to check the reading. Basically, undo the adjutment screw, pull the actuator rod off the wastegate lever. Then disconnect the vacuum pipe on the actuator and connect your mityvac, set the pressure, hold the wastegate closed by hand and turn the adjuster until the hole drops right onto the pin on the wastegate lever.
Possibly the wastegate actuator(s) or gates themselves are stuck (not sure how often this really happens). You can check this by hand by trying to pull them open.
Bad compressor bypass valve....In the '99 this valve is on the pipe that leaves the intercooler, not sure if its the same with your 03. It has a spring and diaphram inside that can get tired.
Bad MAP sensor (on same pipe as above, upstream of the CBV) thats getting trigger happy thinking the boost is too high when its not.
Looks like a MAF can cause this too: http://volvospeed.com/vs_forum/index.ph ... ge__st__40
- Attachments
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- VADIS-Turbo-Pressure-Regulator-Check.pdf
- (197.15 KiB) Downloaded 1030 times
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