Electrics: 850: How to build a DIY Flash Code Reader 850 Phase 2, '70 10V

[Jod T5]

Originally Posted by malc-c

Thanks for the advice. In between posting I knocked up an LED and a tactile switch on a bit of stripboard and soldered a few wires on it too..

Armed with the DIY tester and a copy of the first post I toddled off to the car. I followed the instructions and connected the wires to pins 16, 3 and 5. The LED did not light as stated, however I turned the ignition on to II and pressed the switch for around 2 seconds which caused the LED to light whilst the switch was pressed. The LED went out and then shortly after there was three flashes as described

I then moved the wire from 3 to pin 6 and repeated the procedure, but this time the LED did diddly squat Repeating this several times I still couldn't get the LED to display any code flashes at all

Thanks for the help though

Malc

sorry malcy, the flash code reader is only designed for the 4.3 motronic fitted to the 850's..........
cheers
jod

[malc-c]

Originally Posted by jod t5

sorry malcy, the flash code reader is only designed for the 4.3 motronic fitted to the 850's..........
cheers
jod

Rats !

Thanks for the reply... looks like I'll have to pay Volvo the £65 + VAT to diagnose the problem with my CCU...

[Tarkus]

General Query but seems JodT5 may know, having just read the post about how to make a Code Reader.

My light is on, and the code indicates (according to Haynes) :
idle mixture too weak - or - depending on the actual unit installed, too rich.

I'm erring on the side of weak as it hunts at idle, but still gives umph when asked. Besides I've had Rich and it cost a new Control unit.

is there any way I can adjust the mixture with "a bent pin and chewing gum" or must I seek the assistance of the Dealer Service network.

Thanks for any replies, l now live near Exeter (10miles) if there are any "must go to these people for service" places around.

I want to keep this car!
many thks Tarkus

[Jod T5]

Originally Posted by Tarkus

General Query but seems JodT5 may know, having just read the post about how to make a Code Reader.

My light is on, and the code indicates (according to Haynes) :
idle mixture too weak - or - depending on the actual unit installed, too rich.

I'm erring on the side of weak as it hunts at idle, but still gives umph when asked. Besides I've had Rich and it cost a new Control unit.

is there any way I can adjust the mixture with "a bent pin and chewing gum" or must I seek the assistance of the Dealer Service network.

Thanks for any replies, l now live near Exeter (10miles) if there are any "must go to these people for service" places around.

I want to keep this car!
many thks Tarkus

i saw you posted this elsewere, i would go along with chris roger's comments
cheers
jod

[TheG]

Is there a pin for the auto box codes too?

[Chris_Rogers]

No, you will need a Volvo specific code reader.

However the Auto gearbox is OBDII compliant and you may read a fault code from it if the problem would result in an emissions increase.

[TheG]

bum, so I guess the TCU in 95 cars is different to the 96 cars then, interesting.

[Chris_Rogers]

Yes, that is the case.

[Geoff]

I have tried these codes on my 850 T5 1996 and they seem OK.
89-93 models
1-1-1 No faults.
1-1-2 ECU.
1-1-3 Fuel injectors.
1-1-3 Heated Oxygen sensor-max enrichment sensed (94-up).
1-1-5 Injector #1.
1-2-1 Mass airflow sensor.
1-2-2 Air temp sensor signal.
1-2-3 Coolant temp sensor signal.
1-2-5 Injector #2.
1-3-1 Ignition system RPM signal.
1-3-2 Battery voltage.
1-3-3 Throttle switch signal (idle).
1-3-5 Injector #3.
1-4-2 ECU faulty.
1-4-3 Knock Sensor signal missing or defective.
1-4-4 Fuel system load signal(missing or defective).
1-4-5 Injector #4.
1-5-3 Rear heated oxygen sensor signal.
1-5-4 EGR system-leakage or excessive flow.
1-5-5 Injector #5.
2-1-2 Oxygen sensor signal(front sensor on 94 and later models).
2-1-3 Throttle switch signal.
2-1-4 Ignition RPM signal erratic.
2-2-1 Heated Oxygen Sensor(Rich mixture/part throttle).
2-2-2 Main relay.
2-2-3 Idle valve signal.
2-2-4 Coolant temp sensor signal.
2-2-5 A/C pressure sensor signal.
2-3-1 Lambdfa adjustment.
2-3-1 Heated Oxygen sesnor(lean mixture/part throttle) 94-up.
2-3-2 Lamda adjustment.
2-3-2 Adaptive heated O2 sensor control (94-up).
2-3-3 Idle valve-closing signal.
2-3-4 Throttle switch signal missing.
2-4-1 EGR malfunction.
2-4-5 Idle air control valve-closing signal.
3-1-1 Speedometer signal.
3-1-4 Camshaft position signal missing or defective.
3-1-5 EVAP emission control system.
3-2-1 Cold start valve-signal missing.
3-2-2 Airflow meter hot wire.
3-2-4 Camshaft position siganl erratic.
3-2-5 ECU memory failure.
3-3-5 TCM request for MIL.
4-1-1 Throttle switch signal faulty or missing.
4-1-3 EGR temp sensor signal incorrect or missing.
4-1-4 Turbo boost regulation.
4-1-6 Turbo boost reduction from TCM.
4-2-5 Temp warning level #1.
4-3-1 EGR temp sensor faulty or missing.
4-3-2 High temp warning inside ECU.
4-3-3 No rear knock sensor signal.
4-3-5 Front heated oxygen sensor - slow response.
4-3-6 Rear heated oxygen sensor compensation.
4-4-3 Catalytic converter efficiency.
4-4-4 Acceleration sensor signal.
4-5-1 Misfire - #1 cylinder.
4-5-2 Misfire - #2 cylinder.
4-5-3 Misfire - #3 cylinder.
4-5-4 Misfire - #4 cylinder.
4-5-5 Misfire - #5 cylinder.
5-1-1 Adaptive oxygen sensor control-lean mixture at idle.
5-1-2 Oxygen integrator at max lean running limit.
5-1-3 High temp warning inside ECU.
5-1-4 Engine cooling fan-low speed signal faulty.
5-2-1 Oxygen sensor preheating-front.
5-2-2 Oxygen sensor preheating- rear.
5-3-1 Power stage-group A.
5-3-2 Power stage-group B.
5-3-3 Power stage- group C.
5-3-4 Power stage- group C.
5-3-5 TC control valve signal.
5-4-1 EVAP valve signal.
5-4-2 Misfire - more than one cylinder.
5-4-3 Misfire - at least one cylinder.
5-4-4 Misfire - more than one cylinder/catalytic converter damage.
5-4-5 Misfire - at least one cylinder/catalytic converter damage.
5-5-1 Misfire - #1 cylinder/catalytic converter damage.
5-5-2 Misfire - #2 cylinder/catalytic converter damage.
5-5-3 Misfire - #3 cylinder/catalytic converter damage.
5-5-4 Misfire - #4 cylinder/catalytic converter damage.
5-5-5 Misfire - #5 cylinder/catalytic converter damage.

[embo]

hi mate been trying that for ages now ive got v70 tdi if you look at the data plug mines got pin 3 4 5 7 16 and 13 just trying to resolder lead to go in butneed wiring diagram of data pin wires for it