MAF change

[!kong!]

I bought a new MAF sensor for the Terrano and fitted it. Went out for a test drive and it really pulled well until it had no go at all. Turned off and back on and it ran fine then did it again. Have I got a suspect sensor? It didn't do this before .

 

[!kong!]

I have read that the ecu has to learn the new sensor , is this true ? Do I have to reset it or should it just work. Must admit it wasn't a Bosch one but it wasn't an Ebay chinese copy either

 

[clivvy]

which MAF do you have? Bosch type? I dont think the ECU has to re learn for the MAF although to be fair the ECU does have to adjust a little. Have you any codes coming up? actually, what year is your car?

Could be the MAF has failed already, best check is to unplug it to see if there is any change to what you are getting with it plugged in...

 

[!kong!]

Hi
It's a 1999 tdi . I put the old one back in and went for a drive although down on power it constant all the time. It was a Bosch 0281002207 the new one doesn't have that number and is made by a company called Blue Print . There is no mil light on haven't checked for any codes , not sure how

 

[clivvy]

ah right, there is a guide for checking the codes in the download section. I THINK the 99 is the same method as described in the download, just need a paper clip between chk and grnd and it will flash the MiL a certain amount of times/lengths and you descipher that using the guide. May be worth checking your fuel filter though and pipes, perhaps there is a fueling issue?

 

[!kong!]

I tried the paper clip and as far as I can make out it has two 12 and 95 . Is there a list somewhere to check what they are. Thanks for help ,well worth £10 for all the info !!!

 

[zippy656]

yep there is,
just sent you a PM with the link

 

[!kong!]

Thank you for the code list but it only goes up to 94 I'm sure I'm getting 95 , any ideas

 

[rayf3262]

This may be of use, from a petrol vehicle fault code list:

11 Crank Angle Sensor/Camshaft Position Sensor
12 Air Flow Meter/Mass Air Flow Sensor
13 Engine Coolant Temperature Sensor
14 Vehicle Speed Sensor
21 Ignition Signal
22 Fuel Pump
23 Idle Switch
24 Throttle Valve Switch
25 Idle Speed Control Valve
28 Cooling Fan Circuit
31 ECU
32 EGR Function
33 Heated Oxygen Sensor
34 Knock Sensor
35 Exhaust Gas Temperature Sensor
36 EGR Control-Back Pressure Transducer
37 Knock Sensor
38 Right hand bank Closed Loop (B2)
41 Intake Air Temperature Sensor
42 Fuel Temperature Sensor
43 Throttle Position Sensor
45 Injector Leak
47 Crankshaft Position Sensor
51 Injector Circuit
53 Oxygen Sensor
54 A/T Control
55 No Malfunction
63 No. 6 Cylinder Misfire
64 No. 5 Cylinder Misfire
65 No. 4 Cylinder Misfire
66 No. 3 Cylinder Misfire
67 No. 2 Cylinder Misfire
68 No. 1 Cylinder Misfire
71 Random Misfire
72 TWC Function right hand bank
73 TWC Function right hand bank
76 Fuel Injection System Function right hand bank
77 Rear Heated Oxygen Sensor Circuit
82 Crankshaft Position Sensor
84 A/T Diagnosis Communication Line
85 VTC Solenoid Valve Circuit
86 Fuel Injection System Function right hand bank
87 Canister Control Solenoid Valve Circuit
91 Front Heated Oxygen Sensor Heater Circuit right hand bank
94 TCC Solenoid Valve
95 Crankshaft Position Sensor
98 Engine Coolant Temperature Sensor
101 Front Heated Oxygen Sensor Heater Circuit right hand bank
103 Park/Neutral Position Switch Circuit
105 EGR and EGR Canister Control Solenoid Valve Circuit
108 Canister Purge Control Valve Circuit

 

[clivvy]

in that case 12 and 95 make a lot of sense. CKP will certainly affect power, but the worse the CKP gets you'd be getting stalling etc. As for 12, well, thats suggests there is still an issue with the MAF....or the wiring perhaps? will be worth tracing the wiring from the plug down below the air box, check for kinks, cuts etc. clean the plug also.

Could also clean the CKP, but im not sure where it is on yours. Some have it on the front between the belts right side as you look at the engine, others in the bell housing i think...!?

 

[!kong!]

Thanks for all your help . I'll get another MAF sensor and check the wiring.

 

[!kong!]

Sorry one last question does the crank sensor have any imput to the rev counter ?

 

[rayf3262]

Sorry one last question does the crank sensor have any imput to the rev counter ?

Yes it does, the rev counter is driven by a signal from the ECU, the ECU primarily uses the CKPS to determine engine speed.

 

[!kong!]

That is probably why my rev counter doesn't work then ! Thanks again everyone