Bosch ECU pinout

IanR · Unread post by **IanR** » 04 Jan 2003, 16:39

Anyone know of a reliable source for connection-info for the 37-pin Bosch Motronic MP5.1.1 ECU as fitted to Xantia 16v petrol engines?
Having wasted money on the Haynes manual and found that it wrongly quotes this as being a 35-pin unit (Which calls into doubt anything else it might say!!) I'm stumped as to getting accurate connection-info.
Fault: Fuel-pump relay not engaging. Relay itself is OK.
Edited by - IanR on 04 Jan 2003 11:49:01

assael1 · Unread post by **assael1** » 05 Jan 2003, 00:31

TRY TO HELP YOU ,BUT I NEED YEAR AND CHASIS NO. TO GET THE RIGHT BOOK FROM MY WORKSHEEP.IS THE CAR EQUIPPIED WITH 'G' SHOCK SWITCH ? IF YES,PUSH TO RESET .TRY TO START. TELL ME IF ITS WORK.SEE YOU SOON,

IanR · Unread post by **IanR** » 06 Jan 2003, 02:07

VF7**************[VIN obfuscated, can be read by forum staff] 1996
16v 1.8 DOHC engine.
Bosch MP5.1.1 ECU. (37-pin) and 15-pin dual relay.
It does have an inertia switch, but I don't think this is responsible. It checks-out as OK. HST, the wiring to it might be unreliable -this is where I need the ECU pinout to check it through.
Anyway, it started first time today

after going over the whole fuel/ignition system thoroughly yesterday.
Think I may have cured it (hopefully!) but info on injection box pinout and if possible the procedure for reading diagnostic codes would be helpful anyway if available.
Thanks, Ian.
Edited by - IanR on 05 Jan 2003 21:14:10

jeremy · Unread post by **jeremy** » 06 Jan 2003, 15:06

Ian
Have you tried one of the Gunsons code readers? They are available for a number of systems and cost about £20. I've never used one so can't tell you more but they are available in Halfords and other accessories shops.
jeremy

assael1 · Unread post by **assael1** » 06 Jan 2003, 22:12

SORRY MAN I CANT GIVE YOU THE ALL SHEET.REMOVE THE ECU,THEN CHEK ON PINS 2,19 TO EARTH 0-1 OHME.REMOVE THE RELALS UNIT AND CHEK GOOD CONECTION BETWEEN : PIN 3 OF ECU AND PIN 10 OF 15 PINS CONECTOR.PIN 37[ECU] TO PIN 4 [RELAY], CHEK PARMENNENT BATTARY VOLTAGE ON PINS:11,8,15[15 PINS RELAYS].TURN IGNITIN SWITCH CHEK VOLTAGE ON PINS 2 , 14 [RELAY].CHEK GOOD CONECTION BETWEEN PIN 9 [RELAY] AND + TERMINAL OF FUEL PUMP.CHEK PARMENENT VOLTAGE ON PIN 18 [ECU]
HOPE I HELP

IanR · Unread post by **IanR** » 07 Jan 2003, 01:14

Thanks for help. Yes I was looking at the Gunsons readers today, HST £20 is a bit steep for what appears to be a LED and a switch! There's also the issue that it might not cover this model - hard to be sure.
The connector info will be useful, thanks. Car ran fine today, first working day this year so I needed it for a site visit. Extremely cold (never got above -1C all day) yet it started instantly.
I'm hoping I 've nailed the problem.
I want to check the lambda sensor action anyway, just in case it might be running an incorrect mixture. It's a near-new cat, and I don't want to ruin it.

assael1 · Unread post by **assael1** » 07 Jan 2003, 22:20

you can chek the lambda [oxigen] sensor in very easy way. the sensor have 2 conector. one red colour 2 white wires conected,for sensor heater.another white colour grey and black wires conected for milivoltage sens for ecu .first,disconect the red conector chek impadence 4-6 ohm acceptable.run the engine and with tester and diode chek batarry voltage WARNING:DO NOT CHEK WITHOUT DIODE IT'LL BLOE ECU EARTH GATE.disconect the white conctor and chek with multimeter change of voltage between 0-1000 mV . if you chek it all OK ,the sensor just fine.
happy diagnosis