Relays ?

[over_the_hill]

While fiddling about with my Hot Start Kit I decided to make a note of a few of the electrical bits with a view to buying a couple of spares to keep in the boot - just in case. The main bits of interest are the Relays down in the footwell.

In the bible pages 240-243 in the fuseboard diagrams there is an Ignition Feeds Relay M0383.

Having pulled this out there are no real identification marks on it other than it is Siemens, is 4-pin and 12v and has R6H3 in the bottom corner. Is this just a general 4-pin 12v Relay.

On the flying leads there are two identical 5-pin Relays (Silver in colour in my car). Again there are no real identification marks on these.

Can anyone supply any further information or part numbers for these.

Thanks.

[BrianMillar]

The two silver relays in the loom are the fuel pump and ignition relays. They are Bosch items with what looks like a red felt tip pen stripe across them.
I haven't figured out which relay does what but they both have to be in place for the fuel pump to run.

I am not sure how many variants of wiring there are for the Chimaera but the fuse panel in my 98 Chimaera 500 does not match any of the panel drawings in the bible.

I think what is in the bible is a good starting point for fault finding but don't assume it will exactly fit your car.

By the way I am trying to obtain a good scanned copy of the wiring diagram as the drawing in my bible is not of good enough quality to identify all the wiring colours. So if anyone has one please let me know.

Thanks

[Cider Andy]

Both are fuel injection relays. They are identical, are made by Bosch and the part number is 0732014112. Good motor factors sell them for around £6 although some places want £15 and upwards.

One of them, the 'main' relay, powers the injectors and air-flow meter. The other, the 'fuel pump' relay, powers the fuel pump, the lambda sensor heaters and the purge valve. Both relays are controlled by the fuel injection ECU.

The differ from a standard 5-pin relay in that both pins 87 and 87a are connected internally whereas a 'standard' relay would have one of these contacts connected to pin 30 with the relay energised and the other connected when not energised.

[spend]

over_the_hill said:

Having pulled this out there are no real identification marks on it other than it is Siemens, is 4-pin and 12v and has R6H3 in the bottom corner. Is this just a general 4-pin 12v Relay.

They are just commonly available 70a relays, the blades are bigger than std relays

over_the_hill said:

On the flying leads there are two identical 5-pin Relays (Silver in colour in my car). Again there are no real identification marks on these.

Everyone uses the bosch relays, but as far as I can tell they are just standard twin make break relays with diode. I use a couple of these in my fusebox so they are available to swap in an emergency or for diagnostics. Most of the relays in the fusebox are single make/break, but as the central pin is not connected in the fusebox twins can be inserted, unless the switching is wired the wrong way round the diode will not adversely affect anything. I have converted my fuse box to use a couple of twin make break relays, so as a rule all the std relays are make/break so if one fails I can rob the horn or fogs to maintain lights or ecu etc.

Dave

[jonjo]

Just be careful - I would stick with the Bosche ones - a mechanic fitted a different make to my Griffith several years ago. Big mistake - sent power to AFM when ignition off and cut power when ignition on. Car ran as if it was stone cold - limp home mode. Took me a while to suss that one out.

jonjo