Temp Gauge HELL
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RatchRoyal

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Temp Gauge HELL
« on: September 29, 2024, 06:58:09 PM »
Hi all.

So my coolant gauge does not work. The car does not overheat as I just did a load of maintenance on it and all runs well, bled well, heat from the dash etc. When I turn on the ignition, all the gauges jump to life as normal as does the temp gauge and sits the bottom of BLUE ready to rise - so I assume it is getting voltage. But no matter how long I run the car, it does not budge one bit. Here is what I've tried:

New coolant sensor - NOTHING
Tightened nut on back of gauge - NOTHING
Grounded Pin 4 of C101 Plug - NOTHING
Grounded Coolant Temp Connector Pin - NOTHING
Tried three different clusters - NOTHING

I looked for the infamous C191 plug when I had the intake manifold off but there was no sign of one? The temp sensor runs to the nearby junction box under the manifold where all sensors and injector wiring join which is sealed and looked spotless - the guess straight up into the bulkhead via a thickly ribbed sleeve. In any case, Grounding Pin 4 of the C101 would eliminate an issue there.

Does anyone have ANY ideas? I cannot really drive it without a working temp gauge, even if it is running just fine.
« Last Edit: October 09, 2024, 12:32:42 PM by RatchRoyal »
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RatchRoyal

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Re: Temp Gauge HELL
« Reply #1 on: September 30, 2024, 04:44:05 PM »
Could REALLY use some help gang...
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keflaman

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Re: Temp Gauge HELL
« Reply #2 on: October 06, 2024, 02:39:49 PM »
I honestly don't know why this forum hasn't followed suite and faded off into the great unknown like many in the past. It was probably the best and most mature on the internet in its day. Anyway...

First thing everyone checks is to make sure the the instrument panel nut to the gauge is tight. You've tried three different IPs, so that's out of the equation.

Make sure you're connectors aren't crossed and installed correctly (refer to attachment).

Is your engine ground strap to frame in good condition?

Do a continuity check on the wire from the sensor to the gauge.

Open another tab and type in "temp gauge and m42club.com" for other ideas and suggestions.

Good luck and don't give up!
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RatchRoyal

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Re: Temp Gauge HELL
« Reply #3 on: October 06, 2024, 02:47:17 PM »
Thanks  dudes.

It can only really be the wiring between sensor and gauge and that’s a pretty simple path.

One thing I noticed is there was no sign of a C191 plug.

The junction box under the manifold (unique to M42) goes straight up to the bulkhead look.

Is this correct there’s no C191??
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keflaman

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Re: Temp Gauge HELL
« Reply #4 on: October 09, 2024, 10:20:01 AM »
According to the 318is ETM, C191 is located rear of the LH top corner of the engine. Reference fig 1, 7000-1. 8500-10 shows a picture of the connector pinning.
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RatchRoyal

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Re: Temp Gauge HELL
« Reply #5 on: October 09, 2024, 11:20:18 AM »
Quote from: keflaman on October 09, 2024, 10:20:01 AM
According to the 318is ETM, C191 is located rear of the LH top corner of the engine. Reference fig 1, 7000-1. 8500-10 shows a picture of the connector pinning.

Is it the one pictured? I thought that was the C101? Or is that in fact the C191 and the C101 is the OBD port?
« Last Edit: October 09, 2024, 12:30:34 PM by RatchRoyal »
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RatchRoyal

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Re: Temp Gauge HELL
« Reply #6 on: October 09, 2024, 12:35:53 PM »
Quote from: keflaman on October 09, 2024, 10:20:01 AM
Reference fig 1, 7000-1. 8500-10 shows a picture of the connector pinning.

Where can I find this document?
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keflaman

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Re: Temp Gauge HELL
« Reply #7 on: October 09, 2024, 11:08:44 PM »
Quote from: RatchRoyal on October 09, 2024, 11:20:18 AM
Quote from: keflaman on October 09, 2024, 10:20:01 AM
According to the 318is ETM, C191 is located rear of the LH top corner of the engine. Reference fig 1, 7000-1. 8500-10 shows a picture of the connector pinning.

Is it the one pictured? I thought that was the C101? Or is that in fact the C191 and the C101 is the OBD port?

It's in that area according to what I can tell in the manual picture.

You can download the manual from the FAQ/Reference, M42 Reference section. It's pinned 5th thread down from the top.
« Last Edit: October 09, 2024, 11:11:34 PM by keflaman »
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RatchRoyal

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Re: Temp Gauge HELL
« Reply #8 on: October 10, 2024, 01:36:01 PM »
Quote from: keflaman on October 09, 2024, 10:20:01 AM
According to the 318is ETM, C191 is located rear of the LH top corner of the engine. Reference fig 1, 7000-1. 8500-10 shows a picture of the connector pinning.

The C191 plug is on page (7000-o) but when I had the whole intake manifold off yet there was no sign of it.

It's not shown in the engine loom diagram either (see attached).
« Last Edit: October 10, 2024, 03:07:55 PM by RatchRoyal »
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RatchRoyal

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Re: Temp Gauge HELL
« Reply #9 on: October 19, 2024, 01:56:01 PM »
I’m convinced there is no C191 plug on this car. All sensors and fuel injection wiring go into that box which goes right to the bulkhead.

Can anyone clarify / confirm?
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