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Mitsubishi ECU
Mitsubishi ECU fitted to: Chariot, Colt, FTO, Galant
GTO, Lancer, Pajero, Shogun & Space Wagon ECU 1992 - 96
MFI/Hitachi
Non running engine or very poor running
The Mitsubishi engine ECU fitted to these models are common failures
The problem lies with the type of capacitors used inside the ECU, they are prone to damage from voltage spikes. Even the voltage spike from a starter motor has been known to blow one of these Mitsubishi ECU’s.
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The Mitsubishi had a problem I could identify with – it just didn’t want to get up and running first thing in the morning. Once warmed up though it was fine, ran like a sewing machine. I have great admiration for the engineering of all Japanese cars – they seem to iron out their faults before they get onto the market place. Even allowing for the reduced proportion of Japanese vehicles we just don’t get much trouble with them. This Mitsubishi though had been back to the dealer on 3 occasions without success. The Mitsubishi’s problem was that it would idle at only 600 rpm from cold – so low that the engine would often stop completely. A cold running problem could be caused by a device that only operates when the engine is cold , or it may be something that is there all of the time but only evident with a cold engine. To find the fault in the first instance requires a cold engine, while the second instance requires diagnostic of a hot engine. It is important to check the engine out thoroughly first with a diagnostic, since otherwise a lot of tail chasing time can result. Initial diagnostics however in this instance did not uncover the cause of the fault so it we had to wait until the next day to check the cold running controls out. The fault was found to be due to poor wiring to the cold running idle speed control valve from the ECU, but due to this device not having worked at all for quite a while it was semi seized up and needed removing and un-seizing in an ultrasonic bath. Most definitely like me in the morning.
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Mitsubishi, all models 1993 - 2004 onwards
Emission Failures -
High CO & low lamna reading. common causes of rich running faults are the lamna sensor or the ECU (engine control unit) both of these parts are relatively simple to check, to check the sensor strip back the insulation on the signal wire from the lamna sensor, this wire is usually black. Then hold the bare wire between your finger and thumb then touch your other hand on to the battery positive the internal resistance of your body will give 1volt at your finger tips which is what the sensor would give out when the engine runs rich, if the emissions come down then you have a faulty lamna sensor or wiring but if the emissions remain the same then the ECU is a possible fault. For more information on ECU testing click on ECU
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