Trouble Codes

How trouble codes are stored

The VR4 ECU only stores diagnostic trouble codes as per the list supplied on this page.. No other information such as when the code occurred is stored, nor the values of related sensors at the time of the code.

Obtaining Diagnostic Codes

Generally you will only wish to obtain diagnostic codes on the VR4 when the Check Engine Light (CEL) is illuminated. You can obtain these codes just by bridging pins, or using a diagnostic tool.

Obtaining Trouble Codes without any tools

You can obtain any stored diagnostic codes without any additional tools, simply by bridging some pins of the diagnostic connector, with a paper clip or piece of wire.

1. Ensure that the engine is not running but that the Ignition is in the "ON" position. This is also known as Key On Engine Off (KOEO)
2. Bridge pins 1 and 4 of the diagnostic connector

The diagnostic connector is located under the dashboard, just forward of the driver's left knee. It is facing down towards the floor and is accessible without removing any panels

Diagnostic connector shape and pinout (J1962)

Once you have done the above steps, the dashboard will illuminate the Check Engine Light, the Neutral light for the auto transmission (if your car is auto), and the ABS, TCL and ASC lights and these lights will begin to flash if there is a stored code for the relevant system (ECU, ABS, AYC, etc). The lights will flash in the following sequence:

• Long flash - first digit of the fault code
• Short flash - second digit of the fault code
• Long delay between flashes - delay between previous and next stored code
  • If the next code is the same as the last code, you only have one stored error code

Using a Diagnostic tool to collect Trouble Codes

Mitsubishi uses non-standard protocols for communications, therefore OBD-2 diagnostic tools will not work. You can only use EvoScan with an FTDI VAGCOM cable, OpenPort 1.3 or OpenPort 2.0 cable, or a genuine Mitsubishi MUT tool. Evoscan achieves the same result as a MUT, but its accuracy of reporting and translating Trouble Codes can be inconsistent, especially if the ROM has been customised.

Engine Codes

Engine Codes

Code	Affected System	Possible Issues	Triggers CEL?	Symptoms	Driveability Impact
12	Air Flow Sensor System	Mass Air Flow (MAF) sensor disconnected or faulty	YES	Reduced power, poor throttle response, stalling	Engine will run but with reduced power and likely rough
13	Inlet temperature Sensor System	Mass Air Flow (MAF) disconnected, or IAT sensor faulty	YES	Lower power, higher fuel consumption	Engine will run but with reduced power
14	Throttle Position Sensor System	Disconnected or broken TPS	YES	Engine sluggish to respond to changes in throttle position	Engine will rely on MAF to operate but will drive
21	Temperature Sensor System	Disconnected or faulty Engine Coolant Temperature (ECT) sensor	YES	High fuel consumption, low power	Engine will run but will run very rich and with low power.
22	Crank Angle Sensor System	Disconnected or faulty crank position sensor	YES	Engine will not start	Engine will not start
23	Cam Position (TDC) Sensor	Disconnected or broken Cam position sensor	YES	Engine will not start	Engine will not start
24	Speed Sensor System	Broken speedo drive in gearbox		No speedometer readout	None
25	Atmospheric Pressure Sensor System
31	Knock Sensor System	Faulty connection to the knock sensor		Rich running	High fuel consumption Reduced Power
41	Injectors System
42	Fuel Pump Relay
44	Ignition Coil, Systematic Power Transistor Unit -- (No.1 - No.4-cylinder)	Faulty coil primary winding for cylinders 1 and 4	YES	Rough running	Low power High vibration
52	Ignition Coil, Systematic Power Transistor Unit -- (No.2 - No.5-cylinder)	Faulty coil primary winding for cylinders 2 and 5	YES	Rough running	Low power High vibration
53	Ignition Coil, Systematic Power Transistor Unit -- (No.3 - No.6-cylinder)	Faulty coil primary winding for cylinders 3 and 6	YES	Rough running	Low power High vibration
61	A / T-ECU And Communication Lines (Torque Reduction Request Signal Line) System
64	FR Alternator System Terminal
71	Vacuum Control Solenoid Valve System
72	Ventilation Control Solenoid Valve System
1A	No.1 cylinder accidental fire detection
1B	No.2 cylinder accidental fire detection
1C	No.3 cylinder accidental fire detection
1D	No.4 cylinder accidental fire detection
1E	No.5 cylinder accidental fire detection
1F	No.6 cylinder accidental fire detection
2C	Multicylinder accidental fire detection