Autopapyrus · Mitsubishi Challenger 3.0 6G72 (1996)
https://autopapyrus.com/guides/mitsubishi/challenger/engine-control-unit-connector-reference/
https://autopapyrus.com/guides/mitsubishi/challenger/engine-control-unit-connector-reference/
Compiled automatically from service literature and owner experience. Specs are for the typical configuration — check them against your exact car before you start.
Mitsubishi Challenger 3.0 6G72 (1996): Engine Control Unit Connector Reference
An exact table of "pin number - function - wire color" for the 1996 Challenger with the 6G72 is not confirmed in open sources, so I will not make up pin numbers. Below you will find the location of the unit, the groups of circuits wired to its connectors, and a safe procedure for identifying and testing each pin on your specific vehicle.
Parts
3| № | Part |
|---|---|
| 01 | Replacement engine control unit connector (housing with wires and terminals) for Mitsubishi Challenger 6G72 |
| 02 | Terminals for repairing sensor connectors |
| 03 | Engine control unit (ECU) 6G72if the unit itself is faulty; same trim and transmission type |
Tools
6- multimeter
- set of thin probes or pins for back-probing
- screwdriver
- 10 mm wrench
- flashlight
- battery charger or memory-saver jumper for use while the battery is disconnected
Step by step
10 steps- Unit location. On the Challenger and the similar Pajero, the engine control unit is mounted inside the cabin, in the area of the right front footwell or under the dash on the passenger side, behind a trim panel. Remove the side trim, remove the fasteners (usually 2-3 screws or 10 mm nuts), and move the unit aside. The connectors are large, multi-pin, with a locking lever or bracket. The unit may have one or two connector housings. The pin numbering is marked on the plastic of the housing but is hard to read, so use a magnifying glass.
- Preparation. Turn the ignition off and disconnect the negative battery terminal for at least 1-2 minutes. Keep in mind that the learned adaptations and stored codes will be erased. Disconnect the connector only with the ignition off, otherwise the unit may be damaged.
- Power group. The connector has these circuits: constant battery positive (memory), positive after the main relay of the injection system, and positive from the ignition switch (IG signal). Test: with a probe on the pin of the harness-side connector (not the unit), you should see battery voltage in the corresponding mode (constantly, or after switching the ignition on).
- Ground group. There are several ground pins: the unit's power ground and the sensor ground (a common "clean" ground). Check continuity to the body or the battery negative: resistance should be no more than a fraction of an ohm. A bad ground causes a fluctuating idle, strange fault codes and misfires.
- Actuator group. The unit controls the circuits of the six fuel injectors (one per cylinder), the ignition coil power stage, the idle speed control (stepper motor or ISC valve), the fuel pump relay, the EGR and evaporative emission (EVAP) purge solenoid valves, and the A/C and cooling fan relays. It is easiest to identify the needed circuit starting from the component: disconnect the injector connector and check continuity of the wire from it to the unit's connector.
- Sensor group. Inputs: the mass airflow sensor (on these Mitsubishi engines usually a Karman vortex type), the throttle position sensor (5 V supply, ground, signal), the engine coolant temperature sensor, the intake air temperature sensor, the crankshaft and camshaft position sensors, the oxygen sensor(s), the knock sensor, the vehicle speed sensor, signals from the A/C, the neutral switch or automatic transmission, and the power steering. The 5 V sensor reference voltage is checked with the ignition on, between the sensor's supply pin and its ground.
- Diagnostic connector. To read codes, use the diagnostic connector under the dash on the left, on the driver's side (the format depends on the trim: the older 12-pin or the later 16-pin, so check against the appearance of your connector). Codes can be read with a scan tool that supports the Mitsubishi protocol, or by the blinking of the indicator light when the diagnostic pin is grounded, following the procedure for your connector.
- How to identify a pin without a diagram. Choose the sensor you need, disconnect its connector, and determine the wires by function: supply, ground, signal. Then, with the unit disconnected, check continuity from each wire to the unit's connector, and write down the pin number from the marking on the connector plastic. This gives you a reliable table for your vehicle.
- Connector inspection. Check the terminals for oxidation, loose retainers, burnt plastic and signs of moisture. A contact can be tightened by bending the terminal tab slightly, and oxidized spots can be cleaned with contact cleaner. Do not push multimeter probes into the unit's sockets: this stretches the terminals and causes intermittent faults. Probe from the wire side or use thin needle probes from the back of the connector.
- Reassembly. Install the connector until the lock clicks, secure the unit, refit the trim panels, reconnect the battery, warm up the engine, and check that the idle is stable and the Check Engine light stays off.
Common mistakes and warnings
- Do not apply voltage to the unit's pins and do not short them "to test": you can burn out the output drivers
- Do not check injector and sensor circuits with an ohmmeter while the unit is connected
- Verify exact pin numbers and wire colors against the markings on the connector itself and by continuity testing, since trims (market, transmission type, presence of a catalytic converter) differ in wiring