Ignition System - Mitsubishi Electronic Dodge Ram I

DESCRIPTION

Mitsubishi breakerless ignition consists of an ignitor, ignition coil, pick-up coil and distributor. The control module is mounted inside the distributor with the pick-up coil assembly.

Chrysler Motors models with turbocharged engines are equipped with Electronically Controlled Injection (ECI) system, which controls fuel injection and ignition timing retard.

OPERATION

Whenever ignition is on, ignition coil primary circuit is energized. As distributor shaft rotates, the reluctor rotates inside the stator assembly.

As armature teeth pass the pegs of the pick-up coil, a signal is sent to the ignitor. The ignitor then breaks the primary circuit in the coil. This causes a high voltage surge in the coil secondary circuit. This high voltage is required to fire the spark plugs.

Mitsubishi Electronic Ignition System With Internal Control Module. Scheme 1

RELUCTOR-TO-PICK-UP COIL AIR GAP

Align reluctor teeth with pegs of pick-up coil and breaker plate assembly. Using a feeler gauge, check for correct air gap. To adjust, loosen set screws and move pick-up coil.

PICK-UP COIL AIR GAP

TESTING

Note. Ensure battery is fully charged and in good condition before making any tests. Check all wiring, ignition switch, coil, spark plug cables and connectors.

HIGH VOLTAGE TEST

Connect a remote starter switch in starting circuit. Remove coil wire from distributor cap. Turn ignition on and hold coil wire 1/4" from cylinder block. Crank engine. If no spark or only a weak spark results, perform following tests.

SECONDARY WIRE RESISTANCE TEST

1. Test coil and spark plug cables with an ohmmeter. Do not puncture secondary wires when making resistance check. Connect leads to each end of cable.
2. Resistance for Mitsubishi should not exceed 16,000 ohms for each 39" (1 m). For Chrysler Motors vehicles, resistance should not exceed 22,000 ohms per cable.

IGNITION COIL RESISTANCE TEST

1. Turn ignition off. Remove wires from coil primary terminals to isolate it from the rest of the system. Set an ohmmeter to the low scale, and attach the leads to the coil positive and negative terminals. Check primary resistance reading.
2. Set ohmmeter to x1000 scale. Attach leads to coil positive terminal and secondary tower. Check secondary resistance reading.

Installing Driven Gear on Distributor Shaft Align marks and install new roll pin. Scheme 2

Exploded View of Distributor Used With 1.5L, 2.0L & 2.4L Engines. Scheme 3

Exploded View of Distributor Used With 1.6L & 2.6L Engines Note location of governor springs for reassembly. Scheme 4

IGNITION COIL SPECIFICATIONS

IGNITION COIL RESISTANCE SPECIFICATIONS (OHMS)

MAGNETIC PICK-UP COIL RESISTANCE TEST

Turn ignition off. Set ohmmeter to x100 scale. Attach leads to pick-up coil's distributor connector terminals. (Scheme 5) Compare resistance readings obtained with table. See PICK-UP COIL RESISTANCE table.

Checking Pick-Up Coil Resistance Attach ohmmeter leads to points shown. Scheme 5

PICK-UP COIL RESISTANCE

Chrysler Motors (Except Turbo)

Connect ignitor, test light and battery. (Scheme 6) Using a dry cell battery or continuity tester, apply voltage to signal input terminal of ignitor unit. Test light should light when voltage is applied, and go out when voltage is removed. If not, ignitor is bad.

Note. This test can only determine when ignitor is bad. Even if ignitor tests good, it could still be defective.

Checking Ignitor With Battery & Test Light Use low-voltage dry cell battery or ohmmeter. Scheme 6

Chrysler Motors (Turbo Models)

1. Warm engine to normal operating temperature. Connect a timing light and set to specification. Check centrifugal spark advance and repair if necessary. Set engine to 1000 RPM.
2. Using a hammer, lightly tap injector mixer mounting stud. Check to see if spark retards. If not, go to next step. If so, measure voltage between ignitor terminal No. 6 and ground. If there is one volt or less, repair or replace pressure sensor and/or shorted wiring harness. If more than one volt is present, replace defective ESC ignitor.
3. Disconnect pressure sensor connector. Check to see if spark timing retards. If not, go to next step. If spark retards, check detonation shielding wire for continuity. If okay, detonation sensor or ESC ignitor is defective. If not, repair or replace shielding harness.
4. Using a hammer, lightly tap injector mixer mounting stud. Check to see if spark timing retards. If not, replace ESC ignitor or detonation sensor. If spark retards, disconnect detonation sensor connector.
5. Check for spark timing retarding 8 degrees. If not, ESC ignitor is defective. If so, ESC ignitor is okay. Reconnect wiring.