ION Sense Ignition - Service Information

BULLETIN NUMBER:
IBOO-S001

ISSUE DATE:
JANUARY 2000

GROUP:
INFORMATION

ION SENSE IGNITION FOR MODEL YEAR 2000

AFFECTED VEHICLES

All Model Year 2000 Trooper, Rodeo, and Amigo with the V-6 Engine.

SERVICE INFORMATION

All Model Year 2000 Trooper, Rodeo, and Amigo with the V-6 engine have the new Ion Sense Ignition (ISI ) This ignition system is capable of electrically biasing the spark plug gap after the plug has fired to facilitate the monitoring of a "Combustion Event". In essence the spark plug now has become an "in-cylinder" combustion sensor. The system enables the PCM to perform three separate functions:

1. Cylinder Identification
2. Individual Cylinder Knock Detection
3. Individual Cylinder Misfire Detection

The Ion Sense Ignition system has eliminated the need for Knock and Cam Sensors. It has also eliminated the Rough Road input needed in the past for misfire detection. However, the technician should be aware of some specific service issues that can and cannot be performed while performing diagnostics and testing.

The Technician can:
^ Disconnect the coils for diagnostics.
^ Swap coils between cylinders 1-5 for diagnostics.
^ Measure the resistance at the three pin connector on the coil for diagnostics.
^ Disconnect the J-1 from the ISIM, turn the key to the on position, and crank the vehicle for diagnostics.

The Technician cannot:
^ Swap the coil from # 6 cylinder with any other cylinder. (The coil for # 6 cylinder is 3/16 of an inch shorter than the rest of the cylinders.)

^ Start the engine with the ISIM unbolted from the engine. If the ISIM is not grounded, it will internally short.

^ "Probe" the Sec A or Sec B lines. These lines have very high voltage.

^ Crank/start the engine with connector J-2 or J-3 disconnected from the ISIM.

^ Crank/start the engine without the coils bolted/grounded to the engine. The coils will become damaged.

^ Remove the secondary spring from the secondary boot.

^ Swap the ISIM's between the 3.2L and the 3.5L engines.

^ Apply grease to the ISIM connectors nor clean the ISIM connectors with any type of cleaning solvent. The connectors must be kept clean and free of all contaminates.

ION SENSE IGNITION SUMMARY




ION Sense Ignition Coil Connector




ION Sense Ignition Module

Below are some of the values of the Ion Sense Ignition Coil and Boot Assembly:





3-WAY CONNECTOR





RESISTANCE CHECKS





CONNECTOR J1 11-WAY





CONNECTOR J2 (Lt.GRAY)





CONNECTOR J2 (BLACK)

IMPORTANT:
The Ion Sense Ignition Module ground is provided through the mounting bolts. Never crank or run the engine without the module securely mounted.