Electronic Powertrain Control Diagnostics
Overview of the 98+ ECM, PCM, JTEC, systems - Page 3

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The following table summarizes the various OBDII monitors operation.

OBD II MONITOR INFORMATION

(Some of the following monitors are for gasoline engines)
Comprehensive 
Components
Monitor
Major Monitors
Non Fuel Control
& Non Misfire
Major Monitors
Fuel Control
& Misfire
Run constantly Run Once Per Trip Run constantly
Includes AllEngine Hardware - Sensors, Switches, Sole- noids, etc.  Monitors Entire Emission System Monitors Entire System
One Trip Faults - Turns On The MIL and Sets DTC After One Failure Two Trip Faults - Turns On The Mill and Sets DTC After Two Consecutive Failures  Two Trip Faults - Turns On The Mill and Sets DTC After Two Consecutive Failures 
Priority 3
Priority 1 or 3
Priority 2 or 4
All Checked For
      Continuity Open       Short To Ground
      Short To Voltage 		Done Stop Testing = Yes

Oxygen Sensor Heater
Oxygen Sensor Response

Fuel Control Monitor 
Monitors Fuel Control System For: 
      Fuel System Lean
      Fuel System Rich
Requires 3 Consecutive Fuel System Good Trips To Extinguish The MIL
Inputs Checked For Rationality  .

Outputs Checked For Functionality 		 Catalytic Converter Efficiency Except EWMA
- up to 6 tests per trip and a one trip fault
EGR System 
Misfire Monitor
Monitors For Engine Misfire at:
   1000 RPM Counter
                  (Type B)
**200 RPM Counter
                  (Type A)

Requires 3 Consecutive GloballAlternate Good Trips to Extinguish the MIL *

**Type A misfire is a one trip failure. The MIL will illuminate and blink at the first failure.
Evaporative Emission System
(Purge and Leak)
Non-LDP or LDP
Requires 3 Consecutive GloballAlternate Good Trips to Extinguish the MIL * Requires 3 Consecutive GloballAlternate Good Trips to Extinguish the MIL *
*40 Warm Up Cycles are required to erase DTC's after the MIL has been extinguished.

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