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Electronic Control System Gas Plus Engines – FAULT CODE 2219

Heated Oxygen Sensor Circuit – Failed In-Range High

Overview

CODE REASON EFFECT
Fault Code: 2219
PID: S65
SPN: 724
FMI: 0/16
LAMP: Amber
SRT: 

Heated Oxygen Sensor Circuit – Failed In-Range High The measured air-to-fuel ratio is greater than the desired calculated air-to-fuel ratio.

Possible reduced performance. No closed loop operation.

Heated Oxygen Sensor Circuit

SMALL | MEDIUM | LARGE

Circuit Description

The electronic service tool (ECM) uses this sensor to determine the composition of the exhaust gas and then, to adjust fueling.

Component Location

The heated oxygen sensor is located in the exhaust outlet connection, after the turbocharger.

Shop Talk

The heated oxygen sensor measures the partial pressure of oxygen present in the exhaust gas. It measures this oxygen presence in lambda (L). The air-to-fuel ratio (stoichiometric) is 1L :16.5. The approximate lean-burn condition for the engine is 1.4.

The ECM will read an in-range high fault if the engine is running lean or the heated oxygen sensor or heated oxygen sensor circuit has failed. An exhaust leak can cause this fault by not providing enough back pressure to the heated oxygen sensor. Also, If there are any intake leaks after the throttle actuator the engine can also run lean due to low fuel pressure problems which can cause this fault to activate. If this troubleshooting tree does not fix the problem, the ECM can be the fault.

Cautions and Warnings

 WARNING 

Do not touch the heated oxygen sensor until it has cooled. The heated oxygen sensor operates at high temperature and can cause personal injury.
 CAUTION 

Do not use any lubricant in the heated oxygen sensor connector. The sensor will not perform correctly with any grease in the connector.
 CAUTION 

To reduce the possibility of damaging a new ECM, all other active fault codes must be investigated prior to replacing the ECM.
 CAUTION 

To reduce the possibility of pin and harness damage, use the following test lead when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the fault codes.  
  STEP 1A. Check for fault codes. Fault Code 752 active?
  STEP 1B. Check for an inactive fault code. Fault Code 2219 inactive?
STEP 2. Check the engine harness and heated oxygen sensor.  
  STEP 2A. Inspect the engine harness and heated oxygen sensor connector pins. Dirty or damaged pins?
  STEP 2B. Check for an open circuit in the engine harness. Less than 10 ohms?
  STEP 2C. Check for a pin to pin short circuit in the engine harness. Greater than 100k ohms?
  STEP 2D. Check for an inactive fault code. Fault Code 2219 inactive?
STEP 3. Check the fuel pressure.  
  STEP 3A. Verify secondary fuel pressure. Is pressure correct for the engine family?
  STEP 3B. Check for a stuck open fuel control valve. Secondary fuel pressure drop within 50 seconds of key on?
  STEP 3C. Gas mass flow compensation is correct. Is the gas flow compensation a positive 25 or higher?
STEP 4. Check the intake and exhaust system  
  STEP 4A. Check the intake and exhaust system for air leaks. Air leaks?
  STEP 4B. Check for an inactive fault code. Fault Code 2219 inactive?
STEP 5. Clear the fault codes.  
  STEP 5A. Disable the fault code. Fault Code 2219 inactive?
  STEP 5B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Check the fault codes.

Guided Step 1A – Check for fault codes.

Conditions

  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 752 active?
YES NO
No Repair No Repair
Fault Code 752

Guided Step 1B – Check for an inactive fault code.

Conditions

  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 2219 inactive?
YES NO
No Repair No Repair

Guided Step 2 – Check the engine harness and heated oxygen sensor.

Guided Step 2A – Inspect the engine harness and heated oxygen sensor connector pins.

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness connector 2 from the ECM.
  • Disconnect the heated oxygen sensor from the engine harness.

Action

  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Wire insulation damage
  • Moisture in or on the connector
  • Missing or damaged connector seals
  • Connector shell broken
  • Dirt or debris in or on the connector pins.

Refer to the circuit diagram or wiring diagram for connector pin identification.

For general inspection techniques, refer to Component Connector and Pin Inspection, Procedure 019-361.

Dirty or damaged pins?
YES NO

A defective connection has been detected in the ECM, engine harness or heated oxygen sensor connector.

Repair the damaged pins. Repair or replace the engine harness, or replace the sensor, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the harness. Refer to Procedure 019-204.
  • Replace the harness. Refer to Procedure 019-043.
  • Replace the Heated Oxygen Sensor. Refer to Procedure 019-100.
 No Repair

Guided Step 2B – Check for an open circuit in the engine harness.

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness connector 2 from the ECM
  • Disconnect the heated oxygen sensor from the engine harness.

Action

  • Measure the resistance between the engine harness ECM connector 2 heated oxygen sensor adjustment current pin and the engine harness heated oxygen sensor connector adjustment current pin.
  • Measure the resistance between the engine harness ECM connector 2 heated oxygen sensor SIGNAL pin and the engine harness heated oxygen sensor connector SIGNAL pin.
  • Measure the resistance between the engine harness ECM connector 2 heated oxygen sensor RETURN pin and the engine harness heated oxygen sensor connector RETURN pin.

Refer to the circuit diagram or wiring diagram for connector pin identification.

For general resistance measurement techniques, refer to Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360

Less than 10 ohms?
YES NO
No Repair

An open adjustment current, SIGNAL or RETURN circuit has been detected in the engine harness.

Repair the damaged pins. Repair or replace the engine harness, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the engine harness. Refer to Procedure 019-204.
  • Replace the engine harness. Refer to Procedure 019-043.

Guided Step 2C – Check for a pin to pin short circuit in the engine harness.

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness connector 1 and connector 2 from the ECM
  • Disconnect the heated oxygen sensor from the engine harness.

Action

  • Measure the resistance between the heated oxygen sensor adjustment current pin in the engine harness ECM connector 2 and all other pins in the ECM connector 2
  • Measure the resistance between the heated oxygen sensor adjustment current pin in the engine harness ECM connector 2 and all other pins in the ECM connector 1
  • Measure the resistance between the heated oxygen sensor SIGNAL pin in the engine harness ECM connector 2 and all other pins in the ECM connector 2.
  • Measure the resistance between the heated oxygen sensor SIGNAL pin in the engine harness ECM connector 2 and all other pins in the ECM connector 1.

Refer to the circuit diagram or wiring diagram for connector pin identification.

For general resistance measurement techniques, refer to Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360

Greater than 100k ohms?
YES NO
No Repair

A pin to pin short circuit on the signal line or adjustment current line has been detected in the engine harness.

Repair the damaged pins. Repair or replace the engine harness, whichever has the damaged pins.

  • Flush the dirt, debris, or moisture from the connector pins using electronic contact cleaner, Part Number 3824510.
  • Install the appropriate connector seal if it is damaged or missing.
  • Repair the engine harness. Refer to Procedure 019-204.
  • Replace the engine harness. Refer to Procedure 019-043.

Guided Step 2D – Check for an inactive fault code.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 2219 inactive?
YES NO
No Repair No Repair

Guided Step 3 – Check the fuel pressure.

Guided Step 3A – Verify secondary fuel pressure.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to monitor the fuel pressure.
  • Minimum secondary fuel pressures are different depending on engine platform. See values below:

B Gas Plus – 60 psia

B LPG Plus – 40 psia

C and L Gas Plus – 75 psia

  • Note: All pressure sensors on Gas Plus engines are absolute pressure sensors.

Is pressure correct of the engine family?
YES NO
No Repair

For more troubleshooting details on low fuel pressure issues, go to Fault Code 2119.

Guided Step 3B – Check for a stuck open fuel control valve.

Conditions

  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to monitor the secondary fuel pressure while the keyswitch is on.

Note: If the fuel control valve is stuck open, raw fuel will be dumped into the engine and out the exhaust. This will cause the heated oxygen sensor to read a lower than actual air oxygen value.

Secondary fuel pressure drop within 50 seconds of key on?
YES NO

A defective fuel control valve has been detected.

Replace the fuel control valve. Refer to Procedure 019-102.

Use INSITE™ electronic service tool to reset the fuel tables.

 No Repair

Guided Step 3C – Gas mas flow compensation is correct.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool
  • Run engine at stall conditions.

Action

  • Use INSITE™ electronic service tool to monitor the gas mass flow compensation.

Note: Oil contamination of the gas mass flow sensor will cause a low flow reading and over compensate for fuel flow. If the engine is running rich and Fault Code 2219 is active, the gas mass flow sensor must be inspected. Check the fuel filter for excess oil due to improper maintenance. If there is more than one ounce of oil in the fuel filter, than there is a possibility that oil has contaminated the fuel system. The customer must check their gas compression station for oil carry over.

Is the gas flow compensation a positive 25 or higher?
YES NO

Replace the gas mass flow sensor. Refer to Procedure 019-101.

Use INSITE™ electronic service tool to reset the fuel tables.

 No Repair

Guided Step 4 – Check for intake and exhaust systems.

Guided Step 4A – Check the intake and exhaust system for air leaks.

Conditions

  • Turn keyswitch OFF.

Action

  • Refer to Procedure 010-024 in the Troubleshooting and Repair Manual C8.3G, C Gas Plus and L Gas Plus Engines, Bulletin 3666206 and Procedure 010-024 in the Troubleshooting and Repair Manual B5.9G, B5.9 LPG, B Gas Plus and B LPG Plus Engines, Bulletin 3666164.

Air Leaks?
YES NO

Follow the troubleshooting steps in Procedure 010-024 in the Troubleshooting and Repair Manual C8.3G, C Gas Plus and L Gas Plus Engines, Bulletin 3666206 and Procedure 010-024 in the Troubleshooting and Repair Manual B5.9G, B5.9 LPG, B Gas Plus and B LPG Plus Engines, Bulletin 3666164.

 No Repair

Guided Step 4B – Check for an inactive fault code.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 2219 inactive?
YES NO
No Repair

Replace the heated oxygen sensor. Refer to Procedure 019-100.

Use INSITE™ electronic service tool to reset.

Guided Step 5 – Clear the fault codes.

Guided Step 5A – Disable the fault code.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Start the engine and let it idle for one minute.
  • Use INSITE™ electronic service tool to verify that the fault code is inactive.

Fault Code 2219 inactive?
YES NO
No Repair No Repair

Guided Step 5B – Clear the inactive fault codes.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Use INSITE™ electronic service tool to erase the inactive fault codes.

All fault codes cleared?
YES NO
No Repair No Repair
Repair complete
Appropriate troubleshooting charts
Last Modified:  14-Sep-2004
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