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Electronic Control System Gas Plus Engines – FAULT CODE 454 – L Gas Plus and C Gas Plus engines with optional Sensor Supply Voltage Converter

Gas Mass Flow Sensor Circuit – Shorted Low.

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Overview

CODE REASON EFFECT
Fault Code: 454
PID: P183
SPN: 183
FMI: 4
LAMP: Amber
SRT: 

Gas Mass Flow Sensor Circuit – Shorted Low. Open circuit or short to ground detected on the sensor signal pin at the ECM.

Possible reduced performance.

Gas Mass Flow Sensor Circuit
SMALL | MEDIUM | LARGE

Circuit Description

The electronic control module (ECM) uses the gas mass flow sensor to measure fuel entering the engine and adjusts the fuel control valve based on this measurement.

Component Location

The gas mass flow sensor is located on the fuel housing. The sensor supply voltage converter is located between the engine harness and the gas mass flow sensor.

Shop Talk

Make sure that the screen located in the fuel housing is free from debris and oil.

When connecting and disconnecting electronic components, ensure that the keyswitch is
OFF unless otherwise specified in the procedure.

The voltage supply to the gas mass flow sensor passes through a voltage converter which maintains a minimum of +13.5-VDC to the sensor. The power for this converter is supplied by a switched battery source on the OEM 31 pin connector. This supply voltage
must be maintained above +8.0-VDC.

Cautions and Warnings

 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. Read the fault codes and verify engine options.  
  STEP 1A. Read the fault codes. Fault Code 454 active?
  STEP 1B. Check for sensor supply voltage converter. Voltage converter present?
STEP 2. Check the sensor and sensor supply voltage converter.  
  STEP 2A. Check system voltage. Voltage to specifications?
  STEP 2B. Inspect engine harness and sensor supply voltage converter harness connector pins. Dirty or damaged pins?
  STEP 2C. Check the sensor supply voltage converter supply voltage. Voltage between +8.0 and +15.0-VDC?
  STEP 2D. Check for a failed sensor supply voltage converter 2 Ampere fuse. Less than 10 Ohms?
  STEP 2E. Inspect the sensor supply voltage converter harness and gas mass flow sensor connector pins. Dirty or damaged pins?
  STEP 2F. Check the sensor supply voltage converter output voltage. Voltage between +14.73 and +15.73-VDC?
  STEP 2G. Check for an open circuit in the sensor supply voltage converter harness. Less than 10 Ohms?
  STEP 2H. Check the circuit response. Fault code 453 active and fault code 454 inactive?
  STEP 2I. Read the fault codes and verify sensor condition. Fault code 454 active?
STEP 3. Check the harnesses.  
  STEP 3A. Inspect the engine harness and, OEM harness and ECM connector pins. Dirty or damaged pins?
  STEP 3B. Check OEM 5 Ampere fuse. Less than 10 Ohms?
  STEP 3C. Check for an open circuit in the engine harness. Less than 10 Ohms?
  STEP 3D. Check for a pin-to-pin short in the engine harness. Greater than 100k Ohms?
  STEP 3E. Check for a pin short circuit to ground. Greater than 100k Ohms?
  STEP 3F. Check for an inactive fault code. Fault code 454 inactive?
STEP 4. Clear the fault codes.  
  STEP 4A. Disable the fault code. Fault Code 454 inactive?
  STEP 4B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Read the fault codes and verify engine options.

Guided Step 1A – Read the fault codes.

Conditions

  • Keyswitch ON
  • INSITE™ electronic service tool connected.

Action

Read the fault codes.

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

Fault Code 454 active?
YES NO
No Repair No Repair

Guided Step 1B – Check for sensor supply voltage converter.

Conditions

  • None

Action

Check for the presence of a sensor supply voltage converter.

  • Inspect the engine to confirm that it is an L Gas Plus or C Gas Plus with a sensor supply voltage converter.

Voltage converter present?
YES NO
No Repair No Repair

Refer to appropriate fault code for application.

Guided Step 2 – Check the sensor and sensor supply voltage converter.

Guided Step 2A – Check system voltage.

Conditions

  • Engine running.
  • INSITE™ electronic service tool connected.

Action

Check the supply voltage.

  • Use INSITE™ electronic service tool to read the Battery Voltage parameter.

Voltage range is +13.5 to +15.0-VDC.

Voltage to specifications?
YES NO
No Repair

Troubleshoot the vehicle’s charging system.

Guided Step 2B – Inspect engine harness and sensor supply voltage converter connector pins.

Conditions

  • Keyswtich OFF.
  • Sensor supply voltage converter disconnected from the engine harness.

Action

Inspect the engine harness and sensor supply voltage converter pins for the following:

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

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

For general inspection techniques, refer to Procedure 019-361 (Component Connector and Pin Inspection) in Section 19.

Dirty or damaged pins?
YES NO

A defective connection has been detected in the sensor supply voltage converter or harness connector.

Repair the damaged pins. If unable, replace the engine harness, or replace the sensor supply voltage converter, whichever has the damaged pins.

 No Repair

Guided Step 2C – Check sensor supply voltage converter supply voltage

Conditions

  • Sensor supply voltage converter disconnected from the engine harness.
  • Keyswitch ON.

Action

Check the supply voltage and return circuit.

  • Measure the voltage between the +12.0-VDC SUPPLY (Pin 1) and the sensor supply voltage converter GROUND (Pin 2) at the sensor supply voltage converter connector of the engine harness.

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

Voltage between +8.0 and +15.0-VDC?
YES NO
No Repair No Repair

Guided Step 2D – Check for a failed sensor supply voltage converter 2 Ampere fuse.

Conditions

  • Keyswitch OFF.
  • 2 Ampere fuse removed from sensor supply voltage converter harness.

Action

Check for a failed fuse.

  • Remove the 2 Ampere fuse from the inline fuse holder installed in the +12.0 VOLT supply line of the sensor supply voltage converter.
  • Use a multimeter to test the continuity of the 2 Ampere fuse.

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

For general resistance measurement techniques, refer to Procedure 019-360 (Resistance Measurements Using a Multimeter and Wiring Diagram) in Section 19.

Less than 10 Ohms?
YES NO

Replace the sensor supply voltage converter.
Refer to Procedure 019-439 (Sensor Supply Voltage Converter) in Section 19.

A failed fuse has been detected in the sensor supply voltage converter harness. Replace the fuse.

Guided Step 2E – Inspect the sensor supply voltage converter harness and gas mass flow sensor connector pins.

Conditions

  • Keyswitch OFF.
  • Sensor supply voltage converter connected to the engine harness.
  • Gas mass flow sensor disconnected from the sensor supply voltage converter harness.

Action

Check for a failed fuse.

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

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

For general inspection techniques, refer to Procedure 019-361 (Component Connector and Pin Inspection) in Section 19.

Dirty or damaged pins?
YES NO

A damaged connection has been detected in the sensor supply voltage converter harness or gas mass flow sensor connector.

Repair the damaged pins. If unable, replace the sensor supply voltage converter or the gas mass flow sensor, whichever has the damaged pins.

 No Repair

Guided Step 2F – Check sensor supply voltage converter output voltage.

Conditions

  • Sensor supply voltage converter connected to the engine harness.
  • Sensor supply voltage converter disconnected from the gas mass flow sensor.
  • A 40 Ohm, 10 Watt resistor inserted across the gas mass flow sensor connector supply and return pins.
  • Keyswtich ON.

Action

Check the supply voltage and return circuit.

Voltage between +14.73 and +15.73-VDC?
YES NO
No Repair

Repair or replace the sensor supply voltage converter.

Refer to Procedure 019-439 (Sensor Supply Voltage Converter) in Section 19.

Guided Step 2G – Check for an open circuit in the sensor supply voltage converter harness.

Conditions

  • Keyswitch OFF
  • Engine harness disconnected from the sensor supply voltage converter
  • Gas mass flow sensor disconnected from the sensor supply voltage converter.

Action

Check for an open circuit.

  • Measure the resistance between the sensor supply voltage converter Gas Mass Flow Sensor connector SIGNAL pin and the sensor supply voltage converter Engine Harness connector SIGNAL pin.
  • Measure the resistance between the sensor supply voltage converter Gas Mass Flow Sensor connector RETURN pin and the sensor supply voltage converter Engine Harness connector RETURN pin.

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

For general resistance measurement techniques, refer to Procedure 019-360 (Resistance Measurements Using a Multimeter and Wiring Diagram) in Section 19.

Less than 10 Ohms?
YES NO
No Repair

An open circuit has been detected in the sensor supply voltage converter.

Guided Step 2H – Check the circuit response.

Conditions

  • Gas mass flow sensor disconnected from the sensor supply voltage converter harness.
  • Keyswitch ON.
  • INSITE™ electronic service tool connected.

Action

Check for the appropriate circuit response after 30 seconds.

  • Place a jumper wire between the gas mass flow SUPPLY Pin and the gas mass flow SIGNAL pin at the gas mass flow sensor connector of the sensor supply voltage converter harness.
  • Use INSITE™ electronic service tool to read the fault codes.

Fault code 453 active and fault code 454 inactive?
YES NO
No Repair

An open circuit has been detected in the sensor supply voltage converter.

Guided Step 2I – Read fault codes and verify sensor condition.

Conditions

  • Gas mass flow sensor connected to the engine harness.
  • Keyswitch ON.
  • INSITE™ electronic service tool connected.

Action

Read the fault codes.

  • Start the engine and let it idle for 1 minute.
  • Use INSITE™ electronic service tool to read the fault codes.

Fault code 454 active?
YES NO

Replace the gas mass flow sensor.
Refer to procedure 019-101 (Gas Mas Flow Sensor) in Section 19.

No Repair

Guided Step 3 – Check the harnesses.

Guided Step 3A – Inspect the engine harness, OEM harness and ECM connector pins.

Conditions

  • Keyswitch OFF.
  • Engine harness connector 1 disconnected from the ECM.
  • Engine harness disconnected from the OEM harness at the 23-pin and the 31-pin OEM connectors.

Action

Inspect the engine hanress, OEM harness and ECM connector pins for the following:

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

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

For general inspection techniques, refer to Procedure 019-361 (Component Connector and Pin Inspection) in Section 19.

Dirty or damaged pins?
YES NO

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

 No Repair

Guided Step 3B – Check for a failed OEM 5 Ampere fuse.

Conditions

  • Keyswitch OFF
  • OEM 5 Ampere fuse removed.

Action

Check for a failed fuse.

  • Remove the 5 Ampere fuse installed in the +12.0 Volt Supply between OEM connector Pin 31 and the +12.0 Volt switched battery source.
  • Use a multimeter to test the continuity of the 5 Ampere fuse.

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

For general resistance measurement techniques, refer to Procedure 019-360 (Resistance Measurements Using a Multimeter and Wiring Diagram) in Section 19.

Less than 10 Ohms?
YES NO
No Repair

A failed fuse has been detected. Replace the fuse.

Guided Step 3C – Check for an open circuit in the engine harness.

Conditions

  • Keyswitch OFF.
  • Engine harness disconnected from the ECM.
  • Sensor supply voltage converter disconnected from the engine harness.

Action

Check for an open circuit.

  • Measure the resistance between the engine harness ECM connector 1 SUPPLY pin and the engine harness sensor supply voltage converter connector SUPPLY pin.
  • Measure the resistance between the engine harness ECM connector 1 SIGNAL pin and the engine harness sensor supply voltage converter connector SIGNAL pin.

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

For general resistance measurement techniques, refer to the Procedure 019-360 (Resistance Measurements Using a Multimeter and Wiring Diagram) in Section 19.

Less than 10 Ohms?
YES NO
No Repair

Repair or replace the engine harness.

Guided Step 3D – Check for a pin-to-pin short circuit in the engine harness.

Conditions

  • Keyswitch OFF.
  • Engine harness disconnected from the ECM.
  • Gas mass flow sensor disconnected from the engine harness.

Action

Check for a pin-to-pin short circuit.

  • Measure the resistance between the gas mass flow SIGNAL pin in the engine harness ECM connector 1 and all other pins in connector 1.
  • Measure the resistance between the gas mass flow sensor SIGNAL pin in the engine harness connector 1 and all other pins in connector 2.

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

For general resistance measurement techniques, refer to Procedure 019-360 (Resistance Measurements Using a Multimeter and Wiring Diagram) in Section 19.

Greater than 100k ohms?
YES NO
No Repair

Repair or replace the engine harness connector or pins.

Guided Step 3E – Check for a pin short circuit to ground.

Conditions

  • Keyswitch OFF.
  • Engine harness disconnected from the ECM.

Action

Check for a pin short circuit to ground.

  • Measure the resistance between the gas mass flow sensor SIGNAL pin in the engine harness ECM connector 1 and ground.

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

For general resistance measurement techniques, refer to Procedure 019-360 (Resistance Measurements Using a Multimeter and Wiring Diagram) in Section 19.

Greater than 100k Ohms?
YES NO
No Repair

Repair or replace the engine harness connector or pins.

Guided Step 3F – Check for an inactive fault code.

Conditions

  • All components connected.
  • Keyswitch ON.
  • INSITE™ electronic service tool connected.

Action

Check for appropriate circuit response after 30 seconds.

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

Fault code 454 inactive?
YES NO
No Repair

Guided Step 4 – Clear the fault codes.

Guided Step 4A – Disable the fault code.

Conditions

  • All components connected.
  • Keyswitch ON.
  • INSITE™ electronic service tool connected.

Action

Disable the fault code.

  • Start the engine and let it idle for 1 minute.
  • Use INSITE™ electronic service tool to verify that Fault Code 454 is inactive.

Fault Code 454 inactive?
YES NO
No Repair No Repair

Guided Step 4B – Clear the inactive fault codes.

Conditions

  • All components connected.
  • Keyswitch ON.
  • INSITE™ electronic service tool connected.

Action

Clear the inactive fault codes.

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

All fault codes cleared?
YES NO
No Repair

Troubleshoot any remaining active fault codes.
Repair complete
Appropriate troubleshooting charts.
Last Modified:  17-Mar-2008
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