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Electronic Control System Gas Plus Engines – FAULT CODE 454 – B Gas Plus, and C Gas Plus engines without 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 to adjust the fuel control valve based on this measurement.

Component Location

The gas mass flow sensor is located on the fuel housing.

Shop Talk

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

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

The voltage supply for the C Gas Plus engine must be maintained at or above +13.5-VDC for proper sensor operation. On the B Gas Plus and B LPG engines the voltage must be maintained above +12.0-VDC for proper sensor operation. This can be monitored in the INSITE™ electronic service tool use the 14 Volt Sensor Supply parameter (3).

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.  
  STEP 2A. Check system voltage. Voltage between +13.5 and +15.0-VDC?
  STEP 2B. Check sensor supply voltage. Voltage between +13.5 and +15.0-VDC?
  STEP 2C. Check the circuit response. Fault code 454 inactive and fault code 453 active?
  STEP 2D. Read the fault codes and verify sensor condition. Fault code 454 active?
STEP 3. Check the harnesses.  
  STEP 3A. Inspect the engine harness and gas mass flow sensor connector pins. Dirty or damaged pins?
  STEP 3B. Inspect the engine harness, OEM harness and ECM connector pins. Dirty or damaged pins?
  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 not 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.

Guided Step 2A – Check system voltage.

Conditions

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

Action

Check system 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 – Check sensor supply voltage.

Conditions

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

Action

Check the sensor supply voltage.

  • Use INSITE™ electronic service tool to read the 14 Volt Sensor Supply (3) parameter.

Voltage should be between +13.5 and +15.0 VDC.

Voltage to specifications?
YES NO
No Repair No Repair

Guided Step 2C – Check the circuit response.

Conditions

  • Gas mass flow sensor disconnected from the engine 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 engine harness.
  • Use INSITE™ electronic service tool to read the fault codes.

Fault Code 453 active and Fault Code 454 inactive?
YES NO
No Repair No Repair

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

Conditions

  • Gas mass flow sensor connected to the engine harness.
  • Turn 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 Mass Flow Sensor) in Section 19.

No Repair

Guided Step 3 – Check the engine harness.

Guided Step 3A – Inspect the engine harness and gas mass flow sensor connector pins.

Conditions

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

Action

Inspect the engine harness and gas mass flow sensor 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 – 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 harness, 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 3C – Check for an open 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 an open circuit.

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

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.
  • Engine harness disconnected from the OEM harness at the 23-pin and the 31-pin OEM connectors.
  • 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 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.
  • Gas mass flow sensor disconnected from the engine harness.

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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