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Electronic Control System Gas Plus Engines – FAULT CODE 453 – B and C Gas Plus

Gas Mass Flow Sensor Circuit – Shorted High

Overview

CODE REASON EFFECT
Fault Code: 453
PID: P183
SPN: 183
FMI: 3
LAMP: Amber
SRT: 

Gas Mass Flow Sensor Circuit – Shorted High. High voltage 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 into 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 that the screen located in the fuel housing is free from debris and oil.

The voltage supply for the C series engine must be maintained at or above 13.5 VDC for proper sensor operation. On the B series engine the voltage must be maintained above 12 VDC for proper sensor operation. This can be monitored in the INSITE™ electronic service tool with parameter sensor supply 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. Check the fault codes.  
  STEP 1A. Read the fault codes. Fault Code 453 active?
STEP 2. Check the sensor.  
  STEP 2A. Inspect the engine harness and gas mass flow sensor connector pins. Dirty or damaged pins?
  STEP 2B. Check for circuit response. Fault Code 454 active and Fault Code 453 inactive?
  STEP 2C. Check the sensor supply voltage and return circuit. Voltage to specifications?
  STEP 2D. Read the fault codes. Fault Code 453 active?
STEP 3. Check the engine harness.  
  STEP 3A. Inspect the engine harness, OEM harness, and ECM connector pins. Dirty or damaged pins?
  STEP 3B. Check for an open circuit in the engine harness. Less than 10 ohms?
  STEP 3C. Check for a pin to pin short circuit in the engine harness. Greater than 100k ohms?
  STEP 3C-1. Check for a pin to pin short circuit in the engine harness.
  STEP 3D. Read the fault codes. Fault Code 453 active?
STEP 4. Clear the fault codes.  
  STEP 4A. Disable the fault code. Fault Code 453 inactive?
  STEP 4B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Check the fault codes.

Guided Step 1A – Read the fault codes.

Conditions

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

Action

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

Fault Code 453 active?
YES NO
No Repair No Repair

Guided Step 2 – Check the sensor.

Guided Step 2 – Inspect the engine harness and gas mass flow sensor connector pins.

Conditions

  • Turn keyswitch OFF
  • Disconnect the gas mass flow 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 component pin identification.

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

Dirty or damaged pins?
YES NO

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 engine harness. Refer to Procedure 019-220.
  • Replace the engine harness. Refer to Procedure 019-043.
  • Replace the sensor. Refer to Procedure 019-101.
 No Repair

Guided Step 2B – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the gas mass flow sensor from the engine harness
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

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

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

Guided Step 2C – Check the sensor supply voltage and return circuit.

Conditions

  • Turn keyswitch OFF
  • Disconnect the gas mass flow sensor from the engine harness
  • Turn keyswitch ON

Action

  • Measure the voltage between the 12 VDC SUPPLY pin and the gas mass flow RETURN pin at the gas mass flow sensor connector of the engine harness.

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

Voltage range on B Series engines is 12 to 15 VDC.

Voltage range on C Series engines is 13.5 to 15 VDC.
SMALL | MEDIUM | LARGE

Voltage to specifications?
YES NO
No Repair No Repair

Guided Step 2D – Read the fault codes.

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 read the fault codes.

Fault Code 453 active?
YES NO

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

 No Repair

Guided Step 3 – Check the engine harness.

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

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness connector 1 from the ECM.
  • Disconnect the engine harness from the OEM harness at the 31-pin OEM connector.

Action

  • Corroded pins
  • Bent or broken pins
  • Pushed back or expanded pins
  • Wire insulation damaged
  • 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 component pin identification.

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

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.

  • 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 019-220.
  • Replace the engine harness. Refer to Procedure 019-043.
  • Repair the OEM harness. Refer to Procedure 019-208.
  • Replace the OEM harness. Refer to the OEM troubleshooting and repair manual.
  • Replace the ECM. Call for pre-authorization.
  • Refer to Procedure 019-031.
 No Repair

Guided Step 3B – Check for an open circuit.

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness from the ECM
  • Disconnect the gas mass flow sensor form the engine harness.

Action

  • Measure the resistance between the ECM connector RETURN pin and the gas mass flow sensor connector RETURN pin.

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

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

Less than 10 ohms?
YES NO
No Repair

Repair or replace the engine harness.

  • Repair the engine harness. Refer to Procedure 019-202.
  • Replace the engine harness. Refer to Procedure 019-043.

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

Conditions

  • Turn keyswitch OFF.
  • Disconnect engine harness from the ECM.
  • Disconnect the gas mass flow sensor from the engine harness.

Action

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

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

For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360.
SMALL | MEDIUM | LARGE

More than 100k ohms?
YES NO
No Repair

Repair or replace the engine harness connector or 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 3D – Check for a pin to pin short circuit in the engine harness.

Conditions

  • Turn keyswitch OFF.
  • Disconnect engine harness from the ECM.
  • Disconnect the gas mass flow sensor from the engine harness.

Action

  • Measure the resistance between the gas mas flow sensor 12 VDC SUPPLY pin in engine harness and all other pins in the engine harness connector 1.
  • Measure the resistance between the gas mas flow sensor 12 VDC SUPPLY pin in engine harness connector 1 and all other pins in the engine harness connector 2.

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

For general resistance measurement techniques, refer to the Resistance Measurements Using a Multimeter and Wiring Diagram, Procedure 019-360.
SMALL | MEDIUM | LARGE

More than 100k ohms?
YES NO
No Repair

Repair or replace the engine harness connector or 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 3E – Read the fault codes.

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 read the fault codes.

Fault Code 453 active?
YES NO
No Repair No Repair

Guided Step 4 – Clear the fault codes.

Guided Step 4A – 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 Fault Code 453 is inactive?

Fault Code 453 inactive?
YES NO
No Repair No Repair

Guided Step 4B – 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

Troubleshoot any remaining active fault codes.
Repair complete
Appropriate troubleshooting charts
Last Modified:  02-Sep-2004
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Published by Jack

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