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Electronic Control System Gas Plus Engines – FAULT CODE 355

Intake Manifold Pressure Sensor Circuit – Shorted Low

Overview

Intake Manifold Pressure Sensor Circuit – Shorted Low

CODE REASON EFFECT
Fault Code: 355
PID: P106
SPN: 106
FMI: 4
LAMP: Amber
SRT: 

Intake Manifold Pressure Sensor Circuit – Shorted Low . Low voltage (short to ground) detected on the sensor signal pin at the ECM.

Possible reduced performance.

Intake Manifold Pressure Sensor Circuit
SMALL | MEDIUM | LARGE

Circuit Description

The electronic control module (ECM) uses the intake manifold pressure/temperature sensor input to determine the pressure of the air mixture entering the engine. This sensor is used to determine the fueling calculation into the engine.

Component Location

The intake manifold pressure/temperature sensor is located in the intake manifold housing (combination sensor with temperature).

Shop Talk

This sensor detects the pressure and temperature of the air/fuel mixture entering the engine. All pressure sensors on the Plus engines are absolute sensors.

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 leads when taking a measurement:
Part Number 3822758 – male Deutsch/AMP/Metri-Pack test lead
Part Number 3824775 – breakout cable.

Troubleshooting Steps

STEPS SPECIFICATIONS
STEP 1. Check the fault codes.  
  STEP 1A. Check for fault codes. Fault Code 352 active?
  STEP 1B. Check for an inactive fault code. Fault Code 355 inactive?
STEP 2. Check the intake manifold pressure sensor and circuit.  
  STEP 2A. Inspect the intake manifold pressure sensor and connector pins. Dirty or damaged pins?
  STEP 2B. Check the sensor supply voltage and return circuit. 4.5 to 5.25 VDC?
  STEP 2C. Check the circuit response. Fault Code 354 active and Fault Code 355 inactive?
  STEP 2D. Check the fault codes and verify sensor condition. Fault Code 355 active?
STEP 3. Check the ECM and engine harness.  
  STEP 3A. Inspect the ECM and engine harness 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 an open circuit in the engine harness. Less than 10 ohms?
  STEP 3D. Check for a pin to pin short circuit 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 355 inactive?
STEP 4. Clear the fault codes.  
  STEP 4A. Disable the fault code. Fault Code 355 inactive?
  STEP 4B. 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 the INSITE™ electronic service tool.

Action

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

Fault Code 352 active?
YES NO
No Repair No Repair
Fault Code 352

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

Conditions

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

Action

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

Fault Code 355 active?
YES NO
No Repair No Repair

Guided Step 2 – Check the intake manifold pressure sensor and circuit.

Guided Step 2A – Inspect the intake manifold pressure sensor and connector pins.

Conditions

  • Turn keyswitch OFF
  • Disconnect the intake manifold pressure 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.

For general 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 sensor or harness connector.

Repair the damaged pins.

Repair or replace the harness, 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 019-202.
  • Replace the harness. Refer to Procedure 019-043.
  • Replace the sensor. Refer to Procedure 019-188.
 No Repair

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

Conditions

  • Turn keyswitch OFF
  • Disconnect the intake manifold pressure sensor from the engine harness.
  • Turn keyswitch ON.

Action

  • Measure the voltage between the 5 Volt SUPPLY pin and the intake manifold pressure RETURN pin at the intake manifold pressure sensor connector of the engine harness.

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

4.5 to 5.25 VDC?
YES NO
No Repair No Repair

Guided Step 2C – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the intake manifold pressure sensor from the engine harness
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

  • Check for the appropriate circuit response after 30 seconds.
  • Use INSITE™ electronic service tool to read the fault codes

Fault Code 354 active and Fault Code 355 inactive?
YES NO
No Repair No Repair

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

Conditions

  • Turn keyswitch OFF
  • Connect the intake manifold pressure sensor to the engine harness
  • Turn keyswitch ON
  • Connect INSITE™ electronic service tool.

Action

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

Fault Code 355 active?
YES NO

A defective sensor has been detected

Replace the intake manifold pressure sensor. Refer to Procedure 019-354.

 No Repair

Guided Step 3 – Check the ECM and engine harness.

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

Conditions

  • Turn keyswitch OFF
  • Disconnect engine harness from the ECM.

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.

For general 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 or engine harness connector.

Repair the damaged pins.

Repair or replace the 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 harness. Refer to Procedure 019-204.
  • Replace the harness. Refer to Procedure 019-043.
No Repair

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

Conditions

  • Turn keyswitch OFF
  • Disconnect the engine harness from the ECM
  • Disconnect the intake manifold pressure sensor from the engine harness.

Action

  • Measure the resistance between the engine harness ECM connector 1 SUPPLY pin and the intake manifold pressure sensor connector SUPPLY pin.

Refer to the circuit diagram or wiring diagram for connector 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

An open SUPPLY circuit has been detected in engine harness.

Repair or replace the harness.

  • Repair the harness. Refer to Procedure 019-204.
  • Replace the harness. Refer to Procedure 019-043.

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

Conditions

  • Turn keyswitch OFF
  • Disconnect the engine harness from the ECM
  • Disconnect the intake manifold pressure sensor from the engine harness.

Action

  • Measure the resistance between the engine harness ECM connector 1 SIGNAL pin and the intake manifold pressure sensor connector SIGNAL pin.

Refer to the circuit diagram or wiring diagram for connector 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

An open SIGNAL circuit has been detected in engine harness.

Repair or replace the harness.

  • Repair the harness. Refer to Procedure 019-204.
  • Replace the 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 the engine harness from the ECM.
  • Disconnect the intake manifold pressure sensor from the engine harness.

Action

  • Measure the resistance between the intake manifold pressure SIGNAL pin in engine harness ECM connector 1 and all other pins in the connector 1.
  • Measure the resistance between the intake manifold pressure SIGNAL pin in engine harness ECM connector 1 and all pins in connector 2.

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

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

Greater than 100k ohms?
YES NO
No Repair

A pin to pin to pin short circuit on the SIGNAL line has been detected in the engine harness.

Repair or replace the harness.

  • Repair the harness. Refer to Procedure 019-204.
  • Replace the harness. Refer to Procedure 019-043.

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

Conditions

  • Turn keyswitch OFF
  • Disconnect the engine harness from the ECM.
  • Disconnect the intake manifold pressure sensor from the engine harness.

Action

  • Measure the resistance between the intake manifold pressure SIGNAL pin in engine harness ECM connector 1 and ground.

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

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

Greater than 100k ohms?
YES NO
No Repair

A pin to pin to ground short circuit on the SIGNAL line has been detected in the engine harness.

Repair or replace the harness.

  • Repair the harness. Refer to Procedure 019-204.
  • Replace the harness. Refer to Procedure 019-043.

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

Conditions

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

Action

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

Fault Code 355 inactive?
YES NO
No Repair

Replace the ECM. Call for pre-authorization. Refer to procedure 019-031.

Guided Step 4 – Clear the fault codes.

Guided Step 4A – Disable the fault code.

Conditions

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

Action

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

Fault Code 355 inactive?
YES NO
No Repair No Repair

Guided Step 4B – Clear the inactive fault codes.

Conditions

  • Connect all components
  • Turn keyswitch ON
  • Connect the 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:  17-Aug-2004
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