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Electronic Control System Gas Plus Engines – FAULT CODE 352 – L Gas Plus

Sensor Supply Voltage Number 1 Circuit – Shorted Low

Overview

CODE REASON EFFECT
Fault Code: 352
PID: 232
SPN: 1079
FMI: 4
LAMP: Amber
SRT: 

Sensor Supply Voltage Number 1 Circuit – Shorted Low. Low voltage detected on sensor supply number 1 circuit.

Possible reduced performance.

Sensor Supply Voltage Number 1 Circuit
SMALL | MEDIUM | LARGE

Circuit Description

This circuit is the voltage supply for the intake manifold pressure/temperature sensor; the secondary fuel pressure/temperature sensor, the humidity sensor, air inlet restriction sensor, the camshaft position sensor, the crankshaft position sensor and the oil pressure sensor.

Component Location

The sensor supply voltage 5 Volt (1) circuit is contained in the wiring harness.

Shop Talk

The voltage supplies for the L Gas Plus engines are broken up into 1, 2, and 4.

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. Check for an inactive fault code. Fault Codes 352 inactive?
STEP 2. Check the sensors and sensor supply circuit.  
  STEP 2A. Inspect the intake manifold pressure/temperature sensor and connector pins connected to sensor supply number 1. Dirty or damaged pins?
  STEP 2A-1. Check the circuit response.
  STEP 2B. Inspect the fuel pressure/temperature sensor and connector pins connected to sensor supply number 1. Dirty or damaged pins?
  STEP 2B-1. Check the circuit response.
  STEP 2C. Inspect the engine oil pressure/temperature sensor and connector pins connected to sensor supply number 1. Dirty or damaged pins?
  STEP 2C-1. Check the circuit response.
  STEP 2D. Inspect the humidity sensor and connector pins connected to sensor supply number 1. Dirty or damaged pins?
  STEP 2D-1. Check the circuit response.
  STEP 2E. Inspect the air inlet restriction pressure sensor and connector pins connected to sensor supply number 1. Dirty or damaged pins?
  STEP 2E-1. Check the circuit response.
  STEP 2F. Inspect the camshaft position sensor and connector pins connected to sensor supply number 1. Dirty or damaged pins?
  STEP 2F-1. Check the circuit response.
  STEP 2G. Inspect the Crankshaft position sensor and connector pins connected to sensor supply number 1. Dirty or damaged pins?
  STEP 2G-1. Check the circuit response.
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 a pin to pin short circuit in the engine harness. Greater than 100k ohms?
  STEP 3B-1. Check for a pin short circuit to ground.
  STEP 3C. Check for an inactive fault code. Fault Code 352 inactive?
STEP 4. Clear the fault codes.  
  STEP 4A. Disable the fault code. Fault Codes 352 inactive?
  STEP 4B. Clear the inactive fault codes. All fault codes cleared?

Guided Step 1 – Check the fault codes.

Guided Step 1A – 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 Codes 352 inactive?
YES NO
No Repair No Repair

Guided Step 2 – Check the sensors and sensor supply circuit.

Guided Step 2A – Inspect the intake manifold pressure/temperature sensor and connector pins connected to sensor supply number 1.

Conditions

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

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.

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 sensor or harness connector.

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.
No Repair

Guided Step 2A-1 – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the intake manifold pressure/temperature 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 352 active?
YES NO
No Repair

A defective sensor has been detected.

Replace the intake manifold pressure/temperature sensor. Refer to Procedure 019-099.

Guided Step 2B – Inspect the fuel pressure/temperature sensor and connector pins connected to sensor supply number 1.

Conditions

  • Turn keyswitch OFF
  • Disconnect the fuel pressure/temperature sensor from the engine harness.

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.

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 sensor or harness connector.

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.
No Repair

Guided Step 2B-1 – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the fuel pressure/temperature 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 352 active?
YES NO
No Repair

A defective sensor has been detected.

Replace the fuel pressure/temperature sensor. Refer to Procedure 019-153.

Guided Step 2C – Inspect the engine oil pressure sensor and connector pins connected to sensor supply number 1.

Conditions

  • Turn keyswitch OFF
  • Disconnect the engine oil pressure sensor from the engine harness.

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.

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 sensor or harness connector.

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.
No Repair

Guided Step 2C-1 – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the engine oil pressure 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 352 active?
YES NO
No Repair

A defective sensor has been detected.

Replace the engine oil pressure sensor. Refer to Procedure 019-066.

Guided Step 2D – Inspect the humidity sensor and connector pins connected to sensor supply number 1.

Conditions

  • Turn keyswitch OFF
  • Disconnect the humidity sensor from the engine harness.

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.

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 sensor or harness connector.

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.
No Repair

Guided Step 2D-1 – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the humidity 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 352 active?
YES NO
No Repair

A defective sensor has been detected.

Replace the humidity sensor. Refer to Procedure 019-356.

Guided Step 2E – Inspect the air inlet restriction pressure sensor and connector pins connected to sensor supply number 1.

Conditions

  • Turn keyswitch OFF
  • Disconnect the air inlet restriction pressure sensor from the engine harness.

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.

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 sensor or harness connector.

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.
No Repair

Guided Step 2E-1 – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the air inlet restriction pressure 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 352 active?
YES NO
No Repair

A defective sensor has been detected.

Replace the air inlet restriction pressure sensor. Refer to Procedure 019-433.

Guided Step 2F – Inspect the camshaft position sensor and connector pins connected to sensor supply number 1.

Conditions

  • Turn keyswitch OFF
  • Disconnect the camshaft position sensor from the engine harness.

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.

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 sensor or harness connector.

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.
No Repair

Guided Step 2F-1 – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the camshaft position 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 352 active?
YES NO
No Repair

A defective sensor has been detected.

Replace the camshaft position sensor. Refer to Procedure 019-363.

Guided Step 2G – Inspect the crankshaft position sensor and connector pins connected to sensor supply number 1.

Conditions

  • Turn keyswitch OFF
  • Disconnect the crankshaft position sensor from the engine harness.

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.

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 sensor or harness connector.

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.
No Repair

Guided Step 2G-1 – Check the circuit response.

Conditions

  • Turn keyswitch OFF
  • Disconnect the crankshaft position 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 352 active?
YES NO
No Repair

A defective sensor has been detected.

Replace the crankshaft position sensor. Refer to Procedure 019-365.

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 connector 1 and connector 2 from the ECM.

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.

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 or engine harness connector.

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.
No Repair

Guided Step 3B – 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 fuel pressure/temperature sensor, engine oil pressure sensor, intake manifold pressure/temperature sensor, humidity sensor air inlet restriction sensor, camshaft position sensor, and crankshaft position sensor from the engine harness.
  • Disconnect all components connected to sensor supply number 1.

Action

  • Measure the resistance between the sensor SUPPLY number 1 pin in the engine harness ECM connector 1 to all other pins in the engine connector 1.
  • Measure the resistance between the sensor SUPPLY number 1 pin in the engine harness ECM connector 1 to all pins in the engine connector 2.

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 sensor supply number 1 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 3B-1 – Check for a pin short circuit to ground.

Conditions

  • Turn keyswitch OFF.
  • Disconnect engine harness connector 1 from the ECM.
  • Disconnect the fuel pressure/temperature sensor, engine oil pressure sensor, intake manifold pressure/temperature sensor, humidity sensor, air inlet restriction sensor, camshaft position sensor, and crankshaft position sensor from the engine harness.
  • Disconnect all components connected to sensor supply number 1.

Action

  • Measure the resistance between the sensor supply number 1 pin in the engine harness ECM connector 1 and ground.

More than 100k ohms?
YES NO
No Repair

A pin to ground short circuit on the sensor supply number 1 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 3C – 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 Codes 352 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 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 codes are inactive.

Fault Codes 352 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 No Repair
Repair complete
Appropriate troubleshooting charts
Last Modified:  28-Sep-2004
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