Differential Pressure Sensor, Checking
Differential Pressure Sensor, Checking
Observe all safety precautions: => [ Safety Precautions ] Generic Scan Tool
View clean working conditions: => [ Clean Working Conditions ] Clean Working Conditions
Prior to repair work, perform a preliminary check to verify the condition. Refer to => [ Preliminary Check ] Preliminary Check.
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
Special tools, testers and auxiliary items required
• Multimeter
• Wiring diagram
Test requirements
• The engine control module fuses OK
• The battery voltage at least 12.5 V
• All electrical consumers switched off
• Engine MUST be at room temperature.
• The ignition switched off
Test procedure
Make sure the engine is at room temperature.
- Check the flexible hose and connections between the particulate filter and the pressure sensor for leaks or damage.
- Disconnect the Differential Pressure Sensor (G505) electrical harness connector.- 3 -
Checking internal resistance
- Using a multimeter, measure the resistance between the terminals 1 and 2 of the Differential Pressure Sensor (G505).
Specified value: 2041 ohms (+/- 150 ohms)
- Using a multimeter, measure the resistance between the terminals 2 and 3 of the Differential Pressure Sensor (G505).
Specified value: 1201 ohms (+/- 150 ohms)
If any specified value was not obtained:
- Replace the Differential Pressure Sensor (G505). Refer to the Repair Manual.
If the specified value was obtained:
Checking the power supply
Switch the ignition ON.
- Using a multimeter, measure the voltage of the Differential Pressure Sensor (G505) harness connector terminal 1 to ground.
Specified value: near 5.01 V.
- Using a multimeter, measure the voltage of the Differential Pressure Sensor (G505) harness connector terminal 3 to ground.
Specified value: near 5.70 V.
- Using a multimeter, measure the voltage of the Differential Pressure Sensor (G505) harness connector terminal 2 to Battery Positive.
Specified value: Battery voltage.
- Switch the ignition OFF.
If any of the specified values were Not obtained:
Checking wiring
If the manufacturers test box is being used, perform the following step.
- Install the test box.
If the manufacturers test box is not being used, perform the following step.
- Remove the Engine Control Module (ECM) (J623). Refer to the Repair Manual.
- Using a multimeter, check the Differential Pressure Sensor (G505) electrical harness connector to the Engine Control Module (ECM) (J623) electrical harness T91 connector for resistance.
Specified value: 1.5 ohms Max.
If the specified value was not obtained:
- Check the wiring for a short circuit to each other, Battery positive, Ground or high resistance.
- If necessary, repair the faulty wiring connection.
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
If no malfunction is detected in the wiring and the voltage readings were Not correct:
- Replace the Engine Control Module (ECM) (J623). Refer to the service manual for removal and installation procedures.
Final procedures
After repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to => [ Diagnostic Mode 03 - Read DTC Memory ] Diagnostic Modes 01 - 09.
2. If necessary, erase the DTC memory. Refer to => [ Diagnostic Mode 04 - Erase DTC Memory ] Diagnostic Modes 01 - 09.
3. If the DTC memory was erased, generate readiness code. Refer to => [ Readiness Code ] Programming and Relearning.