Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Exhaust Pressure Sensor 1 Or 2, Checking
Observe all safety precautions: SAFETY PRECAUTIONS
View clean working conditions: CLEAN WORKING CONDITIONS
Prior to repair work, perform a preliminary check to verify the condition. Refer to PRELIMINARY CHECK .
Use only gold-plated terminals when servicing any component with gold-plated electrical harness connector terminals.
See Appropriate Wiring Diagram Information for component locations and connector views.
Special Tools And Workshop Equipment 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.
-- Disconnect the Exhaust Pressure Sensor -G450/G451- electrical harness connector.
Checking internal resistance
-- Using a multimeter, measure the resistance between the terminals 1 and 2 of the Exhaust Pressure Sensor -G450/G451-.
Specified value for G450 (sensor 1): 6880 Ω (+/- 500 Ω)
Specified value for G451 (sensor 2): 69.7K Ω (+/- 1000 Ω)
-- Using a multimeter, measure the resistance between the terminals 2 and 3 of the Exhaust Pressure Sensor -G450/G451-.
Specified value for G450 (sensor 1): 4028 Ω (+/- 300 Ω)
Specified value for G451 (sensor 2): 9720 Ω (+/- 300 Ω)
If any specified value was not obtained:
-- Replace the Exhaust Pressure Sensor -G450/G451-.
If the specified value was obtained:
Checking the power supply
Switch the ignition ON.
-- Using a multimeter, measure the voltage of the Exhaust Pressure Sensor -G450/G451- harness connector terminal 1 to ground.
Specified value: near 5.01 V.
-- Using a multimeter, measure the voltage of the Exhaust Pressure Sensor -G450/G451- harness connector terminal 3 to ground.
Specified value: near 5.77 V.
-- Using a multimeter, measure the voltage of the Exhaust Pressure Sensor -G450/G451- 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
-- Remove the Engine Control Module (ECM) -J623-.
-- Using a multimeter, check the Exhaust Pressure Sensor -G450- electrical harness connector to the Engine Control Module (ECM) -J623- electrical harness T60 connector for resistance. Refer to Appropriate Wiring Diagram information for Pin locations.
| Exhaust Pressure Sensor -G450- electrical harness connector terminal | Engine Control Module (ECM) -J623- electrical harness connector T94 terminals |
|---|---|
| 1 | 14 |
| 2 | 79 |
| 3 | 11 (Pin 34 for 2011) |
| Exhaust Pressure Sensor -G451- electrical harness connector terminal | Engine Control Module (ECM) -J623- electrical harness connector T94 terminals |
|---|---|
| 1 | 14 |
| 2 | 79 |
| 3 | 34 |
Specified Value: 1.5 Ω 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 appropriate Service Information for removal and installation procedures.
Final Procedures
After repair work, the following work steps must be performed in the following sequence:
- Check the DTC memory. Refer to DIAGNOSTIC MODE 03 - READ DTC MEMORY .
- If necessary, erase the DTC memory. Refer to DIAGNOSTIC MODE 04 - ERASE DTC MEMORY .
- If the DTC memory was erased, generate readiness code. Refer to READINESS CODE .
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.