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.
For wiring diagrams, component locations, and connector views, Refer to the applicable wiring diagram.
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-. Refer to the Repair information.
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
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 information.
-- 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.
| Exhaust Pressure Sensor -G450- electrical harness connector terminal | Engine Control Module (ECM) -J623- electrical harness connector T94 terminals or test box socket |
|---|---|
| 1 | 14 |
| 2 | 79 |
| 3 | 34 |
| Exhaust Pressure Sensor -G451- electrical harness connector terminal | Engine Control Module (ECM) -J623- electrical harness connector T94 terminals or test box socket |
|---|---|
| 1 | 14 |
| 2 | 79 |
| 3 | 11 |
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 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 .