With Manufacturer's Scan Tool
Engine Speed Sensor, Checking
Note:
Use only gold-plated terminals when servicing terminals in the electrical harness connector of the Engine Speed (RPM) Sensor -G28-.
Special tools and workshop equipment required:
- Multimeter
- Wiring diagram.
Test requirements:
- The Motronic Engine Control Module (ECM) -J220- fuses OK.
- Battery voltage at least 12.5 volts.
- All electrical consumers such as, lights and rear window defroster, switched off.
- Vehicles with automatic transmission, shift selector lever into position "P" or "N".
- A/C switched off.
- Ground (GND) connections between engine/transmission/chassis OK.
- Ignition switched off.
Test procedure:
Perform a preliminary check to verify the customer's complaint. Refer to 3.1 Preliminary Check.
Start diagnosis
Note:
The Engine Speed (RPM) Sensor -G28- detects RPM and reference marks. Without an engine speed signal, the engine will not start. If the engine speed signal fails while the engine is running, the engine will stop immediately.
Function test:
Connect the scan tool.
Switch the ignition on.
Using the scan tool, check the engine speed:
End diagnosis and switch ignition off.
If the specified value was not obtained:
Checking internal resistance
- Disconnect the Engine Speed (RPM) Sensor -G28- electrical harness connector
- Using a multimeter , check the Engine Speed (RPM) Sensor -G28- terminals 2 to 3 for resistance.
- Specified value: 0.7 to 1000k ohms
- Check Engine Speed (RPM) Sensor -G28- terminals 1 to 2 and 1 to 3 for short circuits.
- Specified value: (infinity)
If any of the specified values are not obtained:
- Replace the Engine Speed (RPM) Sensor -G28-. Refer to Engine Mechanical; Repair Group 13
If the specified values are obtained:
Checking wiring
- If the manufacturers test box is being used, perform the following step:
Install the Adapter Cable (121-pin) -VAG 1598/31-. Refer to Fuel Injection and Ignition; Repair Group 24 ; Fuel Injection System,Servicing.
- If the manufacturers test box is not being used, perform the following step:
Remove the Motronic Engine Control Module (ECM) -J220-. Refer to 4.2 Engine Control Module, Replacing,
- Using a Multimeter, check the Engine Speed (RPM) Sensor - G28- electrical harness connector terminals to the Motronic Engine Control Module (ECM) -J220- electrical harness connector terminals for resistance.
Specified value: 1.5 ohms Max.
If the specification was not obtained:
- Check the wiring for an open circuit, short circuit to each other, Battery (+), and Ground (GND).
- Check the electrical harness connector for damage, corrosion, loose or broken terminals.
- If necessary, repair the faulty wiring connection.
If no malfunction is detected in the wiring:
- Remove the Engine Speed (RPM) Sensor -G28- and check the sensor wheel for proper seating, damage and run-out. Refer to Fuel Injection and Ignition; Repair Group 24: Fuel Injection System, Servicing.
If the sensor wheel is OK:
- Erase the DTC memory. Refer to: 2.4 Diagnostic Mode 04 - Erase DTC Memory.
- Perform a road test to verify repair.
If the DTC does not return:
- Repair complete, Generate readiness code. Refer to: 4 Readiness Code,
End diagnosis
If the DTC does return and no malfunction is detected in the wiring and the voltage supply was not OK:
- Replace the Motronic Engine Control Module (ECM) -J220-. Refer to: 4.2 Engine Control Module, Replacing.
- Assembly is performed in the reverse of the removal.
Final procedures:
After the repair work, the following work steps must be performed in the following sequence:
1. Check the DTC memory. Refer to: 2.3 Diagnostic Mode 03 - Read DTC Memory.
2. If necessary, erase the DTC memory. Refer to: 2.4 Diagnostic Mode 04 - Erase DTC Memory,
3. If the DTC memory was erased, generate readiness code. Refer to: 4 Readiness Code.
End diagnosis