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Engine Speed (RPM) sensor, checking Volkswagen Passat B5 рестайлинг

4.0L 8-CYL 4V Generic Scan Tool, Engine Code(s) Bdp 3 illustrations ~445 words

Engine Speed (RPM) sensor, checking

Function

The Engine Speed (RPM) Sensor -G28- detects engine speed 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.

Recommended special tools and equipment

  1. V.A.G 1526 Multimeter or V.A.G 1715 Multimeter
  2. V.A.G 1594 Connector test kit
  3. Wiring diagram

Requirements

  1. The respective fuses of Motronic Engine Control Module (ECM) -J220- must be OK

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

  1. Fuses -1, 2, 3, 4 and 7- in protective housing (plenum chamber, left) must be OK

Refer to Electrical Wiring Diagrams, Troubleshooting & Component Locations

  1. Battery voltage must be at least 11.5 Volts.
  2. All electrical consumers, e.g. lights and rear window defroster, must be switched off.
  3. Parking brake must be engaged or else daylight driving lights will be switched on.
  4. If vehicle is equipped with an A/C system, it must be switched off.
  1. Ground (GND) connections between engine and chassis must be OK.

Work sequence

  1. Remove intake air hose between Mass Air Flow (MAF) sensor and throttle valve control module. Refer to «Air filter, disassembling and assembling»(ref-255339-S04471999162007053000000) , item 1.

Scheme 909

Scheme 909
Scheme 909
  1. Disconnect 3-pin connector from Engine Speed (RPM) Sensor -G28-.

Checking voltage supply and wiring to control module

Scheme 910

Scheme 910
Scheme 910
  1. Connect multimeter between terminal 1 (B+) and 3 (Ground) for voltage measurement.
  2. Switch ignition on.

Specified value: at least 4.5 V

  1. Switch ignition off.

If there is no voltage

  1. Connect test box to control module wiring harness. Refer to «Test box, connecting for wiring test»(ref-255339-S34843680502007053000000) .

Scheme 911

Scheme 911
Scheme 911
  1. Check wires between test box and 3-pin connector for open circuit according to wiring diagram.

Terminal 1 + socket 98

Terminal 2 + socket 82

Terminal 3 + socket 90

Wire resistance: max. 1.5 ohms

  1. Also check wires for short circuit to each other.

Specified value: infinity ohms

If no malfunctions are found in the wires and there was voltage between terminals 1 + 3

  1. Remove sensor and check sensor wheel for secure fit, damage, and run-out.

Note. There is a larger-sized gap on the sensor wheel. This gap is the reference mark and does not mean that the sensor wheel is damaged.

If nothing seems to be wrong with the sensor wheel

  1. Replace Engine Speed (RPM) Sensor -G28-.
  2. Erase DTC memory of Engine Control Module (ECM). Refer to «Diagnostic mode 4: Reset/erase diagnostic data»(ref-255339-S26400046962007053000000)
  3. Generate readiness code. Refer to «Readiness code, generating»(ref-255339-S37690993602007053000000)

If no malfunctions are found in wires and there was no voltage between terminals 1 + 3

  1. Replace Motronic Engine Control Module (ECM) -J220-. Refer to «Engine Control Module (ECM), replacing»(ref-255339-S39919263362007053000000) .