Camshaft Position Sensor
NOTE:
All voltage and continuity tests should be performed with a Digital Volt-Ohmmeter (DVOM) with a minimum 10-megohm input impedance, unless specifically stated differently in testing procedures. For help with diagnostic testing. See WIRING DIAGRAMS .
The Camshaft Position (CMP) sensor is located on the rear of the cylinder head. Location of CMP harness connection. See COMPONENT LOCATIONS .
- Connect (VAG 1598) test box to Engine Control Module (ECM) using (VAG 1598/5) adaptor cable. See CONNECTING VAG 1598 TEST BOX .
- Connect LED Tester (US 1115) between terminals No. 8 and 12. Operate starter for a few seconds. LED tester must blink briefly during every second engine revolution. If LED tester does not blink, switch ignition OFF.
- Disconnect 3-pin CMP sensor connector at distributor. See Fig 1.
- Using DVOM, switched to resistance range. Check wires according to the wiring diagram for continuity and/or short circuit to each other, as described below. See Figure and Fig 1 . See WIRING DIAGRAMS .
- Check wires:
- Between CMP sensor connector terminal No. 1 and test box socket 19.
- Between CMP sensor connector terminal No. 2 and test box socket 8.
- Between CMP sensor connector terminal No. 3 and test box socket 12.
- If there is neither an open circuit nor a short circuit, using DVOM, switched to 20 Volt range.
- Connect DVOM to terminals No. 12 and 19 using adapter cables from (VW 1594) adaptor kit.
- Switch ignition ON. Voltage must be 4.5-5.5 volts. Switch ignition to OFF position.
- Connect DVOM to terminals No. 8 and 19.
- Switch ignition ON. Voltage must be 4.3-5.2 volts. Switch ignition OFF.
- If NO in each case: Replace ECM. After replacement of ECM, see ECM IDENTIFICATION and ECM CODING under SELF-DIAGNOSTIC SYSTEM in SELF-DIAGNOSTICS article.
- If YES in each case: Replace Camshaft Position (CMP) sensor and set basic adjustment. See CAMSHAFT POSITION SENSOR BASIC ADJUSTMENT under IGNITION SYSTEMS.