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Code 13 - Camshaft Position Sensor

NOTE: Refer to illustration for connector and terminal identification. See Figure -Figure .
  1. Place oscilloscope leads between ECM connector E30, terminals No. 8 and 9. Check signal voltage on oscilloscope while cranking engine. For voltage specs., see the PIN VOLTAGE CHARTS article. If input signal is okay, repair ECM harness connector or replace ECM as necessary. If ECM input signal is not okay, go to next step.
  2. Turn ignition off. Disconnect ECM and camshaft position sensor connectors. Measure resistance between ECM connector E30, terminal No. 8 and camshaft position sensor connector terminal No. 1 (Black wire), and ECM connector E30, terminal No. 9 and camshaft position sensor connector terminal No. 2 (White wire). In both cases, resistance should be 10 ohms maximum. Measure resistance between ground and ECM connector E30, terminals No. 8, 9 and 11. Resistance should be a minimum of one megohm at each terminal.
  3. If resistances are not to specification, repair or replace harness or connectors as necessary. If resistances are to specification, remove camshaft position sensor. Put positive lead of oscilloscope at camshaft position sensor terminal No. 1 (Black wire) and negative lead at terminal No. 2 (White wire). Check for a wave pattern while passing a magnet near camshaft position sensor pick-up coil.
  4. If a wave pattern appears, check for problem between camshaft position sensor and camshaft sprocket. If a wave pattern does not appear, replace camshaft position sensor.
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