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Circuit Test B8 - Crankshaft Position Sensor (Cps)

Fig 1: CPS Circuit
G108500
NOTE: Enter this test only when Code 02 is displayed during the QUICK TEST procedure or when directed here from another CIRCUIT TEST. To prevent replacement of good components, be aware that the following non-EEC components may be at fault: non-electronic components of ignition system. This test is intended to diagnose only the following components: crankshaft position sensors, ECA, wiring harness and CPS circuit.
  1. Checking System Integrity  - Visually check all wiring, harnesses, connectors and components for evidence of damage, overheating, shorting or looseness. If a fault is found, repair as necessary. If no faults are found, go to next step.
  2. Checking Resistance of CPS Circuit  - Turn key off and install breakout box. Leave ECA disconnected. Set VOM on 1k-ohm scale. Measure resistance between test pins No. 42 and 56. If resistance is 210-260 ohms, go to step 5). If not, go to next step.
  3. Checking Resistance of CPS  - Turn key off and disconnect CPS. set VOM on 1k-ohm scale. Measure resistance between terminals "A" (Blue wire) and "B" (White wire) at CPS connector. If resistance is 210-260 ohms, go to next step. If resistance is not 210-260 ohms, replace CPS.
  4. Checking CPS to ECA Circuit For Opens  - Turn key off and install breakout box. Set VOM on 200-ohm scale. Measure resistance between "Blue wire" at CPS harness connector and test pin No. 42 at breakout box. Measure resistance between "White wire" at CPS harness connector and test pin No. 56 at breakout box. If both resistances are less than 5 ohms, checks for short(s) to VPWR and repair as necessary. If both resistances are 5 ohms or more, repair open in wiring circuit.
  5. Checking CPS Voltage Circuit  - Install breakout box and set VOM on 200-volt scale. With KOER (engine at idle), measure resistance between test pins No. 42 and 20 (ground). Measure resistance between test pins No. 56 and 20 (ground). If both voltages are approximately 0.6-0.8 volt, replace ECA. If voltages are not approximately 0.6-0.8 volt, go to next step.
  6. Checking For Shorted CPS Voltage Circuit  - Turn key off and install breakout box. Leave ECA disconnected. Set VOM on 200-ohm sale. Measure resistance at the breakout box between the following test pins:
    • Pin No. 42 and pins No. 1, 26, 37, 20
    • Pin No. 56 and pins No. 1, 26, 37, 20

    If any resistance is less than 5 ohms, repair short(s) as necessary. If any resistance is not less than 5 ohms, replace ECA.

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