Editing Z31/SENSORS/cas php (section)

=== Troubleshooting ===

The ECCS of the Z31 will flash trouble codes using two LED lamps on the ECU. [[Z31/computerpinout|A chart of these codes is available on the ECU page]].

'''Code 11:'''Indicates a fault in the Crank Angle Sensor Circuit.

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'''Check ground at Pin 4:'''Disconnect the 4-pin crank angle sensor connector at the sensor. Measure resistance to ground on'''Pin 4'''. It should read'''0 Ω'''. If not, you have a bad ground—repair or replace the harness.

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'''Check voltage at Pin 1:'''With the ignition ON, use a multimeter to check for battery voltage on'''Pin 1'''of the connector.

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'''Check harness continuity:'''If steps 1 and 2 are good, disconnect the 20-pin connector at the[[Z31/computerpinout|ECCS unit]]and check resistance between'''Pins 8 and 17'''. This ensures no broken insulation or open circuit in the harness.

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'''Final continuity test:'''Add a jumper wire between'''Pins 2 and 3'''of the Crank Angle Sensor plug. Then, test for continuity (should be 0 Ω) between'''Pins 8 and 17'''on the 20-pin connector at the ECCS unit.

If any of these tests fail, repair the harness or replace the faulty sensor as needed.