Z31/SENSORS/CHTS php

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Z31 (CHTS) CYLINDER HEAD TEMPERATURE SENSOR

Overview

The Cylinder Head Temperature Sensor (CHTS) is built into the cylinder head and monitors temperature changes, sending a signal to the ECU.

How It Works

The sensor uses a thermistor—a resistor sensitive to temperature. As cylinder head temperature rises, the electrical resistance of the thermistor decreases.

WARNING - Do this modification at your own risk. We Are not responsable for any issues of your own doing.

Part Numbers

Part Number	Description
22630-01P01	(CHTS) Cylinder Head Temperature Sensor
24079-01P00	Cylinder Head Temperature Sensor Sub-Harness

Common Problems

• Missing or backfiring on cold starts. ECU Code #13
• Fouling out plugs (rich)
• Black smoke

Troubleshooting

To test, measure the Ohms across the 16 pin ECU connector on terminals 23 and 26. The chart will provide the correct readouts:

Cylinder Head Temperature	Resistance in Ohms
Above 20°C (68°F)	Below 2.9kΩ
Below 20°C (68°F)	Above 2.1kΩ

If the readings are OK here, then replace the ECU. If the readings are out of spec, first check the harness for damage including corrosion and broken wires.

If the harness looks OK, then you can test the sensor using the chart below.

Sources Used

• 1984-1988 Nissan 300ZX Factory Service Manual