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{{ImportedFrom|site=Xenonzcar|title=Z31 (CHTS) CYLINDER HEAD TEMPERATURE SENSOR|url= | {{ImportedFrom|site=Xenonzcar|title=Z31 (CHTS) CYLINDER HEAD TEMPERATURE SENSOR|url=https://z31library.com/xenonzcar_archive/z31/SENSORS/CHTS.php.html|archive=https://z31library.com/xenonzcar_archive/z31/SENSORS/CHTS.php.html|fetched=2026-05-15}} | ||
== Z31 (CHTS) CYLINDER HEAD TEMPERATURE SENSOR == | == Z31 (CHTS) CYLINDER HEAD TEMPERATURE SENSOR == | ||
https://z31library.com/xenonzcar_archive/z31/FICHE/images/images/22630-01P01.jpg | |||
==== Overview ==== | ==== Overview ==== | ||
| Line 17: | Line 17: | ||
=== Part Numbers === | === Part Numbers === | ||
| Part Number | {| class="wikitable" | ||
|- | ! Part Number | ||
| 22630-01P01 | (CHTS) Cylinder Head Temperature Sensor | | ! Description | ||
| 24079-01P00 | Cylinder Head Temperature Sensor Sub-Harness | | |- | ||
| 22630-01P01 | |||
| (CHTS) Cylinder Head Temperature Sensor | |||
|- | |||
| 24079-01P00 | |||
| Cylinder Head Temperature Sensor Sub-Harness | |||
|} | |||
=== Common Problems === | === Common Problems === | ||
| Line 30: | Line 36: | ||
=== Troubleshooting === | === Troubleshooting === | ||
https://z31library.com/xenonzcar_archive/z31/SENSORS/CHTS/CHTStroubleshooting1full.png | |||
To test, measure the Ohms across the 16 pin ECU connector on terminals 23 and 26. The chart will provide the correct readouts: | 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 | {| class="wikitable" | ||
|- | ! Cylinder Head Temperature | ||
| Above 20°C (68°F) | Below 2.9kΩ | | ! Resistance in Ohms | ||
| Below 20°C (68°F) | Above 2.1kΩ | | |- | ||
| 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 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. | ||
| Line 43: | Line 55: | ||
If the harness looks OK, then you can test the sensor using the chart below. | If the harness looks OK, then you can test the sensor using the chart below. | ||
https://z31library.com/xenonzcar_archive/z31/SENSORS/CHTS/CHTStroubleshooting2chart.jpg | |||
=== Sources Used === | |||
* [https://z31library.com/xenonzcar_archive/z31/z31fsm.php 1984-1988 Nissan 300ZX Factory Service Manual] | |||
[[Category:Imported from Xenonzcar]] | [[Category:Imported from Xenonzcar]] | ||
Latest revision as of 22:53, 20 October 2026
Imported page. This page was converted from an archived copy of "Z31 (CHTS) CYLINDER HEAD TEMPERATURE SENSOR" (Xenonzcar, fetched 2026-05-15). The conversion was mechanical, so tables, links and formatting may contain conversion artefacts. Compare against the archived copy if something looks wrong. The content belongs to its original authors.
Z31 (CHTS) CYLINDER HEAD TEMPERATURE SENSOR[edit]
Overview[edit]
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[edit]
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[edit]
| Part Number | Description |
|---|---|
| 22630-01P01 | (CHTS) Cylinder Head Temperature Sensor |
| 24079-01P00 | Cylinder Head Temperature Sensor Sub-Harness |
Common Problems[edit]
- Missing or backfiring on cold starts. ECU Code #13
- Fouling out plugs (rich)
- Black smoke
Troubleshooting[edit]
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.
