Test TC-59A - Knock Sensor Circuit

NOTE: For connector terminal ID, see CONNECTOR IDENTIFICATION Directory. For wiring diagram, see WIRING DIAGRAMS article.

Disconnect knock sensor connector. See 41. Turn ignition on with engine off. Using scan tool in voltmeter mode, check voltage on knock sensor connector signal circuit. See KNOCK SENSOR CONNECTOR WIRE IDENTIFICATION table. If voltage is 2 volts or less, go to next step. If voltage is more than 2 volts, repair short to voltage on knock sensor signal circuit. Perform TEST VER-2A.

Fig 1: Knock Sensor Location

KNOCK SENSOR CONNECTOR WIRE IDENTIFICATION

Application	Wire Color
Knock Sensor Signal Circuit	White/Yellow
Knock Sensor Ground Circuit	Black/Dark Green

Using scan tool in ohmmeter mode, check resistance of knock sensor ground circuit. See KNOCK SENSOR CONNECTOR WIRE IDENTIFICATION table. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open knock sensor ground circuit. Perform TEST VER-2A.
Turn ignition off. Disconnect Powertrain Control Module (PCM) connector. Using scan tool in ohmmeter mode, check resistance of knock sensor signal circuit. See KNOCK SENSOR CONNECTOR WIRE IDENTIFICATION table. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on knock sensor ground circuit. Perform TEST VER-2A.
Using an external ohmmeter, check resistance of knock sensor signal circuit between knock sensor connector and PCM connector terminal No. 24. If resistance is less than 5 ohms, replace knock sensor. Perform TEST VER-2A. If resistance is 5 ohms or more, repair open knock sensor signal circuit. Perform TEST VER-2A.