Circuit Test KS - Knock Sensor

Fig 1: KS Circuit & Connector Terminals (KS - 2.5L) ID

NOTE: Enter this test only when a Code 05 is displayed during self-test procedures (KOEO or KOER) or when directed here from another circuit test. This test is intended to diagnose KS circuit only.

CIRCUIT PIN IDENTIFICATION

Circuit	Breakout Box Pin No.	PCM Pin	Wire Color
GND	49	3C	Black/Red
KS	23	2M	White

1) Check System Integrity Visually check all wiring, connectors and components for evidence of damage, shorting or looseness. If a fault is found, repair as necessary. If no fault is found, go to next step.

2) Check Signal From PCM Turn ignition off. Install breakout box. Connect PCM to breakout box. Turn ignition on. Measure voltage between ground and KS test pin at breakout box. If voltage is about 2.4 volts, go to next step. If voltage is not about 2.4 volts, go to CIRCUIT TEST VPWR. If VPWR circuit is okay and no other problem or code is found, replace PCM.

3) Check For Open KS Wire Ensure ignition is off, breakout box is installed and PCM is disconnected. Disconnect KS connector. Measure resistance between KS test pin at breakout box and KS terminal at KS connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open KS wire.

4) Check For Short In KS Wire Ensure ignition is off, breakout box is installed and PCM is disconnected. With KS connector disconnected, measure resistance between ground and KS test pin at breakout box. If resistance is more than 10,000 ohms, go to next step. If resistance is less than 10,000 ohms, repair short to ground in KS wire.

5) Check KS Ground Turn ignition off. With KS connector disconnected, measure resistance of GND wire between ground and KS connector. If resistance is less than 5 ohms, replace KS. If resistance is at least 5 ohms, repair open GND wire.