Knock Sensor Test
- Turn ignition on. Engine warning lamp (on instrument panel) should come on. Start engine and accelerate engine to 3000 RPM (1 time only). Engine warning lamp must go off. If lamp goes out, test is completed.
- If lamp does not go out, install a fuse in test terminals of fuel pump relay for a minimum of 3 seconds. See Fig 1. Engine warning lamp must start blinking. If lamp stays on, go to TIMING ADVANCE TEST .
- If lamp blinks in intervals of 2, the knock sensor circuit is defective. Check knock sensor tightness. If loose, tighten knock sensor to 10 ft. lbs. (14 Nm). Check for open circuit in knock sensor wiring. If wiring is okay, knock sensor or Hall control unit is defective.
- If lamp blinks in intervals of 3, check White vacuum hose to electronic ignition control unit for damage. Check for faulty throttle switches. See IDLE & FULL THROTTLE SWITCH TEST . If okay, pressure sensor in unit is faulty.