Pinpoint Tests Dg: Knock Sensor (KS): Introduction

WARNING: TO PREVENT THE RISK OF HIGH-VOLTAGE SHOCK, ALWAYS FOLLOW PRECISELY ALL WARNINGS AND SERVICE INSTRUCTIONS, INCLUDING INSTRUCTIONS TO DEPOWER THE SYSTEM. THE HIGH-VOLTAGE SYSTEM UTILIZES APPROXIMATELY 300 VOLTS DC, PROVIDED THROUGH HIGH-VOLTAGE CABLES TO ITS COMPONENTS AND MODULES. THE HIGH-VOLTAGE CABLES AND WIRING ARE IDENTIFIED BY ORANGE HARNESS TAPE OR ORANGE WIRE COVERING. ALL HIGH-VOLTAGE COMPONENTS ARE MARKED WITH HIGH-VOLTAGE WARNING LABELS WITH A HIGH-VOLTAGE SYMBOL. FAILURE TO FOLLOW THESE INSTRUCTIONS MAY RESULT IN SERIOUS PERSONAL INJURY OR DEATH.

This pinpoint test is intended to diagnose the following:

knock sensor 1 (KS1) (12A699)
knock sensor 2 (KS2) (12A699)
harness circuits: KS1+, KS1-, KS2+ and KS2-
PCM (12A650)

Fig 1: Knock Sensor 1 (KS1) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
2	KS1+ (Knock Sensor 1 Positive)
1	KS1- (Knock Sensor 1 Negative)

Fig 2: Knock Sensor 2 (KS2) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
2	KS2+ (Knock Sensor 2 Positive)
1	KS2- (Knock Sensor 2 Negative)

Fig 3: Powertrain Control Module (PCM) Connector

Courtesy of FORD MOTOR CO.

Pin	Circuit
T20	KS2+ (Knock Sensor 2 Positive)
T28	KS2- (Knock Sensor 2 Negative)
T17	KS1+ (Knock Sensor 1 Positive)
T25	KS1- (Knock Sensor 1 Negative)