Problem: The truck came in because the
malfunction indicator lamp was (MIL) ON.
Details: The technician retrieved the
following diagnostic trouble codes (DTCs):
P0327 – Knock Sensor Circuit Performance Sensor 1
P0332 – Knock Sensor Circuit Performance Sensor 2
The technician decided to replace both Knock Sensors. He also did
a tune-up and checked the crankshaft position sensor (it was
okay). After a test drive, the DTCs returned.
Tech-Assist suggested to first measure the knock sensors
resistance (Spec: 93K – 107K) either at the 2-wire connector at
the top left rear of the intake manifold or at PIN’s 51 and 11 of
the PCM Blue connector (See diagram).
Known Issue: The Tech-Assist consultant
also mentioned that if DTCs P0327 and P0332 are set at the same
time, inspect for poor connections at the two-wire knock sensor
harness, located at the left rear side of the intake manifold
near the top, just under the cover.
TIP:Always check resistance of the knock sensors
including the harness before reinstalling the intake manifold.
Confirmed Repair: When the technician
tested the resistance, he found that the circuit was 70 ohms over
specifications. The harness wires tested good, so he replaced
knock sensors again; this time with factory parts. He cleared the
DTCs and went for a test drive. The problem is fixed.