Description

DATA TROUBLE CODE: 52

SYSTEM: Knock Sensor Circuit

WIRING DIAGRAM

KNK Sensor Circuit:

CIRCUIT DESCRIPTION




Knock sensor is fitted the cylinder block to detect engine knocking. This sensor contains a piezoelectric element which generates a voltage when it becomes deformed, which occurs when the cylinder block vibrates due to knocking. If engine knocking occurs, ignition timing is retarded to suppress it.

DIAGNOSTIC TROUBLE CODE DETECTING CONDITION
- Open or short in knock sensor circuit with engine speed between 1,200 rpm and 6,000 rpm.
NOTE: If the engine control module (ECM) detects the diagnosis condition listed above, it operates the fail safe function in which the corrective retard angle value is set to the maximum value.

TROUBLE AREA
- Open or short in knock sensor circuit.
- Knock sensor (looseness)
- ECM

DIAGNOSTIC TROUBLE CODE DETECTION DRIVING PATTERN
Malfunction: Open or Short in Knock Sensor
Purpose of the driving pattern.
(a) To simulate diagnostic trouble code detecting condition after diagnostic trouble code is recorded.
(b) To check that the malfunction is corrected when the repair is completed confirming that diagnostic trouble code is no longer detected.

Driving Detection Pattern For DTC 52:

1. Start engine and warm up.
2. After engine is warmed up, let it idle for 3 min.
3. With the A/C ON, perform quick racing (5,000 rpm) 3 times. (Rapidly depress the accelerator pedal and suddenly release it.)
HINT: If a malfunction exists, the Malfunction Indicator Lamp ("CHECK" engine light) will light up when sudden racing is performed.
NOTE: If the conditions in this test are not strictly followed, detection of the malfunction will not be possible.