RM36D0EC _51 Engine / Hybrid System _087036 M20C-FKS ENGINE CONTROL _0418131 SFI SYSTEM C

M20C-FKS ENGINE CONTROL  SFI SYSTEM  P032511  Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground  


DESCRIPTION

A flat-type knock control sensor (non-resonant type) has a structure that can detect vibrations between approximately 5 and 23 kHz.

The knock control sensor is fitted onto the engine block to detect engine knocking.

The knock control sensor contains a piezoelectric element which generates a voltage when it becomes deformed.

The voltage is generated when the engine block vibrates due to knocking. Any occurrence of engine knocking can be suppressed by delaying the ignition timing.

HINT:

When DTC P032511 is stored, the ECM enters fail-safe mode. During fail-safe mode, the ignition timing is delayed to its maximum retardation. Fail-safe mode continues until the ignition switch turned off.


DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory Note
P032511 Knock Sensor 1 Bank 1 or Single Sensor Circuit Short to Ground The knock control sensor output voltage is less than 0.5 V for 1 second or more (1 trip detection logic).
·

Short in knock control sensor circuit

·

Knock control sensor

·

ECM


Comes on DTC stored SAE: P0327

Reference: Inspection using an oscilloscope

A283572E09
2.427,0.521 3.208,0.865 0.781,0.344 10 1 V/DIV. 2.615,1 3.115,1.292 0.5,0.292 10 GND 1.115,1.865 2.01,2.083 0.896,0.219 10 1 ms./DIV.

HINT:

The correct waveform is as shown.


ECM Terminal Name Between KNK1 and EKNK
Tester Range 1 V/DIV., 1 ms./DIV.
Condition Engine speed maintained at 4000 rpm after warming up engine

MONITOR DESCRIPTION

If the output voltage transmitted by the knock control sensor remains low for 1 second or more, the ECM interprets this as a malfunction in the sensor circuit, illuminates the MIL and stores this DTC.

MONITOR STRATEGY

Frequency of Operation Continuous

CONFIRMATION DRIVING PATTERN

HINT:
·

After repair has been completed, clear the DTC and then check that the vehicle has returned to normal by performing the following All Readiness check procedure.

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR

·

When clearing the permanent DTCs, refer to the "CLEAR PERMANENT DTC" procedure.

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>DTC CHECK / CLEAR



1.

Connect the GTS to the DLC3.

2.

Turn the ignition switch to ON.

3.

Turn the GTS on.

4.

Clear the DTCs (even if no DTCs are stored, perform the clear DTC procedure).

5.

Turn the ignition switch off and wait for at least 30 seconds.

6.

Start the engine and wait 5 minutes [A].

7.

Turn the GTS on.

8.

Enter the following menus: Powertrain / Engine / Trouble Codes [B].

9.

Read the pending DTCs.

HINT:
·

If a pending DTC is output, the system is malfunctioning.

·

If a pending DTC is not output, perform the following procedure.



10.

Enter the following menus: Powertrain / Engine / Utility / All Readiness.

11.

Input the DTC: P032511.

12.

Check the DTC judgment result.

GTS Display Description
NORMAL
·

DTC judgment completed

·

System normal


ABNORMAL
·

DTC judgment completed

·

System abnormal


INCOMPLETE
·

DTC judgment not completed

·

Perform driving pattern after confirming DTC enabling conditions



HINT:
·

If the judgment result is NORMAL, the system is normal.

·

If the judgment result is ABNORMAL, the system is malfunctioning.

·

If the judgment result is INCOMPLETE, idle the engine for 5 minutes and check the DTC judgment result again.

·

[A] to [B]: Normal judgment procedure.

The normal judgment procedure is used to complete DTC judgment and also used when clearing permanent DTCs.

·

When clearing the permanent DTCs, do not disconnect the cable from the battery terminal or attempt to clear the DTCs during this procedure, as doing so will clear the universal trip and normal judgment histories.




WIRING DIAGRAM

A452297E05
1.208,1.823 2.594,2 1.385,0.177 10 false Knock Control Sensor 3.563,2.479 4.229,2.667 0.667,0.188 10 false (Shielded) 5.969,3.344 6.313,3.51 0.344,0.167 10 false ECM 5.49,1.115 5.885,1.281 0.396,0.167 10 false KNK1 5.49,1.938 5.906,2.104 0.417,0.167 10 false EKNK 5.146,1.135 5.729,1.458 0.583,0.323 10 false 155 5.156,1.948 5.792,2.198 0.635,0.25 10 false 156 1.208,1.635 1.729,1.969 0.521,0.333 10 false F3 1.01,1.094 1.188,1.281 0.177,0.188 10 false 1 2.698,1.115 2.802,1.281 0.104,0.167 10 false 2 5.594,3.344 6.063,3.531 0.469,0.188 10 false C71 6.219,0.719 6.802,1.042 0.583,0.323 10 false 5 V 1.198,1.094 1.813,1.292 0.615,0.198 10 false EKNK 2.219,1.094 2.833,1.292 0.615,0.198 10 false KNK1

CAUTION / NOTICE / HINT

HINT:

Read Freeze Frame Data using the GTS. The ECM records vehicle and driving condition information as Freeze Frame Data the moment a DTC is stored. When troubleshooting, Freeze Frame Data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.


PROCEDURE

1.CHECK TERMINAL VOLTAGE (POWER SOURCE OF KNOCK CONTROL SENSOR)
A402438C40
0.229,0.865 0.625,1.104 0.396,0.24 1.042,1.74 1.604,1.115 true 2.688,1.729 2.156,1.115 true 0.365,0.896 0.677,1.094 0.313,0.198 10 false F3 0.198,0.135 0.51,0.333 0.313,0.198 10 false *a 0.729,1.771 1.344,1.969 0.615,0.198 10 false EKNK 2.615,1.771 3.229,1.969 0.615,0.198 10 false KNK1
*a Front view of wire harness connector
(to Knock Control Sensor)


a.

Disconnect the knock control sensor connector.


b.

Turn the ignition switch to ON.


c.

Measure the voltage according to the value(s) in the table below.

Standard Voltage:
Tester Connection Switch Condition Specified Condition
F3-2 (KNK1) - F3-1 (EKNK) Ignition switch ON 4.5 to 5.5 V



Result:
Proceed to
OK
NG



OK

2.INSPECT KNOCK CONTROL SENSOR

NG

3.CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)
3.CHECK HARNESS AND CONNECTOR (KNOCK CONTROL SENSOR - ECM)
a.

Disconnect the knock control sensor connector.


b.

Disconnect the ECM connector.


c.

Measure the resistance according to the value(s) in the table below.

Standard Resistance:
Tester Connection Condition Specified Condition
F3-2 (KNK1) or C71-155 (KNK1) - Body ground Always 10 kΩ or higher



Result:
Proceed to
OK
NG



OK

4.CLEAR DTC

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.CLEAR DTC
a.

Connect the GTS to the DLC3.


b.

Turn the ignition switch to ON.


c.

Turn the GTS on.


d.

Clear the DTCs.

Powertrain > Engine > Clear DTCs
50002 372

e.

Turn the ignition switch off and wait for at least 30 seconds.


Result:
Proceed to
NEXT



NEXT

5.CHECK WHETHER DTC OUTPUT RECURS (DTC P032511)
5.CHECK WHETHER DTC OUTPUT RECURS (DTC P032511)
a.

Drive the vehicle in accordance with the driving pattern described in Confirmation Driving Pattern.


b.

Enter the following menus: Powertrain / Engine / Trouble Codes.


c.

Read the DTCs.

Powertrain > Engine > Trouble Codes
50001 372
Result:
Result Proceed to
DTCs are not output A
DTC P032511 is output B




A

CHECK FOR INTERMITTENT PROBLEMS

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>SFI SYSTEM>CHECK FOR INTERMITTENT PROBLEMS


B

REPLACE ECM

Click hereEngine / Hybrid System>M20C-FKS (ENGINE CONTROL)>ECM>REMOVAL