DTC P0325 Knock Sensor Module
Performance
Circuit
Description
The KS system monitors
both knock sensors in order to determine if detonation is present. If the KS
system determines that excessive knock (detonation) is present, the PCM retards
the spark timing based on the signals from the KS system. When knock is
present, the KS system voltage input signal to the PCM goes low. The PCM then
retards timing until no knock is present. When the KS system is malfunctioning,
the KS circuit voltage going to the PCM goes low. The PCM interprets this low
signal as spark knock.
Conditions
for Running the DTC
- The engine speed is between
1,500 RPM and 3,000 RPM.
- The MAP is less than 60 kPa.
- The engine coolant temperature is
greater than 70°C (158°F).
- The throttle angle is greater than
0.5%.
- The engine run time is greater than
20 seconds.
Conditions
for Setting the DTC
- A malfunction with
the KS system or circuits within the PCM are faulty.
- All above conditions present for 3.0
seconds.
Action
Taken When the DTC Sets
- The PCM illuminates the malfunction
indicator lamp (MIL) on the second consecutive ignition cycle that the
diagnostic runs and fails.
- The PCM records the operating
conditions at the time the diagnostic fails. The first time the diagnostic
fails, the PCM stores this information in the Failure Records. If the
diagnostic reports a failure on the second consecutive ignition cycle, the
PCM records the operating conditions at the time of the failure. The PCM
writes the conditions to the Freeze Frame and updates the Failure Records.
Conditions
for Clearing the MIL/DTC
- The PCM turns OFF the malfunction
indicator lamp (MIL) after 3 consecutive ignition cycles that the
diagnostic runs and does not fail.
- A last test failed, or current DTC,
clears when the diagnostic runs and does not fail.
- A history DTC clears after
40 consecutive warm-up cycles, if no failures are reported by this or
any other emission related diagnostic.
- Use a scan tool in order to clear
the MIL and the DTC.
Diagnostic
Aids
- If the diagnostic test does not run,
review the Conditions for Running the DTC.
- For an intermittent condition, refer
to Symptoms
.
Test
Description
The numbers below refer
to the step numbers on the diagnostic table.
- This DTC indicates
an internal PCM condition.
|
Step
|
Action
|
Value(s)
|
Yes
|
No
|
|
1
|
Did
you perform the Powertrain On-Board Diagnostic
(OBD) System Check?
|
--
|
Go
to Step 2
|
Go to A
Powertrain On Board Diagnostic (OBD) System Check
|
|
2
|
Important:
Program the replacement
PCM. Refer to PCM
Replacement/Programming .
Replace
the PCM. Is the action complete?
|
--
|
Go
to Step 3
|
--
|
|
3
|
- Select the Diagnostic Trouble Code
(DTC) option and the Clear DTC option using the scan tool.
- Idle the engine at the normal
operating temperature.
- Select the Diagnostic Trouble Code
(DTC) option and the Specific DTC option, then
enter the DTC number using the scan tool.
- Operate vehicle within the
Conditions for Running the DTC as specified in the supporting text, if
applicable.
Does
the scan tool indicate that this test ran and passed?
|
--
|
Go
to Step 4
|
Go
to Step 2
|
|
4
|
Select
the Capture Info option and the Review Info option using the scan tool. Does
the scan tool display any DTCs that you have not diagnosed?
|
--
|
Go to applicable DTC
table
|
System OK
|