Mitsubishi Galant. Manual - part 253
MULTIPORT FUEL INJECTION(MFI) DIAGNOSIS
TSB Revision
MULTIPORT FUEL INJECTION (MFI) <3.0L>
13B-237
CIRCUIT OPERATION
•
The knock sensor sends a signal voltage to the
PCM (terminal 90).
TECHNICAL DESCRIPTION
•
The knock sensor converts the vibration of the
cylinder block into a voltage and outputs it. If
there is a malfunction of the knock sensor, the
voltage output will not change.
•
The PCM checks whether the voltage output
changes.
DTC SET CONDITIONS
Check Conditions
•
Ignition switch: ON
•
60 seconds or more have passed after the
ignition switch was turned on or the starting
sequence was completed.
•
Engine speed is higher than 3,000 r/min.
Judgment Criteria
•
Knock sensor output voltage (knock sensor peak
voltage in each 1/3 turn of the crankshaft) has not
changed more than 0.06 V in the last consecutive
200 periods.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are:)
•
Knock sensor failed.
•
Open or shorted knock sensor circuit, or loose
connector.
•
PCM failed.
DIAGNOSIS
Required Special Tools
MB991502: Scan Tool (MUT-II)
STEP 1 Check connector B-32 at the knock sensor for
damage.
Q: Is the connector in good condition?
YES : Go to Step 2.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection (
). Then go to Step 6.
AK000100
CONNECTOR:B-32
KNOCK SENSOR
AE
AK000280
CONNECTOR : C-41
PCM
AY
AK000100
CONNECTOR:B-32
KNOCK SENSOR
AE