Mitsubishi Montero (2002-2004). Manual — part 666
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-361
.
CIRCUIT OPERATION
• The crankshaft position sensor power is supplied
from the MFI relay (terminal No. 1).
• Terminal No. 1 of the crankshaft position sensor
is grounded with PCM (terminal No. 88).
• A 5-volt voltage is applied on the crankshaft posi-
tion sensor output terminal (terminal No. 2) from
the PCM (terminal No. 70). The crankshaft posi-
tion sensor generates a pulse signal when the
output terminal is opened and grounded.
.
TECHNICAL DESCRIPTION
• The crankshaft position sensor detects the crank
angle (position) of each cylinder, and converts
that data to pulse signals, which are then input to
the PCM.
• When the engine is running, the crankshaft posi-
tion sensor outputs a pulse signal.
• The PCM checks whether pulse signal is input
while the engine is cranking.
.
DTC SET CONDITIONS
Check Conditions
• Engine is being cranked.
Judgment Criteria
• Crankshaft position sensor output voltage has not
changed (no pulse signal is input) for 2 seconds.
Check Conditions, Judgment Criteria
• Normal signal pattern has not been input for cyl-
inder identification from the crankshaft position
sensor signal and camshaft position sensor sig-
nal for 2 seconds.
.
TROUBLESHOOTING HINTS (The most likely
causes for this code to be set are: )
• Crankshaft position sensor failed.
• Open or shorted crankshaft position sensor cir-
cuit, or loose connector.
• PCM failed.
AK201057AB
CONNECTOR: B-36
B-36(B)
CRANKSHAFT
POSITION
SENSOR
AK201038
CONNECTOR: D-134
AD
PCM
D-134(GR)
AK201039
MFI RELAY
B-22X
AB
CONNECTOR: B-22X
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-362
DIAGNOSIS
Required Special Tools:
• MB991502: Scan Tool (MUT-II)
• MD998478: Test Harness (3pin, triangle)
STEP 1. Using scan tool MB991502, check data list item 22:
Crankshaft Position Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Start the engine and run at idle.
(3) Set scan tool MB991502 to the data reading mode for item
22, Crankshaft Position Sensor.
• The tachometer and engine speed indicated on the scan
tool should much.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to IN GROUP 00, How to Use Troubleshooting/
Inspection Service Points
NO : Go to Step 2.
ACX01539
16-PIN
MB991502
AC
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-363
STEP 2. Using the oscilloscope, check the crankshaft
position sensor.
(1) Disconnect the crankshaft position sensor connector, and
connect the test harness special tool (MD998478) in
between.
(2) Connect the oscilloscope probe to crankshaft position
sensor connector terminal No. 2 (bank clip of special tool).
NOTE: Connect the oscilloscope plobe to terminal No. 45
by backprobing when measuring with the PCM connector.
(3) Start the engine and run at idle.
(4) Check the waveform.
• The waveform should show a pattern similar to the illus-
tration.
(5) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the waveform normal?
YES : Go to Step 3.
NO : Go to Step 5.
AK200962
1
2
3
AB
CONNECTOR: B-36
B-36(B)
CRANKSHAFT
POSITION
SENSOR
HARNESS
CONNECTOR:
COMPONENT SIDE
AK102979AB
MD998478
1 2
3
CRANKSHAFT POSITION
SENSOR CONNECTOR
OSCILLOSCOPE
AKX01559AB
NORMAL WAVEFORM
2 ENGINE REVOLUTIONS
5 V
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DIAGNOSTIC TROUBLE CODE PROCEDURES
13Ac-364
STEP 3. Check connector B-36 at the crankshaft position
sensor for damage.
Q: Is the connector in good condition?
YES : Go to Step 4.
NO : Repair or replace it. Refer to GROUP 00E, Harness
Connector Inspection
. Then go to Step 21.
STEP 4. Using scan tool MB991502, check data list item 22:
Crankshaft Position Sensor.
CAUTION
To prevent damage to scan tool MB991502, always turn the
ignition switch to the "LOCK" (OFF) position before con-
necting or disconnecting scan tool MB991502.
(1) Connect scan tool MB991502 to the data link connector.
(2) Turn the ignition switch to the "ON" position.
(3) Set scan tool MB991502 to the data reading mode for item
22, Crankshaft Position Sensor.
• The tachometer and engine speed indicated on the scan
tool should much.
(4) Turn the ignition switch to the "LOCK" (OFF) position.
Q: Is the sensor operating properly?
YES : It can be assumed that this malfunction is intermittent.
Refer to GROUP 00, How to Use Troubleshooting/
Inspection Service Points
NO : Replace the PCM. Then go to Step 21.
AK200962
1
2
3
AB
CONNECTOR: B-36
B-36(B)
CRANKSHAFT
POSITION
SENSOR
HARNESS
CONNECTOR:
COMPONENT SIDE
ACX01539
16-PIN
MB991502
AC
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