Dtc P0340 (Flash Code 14) - Isuzu N 2008 Series Workshop Manual

DTC P0340 (Flash Code 14)

Circuit Description
The camshaft position (CMP) sensor is installed on the
timing chain sprocket cover at the front of the camshaft
idle gear. The CMP sensor detects total of five
projections per one engine cycle (four projections
arranged equally every 90° and one reference
projection on the timing chain sprocket surface). The
CMP sensor is a magnetic resistance element (MRE)
type sensor, which generates a square wave signal
pulse. The sensor has the following circuits.
• 5 volts reference circuit
• Low reference circuit
• CMP sensor signal circuit
The ECM monitors both crankshaft position (CKP)
sensor and CMP sensor signal pulses to ensure they
correlate with each other. If the ECM receives a certain
amount of CKP sensor signal pulses without a CMP
sensor signal pulse, this DTC will set.
Condition for Running the DTC
• DTCs P0016, P0335, P0336 and P0341 are not
set.
• The ignition switch is ON.
• The CKP sensor signal pulse is detected.
Condition for Setting the DTC
• The ECM detects that the CMP sensor signal
pulses are not generated during engine rotations.
Circuit/ System Testing DTC P0340
Step
Did you perform the Diagnostic System Check -
1 Engine Controls?
1. Install a scan tool.
2. Turn OFF the ignition for 30 seconds.
3. Start the engine. If the engine does not start,
2
crank over the engine for 10 seconds.
4. Monitor the DTC Information with a scan tool.
Does the DTC fail this ignition?
3 Is DTC P0651 also set?
1. Turn OFF the ignition.
2. Disconnect the camshaft position (CMP)
sensor harness connector.
3. Connect a DMM between the 5 volts reference
4
circuit (pin 3 of E18) and a known good
ground.
4. Turn ON the ignition, with the engine OFF.
Is the DMM voltage more than the specified value?
Connect a DMM between the signal circuit (pin 1 of
E18) and a known good ground.
5
Is the DMM voltage more than the specified value?
Action
Engine Control System (4JJ1)
Action Taken When the DTC Sets
• The ECM illuminates the MIL when the diagnostic
runs and fails. Refer to DTC Type Definitions for
Action Taken When the DTC Sets - Type A.
Condition for Clearing the DTC
• Refer to DTC Type Definitions for Condition for
Clearing the MIL/ DTC - Type A.
Diagnostic Aids
• If an intermittent condition is suspected, refer to
Intermittent Conditions in this section.
• Electromagnetic interference in the CMP sensor
circuits may set this DTC.
• An intermittent CMP sensor signal pulse may set
this DTC.
• Ensure the sensor is tight and the timing chain
sprocket is not damaged.
Notice: If the CMP sensor signal pulse is lost while
running, the engine will operate normally. If the CMP
sensor signal pulse is not present on start-up, the
engine will not start.
Connector End View Reference: Engine Controls
Connector End Views or ECM Connector End Views
Value(s) Yes
—
Go to Step 2
—
Go to Step 3
— Go to DTC P0651
4.5 volts
Go to Step 5
5.5 volts
Go to Step 12
1A-145
No
Go to Diagnostic
System Check -
Engine Controls
Go to Diagnostic
Aids
Go to Step 4
Go to Step 9
Go to Step 6