'04 CEL - P0340 Generic Camshaft Position - Advice Required
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Honda-Tech Member
Joined: Oct 2008
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From: Markham, Ont, Canada
'04 CEL - P0340 Generic Camshaft Position - Advice Required
Hey Guys,
Got a CEL question here ….
My wife’s 2004 Honda Civic Si (EX in the USA) recently tripped a CEL. I scanned the system last night and the code that came back was “P0340 – Generic Camshaft Position Sensor A – Bank 1 Circuit Malfunction”
I’m curious on what my next steps would be to trouble shoot this CEL?
I’m assuming there’s an issue with the Camshaft Position Sensor but the car still runs 100% and we don’t see any issues with its drivability? If this sensor failed, wouldn’t the car not run / run properly?
Where is this sensor located and how easy is it to get access to if it needed to be tested / changed?
Anyone know the OEM part number for this sensor??
Thanks in advance for the help guys
Got a CEL question here ….
My wife’s 2004 Honda Civic Si (EX in the USA) recently tripped a CEL. I scanned the system last night and the code that came back was “P0340 – Generic Camshaft Position Sensor A – Bank 1 Circuit Malfunction”
I’m curious on what my next steps would be to trouble shoot this CEL?
I’m assuming there’s an issue with the Camshaft Position Sensor but the car still runs 100% and we don’t see any issues with its drivability? If this sensor failed, wouldn’t the car not run / run properly?
Where is this sensor located and how easy is it to get access to if it needed to be tested / changed?
Anyone know the OEM part number for this sensor??
Thanks in advance for the help guys
B*a*n*n*e*d
Joined: Sep 2007
Posts: 7,457
Likes: 15
Re: '04 CEL - P0340 Generic Camshaft Position - Advice Required
Have you tried resetting the PCM (ecu) to see if the MIL comes back on with the same code? It's worth a shot. Drive the car around until it's at normal operating temp, then do the following.
Remove fuse #6 from the fuse/relay box in the engine compartment. Wait about 30 seconds before reinstalling it. Then start the car and let it idle for at least five minutes.
Does the MIL come back on with the same code? If so, one of our members (lazlong) has posted a troubleshooting summary for DTC P0340. Click here for that.
OEM part number for the sensor is 37840-RJH-006, as seen here.
The sensor is located on the side of the cylinder head. In order to access it, you will first need to remove the valve cover. This requires disconnecting and removing the coil packs, harness holder for the coil packs, etc. Then pull the rubber grommet back and disconnect the harness from the sensor. Remove the upper timing belt cover and you will then have access to the sensor.
The torque spec for the sensor bolts is 7.2 lbs. Same with the timing belt cover bolts, valve cover bolts, harness holder, etc. etc. The coil packs require 8.7 lbs of torque.
Remove fuse #6 from the fuse/relay box in the engine compartment. Wait about 30 seconds before reinstalling it. Then start the car and let it idle for at least five minutes.
Does the MIL come back on with the same code? If so, one of our members (lazlong) has posted a troubleshooting summary for DTC P0340. Click here for that.
OEM part number for the sensor is 37840-RJH-006, as seen here.
The sensor is located on the side of the cylinder head. In order to access it, you will first need to remove the valve cover. This requires disconnecting and removing the coil packs, harness holder for the coil packs, etc. Then pull the rubber grommet back and disconnect the harness from the sensor. Remove the upper timing belt cover and you will then have access to the sensor.
The torque spec for the sensor bolts is 7.2 lbs. Same with the timing belt cover bolts, valve cover bolts, harness holder, etc. etc. The coil packs require 8.7 lbs of torque.
Honda-Tech Member
Joined: Jan 2009
Posts: 419
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From: VA
Re: '04 CEL - P0340 Generic Camshaft Position - Advice Required
1. With the ignition OFF, disconnect the CMP sensor (cam sensor).
2. With the ignition ON (II), measure voltage from the yellow/black wire on the harness side of the connector to body ground.
Is there battery voltage?
YES- step 3
NO- Repair the open in the wire between PGM-FI main relay and the CMP sensor
3. Measure voltage from the green wire on the harness side to body ground
Is there about 5V ?
YES- step 4
NO- step 6
4. Measure voltage between the yellow/black and brown/yellow wires on the harness side
Is there battery voltage?
YES- step 5
NO- Repair open in the wire between the CMP sensor and G101. G101 is the ground running from the engine to the radiator support.
5. Replace with a new sensor.
2. With the ignition ON (II), measure voltage from the yellow/black wire on the harness side of the connector to body ground.
Is there battery voltage?
YES- step 3
NO- Repair the open in the wire between PGM-FI main relay and the CMP sensor
3. Measure voltage from the green wire on the harness side to body ground
Is there about 5V ?
YES- step 4
NO- step 6
4. Measure voltage between the yellow/black and brown/yellow wires on the harness side
Is there battery voltage?
YES- step 5
NO- Repair open in the wire between the CMP sensor and G101. G101 is the ground running from the engine to the radiator support.
5. Replace with a new sensor.
I hate to throw just parts, want to properly diagnose the problem. Also, is there any recommendation for the sensor? Thanks for any help and advice.
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