DTC P0340: CMP Sensor A No Signal

NOTE: Before you troubleshoot, record all freeze data and any on-board snapshot, and review the general troubleshooting information (see GENERAL TROUBLESHOOTING INFORMATION )

Turn the ignition switch to ON (II)
Clear the DTC with the HDS
Start the engine
Check for Temporary DTCs or DTCs with the HDS
Is DTC P0340 indicated?

YES -Go to step 5

NO -Intermittent failure, the system is OK at this time Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM
Turn the ignition switch to LOCK (0)
Disconnect the CMP sensor A 3P connector
Turn the ignition switch to ON (II)
Measure the voltage between CMP sensor A 3P connector terminal No 3 and body ground

Fig 1: Measuring Voltage Between CMP Sensor A 3P Connector Terminal No 3 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 9

NO -Repair open in the wire between CMP sensor A and the No 7 ACG (15 A) fuse, then go to step 18
Measure the voltage between CMP sensor A 3P connector terminal No 1 and body ground

Fig 2: Measuring Voltage Between CMP Sensor A 3P Connector Terminal No 1 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there about 5 V?

YES -Go to step 10

NO -Go to step 11
Measure the voltage between CMP sensor A 3P connector terminals No 2 and No 3

Fig 3: Measuring Voltage Between CMP Sensor A 3P Connector Terminals No 2 And No 3
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there battery voltage?

YES -Go to step 16

NO -Repair open in the wire between CMP sensor A and G101 (see ENGINE WIRE HARNESS (A/T) ), then go to step 18
Turn the ignition switch to LOCK (0)
Jump the SCS line with the HDS
Disconnect ECM/PCM connector C (49P)
Check for continuity between ECM/PCM connector terminal C45 and body ground

Fig 4: Checking Continuity Between ECM/PCM Connector Terminal C45 And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Repair short in the wire between the ECM/PCM (C45) and CMP sensor A, then go to step 18

NO -Go to step 15
Check for continuity between CMP sensor A 3P connector terminal No 1 and ECM/PCM connector terminal C45

Fig 5: Checking Continuity Between CMP Sensor A 3P Connector Terminal No 1 And ECM/PCM Connector Terminal C45
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES -Go to step 23

NO -Repair open in the wire between the ECM/PCM (C45) and CMP sensor A, then go to step 18
Turn the ignition switch to LOCK (0)
Replace CMP sensor A (see CMP SENSOR A REPLACEMENT )
Reconnect all connectors
Turn the ignition switch to ON (II)
Reset the ECM/PCM with the HDS
Do the ECM/PCM idle learn procedure (see ECM/PCM IDLE LEARN PROCEDURE )
Check for Temporary DTCs or DTCs with the HDS
Is DTC P0340 indicated?

YES -Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM, then go to step 1

NO -Troubleshooting is complete If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting
Reconnect all connectors
Update the ECM/PCM if it does not have the latest software (see ECM/PCM UPDATE ), or substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM )
Check for Temporary DTCs or DTCs with the HDS
Is DTC P0340 indicated?

YES -Check for poor connections or loose terminals at CMP sensor A and the ECM/PCM If the ECM/PCM was updated, substitute a known-good ECM/PCM (see SUBSTITUTING THE ECM/PCM ), then recheck If the ECM/PCM was substituted, go to step 1

NO -If the ECM/PCM was updated, troubleshooting is complete If the ECM/PCM was substituted, replace the original ECM/PCM (see ECM/PCM REPLACEMENT ) If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC's troubleshooting