P0340-CAMSHAFT POSITION SENSOR CIRCUIT
For a complete wiring diagram Refer to Section 8W.
- When Monitored:
During engine cranking and with the engine running. Battery voltage greater than 10 volts.
- Set Condition:
At least 5 seconds or 2.5 engine revolutions have elapsed with crankshaft position sensor signals present but no camshaft position sensor signal. One Trip Fault. Three good trips to turn off the MIL.
| Possible Causes |
| (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE |
| (F856) 5-VOLT SUPPLY CIRCUIT OPEN |
| (F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND |
| (K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE |
| (K44) CMP SIGNAL CIRCUIT OPEN |
| (K44) CMP SIGNAL CIRCUIT SHORTED GROUND |
| (K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT |
| (K900) SENSOR GROUND CIRCUIT OPEN |
| CAMSHAFT POSITION SENSOR |
| CRANKSHAFT POSITION SENSOR |
| PCM |
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING).
Diagnostic Test
1.ACTIVE DTCIs the DTC Active at this time?
Yes
- Go To 2
No
- Go To 14
2.(F856) 5-VOLT SUPPLY CIRCUIT
Is the voltage between 4.5 and 5.2 volts?
Yes
- Go To 3
No
- Go To 10
3.(K44) CMP SIGNAL CIRCUIT
Is the voltage between 4.5 and 5.0 volts?
Yes
- Go To 4
No
- Go To 7
4.(K900) SENSOR GROUND CIRCUIT OPEN
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.
Is the resistance below 5.0 ohms?
Yes
- Go To 5
No
- Repair the open in the (K900) Sensor ground circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
5.(K44) CMP SIGNAL CIRCUIT SHORTED TO THE (F856) 5-VOLT SUPPLY CIRCUIT
Is the resistance below 5.0 ohms?
Yes
- Repair the short between the (K44) CMP Signal circuit and the (F856) 5-volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 6
6.CAMSHAFT POSITION SENSOR
NOTE: Inspect the Camshaft sprocket for damage per the Service Information. If a problem is found repair as necessary.
If there are no possible causes remaining, view repair.
Repair
- Replace the Camshaft Position Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
7.(K44) CMP SIGNAL CIRCUIT SHORTED TO BATTERY VOLTAGE
Is the voltage above 0 volts?
Yes
- Repair the short to battery voltage in the (K44) CMP Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 8
8.(K44) CMP SIGNAL CIRCUIT OPEN
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.
Is the resistance below 5.0 ohms?
Yes
- Go To 9
No
- Repair the open in the (K44) CMP Signal circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
9.(K44) CMP SIGNAL CIRCUIT SHORTED TO GROUND
Is the resistance below 100 ohms?
Yes
- Repair the short to ground in the (K44) CMP Signal circuit
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 10
10.(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO BATTERY VOLTAGE
Is the voltage above 0 volts?
Yes
- Repair the short to battery voltage in the (F856) 5-volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 11
11.(F856) 5-VOLT SUPPLY CIRCUIT OPEN
CAUTION: Do not probe the PCM harness connectors. Probing the PCM harness connectors will damage the PCM terminals resulting in poor terminal to pin connection. Install Miller Special Tool #8815 to perform diagnosis.
Is the resistance below 5.0 ohms?
Yes
- Go To 12
No
- Repair the open in the (F856) 5-volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
12.(F856) 5-VOLT SUPPLY CIRCUIT SHORTED TO GROUND
Is the resistance below 100 ohms?
Yes
- Repair the short to ground in the (F856) 5-volt Supply circuit.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 13
13.PCM
NOTE: Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary.
Were there any problems found?
Yes
- Repair as necessary.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Replace and program the Powertrain Control Module per Service Information.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
14.ERRATIC CMP SIGNAL
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.
Did the CMP Sensor generate any erratic pulses?
Yes
- Replace the Camshaft Position Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Go To 15
15.ERRATIC CKP SIGNAL
WARNING: When the engine is operating, do not stand in direct line with the fan. Do not put your hands near the pulleys, belts, or fan. Do not wear loose clothing. Failure to follow these instructions can result in personal injury or death.
Did the CKP Sensor generate any erratic pulses?
Yes
- Replace the Crankshaft Position Sensor.
- Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE)
No
- Test complete, the conditions that set this DTC are not present at this time