CAUTION: If ECM replacement is instructed in following testing, always ensure ECM connectors and ground circuit are okay. If either are suspect, repair and repeat
testing to confirm ECM malfunction.
The CMP sensor is a pick up coil mounted on left side of cylinder head. A 1 tooth signal plate is mounted on intake camshaft. DTC is set when either no cranking or engine running signal is received by ECM from
sensor. Possible causes are: ? Open or short in CMP sensor circuit.
? CMP sensor.
Diagnosis & Repair
1. Disconnect CMP sensor connector. Using ohmmeter, measure resistance between CMP sensor connector terminals. Resistance should be 835 1400 ohms (cold sensor) or 1060 1645 ohms (hot sensor).
2. Replace CMP sensor as necessary. If CMP sensor is okay, check for open or short circuit in wiring harness between ECM and CMP sensor. See appropriate wiring diagram in WIRING DIAGRAMS article.
Repair wiring as necessary.
3. If wiring harness is okay, remove and inspect CMP sensor. Also inspect signal plate. Replace CMP sensor and/or signal plate as necessary. If both components are okay, replace ECM.
First verify the timing belt is on correctly, then you need to have a proper diagnosis done for the 340 code.
A code never identifies bad parts, just failed systems